More extra data

src/main/java/org/pasteque/common/datasource/AssociationInconsistencyException.java

@@ -5,7 +5,7 @@ package org.pasteque.common.datasource;
  */
 public class AssociationInconsistencyException extends Exception
 {
-    private static final long serialVersionUID = -979786104345156783L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getFromField()} */
     private final String fromField;

src/main/java/org/pasteque/common/datatransfer/dto/APIVersionDTO.java

@@ -16,7 +16,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class APIVersionDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 4654741357430549138L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getLevel()} */
     private final int level;

src/main/java/org/pasteque/common/datatransfer/dto/CategoryDTO.java

@@ -10,7 +10,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class CategoryDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = 8211717550217795453L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getParent} */
     private final Integer parent;

src/main/java/org/pasteque/common/datatransfer/dto/CompositionDTO.java

@@ -10,7 +10,7 @@ import org.pasteque.coreutil.ImmutableList;
  */
 public class CompositionDTO extends ProductDTO implements Serializable
 {
-    private static final long serialVersionUID = -3223110713928387147L;
+    private static final long serialVersionUID = 1L;
 
     /** Always true */
     protected final boolean composition = true;
@@ -92,7 +92,7 @@ public class CompositionDTO extends ProductDTO implements Serializable
      */
     public class CompositionGroupDTO implements Serializable
     {
-        private static final long serialVersionUID = -5237752185922817170L;
+        private static final long serialVersionUID = 1L;
 
         /** {@see getLabel()} */
         private final String label;
@@ -144,7 +144,7 @@ public class CompositionDTO extends ProductDTO implements Serializable
      */
     public class CompositionProductDTO implements Serializable
     {
-        private static final long serialVersionUID = 4024627602322411550L;
+        private static final long serialVersionUID = 1L;
 
         /** {@see getProduct()} */
         private final int product;

src/main/java/org/pasteque/common/datatransfer/dto/CurrencyDTO.java

@@ -11,7 +11,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class CurrencyDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = -6259735426241774167L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getSymbol()} */
     private final String symbol;

src/main/java/org/pasteque/common/datatransfer/dto/CustomerDTO.java

@@ -16,7 +16,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class CustomerDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = 2904701878615495822L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getCard()} */
     private final String card;

src/main/java/org/pasteque/common/datatransfer/dto/DiscountProfileDTO.java

@@ -14,7 +14,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class DiscountProfileDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = -2505636588019239236L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getDiscountRate()}. */
     private final double discountRate;

src/main/java/org/pasteque/common/datatransfer/dto/FloorDTO.java

@@ -12,7 +12,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class FloorDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = -4474106026709243994L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getPlaces()} */
     private final ImmutableList<PlaceDTO> places;
@@ -71,7 +71,7 @@ public class FloorDTO extends CommonDTO implements Serializable
      */
     public class PlaceDTO implements Serializable
     {
-        private static final long serialVersionUID = 8129968704161611106L;
+        private static final long serialVersionUID = 1L;
 
         /** {@see getLabel()} */
         private final String label;

src/main/java/org/pasteque/common/datatransfer/dto/ImageDTO.java

@@ -20,7 +20,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class ImageDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = -7807272808383007554L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getModel()} */
     private final String model;

src/main/java/org/pasteque/common/datatransfer/dto/OptionDTO.java

@@ -16,7 +16,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class OptionDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 8951727299457218490L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getName()} */
     private final String name;

src/main/java/org/pasteque/common/datatransfer/dto/OrderDTO.java

@@ -15,7 +15,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class OrderDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = -3898628758749878634L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getId()}. */
     private final String id;
@@ -194,7 +194,7 @@ public class OrderDTO implements DTOInterface, Serializable
      */
     public class OrderLineDTO implements Serializable
     {
-        private static final long serialVersionUID = 8802466032089572015L;
+        private static final long serialVersionUID = 1L;
 
         /** See {@link getDispOrder()}. */
         private final int dispOrder;

src/main/java/org/pasteque/common/datatransfer/dto/PaymentModeDTO.java

@@ -17,7 +17,7 @@ import org.pasteque.coreutil.ImmutableList;
  */
 public class PaymentModeDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = 5324960228614648256L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getBackLabel()} */
     private final String backLabel;
@@ -139,7 +139,7 @@ public class PaymentModeDTO extends CommonDTO implements Serializable
      */
     public class PaymentModeValueDTO implements Serializable
     {
-        private static final long serialVersionUID = 5503522521532600750L;
+        private static final long serialVersionUID = 1L;
 
         /** {@see getValue()} */
         private final double value;
@@ -195,7 +195,7 @@ public class PaymentModeDTO extends CommonDTO implements Serializable
      */
     public class PaymentModeReturnDTO implements Serializable
     {
-        private static final long serialVersionUID = -5076562956398887860L;
+        private static final long serialVersionUID = 1L;
 
         /** {@see getMinAmount()} */
         private double minAmount;

src/main/java/org/pasteque/common/datatransfer/dto/ProductDTO.java

@@ -9,7 +9,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class ProductDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = -6083885399091129846L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getBarcode()} */
     protected final String barcode;

src/main/java/org/pasteque/common/datatransfer/dto/ResourceDTO.java

@@ -22,7 +22,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class ResourceDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = -7746795788087018857L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getModel()} */
     private final String label;

src/main/java/org/pasteque/common/datatransfer/dto/RoleDTO.java

@@ -14,7 +14,7 @@ import org.pasteque.coreutil.ImmutableList;
  */
 public class RoleDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = 1835635017595972352L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getPermissions()} */
     private final ImmutableList<String> permissions;

src/main/java/org/pasteque/common/datatransfer/dto/TariffAreaDTO.java

@@ -12,7 +12,7 @@ import org.pasteque.coreutil.ImmutableList;
  */
 public class TariffAreaDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = -2639559615366931293L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getSymbol()} */
     private final ImmutableList<TariffAreaPriceDTO> prices;
@@ -70,7 +70,7 @@ public class TariffAreaDTO extends CommonDTO implements Serializable
      */
     public class TariffAreaPriceDTO implements Serializable
     {
-        private static final long serialVersionUID = 3384262202026051762L;
+        private static final long serialVersionUID = 1L;
 
         /** See {@link getProduct()}. */
         private int product;

src/main/java/org/pasteque/common/datatransfer/dto/TaxDTO.java

@@ -14,7 +14,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class TaxDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = 8232927221600250003L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getTaxRate()}. */
     private final double taxRate;

src/main/java/org/pasteque/common/datatransfer/dto/UserDTO.java

@@ -11,7 +11,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class UserDTO extends CommonDTO implements Serializable
 {
-    private static final long serialVersionUID = 5162729826784894378L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getRole()} */
     private final int role;

src/main/java/org/pasteque/coreutil/ImmutableList.java

@@ -15,7 +15,7 @@ import java.util.function.Consumer;
  */
 public final class ImmutableList<T> implements Iterable<T>, Serializable
 {
-    private static final long serialVersionUID = 4982637247874555568L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link get(int)} or {@link iterator()}. */
     private List<T> content;

src/main/java/org/pasteque/coreutil/ParseException.java

@@ -5,7 +5,7 @@ package org.pasteque.coreutil;
  */
 public class ParseException extends Exception
 {
-    private static final long serialVersionUID = 3552338953002779225L;
+    private static final long serialVersionUID = 1L;
 
     /**
      * Create a generic exception with only a message.

src/main/java/org/pasteque/coreutil/datatransfer/dto/CashRegisterDTO.java

@@ -8,6 +8,7 @@ import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.integrity.InvalidFieldException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityException;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Physical cash register hardware Data Transfer Object.</p>
@@ -15,30 +16,33 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class CashRegisterDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 1079581813013284003L;
+    private static final long serialVersionUID = 1L;
  
-    /** {@see getReference()} */
+    /** See {@link getReference()}. */
     private String reference;
-
+    /** See {@link getLabel()}. */
-    /** {@see getLabel()} */
     private String label;
- 
+    /** See {@link getNextTicketNumber()}. */
-    /** {@see getNextTicketNumber()} */
     private int nextTicketNumber;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create from all fields.
      * @param reference The unique reference.
      * @param label The display name.
      * @param nextTicketNumber See {@link getNextTicketNumber}.
+     * @param extra See {@link getExtra()}.
      */
     public CashRegisterDTO(
             String reference,
             String label,
-            int nextTicketNumber) {
+            int nextTicketNumber,
+            ExtraObject extra) {
         this.reference = reference;
         this.label = label;
         this.nextTicketNumber = nextTicketNumber;
+        this.extra = extra;
     }
 
     /**
@@ -51,6 +55,7 @@ public final class CashRegisterDTO implements DTOInterface, Serializable
         this.reference = reader.readString("reference");
         this.label = reader.readString("label");
         this.nextTicketNumber = reader.readInt("nextTicketId");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -78,6 +83,14 @@ public final class CashRegisterDTO implements DTOInterface, Serializable
         return nextTicketNumber;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     /**
      * Check if the reference and labels are set and nextTicketNumber is
      * positive or zero.

src/main/java/org/pasteque/coreutil/datatransfer/dto/CashSessionDTO.java

@@ -7,6 +7,7 @@ import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.DTOFactory;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Non finished cash session Data Transfer Object.</p>
@@ -17,7 +18,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class CashSessionDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 2312930086844551950L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getCashRegister()}. */
     private WeakAssociationDTO cashRegister;
@@ -31,6 +32,8 @@ public final class CashSessionDTO implements DTOInterface, Serializable
     private ImmutableList<MovementDTO> movements;
     /** See {@link getTickets()}. */
     private ImmutableList<FiscalTicketDTO> tickets;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create a cash session from all fields.
@@ -40,6 +43,7 @@ public final class CashSessionDTO implements DTOInterface, Serializable
      * @param openDate See {@link getOpenDate()}.
      * @param movements See {@link getMovements()}.
      * @param tickets See {@link getTickets()}.
+     * @param extra See {@link getExtra()}.
      */
     public CashSessionDTO(
             WeakAssociationDTO cashRegister,
@@ -47,13 +51,15 @@ public final class CashSessionDTO implements DTOInterface, Serializable
             boolean continuous,
             Date openDate,
             ImmutableList<MovementDTO> movements,
-            ImmutableList<FiscalTicketDTO> tickets) {
+            ImmutableList<FiscalTicketDTO> tickets,
+            ExtraObject extra) {
         this.cashRegister = cashRegister;
         this.sequence = sequence;
         this.continuous = continuous;
         this.openDate = openDate;
         this.movements = movements;
         this.tickets = tickets;
+        this.extra = extra;
     }
 
     /**
@@ -73,6 +79,7 @@ public final class CashSessionDTO implements DTOInterface, Serializable
         this.movements = mvtFacto.immutableReadObjects("movements");
         DTOFactory<FiscalTicketDTO> tktFacto = new DTOFactory<FiscalTicketDTO>(reader, FiscalTicketDTO.class);
         this.tickets = tktFacto.immutableReadObjects("tickets");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -131,6 +138,14 @@ public final class CashSessionDTO implements DTOInterface, Serializable
         return this.tickets;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub

src/main/java/org/pasteque/coreutil/datatransfer/dto/FiscalTicketDTO.java

@@ -30,7 +30,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class FiscalTicketDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 1622469748625149642L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getType()}. */
     private String type;

src/main/java/org/pasteque/coreutil/datatransfer/dto/MovementDTO.java

@@ -5,6 +5,7 @@ import java.util.Date;
 import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Change in currency amounts not introduced by the payment of a ticket.
@@ -16,7 +17,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class MovementDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 2409481140667639418L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getPaymentMode()}. */
     private WeakAssociationDTO paymentMode;
@@ -26,6 +27,8 @@ public final class MovementDTO implements DTOInterface, Serializable
     private double currencyAmount;
     /** See {@link getDate()}. */
     private Date date;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create a movement from all fields.
@@ -33,16 +36,19 @@ public final class MovementDTO implements DTOInterface, Serializable
      * @param currency See {@link getCurrency()}.
      * @param currencyAmount See {@link getCurrencyAmount()}.
      * @param date See {@link getDate()}.
+     * @param extra See {@link getExtra()}.
      */
     public MovementDTO(
             WeakAssociationDTO paymentMode,
             WeakAssociationDTO currency,
             double currencyAmount,
-            Date date) {
+            Date date,
+            ExtraObject extra) {
         this.paymentMode = paymentMode;
         this.currency = currency;
         this.currencyAmount = currencyAmount;
         this.date = date;
+        this.extra = extra;
     }
 
     /**
@@ -60,6 +66,7 @@ public final class MovementDTO implements DTOInterface, Serializable
         reader.endObject();
         this.currencyAmount = reader.readDouble("currencyAmount");
         this.date = reader.readDate("date");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -94,6 +101,14 @@ public final class MovementDTO implements DTOInterface, Serializable
         return this.date;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub

src/main/java/org/pasteque/coreutil/datatransfer/dto/PaymentDTO.java

@@ -4,6 +4,7 @@ import java.io.Serializable;
 import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Payment amount Data Transfer Object. A payment may refer to a single one
@@ -14,7 +15,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class PaymentDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 3195260108460565293L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getPaymentMode()}. */
     private WeakAssociationDTO paymentMode;
@@ -24,6 +25,8 @@ public final class PaymentDTO implements DTOInterface, Serializable
     private double amount;
     /** See {@link getCurrencyAmount()}. */
     private double currencyAmount;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create a payment from all fields.
@@ -31,16 +34,19 @@ public final class PaymentDTO implements DTOInterface, Serializable
      * @param amount See {@link getAmount()}.
      * @param currency See {@link getCurrency()}.
      * @param currencyAmount See {@link getCurrencyAmount()}.
+     * @param extra See {@link getExtra()}.
      */
     public PaymentDTO(
             WeakAssociationDTO paymentMode,
             double amount,
             WeakAssociationDTO currency,
-            double currencyAmount) {
+            double currencyAmount,
+            ExtraObject extra) {
         this.paymentMode = paymentMode;
         this.amount = amount;
         this.currency = currency;
         this.currencyAmount = currencyAmount;
+        this.extra = extra;
     }
 
     /**
@@ -58,6 +64,7 @@ public final class PaymentDTO implements DTOInterface, Serializable
         this.currency = new WeakAssociationDTO(reader);
         reader.endObject();
         this.currencyAmount = reader.readDouble("currencyAmount");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -92,6 +99,14 @@ public final class PaymentDTO implements DTOInterface, Serializable
         return this.currencyAmount;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub

src/main/java/org/pasteque/coreutil/datatransfer/dto/TaxAmountDTO.java

@@ -4,6 +4,7 @@ import java.io.Serializable;
 import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Tax amount Data Transfer Object. A tax amount may refer to a single one
@@ -14,7 +15,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class TaxAmountDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 7429827880917696693L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getTax()}. */
     private WeakAssociationDTO tax;
@@ -26,6 +27,8 @@ public final class TaxAmountDTO implements DTOInterface, Serializable
     private double amount;
     /** See {@link getIncludedInBase()}. */
     private boolean includedInBase;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create a tax from all fields.
@@ -34,18 +37,21 @@ public final class TaxAmountDTO implements DTOInterface, Serializable
      * @param base See {@link getBase()}.
      * @param amount See {@link getAmount()}.
      * @param includedInBase See {@link getIncludedInBase()}.
+     * @param extra See {@link getExtra()}.
      */
     public TaxAmountDTO(
             WeakAssociationDTO tax,
             double taxRate,
             double base,
             double amount,
-            boolean includedInBase) {
+            boolean includedInBase,
+            ExtraObject extra) {
         this.tax = tax;
         this.taxRate = taxRate;
         this.base = base;
         this.amount = amount;
         this.includedInBase = includedInBase;
+        this.extra = extra;
     }
 
     /**
@@ -62,6 +68,7 @@ public final class TaxAmountDTO implements DTOInterface, Serializable
         this.base = reader.readDouble("base");
         this.amount = reader.readDouble("amount");
         this.includedInBase = reader.readBoolean("includedInBase");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -106,6 +113,14 @@ public final class TaxAmountDTO implements DTOInterface, Serializable
         return this.includedInBase;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub

src/main/java/org/pasteque/coreutil/datatransfer/dto/TaxDTO.java

@@ -4,33 +4,39 @@ import java.io.Serializable;
 import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * Tax Data Transfer Object.
  */
 public final class TaxDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 525507510660586665L;
+    private static final long serialVersionUID = 1L;
     /** See {@link getType()}. */
     private String type;
     /** See {@link getAmount()}. */
     private double amount;
     /** See {@link getIncludedInBase()}. */
     private boolean includedInBase;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create a tax from all fields.
      * @param type See {@link getType()}.
      * @param amount See {@link getAmount()}.
      * @param includedInBase See {@link getIncludedInBase()}.
+     * @param extra See {@link getExtra()}.
      */
     public TaxDTO(
             String type,
             double amount,
-            boolean includedInBase) {
+            boolean includedInBase,
+            ExtraObject extra) {
         this.type = type;
         this.amount = amount;
         this.includedInBase = includedInBase;
+        this.extra = extra;
     }
 
     /**
@@ -43,6 +49,7 @@ public final class TaxDTO implements DTOInterface, Serializable
         this.type = reader.readString("type");
         this.amount = reader.readDouble("amount");
         this.includedInBase = reader.readBoolean("includedInBase");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -75,6 +82,14 @@ public final class TaxDTO implements DTOInterface, Serializable
         return this.includedInBase;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub

src/main/java/org/pasteque/coreutil/datatransfer/dto/TicketDTO.java

@@ -7,6 +7,7 @@ import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.DTOFactory;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Receipt of a finalized and paid order. Tickets are immutable unless changes
@@ -17,7 +18,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class TicketDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = 8831777799341373103L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getCashRegister()}. */
     private WeakAssociationDTO cashRegister;
@@ -55,6 +56,8 @@ public final class TicketDTO implements DTOInterface, Serializable
     private double finalPrice;
     /** See {@link getFinalTaxedPrice()}. */
     private double finalTaxedPrice;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create an ticket from all fields.
@@ -76,6 +79,7 @@ public final class TicketDTO implements DTOInterface, Serializable
      * @param discountRate See {@link getDiscountRate()}.
      * @param finalPrice See {@link getFinalPrice()}.
      * @param finalTaxedPrice See {@link getFinalTaxedPrice()}.
+     * @param extra See {@link getExtra()}.
      */
     public TicketDTO(
             WeakAssociationDTO cashRegister,
@@ -95,7 +99,8 @@ public final class TicketDTO implements DTOInterface, Serializable
             WeakAssociationDTO discountProfile,
             double discountRate,
             double finalPrice,
-            double finalTaxedPrice) {
+            double finalTaxedPrice,
+            ExtraObject extra) {
         this.cashRegister = cashRegister;
         this.sequence = sequence;
         this.number = number;
@@ -114,6 +119,7 @@ public final class TicketDTO implements DTOInterface, Serializable
         this.discountRate = discountRate;
         this.finalPrice = finalPrice;
         this.finalTaxedPrice = finalTaxedPrice;
+        this.extra = extra;
     }
 
     /**
@@ -146,6 +152,7 @@ public final class TicketDTO implements DTOInterface, Serializable
         this.taxes = taxFacto.immutableReadObjects("taxes");
         DTOFactory<PaymentDTO> pmtFacto = new DTOFactory<PaymentDTO>(reader, PaymentDTO.class);
         this.payments = pmtFacto.immutableReadObjects("payments");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -311,6 +318,14 @@ public final class TicketDTO implements DTOInterface, Serializable
         return this.finalTaxedPrice;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub
@@ -326,7 +341,7 @@ public final class TicketDTO implements DTOInterface, Serializable
      */
     public class TicketLineDTO implements DTOInterface, Serializable
     {
-        private static final long serialVersionUID = -9065013247136552814L;
+        private static final long serialVersionUID = 1L;
 
         /** See {@link getDispOrder()}. */
         private final int dispOrder;

src/main/java/org/pasteque/coreutil/datatransfer/dto/WeakAssociationDTO.java

@@ -12,7 +12,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public class WeakAssociationDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = -4033459839844194734L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getReference()}. */
     private final String reference;

src/main/java/org/pasteque/coreutil/datatransfer/dto/ZTicketDTO.java

@@ -7,6 +7,7 @@ import org.pasteque.coreutil.ParseException;
 import org.pasteque.coreutil.datatransfer.integrity.IntegrityExceptions;
 import org.pasteque.coreutil.datatransfer.parser.DTOFactory;
 import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Receipt of a finalized cash session. Once a cash session is closed,
@@ -22,7 +23,7 @@ import org.pasteque.coreutil.datatransfer.parser.Reader;
  */
 public final class ZTicketDTO implements DTOInterface, Serializable
 {
-    private static final long serialVersionUID = -2784800199238764159L;
+    private static final long serialVersionUID = 1L;
 
     /** See {@link getCashRegister()}. */
     private WeakAssociationDTO cashRegister;
@@ -64,6 +65,8 @@ public final class ZTicketDTO implements DTOInterface, Serializable
     private ImmutableList<PaymentDTO> payments;
     /** See {@link getCustBalances()}. */
     private ImmutableList<ZTicketCustBalanceDTO> custBalances;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create an ticket from all fields.
@@ -87,6 +90,7 @@ public final class ZTicketDTO implements DTOInterface, Serializable
      * @param catTaxes See {@link getCatTaxes()}.
      * @param payments See {@link getPayments()}.
      * @param custBalances See {@link getCustBalances()}.
+     * @param extra See {@link getExtra()}.
      */
     public ZTicketDTO(
             WeakAssociationDTO cashRegister,
@@ -108,7 +112,8 @@ public final class ZTicketDTO implements DTOInterface, Serializable
             ZTicketCatSalesDTO[] catSales,
             ZTicketCatTaxesDTO[] catTaxes,
             PaymentDTO[] payments,
-            ZTicketCustBalanceDTO[] custBalances) {
+            ZTicketCustBalanceDTO[] custBalances,
+            ExtraObject extra) {
         this.cashRegister = cashRegister;
         this.sequence = sequence;
         this.continuous = continuous;
@@ -129,6 +134,7 @@ public final class ZTicketDTO implements DTOInterface, Serializable
         this.catTaxes = new ImmutableList<ZTicketCatTaxesDTO>(catTaxes);
         this.payments = new ImmutableList<PaymentDTO>(payments);
         this.custBalances = new ImmutableList<ZTicketCustBalanceDTO>(custBalances);
+        this.extra = extra;
     }
 
     /**
@@ -168,7 +174,7 @@ public final class ZTicketDTO implements DTOInterface, Serializable
         this.payments = pmtFacto.immutableReadObjects("payments");
         DTOFactory<ZTicketCustBalanceDTO> custBFacto = new DTOFactory<ZTicketCustBalanceDTO>(reader, ZTicketCustBalanceDTO.class);
         this.custBalances = custBFacto.immutableReadObjects("custBalances");
-        reader.startArray("custBalances");
+        this.extra = reader.readExtra();
     }
 
     /**
@@ -354,6 +360,14 @@ public final class ZTicketDTO implements DTOInterface, Serializable
         return this.custBalances;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     @Override
     public void checkIntegrity() throws IntegrityExceptions {
         // TODO Auto-generated method stub
@@ -365,7 +379,7 @@ public final class ZTicketDTO implements DTOInterface, Serializable
      */
     public class ZTicketCatSalesDTO implements DTOInterface, Serializable
     {
-        private static final long serialVersionUID = -6392552469204214096L;
+        private static final long serialVersionUID = 1L;
 
         /** See {@link getCategory()}. */
         private final WeakAssociationDTO category;
@@ -427,7 +441,7 @@ public final class ZTicketDTO implements DTOInterface, Serializable
      */
     public class ZTicketCatTaxesDTO implements DTOInterface, Serializable
     {
-        private static final long serialVersionUID = -8934368775977813408L;
+        private static final long serialVersionUID = 1L;
 
         /** See {@link getCategory()}. */
         private final WeakAssociationDTO category;
@@ -517,7 +531,7 @@ public final class ZTicketDTO implements DTOInterface, Serializable
      */
     public class ZTicketCustBalanceDTO implements DTOInterface, Serializable
     {
-        private static final long serialVersionUID = 7698608167553284402L;
+        private static final long serialVersionUID = 1L;
 
         /** See {@link getCustomer()}. */
         private final WeakAssociationDTO customer;

src/main/java/org/pasteque/coreutil/datatransfer/dto/package-info.java

@@ -4,5 +4,7 @@
  * <p>All the DTO are final to ensure the immutability. Extensions should use
  * encapsulation to add more data or ease-of-use, to ensure the major package
  * using them cannot be alterated.</p>
+ * <p>This objects contains only amounts and minimal content description, all
+ * other data are stored in extra objects allow extensions.</p>
  */
 package org.pasteque.coreutil.datatransfer.dto;

src/main/java/org/pasteque/coreutil/datatransfer/integrity/IntegrityException.java

@@ -5,7 +5,7 @@ package org.pasteque.coreutil.datatransfer.integrity;
  */
 public abstract class IntegrityException extends Exception
 {
-    private static final long serialVersionUID = 6208213847306142896L;
+    private static final long serialVersionUID = 1L;
 
     /** {@inheritDoc} */
     public IntegrityException() {

src/main/java/org/pasteque/coreutil/datatransfer/integrity/IntegrityExceptions.java

@@ -8,7 +8,7 @@ import java.util.List;
  */
 public class IntegrityExceptions extends Exception
 {
-    private static final long serialVersionUID = -2603644891253059810L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getCauses()} */
     private IntegrityException[] causes;

src/main/java/org/pasteque/coreutil/datatransfer/integrity/InvalidFieldException.java

@@ -5,7 +5,7 @@ package org.pasteque.coreutil.datatransfer.integrity;
  */
 public class InvalidFieldException extends IntegrityException
 {
-    private static final long serialVersionUID = 2512125224337518801L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getConstraint()} */
     private final IntegrityFieldConstraint constraint;

src/main/java/org/pasteque/coreutil/datatransfer/integrity/InvalidRecordException.java

@@ -6,7 +6,7 @@ package org.pasteque.coreutil.datatransfer.integrity;
  */
 public class InvalidRecordException extends IntegrityException
 {
-    private static final long serialVersionUID = -6234201939816973179L;
+    private static final long serialVersionUID = 1L;
 
     /** {@see getConstraint()} */
     private final IntegrityRecordConstraint constraint;

src/main/java/org/pasteque/coreutil/datatransfer/parser/JSONReader.java

@@ -15,7 +15,7 @@ import org.pasteque.coreutil.datatransfer.format.BinaryDTOFormat;
 /**
  * Read values from a JSON representation of data.
  */
-public class JSONReader implements Reader
+public class JSONReader extends ReaderHelper
 {
     /** Constant for the state of not having parsed anything yet. */
     private static final String ROOT_NAME = "__ROOT__";
@@ -98,13 +98,13 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
     public boolean hasKey(String key) throws ParseException {
         this.checkCurrentObject();
         return this.currentObject.has(key);
     }
 
-    @Override
+    @Override // from Reader
     public List<String> listKeys() throws ParseException {
         this.checkCurrentObject();
         Set<String> keySet = this.currentObject.keySet();
@@ -116,25 +116,25 @@ public class JSONReader implements Reader
         return keys;
     }
 
-    @Override
+    @Override // from Reader
     public int getArraySize() throws ParseException {
         this.checkCurrentArray();
         return this.currentArray.length();
     }
 
-    @Override
+    @Override // from Reader
     public boolean isNull(String key) throws ParseException {
         this.checkCurrentObject();
         return this.currentObject.isNull(key);
     }
 
-    @Override
+    @Override // from Reader
     public boolean isNull(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         return this.currentArray.isNull(index);
     }
 
-    @Override
+    @Override // from Reader
     public boolean readBoolean(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -144,12 +144,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public Boolean readBooleanOrNull(String key) throws ParseException {
-        return (this.isNull(key)) ? null : Boolean.valueOf(this.readBoolean(key));
-    }
-
-    @Override
     public boolean readBoolean(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -159,12 +154,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public Boolean readBooleanOrNull(int index) throws ParseException {
-        return (this.isNull(index)) ? null : Boolean.valueOf(this.readBoolean(index));
-    }
-
-    @Override
     public String readString(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -174,17 +164,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public String readStringOrNull(String key) throws ParseException {
-        return (this.isNull(key)) ? null : this.readString(key);
-    }
-
-    @Override
-    public String readStringOrEmpty(String key) throws ParseException {
-        return (this.isNull(key)) ? "" : this.readString(key);
-    }
-
-    @Override
     public String readString(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -194,17 +174,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public String readStringOrNull(int index) throws ParseException {
-        return (this.isNull(index)) ? null : this.readString(index);
-    }
-
-    @Override
-    public String readStringOrEmpty(int index) throws ParseException {
-        return (this.isNull(index)) ? "" : this.readString(index);
-    }
-
-    @Override
     public int readInt(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -214,12 +184,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public Integer readIntOrNull(String key) throws ParseException {
-        return (this.isNull(key)) ? null : Integer.valueOf(this.readInt(key));
-    }
-
-    @Override
     public int readInt(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -229,13 +194,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public Integer readIntOrNull(int index) throws ParseException {
-        return (this.isNull(index)) ? null : Integer.valueOf(this.readInt(index));
-    }
-
-
-    @Override
     public double readDouble(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -245,12 +204,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public Double readDoubleOrNull(String key) throws ParseException {
-        return (this.isNull(key)) ? null : Double.valueOf(this.readDouble(key));
-    }
-
-    @Override
     public double readDouble(int index) throws ParseException {
         this.checkCurrentArray();
         try {
@@ -260,12 +214,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public Double readDoubleOrNull(int index) throws ParseException {
-        return (this.isNull(index)) ? null : Double.valueOf(this.readDouble(index));
-    }
-
-    @Override
     public Date readDate(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -281,12 +230,7 @@ public class JSONReader implements Reader
         }    
     }
 
-    @Override
+    @Override // from Reader
-    public Date readDateOrNull(String key) throws ParseException {
-        return (this.isNull(key)) ? null : this.readDate(key);
-    }
-
-    @Override
     public Date readDate(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -302,12 +246,7 @@ public class JSONReader implements Reader
         }    
     }
 
-    @Override
+    @Override // from Reader
-    public Date readDateOrNull(int index) throws ParseException {
-        return (this.isNull(index)) ? null : this.readDate(index);
-    }
-
-    @Override
     public byte[] readBinary(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -318,12 +257,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public byte[] readBinaryOrNull(String key) throws ParseException {
-        return (this.isNull(key)) ? null : this.readBinary(key);
-    }
-
-    @Override
     public byte[] readBinary(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -334,12 +268,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
-    public byte[] readBinaryOrNull(int index) throws ParseException {
-        return (this.isNull(index)) ? null : this.readBinary(index);
-    }
-
-    @Override
     public void startObject() throws ParseException {
         if (this.currentObject == null && this.currentArray == null
                 && this.mainObject == null && this.mainArray == null) {
@@ -350,7 +279,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
     public void startObject(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -361,7 +290,7 @@ public class JSONReader implements Reader
         this.path.add(new Path(PathType.OBJECT, key));
     }
 
-    @Override
+    @Override // from Reader
     public void startObject(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -373,14 +302,14 @@ public class JSONReader implements Reader
         this.path.add(new Path(PathType.OBJECT, index));
     }
 
-    @Override
+    @Override // from Reader
     public void endObject() throws ParseException {
         this.checkCurrentObject();
         this.path.remove(this.path.size() - 1);
         this.runPath();
     }
 
-    @Override
+    @Override // from Reader
     public void startArray() throws ParseException {
         if (this.currentObject == null && this.currentArray == null
                 && this.mainObject == null && this.mainArray == null) {
@@ -391,7 +320,7 @@ public class JSONReader implements Reader
         }
     }
 
-    @Override
+    @Override // from Reader
     public void startArray(String key) throws ParseException {
         this.checkCurrentObject();
         try {
@@ -403,7 +332,7 @@ public class JSONReader implements Reader
         this.path.add(new Path(PathType.ARRAY, key));
     }
 
-    @Override
+    @Override // from Reader
     public void startArray(int index) throws ParseException {
         this.checkCurrentArrayIndex(index);
         try {
@@ -414,7 +343,7 @@ public class JSONReader implements Reader
         this.path.add(new Path(PathType.ARRAY, index));
     }
 
-    @Override
+    @Override // from Reader
     public void endArray() throws ParseException {
         this.checkCurrentArray();
         this.path.remove(this.path.size() - 1);

src/main/java/org/pasteque/coreutil/datatransfer/parser/Reader.java

@@ -3,6 +3,7 @@ package org.pasteque.coreutil.datatransfer.parser;
 import java.util.Date;
 import java.util.List;
 import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Data reader.</p>
@@ -268,6 +269,15 @@ public interface Reader
      */
     public byte[] readBinaryOrNull(String key) throws ParseException;
 
+    /**
+     * Read the extra object.
+     * @return The root extra object. If not present, it must return an empty
+     * extra object.
+     * @throws ParseException When an error occurs while reading the extra
+     * object.
+     */
+    public ExtraObject readExtra() throws ParseException;
+
     /**
      * Read binary data as base64 at the given index of the current element.
      * @param index The index to read in the current element.

src/main/java/org/pasteque/coreutil/datatransfer/parser/ReaderHelper.java

@@ -0,0 +1,169 @@
+package org.pasteque.coreutil.datatransfer.parser;
+
+import java.util.Date;
+import java.util.List;
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.extra.ExtraObject;
+
+/**
+ * <p>Common behaviour implementation of a data reader.</p>
+ */
+public abstract class ReaderHelper implements Reader
+{
+    @Override // from Reader
+    public abstract boolean hasKey(String key) throws ParseException;
+
+    @Override // from Reader
+    public abstract List<String> listKeys() throws ParseException;
+
+    @Override // from Reader
+    public abstract int getArraySize() throws ParseException;
+
+    @Override // from Reader
+    public abstract boolean isNull(String key) throws ParseException;
+
+    @Override // from Reader
+    public abstract boolean isNull(int index) throws ParseException;
+
+    @Override // from Reader
+    public abstract boolean readBoolean(String key) throws ParseException;
+
+    @Override // from Reader
+    public Boolean readBooleanOrNull(String key) throws ParseException {
+        return (this.isNull(key)) ? null : Boolean.valueOf(this.readBoolean(key));
+    }
+
+    @Override // from Reader
+    public abstract boolean readBoolean(int index) throws ParseException;
+
+    @Override // from Reader
+    public Boolean readBooleanOrNull(int index) throws ParseException {
+        return (this.isNull(index)) ? null : Boolean.valueOf(this.readBoolean(index));
+    }
+    @Override // from Reader
+    public abstract String readString(String key) throws ParseException;
+
+    @Override // from Reader
+    public String readStringOrNull(String key) throws ParseException {
+        return (this.isNull(key)) ? null : this.readString(key);
+    }
+
+    @Override // from Reader
+    public String readStringOrEmpty(String key) throws ParseException {
+        return (this.isNull(key)) ? "" : this.readString(key);
+    }
+
+    @Override // from Reader
+    public abstract String readString(int index) throws ParseException;
+
+    @Override // from Reader
+    public String readStringOrNull(int index) throws ParseException {
+        return (this.isNull(index)) ? null : this.readString(index);
+    }
+
+    @Override // from Reader
+    public String readStringOrEmpty(int index) throws ParseException {
+        return (this.isNull(index)) ? "" : this.readString(index);
+    }
+
+    @Override // from Reader
+    public abstract int readInt(String key) throws ParseException;
+
+    @Override // from Reader
+    public Integer readIntOrNull(String key) throws ParseException {
+        return (this.isNull(key)) ? null : Integer.valueOf(this.readInt(key));
+    }
+
+    @Override // from Reader
+    public abstract int readInt(int index) throws ParseException;
+
+    @Override // from Reader
+    public Integer readIntOrNull(int index) throws ParseException {
+        return (this.isNull(index)) ? null : Integer.valueOf(this.readInt(index));
+    }
+
+    @Override // from Reader
+    public abstract double readDouble(String key) throws ParseException;
+
+    @Override // from Reader
+    public Double readDoubleOrNull(String key) throws ParseException {
+        return (this.isNull(key)) ? null : Double.valueOf(this.readDouble(key));
+    }
+
+    @Override // from Reader
+    public abstract double readDouble(int index) throws ParseException;
+
+    @Override // from Reader
+    public Double readDoubleOrNull(int index) throws ParseException {
+        return (this.isNull(index)) ? null : Double.valueOf(this.readDouble(index));
+    }
+
+    @Override // from Reader
+    public abstract Date readDate(String key) throws ParseException;
+
+    @Override // from Reader
+    public Date readDateOrNull(String key) throws ParseException {
+        return (this.isNull(key)) ? null : this.readDate(key);
+    }
+
+    @Override // from Reader
+    public abstract Date readDate(int index) throws ParseException;
+
+    @Override // from Reader
+    public Date readDateOrNull(int index) throws ParseException {
+        return (this.isNull(index)) ? null : this.readDate(index);
+    }
+
+    @Override // from Reader
+    public abstract byte[] readBinary(String key) throws ParseException;
+
+    @Override // from Reader
+    public byte[] readBinaryOrNull(String key) throws ParseException {
+        return (this.isNull(key)) ? null : this.readBinary(key);
+    }
+
+    @Override // from Reader
+    public abstract byte[] readBinary(int index) throws ParseException;
+
+    @Override // from Reader
+    public byte[] readBinaryOrNull(int index) throws ParseException {
+        return (this.isNull(index)) ? null : this.readBinary(index);
+    }
+
+    @Override // from Reader
+    public ExtraObject readExtra() throws ParseException {
+        if (!this.hasKey(ExtraObject.EXTRA_ROOT_FIELD)
+                || this.isNull(ExtraObject.EXTRA_ROOT_FIELD)) {
+            return new ExtraObject();
+        } else {
+            this.startObject("extra");
+            ExtraObject o = new ExtraObject(this);
+            this.endObject();
+            return o;
+        }
+    }
+
+    @Override // from Reader
+    public abstract void startObject() throws ParseException;
+
+    @Override // from Reader
+    public abstract void startObject(String key) throws ParseException;
+
+    @Override // from Reader
+    public abstract void startObject(int index) throws ParseException;
+
+    @Override // from Reader
+    public abstract void endObject() throws ParseException;
+
+    @Override // from Reader
+    public abstract void startArray() throws ParseException;
+
+    @Override // from Reader
+    public abstract void startArray(String key) throws ParseException;
+
+    @Override // from Reader
+    public abstract void startArray(int index) throws ParseException;
+
+    @Override // from Reader
+    public abstract void endArray() throws ParseException;
+}

src/main/java/org/pasteque/coreutil/datatransfer/parser/Writer.java

@@ -1,5 +1,7 @@
 package org.pasteque.coreutil.datatransfer.parser;
 
+import org.pasteque.coreutil.ParseException;
+
 /**
  * <p>Data writer.</p>
  * <p>A reader must always be initialized from its DTO, typically within
@@ -7,6 +9,123 @@ package org.pasteque.coreutil.datatransfer.parser;
  */
 public interface Writer
 {
+    /**
+     * Add an int to the current array.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an array.
+     */
+    public void writeInt(int value) throws ParseException;
+
+    /**
+     * Add an int to the current object.
+     * @param key The key of the value to write.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an object.
+     */
+    public void writeInt(String key, int value) throws ParseException;
+
+    /**
+     * Add an int to the current array.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an array.
+     */
+    public void writeDouble(double value) throws ParseException;
+
+    /**
+     * Add an int to the current object.
+     * @param key The key of the value to write.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an object.
+     */
+    public void writeDouble(String key, double value) throws ParseException;
+
+    /**
+     * Add an int to the current array.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an array.
+     */
+    public void writeBoolean(boolean value) throws ParseException;
+
+    /**
+     * Add an int to the current object.
+     * @param key The key of the value to write.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an object.
+     */
+    public void writeBoolean(String key, boolean value) throws ParseException;
+
+    /**
+     * Add an int to the current array.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an array.
+     * @throws IllegalArgumentException When the value is null.
+     * Use {@link writeNull()} instead.
+     */
+    public void writeString(String value) throws ParseException;
+
+    /**
+     * Add an int to the current object.
+     * @param key The key of the value to write.
+     * @param value The value to write.
+     * @throws ParseException When writing from outside an object.
+     * @throws IllegalArgumentException When the value is null.
+     * Use {@link writeNull()} instead.
+     */
+    public void writeString(String key, String value) throws ParseException;
+
+    /**
+     * Add a null value to the current array.
+     * @throws ParseException When writing from outside an array.
+     */
+    public void writeNull() throws ParseException;
+
+    /**
+     * Add a null value to the current object.
+     * @param key The key of the value to write.
+     * @throws ParseException When writing from outside an object.
+     */
+    public void writeNull(String key) throws ParseException;
+
+    /**
+     * Start (create) a dictionary as the root element or inside an array.
+     * @throws ParseException When the root element is already created or
+     * not currently inside an array.
+     */
+    public void startObject() throws ParseException;
+
+    /**
+     * Start (create) a dictionary as a child element.
+     * @param key The key to read in the current dictionary.
+     * @throws ParseException When writing a key from outside an object.
+     */
+    public void startObject(String key) throws ParseException;
+
+    /**
+     * Finalize the current object and return up into the tree.
+     * @throws ParseException When the current element is not an object.
+     */
+    public void endObject() throws ParseException;
+
+    /**
+     * Start (create) an array as the root element or inside an array.
+     * @throws ParseException When the root element is already created
+     * or not currently inside an array.
+     */
+    public void startArray() throws ParseException;
+
+    /**
+     * Start (create) an array as a child element.
+     * @param key The key in the parent dictionary.
+     * @throws ParseException When writing a key from outside an object.
+     */
+    public void startArray(String key) throws ParseException;
+
+    /**
+     * Finalize the current array and return up into the tree.
+     * @throws ParseException When the current element is not an array.
+     */
+    public void endArray() throws ParseException;
+
     /**
      * Get the encoded data.
      * @return The encoded data.

src/main/java/org/pasteque/coreutil/extra/ExtraArray.java

@@ -0,0 +1,193 @@
+package org.pasteque.coreutil.extra;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.pasteque.coreutil.ImmutableList;
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Extra data as an array.
+ */
+public final class ExtraArray implements ExtraData
+{
+    /** See {@link getField(). */
+    private final String field;
+    /** See {@link getValue()}. */
+    private final ImmutableList<ExtraData> value;
+    /** See {@link getType()}. */
+    private final ExtraType type;
+
+    /**
+     * Construct an array from a list of values.
+     * @param field The name of the field.
+     * @param type The type of data in the array.
+     * @param value The values in the array. Each data can have the index
+     * as field name.
+     * @throws IllegalArgumentException When the type of one value doesn't match
+     * the type of the array.
+     * @throws Error When one of the {@link ExtraType} is not handled.
+     */
+    /* package */ ExtraArray(String field, ExtraType type, List<ExtraData> value)
+            throws IllegalArgumentException {
+        this.field = field;
+        this.type = type;
+        for (ExtraData extra : value) {
+            if (!this.type.checkExtraType(extra)) {
+                throw new IllegalArgumentException(String.format("Invalid type of data %s, expected %s", extra.getClass().toString(), type.getTypeExtraClass().toString()));
+            }
+        }
+        this.value = new ImmutableList<ExtraData>(value);
+    }
+
+    /**
+     * Construct an array from a list of values.
+     * @param field The name of the field.
+     * @param type The type of data in the array.
+     * @param value The values in the array. Each data can have the index
+     * as field name.
+     * @throws IllegalArgumentException When the type of one value doesn't match
+     * the type of the array.
+     * @throws Error When one of the {@link ExtraType} is not handled.
+     */
+    /* package */ ExtraArray(String field, ExtraType type, ImmutableList<ExtraData> value)
+            throws IllegalArgumentException {
+        this.field = field;
+        this.type = type;
+        for (ExtraData extra : value) {
+            if (!this.type.checkExtraType(extra)) {
+                throw new IllegalArgumentException(String.format("Invalid type of data %s, expected %s", extra.getClass().toString(), type.getTypeExtraClass().toString()));
+            }
+        }
+        this.value = value;
+    }
+
+    /**
+     * Construct an array from a reader.
+     * @param field The name of the field.
+     * @param reader The reader to read data from. It must aready be pointing
+     * to the array.
+     * @throws ParseException When an error happens while reading the data.
+     */
+    /* package */ ExtraArray(String field, Reader reader) throws ParseException {
+        ExtraType arrayType = ExtraType.fromCode(reader.readString("ta"));
+        reader.startArray("v");
+        List<ExtraData> data = new ArrayList<ExtraData>(reader.getArraySize());
+        for (int i = 0; i < reader.getArraySize(); i++) {
+            switch (arrayType) {
+                case STRING:
+                    data.add(new ExtraString(String.valueOf(i), reader.readString(i)));
+                    break;
+                case BOOLEAN:
+                    data.add(new ExtraBoolean(String.valueOf(i), reader.readBoolean(i)));
+                    break;
+                case INTEGER:
+                    data.add(new ExtraInt(String.valueOf(i), reader.readInt(i)));
+                    break;
+                case DOUBLE:
+                    data.add(new ExtraDouble(String.valueOf(i), reader.readDouble(i)));
+                    break;
+                case OBJECT:
+                    reader.startObject(i);
+                    try {
+                        data.add(new ExtraObject(String.valueOf(i), reader));
+                    } catch (ParseException e) {
+                        reader.endObject();
+                        reader.endArray();
+                        throw e;
+                    }
+                    reader.endObject();
+                    break;
+                case ARRAY:
+                    reader.startObject(i);
+                    try {
+                        data.add(new ExtraArray(String.valueOf(i), reader));
+                    } catch (ParseException e) {
+                        reader.endObject();
+                        reader.endArray();
+                        throw e;
+                    }
+                    reader.endObject();
+                    break;
+                case NULL:
+                    data.add(new ExtraNull(String.valueOf(i)));
+                    break;
+                default:
+                    assert false;
+            }
+        }
+        reader.endArray();
+        this.field = field;
+        this.type = arrayType;
+        this.value = new ImmutableList<ExtraData>(data);
+    }
+
+    /**
+     * Get the field associated to this extra data.
+     * @return the field name.
+     */
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    /**
+     * Get the type of value hold.
+     * @return The type of values.
+     */
+    public ExtraType getType() {
+        return this.type;
+    }
+
+    @Override // from ExtraData
+    public ImmutableList<ExtraData> getValue() {
+        return this.value;
+    }
+
+    /**
+     * Write the content of this ExtraArray in the current writer object.
+     * The Writer must already be inside the object to write.
+     * @param to The writer to write to.
+     * @throws ParseException When an error occurs while writing.
+     */
+    private void innerWrite(Writer to) throws ParseException {
+        to.writeString("t", ExtraType.ARRAY.getTypeCode());
+        to.writeString("ta", this.type.getTypeCode());
+        to.startArray("v");
+        for (ExtraData v : this.value) {
+            try {
+                if (v == null || this.type == ExtraType.NULL) {
+                    to.writeNull();
+                } else if (this.type == ExtraType.STRING) {
+                    to.writeString((String) v.getValue());
+                } else if (this.type == ExtraType.BOOLEAN) {
+                    to.writeBoolean((Boolean) v.getValue());
+                } else if (this.type == ExtraType.INTEGER) {
+                    to.writeInt((Integer) v.getValue());
+                } else if (this.type == ExtraType.DOUBLE) {
+                    to.writeDouble((Double) v.getValue());
+                } else if (this.type == ExtraType.OBJECT) {
+                    ((ExtraObject) v).writeInArray(to);
+                } else if (this.type == ExtraType.ARRAY) {
+                    to.startObject();
+                    ((ExtraArray) v).innerWrite(to);
+                    to.endObject();
+                } else {
+                    assert false;
+                }
+            } catch (ParseException e) {
+                to.endArray();
+                throw e;
+            }
+        }
+        to.endArray();
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        this.innerWrite(to);
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraBoolean.java

@@ -0,0 +1,55 @@
+package org.pasteque.coreutil.extra;
+
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Extra data as a boolean.
+ */
+public final class ExtraBoolean implements ExtraData
+{
+    /** See {@link getField(). */
+    private final String field;
+    /** See {@link getBoolean()}. */
+    private final boolean value;
+
+    /**
+     * Create an extra data.
+     * @param field The field name.
+     * @param value the value.
+     */
+    /* package */ ExtraBoolean(String field, boolean value) {
+        this.field = field;
+        this.value = value;
+    }
+
+    /**
+     * Get the field associated to this extra data.
+     * @return the field name.
+     */
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    /**
+     * Get value.
+     * @return The value.
+     */
+    public boolean getBoolean() {
+        return this.value;
+    }
+
+    @Override // from ExtraData
+    public Object getValue() {
+        return Boolean.valueOf(this.value);
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        to.writeString("t", ExtraType.BOOLEAN.getTypeCode());
+        to.writeBoolean("v", this.value);
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraBuilder.java

@@ -0,0 +1,372 @@
+package org.pasteque.coreutil.extra;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * <p>Generator to create and embed {@link org.pasteque.coreutil.extra.ExtraData}
+ * in a dedicated object.</p>
+ * <p>Create a builder and add fields for all extra data and close the builder
+ * to get the root {@link org.pasteque.coreutil.extra.ExtraObject}
+ * to pass to major objects.</p>
+ */
+public final class ExtraBuilder
+{
+    /** The current object being built. Null when building an array. */
+    private TempExtraObject currentObject;
+    /** The current array being built. Null when building an object. */
+    private TempExtraArray currentArray;
+    /** The current branch of the tree of objects and array being built. */
+    private List<ExtraData> path;
+
+    /**
+     * Create an empty builder to create an {@link ExtraObject}.
+     * It will be already pointing to the root object and values can be added
+     * to it.
+     */
+    public ExtraBuilder() {
+        this.path = new ArrayList<ExtraData>();
+        this.currentObject = new TempExtraObject(ExtraObject.EXTRA_ROOT_FIELD);
+        this.path.add(this.currentObject);
+    }
+
+    /**
+     * Check that the builder is currently building an object.
+     * @throws IllegalStateException When not currently building an object.
+     */
+    private void checkCurrentObject() throws IllegalStateException {
+        if (this.currentObject == null) {
+            throw new IllegalStateException("ExtraBuilder is not currently building an object.");
+        }
+    }
+
+    /**
+     * Check that the builder is currently building an array.
+     * @throws IllegalStateException When not currently building an array.
+     */
+    private void checkCurrentArray() throws IllegalStateException {
+        if (this.currentArray == null) {
+            throw new IllegalStateException("ExtraBuilder is not currently building an array.");
+        }
+    }
+
+    /**
+     * End building the current object or array and move up to the path
+     * to get back to editing the parent object or array.
+     * @throws IllegalStateException When already at the root object.
+     * @throws Error When the path contains anything but ExtraObject or ExtraArray.
+     */
+    private void pathUp() throws IllegalStateException {
+        if (path.size() <= 1) {
+            throw new IllegalStateException("ExtraBuilder is already building the root object. Use close() instead.");
+        }
+        this.path.remove(this.path.size() - 1);
+        ExtraData last = this.path.get(this.path.size() - 1);
+        if (last instanceof TempExtraObject) {
+            this.currentObject = (TempExtraObject) last;
+            this.currentArray = null;
+        } else if (last instanceof TempExtraArray) {
+            this.currentObject = null;
+            this.currentArray = (TempExtraArray) last;
+        } else {
+            throw new Error(String.format("Corrupted ExtraBuilder path. Expecting TempExtraObject or TempExtraArray, found %s", last.getClass().toString()));
+        }
+    }
+
+    /**
+     * Start building a new object as a child of the current array.
+     * @throws IllegalStateException When not currently building an array.
+     */
+    public void startObject() throws IllegalStateException {
+        this.checkCurrentArray();
+        TempExtraObject newObject = new TempExtraObject(String.valueOf(this.currentArray.size()));
+        this.currentArray.addValue(newObject);
+        this.path.add(newObject);
+        this.currentObject = newObject;
+        this.currentArray = null;
+    }
+
+    /**
+     * Start building a new object as a value of the current object.
+     * @param field The name of the field of the current object that will hold
+     * the new object.
+     * @throws IllegalStateException When not currently building an object.
+     */
+    public void startObject(String field) throws IllegalStateException {
+        this.checkCurrentObject();
+        TempExtraObject newObject = new TempExtraObject(field);
+        this.currentObject.setValue(newObject);
+        this.path.add(newObject);
+        this.currentObject = newObject;
+        this.currentArray = null;
+    }
+
+    /**
+     * End building the current object and get back to editing its parent.
+     * @throws IllegalStateException When not currently building an object or
+     * when trying to end the root object.
+     */
+    public void endObject() throws IllegalStateException {
+        this.checkCurrentObject();
+        this.pathUp();
+    }
+
+    /**
+     * Start building a new array as a child of the current array.
+     * @param type The type of data the array will contain.
+     * @throws IllegalStateException When not currently building an array.
+     */
+    public void startArray(ExtraType type) throws IllegalStateException {
+        this.checkCurrentArray();
+        TempExtraArray array = new TempExtraArray(this.currentArray.size(), type);
+        this.currentArray.addValue(array);
+        this.path.add(array);
+        this.currentArray = array;
+        this.currentObject = null;
+    }
+
+    /**
+     * Start building a new array as a value of the current object.
+     * @param field The name of the field of the current object that will hold
+     * the new array.
+     * @param type The type of data the array will contain.
+     * @throws IllegalStateException When not currently building an object.
+     */
+    public void startArray(String field, ExtraType type) throws IllegalStateException {
+        this.checkCurrentObject();
+        TempExtraArray array = new TempExtraArray(field, type);
+        this.currentObject.setValue(array);
+        this.path.add(array);
+        this.currentArray = array;
+        this.currentObject = null;
+    }
+
+    /**
+     * End building the current array and get back to editing its parent.
+     * @throws IllegalStateException When not currently building an array.
+     */
+    public void endArray() throws IllegalStateException {
+        this.checkCurrentArray();
+        this.pathUp();
+    }
+
+    /**
+     * Add a null value to the current array.
+     * @throws IllegalStateException When not currently building an array.
+     */
+    public void addNull() throws IllegalStateException {
+        this.checkCurrentArray();
+        this.currentArray.addValue(new ExtraNull(this.currentArray.size()));
+    }
+
+    /**
+     * Add a null value to the current object.
+     * @param field The name of the field that holds the value.
+     * @throws IllegalStateException When not currently building an object.
+     */
+    public void addNull(String field) throws IllegalStateException {
+        this.checkCurrentObject();
+        ExtraNull value = new ExtraNull(field);
+        this.currentObject.setValue(value);
+    }
+
+    /**
+     * Add a value to the current array.
+     * @param value The value to add. It adds a null value instead when null.
+     * @throws IllegalStateException When not currently building an array.
+     * @throws IllegalArgumentException When not building an array of String.
+     */
+    public void add(String value) throws IllegalStateException {
+        this.checkCurrentArray();
+        if (value == null) {
+            this.addNull();
+        } else {
+            this.currentArray.addValue(new ExtraString(this.currentArray.size(), value));
+        }
+    }
+
+    /**
+     * Add a value to the current object.
+     * @param field The name of the field that holds the value.
+     * @param value The value to add. It adds a null value instead when null.
+     * @throws IllegalStateException When not currently building an object.
+     */
+    public void add(String field, String value) throws IllegalStateException {
+        this.checkCurrentObject();
+        if (value == null) {
+            this.addNull(field);
+        } else {
+            this.currentObject.setValue(new ExtraString(field, value));
+        }
+    }
+
+    /**
+     * Add a value to the current array.
+     * @param value The value to add.
+     * @throws IllegalStateException When not currently building an array.
+     * @throws IllegalArgumentException When not building an array of Integers.
+     */
+    public void add(int value) throws IllegalStateException {
+        this.checkCurrentArray();
+        this.currentArray.addValue(new ExtraInt(this.currentArray.size(), value));
+    }
+
+    /**
+     * Add a value to the current object.
+     * @param field The name of the field that holds the value.
+     * @param value The value to add.
+     * @throws IllegalStateException When not currently building an object.
+     */
+    public void add(String field, int value) throws IllegalStateException {
+        this.checkCurrentObject();
+        this.currentObject.setValue(new ExtraInt(field, value));
+    }
+
+    /**
+     * Stop building extra data and get the final object.
+     * Once close is called, no other operation can be done.
+     * @return The finalized extra data to pass to a major object.
+     */
+    public ExtraObject close() {
+        TempExtraObject root = (TempExtraObject) this.path.get(0);
+        this.path.clear();
+        this.currentObject = null;
+        this.currentArray = null;
+        return (ExtraObject) root.finalizeExtra();
+    }
+
+    /**
+     * Interface to convert local temporary extra object and array
+     * to the definitive extra data.
+     */
+    private interface TempExtra {
+        /**
+         * Convert the temporary extra to the definitive one.
+         * @return An immutable extra data.
+         */
+        public ExtraData finalizeExtra();
+    }
+
+    /**
+     * A buildable extra object.
+     */
+    private class TempExtraObject implements ExtraData, TempExtra
+    {
+        private List<ExtraData> data;
+        private String field;
+
+        public TempExtraObject(String field) {
+            this.data = new ArrayList<ExtraData>();
+            this.field = field;
+        }
+
+        /**
+         * Set or replace a value to the current object.
+         * If the field is already set, it is replaced.
+         * @param value The value to add.
+         */
+        private void setValue(ExtraData value) {
+            for (int i = 0; i < this.data.size(); i++) {
+                ExtraData v = this.data.get(i);
+                if (value.getField().equals(v.getField())) {
+                    this.data.set(i, value);
+                    return;
+                }
+            }
+            this.data.add(value);
+        }
+
+        @Override // from ExtraData
+        public String getField() {
+            return this.field;
+        }
+
+        @Override // from ExtraData
+        public ExtraData getValue() {
+            return this.finalizeExtra();
+        }
+
+        /**
+         * Does nothing.
+         * @param w Not used.
+         */
+        @Override // from ExtraData
+        public void write(org.pasteque.coreutil.datatransfer.parser.Writer w) {}
+
+        @Override // from TempExtra
+        public ExtraData finalizeExtra() {
+            for (int i = 0; i < this.data.size(); i++) {
+                ExtraData v = this.data.get(i);
+                if ((v instanceof TempExtra)) {
+                    this.data.set(i, ((TempExtra) v).finalizeExtra());
+                }
+            }
+            return new ExtraObject(this.field, this.data);
+        }
+    }
+
+    /**
+     * A buildable extra array.
+     */
+    private class TempExtraArray implements ExtraData, TempExtra
+    {
+        private List<ExtraData> data;
+        private String field;
+        private ExtraType type;
+
+        public TempExtraArray(String field, ExtraType type) {
+            this.data = new ArrayList<ExtraData>();
+            this.field = field;
+            this.type = type;
+        }
+
+        /**
+         * Get the size of the array as a string for the name of the next
+         * element to add.
+         * @return The size of the array as a string.
+         */
+        public String size() {
+            return String.valueOf(data.size());
+        }
+
+        /**
+         * Add a value to the array.
+         * @param value The value to add.
+         * @throws IllegalArgumentException When the type of one value doesn't match
+         * the type of the array.
+         */
+        private void addValue(ExtraData value) throws IllegalArgumentException {
+            if (!this.type.checkExtraType(value)) {
+                throw new IllegalArgumentException(String.format("Invalid type of data %s, expected %s", value.getClass().toString(), this.type.getTypeExtraClass().toString()));
+            }
+            this.data.add(value);
+        }
+
+        @Override // from ExtraData
+        public String getField() {
+            return this.field;
+        }
+
+        @Override // from ExtraData
+        public ExtraData getValue() {
+            return this.finalizeExtra();
+        }
+
+        /**
+         * Does nothing.
+         * @param w Not used.
+         */
+        @Override // from ExtraData
+        public void write(org.pasteque.coreutil.datatransfer.parser.Writer w) {}
+
+        @Override // from TempExtra
+        public ExtraData finalizeExtra() {
+            for (int i = 0; i < this.data.size(); i++) {
+                ExtraData v = this.data.get(i);
+                if ((v instanceof TempExtra)) {
+                    this.data.set(i, ((TempExtra) v).finalizeExtra());
+                }
+            }
+            return new ExtraArray(this.field, this.type, this.data);
+        }
+    }}

src/main/java/org/pasteque/coreutil/extra/ExtraData.java

@@ -0,0 +1,31 @@
+package org.pasteque.coreutil.extra;
+
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Data outside the minimal ones to be passed to the major version.
+ */
+public interface ExtraData
+{
+    /**
+     * Get the name of the field this data belongs to.
+     * @return The name of the field.
+     */
+    public String getField();
+
+    /**
+     * Get the value of the data as an object.
+     * @return The value.
+     */
+    public Object getValue();
+
+    /**
+     * Write the data to a writer.
+     * @param to The writer to put the data in. The data is not responsible
+     * of the state of the writer. The object holding the extra data must
+     * ensure the writer is in a correct state.
+     * @throws ParseException When the writer is in an incorrect state.
+     */
+    public void write(Writer to) throws ParseException;
+}

src/main/java/org/pasteque/coreutil/extra/ExtraDouble.java

@@ -0,0 +1,55 @@
+package org.pasteque.coreutil.extra;
+
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Extra data as a double.
+ */
+public final class ExtraDouble implements ExtraData
+{
+    /** See {@link getField(). */
+    private final String field;
+    /** See {@link getDouble()}. */
+    private final double value;
+
+    /**
+     * Create an extra data.
+     * @param field The field name.
+     * @param value the value.
+     */
+    /* package */ ExtraDouble(String field, double value) {
+        this.field = field;
+        this.value = value;
+    }
+
+    /**
+     * Get the field associated to this extra data.
+     * @return the field name.
+     */
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    /**
+     * Get value.
+     * @return The value.
+     */
+    public double getDouble() {
+        return this.value;
+    }
+
+    @Override // from ExtraData
+    public Object getValue() {
+        return Double.valueOf(this.value);
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        to.writeString("t", ExtraType.DOUBLE.getTypeCode());
+        to.writeDouble("v", this.value);
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraInt.java

@@ -0,0 +1,55 @@
+package org.pasteque.coreutil.extra;
+
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Extra data as an int.
+ */
+public final class ExtraInt implements ExtraData
+{
+    /** See {@link getField(). */
+    private final String field;
+    /** See {@link getInt()}. */
+    private final int value;
+
+    /**
+     * Create an extra data.
+     * @param field The field name.
+     * @param value the value.
+     */
+    /* package */ ExtraInt(String field, int value) {
+        this.field = field;
+        this.value = value;
+    }
+
+    /**
+     * Get the field associated to this extra data.
+     * @return the field name.
+     */
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    /**
+     * Get value.
+     * @return The value.
+     */
+    public int getInt() {
+        return this.value;
+    }
+
+    @Override // from ExtraData
+    public Object getValue() {
+        return Integer.valueOf(this.value);
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        to.writeString("t", ExtraType.INTEGER.getTypeCode());
+        to.writeInt("v", this.value);
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraNull.java

@@ -0,0 +1,44 @@
+package org.pasteque.coreutil.extra;
+
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Extra data holding a null value. Use this class instead of
+ * typed extra data with a null value.
+ */
+public final class ExtraNull implements ExtraData
+{
+    /** See {@link getField(). */
+    private final String field;
+
+    /**
+     * Create an extra data.
+     * @param field The field name.
+     */
+    /* package */ ExtraNull(String field) {
+        this.field = field;
+    }
+
+    /**
+     * Get the field associated to this extra data.
+     * @return the field name.
+     */
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    @Override // from ExtraData
+    public Object getValue() {
+        return null;
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        to.writeString("t", ExtraType.NULL.getTypeCode());
+        to.writeNull("v");
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraObject.java

@@ -0,0 +1,200 @@
+package org.pasteque.coreutil.extra;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import org.pasteque.coreutil.ImmutableList;
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Reader;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Collection of {@link org.pasteque.coreutil.extra.ExtraData}
+ * to extend major classes. An extra object is the root of the extra data
+ * and can contain other extra objects as well.
+ */
+public final class ExtraObject implements ExtraData
+{
+    /**
+     * The name of the field for the root element of extra data.
+     */
+    public static final String EXTRA_ROOT_FIELD = "extra";
+    /** See {@link getField(). */
+    private final String field;
+    /** See {@link getObject(). */
+    private final ImmutableList<ExtraData> value;
+
+    /**
+     * Sort extra data by key and return an ordered list of them.
+     * @param data The maybe unsorted list of extra data.
+     * @return An immutable list of extra data containing all extra data
+     * sorted alphabetically by their key.
+     * @throws IllegalArgumentException When multiple extra data shares the
+     * same key.
+     */
+    private static ImmutableList<ExtraData> sortExtraKeys(Iterable<ExtraData> data)
+            throws IllegalArgumentException {
+        List<String> keys = new ArrayList<String>();
+        List<ExtraData> sorted = new ArrayList<ExtraData>();
+        for (ExtraData d : data) {
+            keys.add(d.getField());
+        }
+        Collections.sort(keys);
+        String lastKey = null;
+        for (String key : keys) {
+            if (key.equals(lastKey)) {
+                throw new IllegalArgumentException(String.format("Key %s is set multiple times in extra object.", key));
+            }
+            for (ExtraData d : data) {
+                if (d.getField().equals(key)) {
+                    sorted.add(d);
+                    break;
+                }
+            }
+            lastKey = key;
+        }
+        return new ImmutableList<ExtraData>(sorted);
+    }
+
+    /**
+     * Create an empty extra data as the root element.
+     */
+    public ExtraObject() {
+        this(EXTRA_ROOT_FIELD, new ImmutableList<ExtraData>());
+    }
+
+    /**
+     * Create an extra data as the root element.
+     * @param value the value.
+     * @throws IllegalArgumentException When multiple extra data shares the
+     * same key.
+     */
+    /* package */ ExtraObject(List<ExtraData> data) {
+        this(EXTRA_ROOT_FIELD, data);
+    }
+
+    /**
+     * Create an extra data.
+     * @param value the value.
+     * @throws IllegalArgumentException When multiple extra data shares the
+     * same key.
+     */
+    /* package */ ExtraObject(String field, List<ExtraData> data) {
+        this.field = field;
+        this.value = sortExtraKeys(data);
+    }
+
+    /**
+     * Create an extra data.
+     * @param value the value.
+     * @throws IllegalArgumentException When multiple extra data shares the
+     * same key.
+     */
+    /* package */ ExtraObject(String field, ImmutableList<ExtraData> data) {
+        this.field = field;
+        this.value = sortExtraKeys(data);
+    }
+
+    /**
+     * Instantiate from raw data from a reader.
+     * @param key The key to assign to this extra object.
+     * @param reader The reader that must be currently pointing to this object.
+     * @throws IllegalArgumentException When multiple extra data shares the
+     * same key.
+     * @throws ParseException When an error occurs while parsing the object.
+     * See {@link org.pasteque.coreutil.datatransfer.parser.Reader} for details.
+     */
+    /* package */ ExtraObject(String key, Reader reader)
+            throws ParseException, IllegalArgumentException {
+        List<String> keys = reader.listKeys();
+        List<ExtraData> data = new ArrayList<ExtraData>(keys.size());
+        for (String extraKey : keys) {
+            reader.startObject(extraKey);
+            String typeCode = reader.readString("t");
+            ExtraType type = ExtraType.fromCode(typeCode);
+            switch (type) {
+                case STRING:
+                    data.add(new ExtraString(extraKey, reader.readString("v")));
+                    break;
+                case BOOLEAN:
+                    data.add(new ExtraBoolean(extraKey, reader.readBoolean("v")));
+                    break;
+                case INTEGER:
+                    data.add(new ExtraInt(extraKey, reader.readInt("v")));
+                    break;
+                case DOUBLE:
+                    data.add(new ExtraDouble(extraKey, reader.readDouble("v")));
+                    break;
+                case OBJECT:
+                    data.add(new ExtraObject(extraKey, reader));
+                    break;
+                case ARRAY:
+                    data.add(new ExtraArray(extraKey, reader));
+                case NULL:
+                    data.add(new ExtraNull(extraKey));
+                    break;
+                default:
+                    assert false;
+            }
+            reader.endObject();
+        }
+        this.field = key;
+        this.value = sortExtraKeys(data);
+    }
+
+    /**
+     * Instantiate from raw data from a reader.
+     * @param r The reader that must be currently pointing to this object.
+     * @throws ParseException When an error occurs while parsing the object.
+     * See {@link org.pasteque.coreutil.datatransfer.parser.Reader} for details.
+     */
+    public ExtraObject(Reader r) throws ParseException {
+        this(EXTRA_ROOT_FIELD, r);
+    }
+
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    @Override // from ExtraData
+    public Object getValue() {
+        return this.value;
+    }
+
+    /**
+     * Write this object in an {@link ExtraArray} without providing a field
+     * @param to The write to write this object to.
+     * @throws ParseException When an error occurs while writing a field.
+     */
+    /* package */ void writeInArray(Writer to) throws ParseException {
+        to.startObject();
+        for (ExtraData d : this.value) {
+            try {
+                d.write(to);
+            } catch (ParseException e) {
+                to.endObject();
+                throw e;
+            }
+        }
+        to.endObject();
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        to.writeString("t", ExtraType.OBJECT.getTypeCode());
+        to.startObject("v");
+        for (ExtraData d : this.value) {
+            try {
+                d.write(to);
+            } catch (ParseException e) {
+                to.endObject();
+                to.endObject();
+                throw e;
+            }
+        }
+        to.endObject();
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraString.java

@@ -0,0 +1,61 @@
+package org.pasteque.coreutil.extra;
+
+import org.pasteque.coreutil.ParseException;
+import org.pasteque.coreutil.datatransfer.parser.Writer;
+
+/**
+ * Extra data as a {@link java.lang.String}. This can also holds the reference
+ * of an associated object.
+ */
+public final class ExtraString implements ExtraData
+{
+    /** See {@link getField(). */
+    private final String field;
+    /** See {@link getString()}. */
+    private final String value;
+
+    /**
+     * Create an extra data.
+     * @param field The field name.
+     * @param value the value.
+     * @throws InvalidArgumentException When value is null.
+     * @see org.pasteque.coreutil.extra.ExtraNull
+     */
+    /* package */ ExtraString(String field, String value) {
+        if (value == null) {
+            throw new IllegalArgumentException("ExtraData cannot have a null value. Use ExtraNull instead.");
+        }
+        this.field = field;
+        this.value = value;
+    }
+
+    /**
+     * Get the field associated to this extra data.
+     * @return the field name.
+     */
+    @Override // from ExtraData
+    public String getField() {
+        return this.field;
+    }
+
+    /**
+     * Get value.
+     * @return The value.
+     */
+    public String getString() {
+        return this.value;
+    }
+
+    @Override // from ExtraData
+    public Object getValue() {
+        return this.value;
+    }
+
+    @Override // from ExtraData
+    public void write(Writer to) throws ParseException {
+        to.startObject(this.field);
+        to.writeString("t", ExtraType.STRING.getTypeCode());
+        to.writeString("v", this.value);
+        to.endObject();
+    }
+}

src/main/java/org/pasteque/coreutil/extra/ExtraType.java

@@ -0,0 +1,116 @@
+package org.pasteque.coreutil.extra;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Enumeration of available data types}.
+ */
+public enum ExtraType
+{
+    /** Type of {@link java.lang.String}, matching {@link ExtraString} data. */
+    STRING("s", String.class, ExtraString.class),
+    /** Type of boolean data. */
+    BOOLEAN("b", Boolean.class, ExtraBoolean.class),
+    /** Type of integer data. */
+    INTEGER("i", Integer.class, ExtraInt.class),
+    /** Type of float/double data. */
+    DOUBLE("d", Double.class, ExtraDouble.class),
+    /** Type of object data. */
+    OBJECT("o", Map.class, ExtraObject.class),
+    /** Type of array data. */
+    ARRAY("a", List.class, ExtraArray.class),
+    /** Type of null data. */
+    NULL("n", null, ExtraNull.class);
+
+    /** See {@link getTypeCode()}. */
+    private final String typeCode;
+    /** See {@link getTypeClass()}. */
+    private final Class<?> type;
+    /** See {@link getTypeExtraClass()}. */
+    private final Class<? extends ExtraData> extraType;
+
+    /**
+     * Get a type from its type code.
+     * @param code The code value.
+     * @return The according enumeration value.
+     * @throws IllegalArgumentException When code is not found
+     * within the enumerated values
+     */
+    public static final ExtraType fromCode(String code) throws IllegalArgumentException {
+        for (ExtraType v : ExtraType.values()) {
+            if (v.getTypeCode().equals(code)) {
+                return v;
+            }
+        }
+        throw new IllegalArgumentException(code);
+    }
+
+    /**
+     * Get the type of an extra data.
+     * @param data The extra data to check.
+     * @return The type of that extra data.
+     */
+    public static final ExtraType fromExtra(ExtraData data) {
+        for (ExtraType v : ExtraType.values()) {
+            if (v.checkExtraType(data)) {
+                return v;
+            }
+        }
+        throw new Error(String.format("Unknown ExtraData type %s", data.getClass().toString()));
+    }
+
+    /**
+     * Internal constructor.
+     * @param typeCode The code to identify the type.
+     * @param type The expected java class.
+     * @param extraType The expected {@link ExtraData} implementation class.
+     */
+    private ExtraType(String typeCode, Class<?> type, Class<? extends ExtraData> extraType) {
+        this.typeCode = typeCode;
+        this.type = type;
+        this.extraType = extraType;
+    }
+
+    /**
+     * Get the associated constant.
+     * @return The code for DTO.
+     */
+    public String getTypeCode() {
+        return this.typeCode;
+    }
+
+    /**
+     * Get the expected java class of this type.
+     * @return A java class, like String.class.
+     */
+    public Class<?> getTypeClass() {
+        return this.type;
+    }
+
+    /**
+     * Get the expected {@link ExtraData} implementation class.
+     * @return An {@link ExtraData} implementation, like {@link ExtraString}.
+     */
+    public Class<? extends ExtraData> getTypeExtraClass() {
+        return this.extraType;
+    }
+
+    /**
+     * Check if an object is the same java type as this type expects.
+     * @param o The object to check.
+     * @return True if the object is acceptable for this type.
+     */
+    public boolean checkRawType(Object o) {
+        return this.type.isInstance(o);
+    }
+
+    /**
+     * Check if an extra object is the same type as this type expects.
+     * @param o The extra object.
+     * @return True if the object is the same extra type or an {@link ExtraNull}.
+     */
+    public boolean checkExtraType(ExtraData o) {
+        return (this.extraType.isInstance(o)) || (o instanceof ExtraNull);
+    }
+}

src/main/java/org/pasteque/coreutil/extra/package-info.java

@@ -0,0 +1,16 @@
+/**
+ * <p>Non-mandatory data to pass to the major version. Use an
+ * {@link org.pasteque.coreutil.extra.ExtraBuilder} to
+ * remove the semantic from model classes to pass them to major data
+ * that don't care about their meaning.</p>
+ * <p>An {@link org.pasteque.coreutil.extra.ExtraObject} is composed of
+ * types of {@link org.pasteque.coreutil.extra.ExtraData} for typed
+ * values. All values of {@link org.pasteque.coreutil.extra.ExtraData}
+ * implementations are non-null. When the value is null, use an explicit
+ * {@link org.pasteque.coreutil.extra.ExtraNull}.</p>
+ * <p>Extra objects will be found only in the major classes and their
+ * associated DTO from coreutil. Other packages will have the semantic values
+ * instead and convert them to extra data only when creating a major version
+ * of itself through transition interfaces.</p>
+ */
+package org.pasteque.coreutil.extra;

src/main/java/org/pasteque/coreutil/transition/LineTransition.java

@@ -1,6 +1,7 @@
 package org.pasteque.coreutil.transition;
 
 import org.pasteque.coreutil.ImmutableList;
+import org.pasteque.coreutil.extra.ExtraObject;
 import org.pasteque.coreutil.price.Discount;
 import org.pasteque.coreutil.price.Price;
 import org.pasteque.coreutil.price.Quantity;
@@ -63,4 +64,12 @@ public interface LineTransition {
      * @return The full discount applied to the base price.
      */
     public Discount getFinalDiscount();
+
+    /**
+     * Get all other data.
+     * Implementations should use an {@link org.pasteque.coreutil.extra.ExtraBuilder}
+     * to remove the semantic of all non-mandatory fields.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra();
 }

src/main/java/org/pasteque/coreutil/transition/OrderTransition.java

@@ -1,6 +1,8 @@
 package org.pasteque.coreutil.transition;
 
 import org.pasteque.coreutil.ImmutableList;
+import org.pasteque.coreutil.extra.ExtraObject;
+import org.pasteque.coreutil.price.Discount;
 import org.pasteque.coreutil.price.FinalTaxAmount;
 import org.pasteque.coreutil.price.Price2;
 
@@ -32,4 +34,18 @@ public interface OrderTransition
      * @return The content of the order.
      */
     public ImmutableList<LineTransition> getLines();
+
+    /**
+     * Get the discount applied to the whole order.
+     * @return The discount applied to the whole order.
+     */
+    public Discount getDiscount();
+
+    /**
+     * Get all other data.
+     * Implementations should use an {@link org.pasteque.coreutil.extra.ExtraBuilder}
+     * to remove the semantic of all non-mandatory fields.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra();
 }

src/main/java/org/pasteque/major/domain/MajorCashRegister.java

@@ -1,6 +1,7 @@
 package org.pasteque.major.domain;
 
 import org.pasteque.coreutil.datatransfer.dto.CashRegisterDTO;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Model for a cash register. Tickets are associated to a cash register
@@ -14,6 +15,8 @@ public class MajorCashRegister
     private String label;
     /** {@see getNextTicketNumber()} */
     private int nextTicketNumber;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create from all fields.
@@ -21,24 +24,28 @@ public class MajorCashRegister
      * @param label See {@link getLabel()}.
      * @param nextTicketNumber The number to assign to the next ticket
      * from this cash register.
+     * @param extra See {@link getExtra()}.
      */
     public MajorCashRegister(
             String reference,
             String label,
-            int nextTicketNumber) {
+            int nextTicketNumber,
+            ExtraObject extra) {
         this.reference = reference;
         this.label = label;
         this.nextTicketNumber = nextTicketNumber;
+        this.extra = extra;
     }
 
     /**
-     * Create from a DTO. All data are copied to break references.
+     * Create from a DTO.
      * @param dto The DTO to convert.
      */
     public MajorCashRegister(CashRegisterDTO dto) {
-        this.reference = new String(dto.getReference());
+        this.reference = dto.getReference();
-        this.label = new String(dto.getLabel());
+        this.label = dto.getLabel();
         this.nextTicketNumber = dto.getNextTicketNumber();
+        this.extra = dto.getExtra();
     }
 
     /**
@@ -77,4 +84,12 @@ public class MajorCashRegister
     /* package */ final void revertNextTicketNumber() {
         this.nextTicketNumber--;
     }
+
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public final ExtraObject getExtra() {
+        return this.extra;
+    }
 }

src/main/java/org/pasteque/major/domain/MajorCashSession.java

@@ -3,10 +3,10 @@ package org.pasteque.major.domain;
 import java.util.Date;
 import java.util.LinkedList;
 import java.util.List;
-
 import org.pasteque.coreutil.datatransfer.dto.CashSessionDTO;
 import org.pasteque.coreutil.datatransfer.dto.FiscalTicketDTO;
 import org.pasteque.coreutil.datatransfer.dto.MovementDTO;
+import org.pasteque.coreutil.extra.ExtraObject;
 
 /**
  * <p>Ongoing cash session, managing movements and payments.</p>
@@ -32,6 +32,8 @@ public final class MajorCashSession
     private List<MajorTicket> tickets;
     /** See {@link isClosed()}. */
     private boolean closed;
+    /** See {@link getExtra()}. */
+    private ExtraObject extra;
 
     /**
      * Create a cash session from all fields.
@@ -41,6 +43,7 @@ public final class MajorCashSession
      * @param openDate See {@link getOpenDate()}.
      * @param movements The list of movements registered during this session.
      * @param tickets The list of tickets already registered during this session.
+     * @param extra See {@link getExtra()}.
      */
     public MajorCashSession(
             MajorCashRegister cashRegister,
@@ -48,7 +51,8 @@ public final class MajorCashSession
             boolean continuous,
             Date openDate,
             List<Movement> movements,
-            List<MajorTicket> tickets) {
+            List<MajorTicket> tickets,
+            ExtraObject extra) {
         this.cashRegister = cashRegister;
         this.sequence = sequence;
         this.continuous = continuous;
@@ -56,6 +60,7 @@ public final class MajorCashSession
         this.movements = movements;
         this.tickets = tickets;
         this.closed = false;
+        this.extra = extra;
     }
 
     /**
@@ -239,4 +244,12 @@ public final class MajorCashSession
     public Date getOpenDate() {
         return openDate;
     }
+
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public final ExtraObject getExtra() {
+        return this.extra;
+    }
 }

src/main/java/org/pasteque/major/domain/MajorLine.java

@@ -1,6 +1,7 @@
 package org.pasteque.major.domain;
 
 import org.pasteque.coreutil.ImmutableList;
+import org.pasteque.coreutil.extra.ExtraObject;
 import org.pasteque.coreutil.price.Discount;
 import org.pasteque.coreutil.price.Price;
 import org.pasteque.coreutil.price.Quantity;
@@ -15,7 +16,6 @@ import org.pasteque.coreutil.transition.LineTransition;
  * @see org.pasteque.major.domain.MajorOrder
  * @see org.pasteque.major.domain.MajorTicket
  */
-// TODO add extradata to pass to MajorTicket
 public final class MajorLine implements LineTransition
 {
     /** See {@link getProductReference()}. */
@@ -34,6 +34,8 @@ public final class MajorLine implements LineTransition
     private final Price totalPrice;
     /** See {@link getFinalDiscount()}. */
     private final Discount finalDiscount;
+    /** See {@link getExtra()}. */
+    private final ExtraObject extra;
 
     /**
      * <p>Create a major line from outside this package.
@@ -61,6 +63,7 @@ public final class MajorLine implements LineTransition
      * @param totalTaxes See {@link getTotalTaxes()}.
      * @param totalPrice See {@link getTotalPrice()}.
      * @param finalDiscount See {@link getFinalDiscount()}.
+     * @param extra See {@link getExtra()}.
      */
     /* package */ MajorLine(
             String productReference,
@@ -70,7 +73,8 @@ public final class MajorLine implements LineTransition
             Price price,
             ImmutableList<TaxAmount> totalTaxes,
             Price totalPrice,
-            Discount finalDiscount) {
+            Discount finalDiscount,
+            ExtraObject extra) {
         this.productReference = productReference;
         this.productLabel = productLabel;
         this.unitPrice = unitPrice;
@@ -79,6 +83,7 @@ public final class MajorLine implements LineTransition
         this.totalTaxes = totalTaxes;
         this.totalPrice = totalPrice;
         this.finalDiscount = finalDiscount;
+        this.extra = extra;
     }
 
     /**
@@ -94,6 +99,7 @@ public final class MajorLine implements LineTransition
         this.totalTaxes = source.getTotalTaxes();
         this.totalPrice = source.getTotalPrice();
         this.finalDiscount = source.getFinalDiscount();
+        this.extra = source.getExtra();
     }
 
     @Override // from LineTransition
@@ -135,4 +141,9 @@ public final class MajorLine implements LineTransition
     public Discount getFinalDiscount() {
         return this.finalDiscount;
     }
+
+    @Override // from LineTransition
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
 }

src/main/java/org/pasteque/major/domain/MajorOrder.java

@@ -1,6 +1,8 @@
 package org.pasteque.major.domain;
 
 import org.pasteque.coreutil.ImmutableList;
+import org.pasteque.coreutil.extra.ExtraObject;
+import org.pasteque.coreutil.price.Discount;
 import org.pasteque.coreutil.price.FinalTaxAmount;
 import org.pasteque.coreutil.price.Price2;
 import org.pasteque.coreutil.transition.LineTransition;
@@ -13,13 +15,15 @@ import org.pasteque.coreutil.transition.OrderTransition;
  * for ease of use, but instances are not expected to be generated from
  * themselves.</p>
  */
-// TODO add extradata to pass to MajorTicket
 public final class MajorOrder implements OrderTransition
 {
     private final Price2 finalPrice;
     private final ImmutableList<FinalTaxAmount> taxAmounts;
     private final Price2 finalTaxedPrice;
     private final ImmutableList<MajorLine> lines;
+    private final Discount discount;
+    /** See {@link getExtra()}. */
+    private final ExtraObject extra;
 
     /**
      * Create a major order from all data.
@@ -27,16 +31,22 @@ public final class MajorOrder implements OrderTransition
      * @param taxAmounts See {@link getTaxAmounts()}.
      * @param finalTaxedPrice See {@link getFinalTaxedPrice()}.
      * @param lines See {@link getLines()}.
+     * @param discount See {@link getDiscount()}.
+     * @param extra See {@link getExtra()}.
      */
     public MajorOrder(
             Price2 finalPrice,
             ImmutableList<FinalTaxAmount> taxAmounts,
             Price2 finalTaxedPrice,
-            ImmutableList<MajorLine> lines) {
+            ImmutableList<MajorLine> lines,
+            Discount discount,
+            ExtraObject extra) {
         this.finalPrice = finalPrice;
         this.taxAmounts = taxAmounts;
         this.finalTaxedPrice = finalTaxedPrice;
         this.lines = lines;
+        this.discount = discount;
+        this.extra = extra;
     }
 
     /**
@@ -60,10 +70,13 @@ public final class MajorOrder implements OrderTransition
                     trans.getPrice(),
                     trans.getTotalTaxes(),
                     trans.getTotalPrice(),
-                    trans.getFinalDiscount());
+                    trans.getFinalDiscount(),
+                    trans.getExtra());
             
         }
         this.lines = MajorLine.fromTransition(order.getLines());
+        this.discount = order.getDiscount();
+        this.extra = order.getExtra();
     }
 
     /**
@@ -110,4 +123,20 @@ public final class MajorOrder implements OrderTransition
     public ImmutableList<MajorLine> getMajorLines() {
         return this.lines;
     }
+
+    /**
+     * Get the discount applied to the whole order.
+     * @return The discount applied to the whole order.
+     */
+    public Discount getDiscount() {
+        return this.discount;
+    }
+
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
 }

src/main/java/org/pasteque/major/domain/MajorTicket.java

@@ -3,6 +3,7 @@ package org.pasteque.major.domain;
 import java.util.Date;
 import java.util.List;
 import org.pasteque.coreutil.constants.FiscalTicketType;
+import org.pasteque.coreutil.extra.ExtraObject;
 import org.pasteque.coreutil.price.Price2;
 import org.pasteque.coreutil.price.TaxAmount;
 import org.pasteque.coreutil.ImmutableList;
@@ -38,7 +39,8 @@ public final class MajorTicket
     private Price2 finalTaxedPrice;
     /** See {@link getFinalPrice(). */
     private Price2 finalPrice;
-    // TODO: add extra data
+    /** See {@link getExtra(). */
+    private ExtraObject extra;
 
     /**
      * Create by linking an order and payments. It will create the associated
@@ -115,7 +117,7 @@ public final class MajorTicket
      * @return The payment date, when the ticket was created..
      */
     public Date getDate() {
-        return date;
+        return this.date;
     }
 
     /**
@@ -123,7 +125,7 @@ public final class MajorTicket
      * @return The content of the ticket.
      */
     public ImmutableList<MajorLine> getLines() {
-        return lines;
+        return this.lines;
     }
 
     /**
@@ -131,7 +133,7 @@ public final class MajorTicket
      * @return The list of payments used to pay the ticket.
      */
     public ImmutableList<Payment> getPayments() {
-        return payments;
+        return this.payments;
     }
 
     /**
@@ -139,7 +141,7 @@ public final class MajorTicket
      * @return The list of tax amounts.
      */
     public ImmutableList<TaxAmount> getTaxAmounts() {
-        return taxAmounts;
+        return this.taxAmounts;
     }
 
     /**
@@ -147,7 +149,7 @@ public final class MajorTicket
      * @return The total price.
      */
     public Price2 getFinalTaxedPrice() {
-        return finalTaxedPrice;
+        return this.finalTaxedPrice;
     }
 
     /**
@@ -155,6 +157,14 @@ public final class MajorTicket
      * @return The total price without taxes.
      */
     public Price2 getFinalPrice() {
-        return finalPrice;
+        return this.finalPrice;
     }
-}
+
+    /**
+     * Get the non mandatory extra data.
+     * @return The root object containing all the extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+}

src/main/java/org/pasteque/major/domain/MajorZTicket.java

@@ -2,6 +2,7 @@ package org.pasteque.major.domain;
 
 import java.util.Date;
 import java.util.List;
+import org.pasteque.coreutil.extra.ExtraObject;
 import org.pasteque.coreutil.constants.FiscalTicketType;
 import org.pasteque.coreutil.datatransfer.dto.FiscalTicketDTO;
 
@@ -23,7 +24,8 @@ public final class MajorZTicket
             MajorCashSession session,
             Date closeDate,
             int closeType,
-            List<Movement> endAmounts) {
+            List<Movement> endAmounts,
+            ExtraObject extra) {
         // TODO: not implemented
         throw new UnsupportedOperationException("Not implemented yet");
     }

src/main/java/org/pasteque/major/domain/Movement.java

@@ -1,6 +1,7 @@
 package org.pasteque.major.domain;
 
 import java.util.Date;
+import org.pasteque.coreutil.extra.ExtraObject;
 import org.pasteque.coreutil.datatransfer.dto.MovementDTO;
 import org.pasteque.coreutil.datatransfer.dto.WeakAssociationDTO;
 import org.pasteque.coreutil.price.Price2;
@@ -25,6 +26,8 @@ public class Movement
     private final Price2 currencyAmount;
     /** See {@link getDate()}. */
     private Date date;
+    /** See {@link getExtra()}. */
+    private final ExtraObject extra;
 
     /**
      * Create a payment from all fields.
@@ -34,6 +37,7 @@ public class Movement
      * @param currencyLabel See {@link getCurrencyLabel()}.
      * @param currencyAmount See {@link getCurrencyAmount()}.
      * @param date See {@link getDate()}.
+     * @param extra See {@link getExtra()}.
      */
     public Movement(
             String paymentModeReference,
@@ -41,13 +45,15 @@ public class Movement
             String currencyReference,
             String currencyLabel,
             Price2 currencyAmount,
-            Date date) {
+            Date date,
+            ExtraObject extra) {
         this.paymentModeReference = paymentModeReference;
         this.paymentModeLabel = paymentModeLabel;
         this.currencyReference = currencyReference;
         this.currencyLabel = currencyLabel;
         this.currencyAmount = currencyAmount;
         this.date = date;
+        this.extra = extra;
     }
 
     /**
@@ -61,6 +67,7 @@ public class Movement
         this.currencyLabel = dto.getCurrency().getLabel();
         this.currencyAmount = new Price2(dto.getCurrencyAmount());
         this.date = new Date(dto.getDate().getTime());
+        this.extra = dto.getExtra();
     }
 
     /**
@@ -116,6 +123,14 @@ public class Movement
         return this.date;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public final ExtraObject getExtra() {
+        return this.extra;
+    }
+
     /**
      * Get a DTO from this object.
      * @return The content of this object as a DTO.
@@ -129,6 +144,7 @@ public class Movement
                     this.currencyReference,
                     this.currencyLabel),
             this.currencyAmount.toDouble(),
-            this.date);
+            this.date,
+            this.extra);
     }
 }

src/main/java/org/pasteque/major/domain/Payment.java

@@ -1,6 +1,7 @@
 package org.pasteque.major.domain;
 
 import org.pasteque.coreutil.datatransfer.dto.WeakAssociationDTO;
+import org.pasteque.coreutil.extra.ExtraObject;
 import org.pasteque.coreutil.price.Price2;
 import org.pasteque.coreutil.datatransfer.dto.PaymentDTO;
 
@@ -24,6 +25,8 @@ public final class Payment
     private final String currencyLabel;
     /** See {@link getCurrencyAmount()}. */
     private final Price2 currencyAmount;
+    /** See {@link getExtra()}. */
+    private final ExtraObject extra;
 
     /**
      * Create a payment from all fields.
@@ -33,6 +36,7 @@ public final class Payment
      * @param currencyReference See {@link getCurrencyReference()}.
      * @param currencyLabel See {@link getCurrencyLabel()}.
      * @param currencyAmount See {@link getCurrencyAmount()}.
+     * @param extra See {@link getExtra()}.
      */
     public Payment(
             String paymentModeReference,
@@ -40,13 +44,15 @@ public final class Payment
             String currencyReference,
             String currencyLabel,
             Price2 amount,
-            Price2 currencyAmount) {
+            Price2 currencyAmount,
+            ExtraObject extra) {
         this.paymentModeReference = paymentModeReference;
         this.paymentModeLabel = paymentModeLabel;
         this.currencyReference = currencyReference;
         this.currencyLabel = currencyLabel;
         this.amount = amount;
         this.currencyAmount = currencyAmount;
+        this.extra = extra;
     }
 
     /**
@@ -60,6 +66,7 @@ public final class Payment
         this.currencyReference = dto.getCurrency().getReference();
         this.currencyLabel = dto.getCurrency().getLabel();
         this.currencyAmount = new Price2(dto.getCurrencyAmount());
+        this.extra = dto.getExtra();
     }
 
     /**
@@ -116,6 +123,14 @@ public final class Payment
         return currencyAmount;
     }
 
+    /**
+     * Get all other data.
+     * @return The root object of extra data.
+     */
+    public ExtraObject getExtra() {
+        return this.extra;
+    }
+
     /**
      * Get a DTO from this object.
      * @return The content of this object as a DTO.
@@ -129,6 +144,7 @@ public final class Payment
             new WeakAssociationDTO(
                     this.currencyReference,
                     this.currencyLabel),
-            this.currencyAmount.toDouble());
+            this.currencyAmount.toDouble(),
+            this.extra);
     }
 }

src/main/java/org/pasteque/major/domain/package-info.java

@@ -5,5 +5,4 @@
  * but not modified. All properties and methods are then final but the class
  * may be extended to include more data.</p>
  */
-// TODO: add a way to propagate extra data to the DTO
 package org.pasteque.major.domain;