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package javax.xml.bind.annotation;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
A container for multiple @XmlElement annotations. Multiple annotations of the same type are not allowed on a program element. This annotation therefore serves as a container annotation for multiple @XmlElements as follows:
@XmlElements({ @XmlElement(...),@XmlElement(...) })
The @XmlElements annotation can be used with the following program elements:
- a JavaBean property
- non static, non transient field
This annotation is intended for annotation a JavaBean collection
property (e.g. List).
Usage
The usage is subject to the following constraints:
- This annotation can be used with the following annotations: @
XmlIDREF, @XmlElementWrapper.
- If @XmlIDREF is also specified on the JavaBean property, then each @XmlElement.type() must contain a JavaBean property annotated with
@XmlID.
See "Package Specification" in javax.xml.bind.package javadoc for
additional common information.
Example 1: Map to a list of elements
// Mapped code fragment public class Foo { @XmlElements( @XmlElement(name="A", type=Integer.class), @XmlElement(name="B", type=Float.class) ) public List items; }
<!-- XML Representation for a List of {1,2.5}
XML output is not wrapped using another element -->
...
<A> 1 </A>
<B> 2.5 </B>
...
<!-- XML Schema fragment -->
<xs:complexType name="Foo">
<xs:sequence>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="A" type="xs:int"/>
<xs:element name="B" type="xs:float"/>
<xs:choice>
</xs:sequence>
</xs:complexType>
Example 2: Map to a list of elements wrapped with another element
// Mapped code fragment public class Foo { @XmlElementWrapper(name="bar") @XmlElements( @XmlElement(name="A", type=Integer.class), @XmlElement(name="B", type=Float.class) } public List items; }
<!-- XML Schema fragment -->
<xs:complexType name="Foo">
<xs:sequence>
<xs:element name="bar">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="A" type="xs:int"/>
<xs:element name="B" type="xs:float"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
Example 3: Change element name based on type using an adapter.
class Foo { @XmlJavaTypeAdapter(QtoPAdapter.class) @XmlElements({ @XmlElement(name="A",type=PX.class), @XmlElement(name="B",type=PY.class) }) Q bar; } @XmlType abstract class P {...} @XmlType(name="PX") class PX extends P {...} @XmlType(name="PY") class PY extends P {...}
<!-- XML Schema fragment -->
<xs:complexType name="Foo">
<xs:sequence>
<xs:element name="bar">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="A" type="PX"/>
<xs:element name="B" type="PY"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
Author: - Kohsuke Kawaguchi, Sun Microsystems, Inc.
- Sekhar Vajjhala, Sun Microsystems, Inc.
See Also: Since: 1.6, JAXB 2.0
/**
* <p>
* A container for multiple @{@link XmlElement} annotations.
*
* Multiple annotations of the same type are not allowed on a program
* element. This annotation therefore serves as a container annotation
* for multiple @XmlElements as follows:
*
* <pre>
* @XmlElements({ @XmlElement(...),@XmlElement(...) })
* </pre>
*
* <p>The {@code @XmlElements} annotation can be used with the
* following program elements: </p>
* <ul>
* <li> a JavaBean property </li>
* <li> non static, non transient field </li>
* </ul>
*
* This annotation is intended for annotation a JavaBean collection
* property (e.g. List).
*
* <p><b>Usage</b></p>
*
* <p>The usage is subject to the following constraints:
* <ul>
* <li> This annotation can be used with the following
* annotations: @{@link XmlIDREF}, @{@link XmlElementWrapper}. </li>
* <li> If @XmlIDREF is also specified on the JavaBean property,
* then each @XmlElement.type() must contain a JavaBean
* property annotated with {@code @XmlID}.</li>
* </ul>
*
* <p>See "Package Specification" in javax.xml.bind.package javadoc for
* additional common information.</p>
*
* <hr>
*
* <p><b>Example 1:</b> Map to a list of elements</p>
* <pre>
*
* // Mapped code fragment
* public class Foo {
* @XmlElements(
* @XmlElement(name="A", type=Integer.class),
* @XmlElement(name="B", type=Float.class)
* )
* public List items;
* }
* {@code
*
* <!-- XML Representation for a List of {1,2.5}
* XML output is not wrapped using another element -->
* ...
* <A> 1 </A>
* <B> 2.5 </B>
* ...
*
* <!-- XML Schema fragment -->
* <xs:complexType name="Foo">
* <xs:sequence>
* <xs:choice minOccurs="0" maxOccurs="unbounded">
* <xs:element name="A" type="xs:int"/>
* <xs:element name="B" type="xs:float"/>
* <xs:choice>
* </xs:sequence>
* </xs:complexType>
*
* }</pre>
*
* <p><b>Example 2:</b> Map to a list of elements wrapped with another element
* </p>
* <pre>
*
* // Mapped code fragment
* public class Foo {
* @XmlElementWrapper(name="bar")
* @XmlElements(
* @XmlElement(name="A", type=Integer.class),
* @XmlElement(name="B", type=Float.class)
* }
* public List items;
* }
* {@code
*
* <!-- XML Schema fragment -->
* <xs:complexType name="Foo">
* <xs:sequence>
* <xs:element name="bar">
* <xs:complexType>
* <xs:choice minOccurs="0" maxOccurs="unbounded">
* <xs:element name="A" type="xs:int"/>
* <xs:element name="B" type="xs:float"/>
* </xs:choice>
* </xs:complexType>
* </xs:element>
* </xs:sequence>
* </xs:complexType>
* }</pre>
*
* <p><b>Example 3:</b> Change element name based on type using an adapter.
* </p>
* <pre>
* class Foo {
* @XmlJavaTypeAdapter(QtoPAdapter.class)
* @XmlElements({
* @XmlElement(name="A",type=PX.class),
* @XmlElement(name="B",type=PY.class)
* })
* Q bar;
* }
*
* @XmlType abstract class P {...}
* @XmlType(name="PX") class PX extends P {...}
* @XmlType(name="PY") class PY extends P {...}
* {@code
*
* <!-- XML Schema fragment -->
* <xs:complexType name="Foo">
* <xs:sequence>
* <xs:element name="bar">
* <xs:complexType>
* <xs:choice minOccurs="0" maxOccurs="unbounded">
* <xs:element name="A" type="PX"/>
* <xs:element name="B" type="PY"/>
* </xs:choice>
* </xs:complexType>
* </xs:element>
* </xs:sequence>
* </xs:complexType>
* }</pre>
*
* @author <ul><li>Kohsuke Kawaguchi, Sun Microsystems, Inc.</li><li>Sekhar Vajjhala, Sun Microsystems, Inc.</li></ul>
* @see XmlElement
* @see XmlElementRef
* @see XmlElementRefs
* @see XmlJavaTypeAdapter
* @since 1.6, JAXB 2.0
*/
@Retention(RUNTIME) @Target({FIELD,METHOD})
public @interface XmlElements {
Collection of @XmlElement annotations /**
* Collection of @{@link XmlElement} annotations
*/
XmlElement[] value();
}