JAXB API 2.2.12 Source Code

Java Architecture for XML Binding (JAXB) is a Java API that allows Java developers to map Java classes to XML representations.

jaxb-api-2.2.12.jar is the JAR file for the JAXB API 2.2 specification. You can download and use it directly without any building process as shown in the last tutorial.

If you want to rebuild the JAR file, you can download the source code at JAXB API Maven Website.

You can also browse the source code below:

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javax/xml/bind/annotation/XmlElementRef.java

/*
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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package javax.xml.bind.annotation;

import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;

/** 
 * <p>
 * Maps a JavaBean property to a XML element derived from property's type.
 * <p>
 * <b>Usage</b>
 * <p>
 * <tt>&#64;XmlElementRef</tt> annotation can be used with a 
 * JavaBean property or from within {@link XmlElementRefs}
 * <p>
 * This annotation dynamically associates an XML element name with the JavaBean
 * property. When a JavaBean property is annotated with {@link
 * XmlElement}, the XML element name is statically derived from the
 * JavaBean property name. However, when this annotation is used, the
 * XML element name is derived from the instance of the type of the
 * JavaBean property at runtime.
 *
 * <h3> XML Schema substitution group support </h3>
 * XML Schema allows a XML document author to use XML element names
 * that were not statically specified in the content model of a
 * schema using substitution groups. Schema derived code provides 
 * support for substitution groups using an <i>element property</i>,
 * (section 5.5.5, "Element Property" of JAXB 2.0 specification). An
 * element property method signature is of the form:
 * <pre>
 *     public void setTerm(JAXBElement&lt;? extends Operator&gt;);
 *     public JAXBElement&lt;? extends Operator&gt; getTerm();
 * </pre>
 * <p>
 * An element factory method annotated with  {@link XmlElementDecl} is
 * used to create a <tt>JAXBElement</tt> instance, containing an XML
 * element name. The presence of &#64;XmlElementRef annotation on an
 * element property indicates that the element name from <tt>JAXBElement</tt>
 * instance be used instead of deriving an XML element name from the
 * JavaBean property name.
 * 
 * <p>
 * The usage is subject to the following constraints:
 * <ul>
 *   <li> If the collection item type (for collection property) or
 *        property type (for single valued property) is
 *        {@link javax.xml.bind.JAXBElement}, then
 *        <tt>&#64;XmlElementRef}.name()</tt> and <tt>&#64;XmlElementRef.namespace()</tt> must
 *        point an element factory method  with an @XmlElementDecl
 *        annotation in a class annotated  with @XmlRegistry (usually
 *        ObjectFactory class generated by  the schema compiler) :
 *        <ul>
 *            <li> @XmlElementDecl.name() must equal @XmlElementRef.name()  </li>
 *            <li> @XmlElementDecl.namespace() must equal @XmlElementRef.namespace(). </li>
 *        </ul>
 *   </li>
 *   <li> If the collection item type (for collection property) or
 *        property type  (for single valued property) is not
 *        {@link javax.xml.bind.JAXBElement}, then the type referenced by the
 *        property or field must be annotated  with {@link XmlRootElement}. </li>
 *   <li> This annotation can be used with the following annotations:
 *        {@link XmlElementWrapper}, {@link XmlJavaTypeAdapter}.
 *   </ul>
 *
 * <p>See "Package Specification" in javax.xml.bind.package javadoc for
 * additional common information.</p>
 *
 * <p><b>Example 1: Ant Task Example</b></p>
 * The following Java class hierarchy models an Ant build
 * script.  An Ant task corresponds to a class in the class
 * hierarchy. The XML element name of an Ant task is indicated by the
 * &#64;XmlRootElement annotation on its corresponding class.
 * <pre>
 *     &#64;XmlRootElement(name="target")
 *     class Target {
 *         // The presence of &#64;XmlElementRef indicates that the XML
 *         // element name will be derived from the &#64;XmlRootElement 
 *         // annotation on the type (for e.g. "jar" for JarTask). 
 *         &#64;XmlElementRef
 *         List&lt;Task&gt; tasks;
 *     }
 *
 *     abstract class Task {
 *     }
 *
 *     &#64;XmlRootElement(name="jar")
 *     class JarTask extends Task {
 *         ...
 *     }
 *
 *     &#64;XmlRootElement(name="javac")
 *     class JavacTask extends Task {
 *         ...
 *     }
 *
 *     &lt;!-- XML Schema fragment --&gt;
 *     &lt;xs:element name="target" type="Target"&gt;
 *     &lt;xs:complexType name="Target"&gt;
 *       &lt;xs:sequence&gt;
 *         &lt;xs:choice maxOccurs="unbounded"&gt;
 *           &lt;xs:element ref="jar"&gt;
 *           &lt;xs:element ref="javac"&gt;
 *         &lt;/xs:choice&gt;
 *       &lt;/xs:sequence&gt;
 *     &lt;/xs:complexType&gt;
 *
 * </pre>
 * <p>
 * Thus the following code fragment:
 * <pre>
 *     Target target = new Target();
 *     target.tasks.add(new JarTask());
 *     target.tasks.add(new JavacTask());
 *     marshal(target);
 * </pre>
 * will produce the following XML output:
 * <pre>
 *     &lt;target&gt;
 *       &lt;jar&gt;
 *         ....
 *       &lt;/jar&gt;
 *       &lt;javac&gt;
 *         ....
 *       &lt;/javac&gt;
 *     &lt;/target&gt;
 * </pre>
 * <p>
 * It is not an error to have a class that extends <tt>Task</tt>
 * that doesn't have {@link XmlRootElement}. But they can't show up in an
 * XML instance (because they don't have XML element names).
 *
 * <p><b>Example 2: XML Schema Susbstitution group support</b>
 * <p> The following example shows the annotations for XML Schema
 * substitution groups.  The annotations and the ObjectFactory are
 * derived from the schema.
 * 
 * <pre>
 *     &#64;XmlElement
 *     class Math {
 *         //  The value of {@link #type()}is 
 *         //  JAXBElement.class , which indicates the XML
 *         //  element name ObjectFactory - in general a class marked
 *         //  with &#64;XmlRegistry. (See ObjectFactory below)
 *         //  
 *         //  The {@link #name()} is "operator", a pointer to a
 *         // factory method annotated with a
 *         //  {@link XmlElementDecl} with the name "operator". Since
 *         //  "operator" is the head of a substitution group that
 *         //  contains elements "add" and "sub" elements, "operator"
 *         //  element can be substituted in an instance document by
 *         //  elements "add" or "sub". At runtime, JAXBElement
 *         //  instance contains the element name that has been
 *         //  substituted in the XML document.
 *         // 
 *         &#64;XmlElementRef(type=JAXBElement.class,name="operator")
 *         JAXBElement&lt;? extends Operator&gt; term;
 *     }
 *
 *     &#64;XmlRegistry
 *     class ObjectFactory {
 *         &#64;XmlElementDecl(name="operator")
 *         JAXBElement&lt;Operator&gt; createOperator(Operator o) {...}
 *         &#64;XmlElementDecl(name="add",substitutionHeadName="operator")
 *         JAXBElement&lt;Operator&gt; createAdd(Operator o) {...}
 *         &#64;XmlElementDecl(name="sub",substitutionHeadName="operator")
 *         JAXBElement&lt;Operator&gt; createSub(Operator o) {...}
 *     }
 *
 *     class Operator {
 *         ...
 *     }
 * </pre>
 * <p>
 * Thus, the following code fragment
 * <pre>
 *     Math m = new Math();
 *     m.term = new ObjectFactory().createAdd(new Operator());
 *     marshal(m);
 * </pre>
 * will produce the following XML output:
 * <pre>
 *     &lt;math&gt;
 *       &lt;add&gt;...&lt;/add&gt;
 *     &lt;/math&gt;
 * </pre>
 *
 * 
 * @author <ul><li>Kohsuke Kawaguchi, Sun Microsystems,Inc. </li><li>Sekhar Vajjhala, Sun Microsystems, Inc.</li></ul>
 * @see XmlElementRefs
 * @since 1.6, JAXB 2.0
 */
@Retention(RUNTIME)
@Target({FIELD,METHOD})
public @interface XmlElementRef {
    /**
     * The Java type being referenced.
     * <p>
     * If the value is DEFAULT.class, the type is inferred from the
     * the type of the JavaBean property.
     */
    Class type() default DEFAULT.class;

    /**
     * This parameter and {@link #name()} are used to determine the
     * XML element for the JavaBean property.
     *
     * <p> If <tt>type()</tt> is <tt>JAXBElement.class</tt> , then 
     * <tt>namespace()</tt> and <tt>name()</tt>
     * point to a factory method with {@link XmlElementDecl}. The XML
     * element name is the element name from the factory method's
     * {@link XmlElementDecl} annotation or if an element from its
     * substitution group (of which it is a head element) has been
     * substituted in the XML document, then the element name is from the
     * {@link XmlElementDecl} on the substituted element.
     *
     * <p> If {@link #type()} is not <tt>JAXBElement.class</tt>, then
     * the XML element name is the XML element name statically
     * associated with the type using the annotation {@link
     * XmlRootElement} on the type. If the type is not annotated with
     * an {@link XmlElementDecl}, then it is an error.
     *
     * <p> If <tt>type()</tt> is not <tt>JAXBElement.class</tt>, then
     * this value must be "". 
     *
     */
    String namespace() default "";
    /**
     *
     * @see #namespace()
     */
    String name() default "##default";

    /**
     * Used in {@link XmlElementRef#type()} to
     * signal that the type be inferred from the signature
     * of the property.
     */
    static final class DEFAULT {}

    /**
     * Customize the element declaration to be required.
     * <p>
     * If required() is true, then Javabean property is mapped to
     * an XML schema element declaration with minOccurs="1".
     * maxOccurs is "1" for a single valued property and "unbounded"
     * for a multivalued property.
     *
     * <p>
     * If required() is false, then the Javabean property is mapped
     * to XML Schema element declaration with minOccurs="0".
     * maxOccurs is "1" for a single valued property and "unbounded"
     * for a multivalued property.
     *
     * <p>
     * For compatibility with JAXB 2.1, this property defaults to <tt>true</tt>,
     * despite the fact that {@link XmlElement#required()} defaults to false.
     *
     * @since 1.7, JAXB 2.2
     */
    boolean required() default true;
}

javax/xml/bind/annotation/XmlElementRef.java

 

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Release date: 2014-10-10
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