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;
/**
* Generates a wrapper element around XML representation.
*
* This is primarily intended to be used to produce a wrapper
* XML element around collections. The annotation therefore supports
* two forms of serialization shown below.
*
* <pre>
* //Example: code fragment
* int[] names;
*
* // XML Serialization Form 1 (Unwrapped collection)
* <names> ... </names>
* <names> ... </names>
*
* // XML Serialization Form 2 ( Wrapped collection )
* <wrapperElement>
* <names> value-of-item </names>
* <names> value-of-item </names>
* ....
* </wrapperElement>
* </pre>
*
* <p> The two serialized XML forms allow a null collection to be
* represented either by absence or presence of an element with a
* nillable attribute.
*
* <p> <b>Usage</b> </p>
* <p>
* The <tt>@XmlElementWrapper</tt> annotation can be used with the
* following program elements:
* <ul>
* <li> JavaBean property </li>
* <li> non static, non transient field </li>
* </ul>
*
* <p>The usage is subject to the following constraints:
* <ul>
* <li> The property must be a collection property </li>
* <li> This annotation can be used with the following annotations:
* {@link XmlElement},
* {@link XmlElements},
* {@link XmlElementRef},
* {@link XmlElementRefs},
* {@link XmlJavaTypeAdapter}</li>.
* </ul>
*
* <p>See "Package Specification" in javax.xml.bind.package javadoc for
* additional common information.</p>
*
* @author <ul><li>Kohsuke Kawaguchi, Sun Microsystems, Inc.</li><li>Sekhar Vajjhala, Sun Microsystems, Inc.</li></ul>
* @see XmlElement
* @see XmlElements
* @see XmlElementRef
* @see XmlElementRefs
* @since JAXB2.0
*
*/
@Retention(RUNTIME) @Target({FIELD, METHOD})
public @interface XmlElementWrapper {
/**
* Name of the XML wrapper element. By default, the XML wrapper
* element name is derived from the JavaBean property name.
*/
String name() default "##default";
/**
* XML target namespace of the XML wrapper element.
* <p>
* If the value is "##default", then the namespace is determined
* as follows:
* <ol>
* <li>
* If the enclosing package has {@link XmlSchema} annotation,
* and its {@link XmlSchema#elementFormDefault() elementFormDefault}
* is {@link XmlNsForm#QUALIFIED QUALIFIED}, then the namespace of
* the enclosing class.
*
* <li>
* Otherwise "" (which produces unqualified element in the default
* namespace.
* </ol>
*/
String namespace() default "##default";
/**
* If true, the absence of the collection is represented by
* using <tt>xsi:nil='true'</tt>. Otherwise, it is represented by
* the absence of the element.
*/
boolean nillable() default false;
/**
* Customize the wrapper element declaration to be required.
*
* <p>
* If required() is true, then the corresponding generated
* XML schema element declaration will have <tt>minOccurs="1"</tt>,
* to indicate that the wrapper element is always expected.
*
* <p>
* Note that this only affects the schema generation, and
* not the unmarshalling or marshalling capability. This is
* simply a mechanism to let users express their application constraints
* better.
*
* @since JAXB 2.1
*/
boolean required() default false;
}
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