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:

✍: FYIcenter

javax/xml/bind/annotation/adapters/XmlAdapter.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2004-2014 Oracle and/or its affiliates. All rights reserved.
 *
 * 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.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package javax.xml.bind.annotation.adapters;

/**
 * Adapts a Java type for custom marshaling.
 *
 * <p> <b> Usage: </b> </p>
 *
 * <p>
 * Some Java types do not map naturally to a XML representation, for
 * example <tt>HashMap</tt> or other non JavaBean classes. Conversely,
 * a XML repsentation may map to a Java type but an application may
 * choose to accesss the XML representation using another Java
 * type. For example, the schema to Java binding rules bind
 * xs:DateTime by default to XmlGregorianCalendar. But an application
 * may desire to bind xs:DateTime to a custom type,
 * MyXmlGregorianCalendar, for example. In both cases, there is a
 * mismatch between <i> bound type </i>, used by an application to
 * access XML content and the <i> value type</i>, that is mapped to an
 * XML representation.  
 *
 * <p>
 * This abstract class defines methods for adapting a bound type to a value
 * type or vice versa. The methods are invoked by the JAXB binding
 * framework during marshaling and unmarshalling:
 *
 * <ul>
 *   <li> <b> XmlAdapter.marshal(...): </b> During marshalling, JAXB
 *        binding framework invokes XmlAdapter.marshal(..) to adapt a
 *        bound type to value type, which is then marshaled to XML 
 *        representation. </li> 
 *
 *   <li> <b> XmlAdapter.unmarshal(...): </b> During unmarshalling,
 *        JAXB binding framework first unmarshals XML representation
 *        to a value type and then invokes XmlAdapter.unmarshal(..) to
 *        adapt the value type to a bound type. </li> 
 * </ul>
 *
 * Writing an adapter therefore involves the following steps:
 * 
 * <ul>
 *   <li> Write an adapter that implements this abstract class. </li>
 *   <li> Install the adapter using the annotation {@link
 *        XmlJavaTypeAdapter} </li>
 * </ul>
 *
 * <p><b>Example:</b> Customized mapping of <tt>HashMap</tt></p>
 * <p> The following example illustrates the use of 
 * <tt>&#64;XmlAdapter</tt> and <tt>&#64;XmlJavaTypeAdapter</tt> to
 * customize the mapping of a <tt>HashMap</tt>.
 *
 * <p> <b> Step 1: </b> Determine the desired XML representation for HashMap.
 *
 * <pre>
 *     &lt;hashmap&gt;
 *         &lt;entry key="id123"&gt;this is a value&lt;/entry&gt;
 *         &lt;entry key="id312"&gt;this is another value&lt;/entry&gt;
 *         ...
 *       &lt;/hashmap&gt;
 * </pre>
 *
 * <p> <b> Step 2: </b> Determine the schema definition that the
 * desired XML representation shown above should follow.
 *
 * <pre>
 *     
 *     &lt;xs:complexType name="myHashMapType"&gt;
 *       &lt;xs:sequence&gt;
 *         &lt;xs:element name="entry" type="myHashMapEntryType"
 *                        minOccurs = "0" maxOccurs="unbounded"/&gt;
 *       &lt;/xs:sequence&gt;
 *     &lt;/xs:complexType&gt;
 *
 *     &lt;xs:complexType name="myHashMapEntryType"&gt;
 *       &lt;xs:simpleContent&gt;
 *         &lt;xs:extension base="xs:string"&gt;
 *           &lt;xs:attribute name="key" type="xs:int"/&gt;
 *         &lt;/xs:extension&gt;
 *       &lt;/xs:simpleContent&gt;
 *     &lt;/xs:complexType&gt;
 *
 * </pre>
 *
 * <p> <b> Step 3: </b> Write value types that can generate the above
 * schema definition.
 *
 * <pre>
 *     public class MyHashMapType {
 *         List&lt;MyHashMapEntryType&gt; entry;
 *     }
 *
 *     public class MyHashMapEntryType {
 *         &#64;XmlAttribute
 *         public Integer key; 
 *
 *         &#64;XmlValue
 *         public String value;
 *     }
 * </pre>
 * 
 * <p> <b> Step 4: </b> Write the adapter that adapts the value type,
 * MyHashMapType to a bound type, HashMap, used by the application.
 *
 * <pre>
 *     public final class MyHashMapAdapter extends
 *                        XmlAdapter&lt;MyHashMapType,HashMap&gt; { ... }
 *      
 * </pre>
 *
 * <p> <b> Step 5: </b> Use the adapter.
 *
 * <pre>
 *     public class Foo {
 *         &#64;XmlJavaTypeAdapter(MyHashMapAdapter.class)
 *         HashMap hashmap;
 *         ...
 *     }
 * </pre>
 *
 * The above code fragment will map to the following schema:
 * 
 * <pre>
 *     &lt;xs:complexType name="Foo"&gt;
 *       &lt;xs:sequence&gt;
 *         &lt;xs:element name="hashmap" type="myHashMapType"&gt;
 *       &lt;/xs:sequence&gt;
 *     &lt;/xs:complexType&gt;
 * </pre>
 *
 * @param <BoundType>
 *      The type that JAXB doesn't know how to handle. An adapter is written
 *      to allow this type to be used as an in-memory representation through
 *      the <tt>ValueType</tt>.
 * @param <ValueType>
 *      The type that JAXB knows how to handle out of the box.
 *
 * @author <ul><li>Sekhar Vajjhala, Sun Microsystems Inc.</li> <li> Kohsuke Kawaguchi, Sun Microsystems Inc.</li></ul>
 * @see XmlJavaTypeAdapter
 * @since 1.6, JAXB 2.0
 */
public abstract class XmlAdapter<ValueType,BoundType> {

    /**
     * Do-nothing constructor for the derived classes.
     */
    protected XmlAdapter() {}

    /**
     * Convert a value type to a bound type.
     *
     * @param v
     *      The value to be converted. Can be null.
     * @throws Exception
     *      if there's an error during the conversion. The caller is responsible for
     *      reporting the error to the user through {@link javax.xml.bind.ValidationEventHandler}.
     */
    public abstract BoundType unmarshal(ValueType v) throws Exception;

    /**
     * Convert a bound type to a value type.
     *
     * @param v
     *      The value to be convereted. Can be null.
     * @throws Exception
     *      if there's an error during the conversion. The caller is responsible for
     *      reporting the error to the user through {@link javax.xml.bind.ValidationEventHandler}.
     */
    public abstract ValueType marshal(BoundType v) throws Exception;
}

javax/xml/bind/annotation/adapters/XmlAdapter.java

 

⇒ Download jaxb-api-2.2.12.jar File

⇐ Download JAXB 2.2 Specification and API JAR

⇑ JAXB (Java Architecture for XML Binding) API Specification

⇑⇑ FAQ for jaxb-*.jar - Java Architecture for XML Binding

2021-08-12, 14731👍, 0💬