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| <div class="subTitle">javax.xml.bind.annotation</div> |
| <h2 title="Annotation Type XmlIDREF" class="title">Annotation Type XmlIDREF</h2> |
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| <pre>@Retention(value=RUNTIME) |
| @Target(value={FIELD,METHOD}) |
| public @interface <span class="memberNameLabel">XmlIDREF</span></pre> |
| <div class="block"><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 marshaled by reference or containment |
| appropriately. Annotations <code>@XmlID</code> and <code>@XmlIDREF</code> |
| together allow a customized mapping of a JavaBean property's |
| type by containment or reference. |
| |
| <p><b>Usage</b> </p> |
| The <code>@XmlIDREF</code> 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 <code>@XmlID</code>. </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 <code>@XmlID</code>. |
| <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 |
| <code>@XmlID</code> attribute. |
| </li> |
| <li> This annotation can be used with the following annotations: |
| <a href="../../../../javax/xml/bind/annotation/XmlElement.html" title="annotation in javax.xml.bind.annotation"><code>XmlElement</code></a>, <a href="../../../../javax/xml/bind/annotation/XmlAttribute.html" title="annotation in javax.xml.bind.annotation"><code>XmlAttribute</code></a>, <a href="../../../../javax/xml/bind/annotation/XmlList.html" title="annotation in javax.xml.bind.annotation"><code>XmlList</code></a>, |
| and <a href="../../../../javax/xml/bind/annotation/XmlElements.html" title="annotation in javax.xml.bind.annotation"><code>XmlElements</code></a>.</li> |
| |
| </ul> |
| <p><b>Example:</b> Map a JavaBean property to <code>xs:IDREF</code> |
| (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); |
| .... |
| } |
| <code> |
| |
| <!-- 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> |
| |
| </code></pre> |
| |
| |
| <p><b>Example 2: </b> The following is a complete example of |
| containment versus reference. |
| |
| <pre> |
| // By default, Customer maps to complex type <code> xs:Customer</code> |
| public class Customer { |
| |
| // map JavaBean property type to <code> xs:ID</code> |
| @XmlID public String getCustomerID(); |
| public void setCustomerID(String id); |
| |
| // .... other properties not shown |
| } |
| |
| |
| // By default, Invoice maps to a complex type <code> xs:Invoice</code> |
| 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 <code> xs:Shipping</code> |
| 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(); |
| } |
| <code> |
| |
| <!-- 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> |
| |
| </code></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; |
| } |
| <code> |
| |
| <!-- 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> |
| </code></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; |
| } |
| <code> |
| |
| <!-- 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> |
| </code></pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6, JAXB 2.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../javax/xml/bind/annotation/XmlID.html" title="annotation in javax.xml.bind.annotation"><code>XmlID</code></a></dd> |
| </dl> |
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