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/* * Copyright 2004 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package javax.xml.bind.annotation; import java.lang.annotation.Target; import java.lang.annotation.Retention; import static java.lang.annotation.ElementType.*; import static java.lang.annotation.RetentionPolicy.*; /** * <p> * Maps a JavaBean property to XML IDREF. * * <p> * To preserve referential integrity of an object graph across XML * serialization followed by a XML deserialization, requires an object * reference to be marshalled by reference or containment * appropriately. Annotations <tt>@XmlID</tt> and <tt>@XmlIDREF</tt> * together allow a customized mapping of a JavaBean property's * type by containment or reference. * * <p><b>Usage</b> </p> * The <tt>@XmlIDREF</tt> annotation can be used with the following * program elements: * <ul> * <li> a JavaBean property </li> * <li> non static, non transient field </li> * </ul> * * <p>See "Package Specification" in javax.xml.bind.package javadoc for * additional common information.</p> * * <p> The usage is subject to the following constraints: * <ul> * * <li> If the type of the field or property is a collection type, * then the collection item type must contain a property or * field annotated with <tt>@XmlID</tt>. </li> * <li> If the field or property is single valued, then the type of * the property or field must contain a property or field * annotated with <tt>@XmlID</tt>. * <p>Note: If the collection item type or the type of the * property (for non collection type) is java.lang.Object, then * the instance must contain a property/field annotated with * <tt>@XmlID</tt> attribute. * </li> * <li> This annotation can be used with the following annotations: * {@link XmlElement}, {@link XmlAttribute}, {@link XmlList}, * and {@link XmlElements}.</li> * * </ul> * <p><b>Example:</b> Map a JavaBean property to <tt>xs:IDREF</tt> * (i.e. by reference rather than by containment)</p> * <pre> * * //EXAMPLE: Code fragment * public class Shipping { * @XmlIDREF public Customer getCustomer(); * public void setCustomer(Customer customer); * .... * } * * <!-- Example: XML Schema fragment --> * <xs:complexType name="Shipping"> * <xs:complexContent> * <xs:sequence> * <xs:element name="customer" type="xs:IDREF"/> * .... * </xs:sequence> * </xs:complexContent> * </xs:complexType> * * </pre> * * * <p><b>Example 2: </b> The following is a complete example of * containment versus reference. * * <pre> * // By default, Customer maps to complex type <tt>xs:Customer</tt> * public class Customer { * * // map JavaBean property type to <tt>xs:ID</tt> * @XmlID public String getCustomerID(); * public void setCustomerID(String id); * * // .... other properties not shown * } * * * // By default, Invoice maps to a complex type <tt>xs:Invoice</tt> * public class Invoice { * * // map by reference * @XmlIDREF public Customer getCustomer(); * public void setCustomer(Customer customer); * * // .... other properties not shown here * } * * // By default, Shipping maps to complex type <tt>xs:Shipping</tt> * public class Shipping { * * // map by reference * @XmlIDREF public Customer getCustomer(); * public void setCustomer(Customer customer); * } * * // at least one class must reference Customer by containment; * // Customer instances won't be marshalled. * @XmlElement(name="CustomerData") * public class CustomerData { * // map reference to Customer by containment by default. * public Customer getCustomer(); * * // maps reference to Shipping by containment by default. * public Shipping getShipping(); * * // maps reference to Invoice by containment by default. * public Invoice getInvoice(); * } * * <!-- XML Schema mapping for above code frament --> * * <xs:complexType name="Invoice"> * <xs:complexContent> * <xs:sequence> * <xs:element name="customer" type="xs:IDREF"/> * .... * </xs:sequence> * </xs:complexContent> * </xs:complexType> * * <xs:complexType name="Shipping"> * <xs:complexContent> * <xs:sequence> * <xs:element name="customer" type="xs:IDREF"/> * .... * </xs:sequence> * </xs:complexContent> * </xs:complexType> * * <xs:complexType name="Customer"> * <xs:complexContent> * <xs:sequence> * .... * </xs:sequence> * <xs:attribute name="CustomerID" type="xs:ID"/> * </xs:complexContent> * </xs:complexType> * * <xs:complexType name="CustomerData"> * <xs:complexContent> * <xs:sequence> * <xs:element name="customer" type="xs:Customer"/> * <xs:element name="shipping" type="xs:Shipping"/> * <xs:element name="invoice" type="xs:Invoice"/> * </xs:sequence> * </xs:complexContent> * </xs:complexType> * * <xs:element name"customerData" type="xs:CustomerData"/> * * <!-- Instance document conforming to the above XML Schema --> * <customerData> * <customer customerID="Alice"> * .... * </customer> * * <shipping customer="Alice"> * .... * </shipping> * * <invoice customer="Alice"> * .... * </invoice> * </customerData> * * </pre> * * <p><b>Example 3: </b> Mapping List to repeating element of type IDREF * <pre> * // Code fragment * public class Shipping { * @XmlIDREF * @XmlElement(name="Alice") * public List customers; * } * * <!-- XML schema fragment --> * <xs:complexType name="Shipping"> * <xs:sequence> * <xs:choice minOccurs="0" maxOccurs="unbounded"> * <xs:element name="Alice" type="xs:IDREF"/> * </xs:choice> * </xs:sequence> * </xs:complexType> * </pre> * * <p><b>Example 4: </b> Mapping a List to a list of elements of type IDREF. * <pre> * //Code fragment * public class Shipping { * @XmlIDREF * @XmlElements( * @XmlElement(name="Alice", type="Customer.class") * @XmlElement(name="John", type="InternationalCustomer.class") * public List customers; * } * * <!-- XML Schema fragment --> * <xs:complexType name="Shipping"> * <xs:sequence> * <xs:choice minOccurs="0" maxOccurs="unbounded"> * <xs:element name="Alice" type="xs:IDREF"/> * <xs:element name="John" type="xs:IDREF"/> * </xs:choice> * </xs:sequence> * </xs:complexType> * </pre> * @author Sekhar Vajjhala, Sun Microsystems, Inc. * @see XmlID * @since JAXB2.0 * @version $Revision: 1.11 $ */ @Retention(RUNTIME) @Target({FIELD, METHOD}) public @interface XmlIDREF {}