Java tutorial
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 2006-2017 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 * https://oss.oracle.com/licenses/CDDL+GPL-1.1 * or 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 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; import javax.xml.bind.JAXBContext; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import static java.lang.annotation.RetentionPolicy.RUNTIME; import java.lang.annotation.Target; /** * Instructs JAXB to also bind other classes when binding this class. * * <p> * Java makes it impractical/impossible to list all sub-classes of * a given class. This often gets in a way of JAXB users, as it JAXB * cannot automatically list up the classes that need to be known * to {@link JAXBContext}. * * <p> * For example, with the following class definitions: * * <pre> * class Animal {} * class Dog extends Animal {} * class Cat extends Animal {} * </pre> * * <p> * The user would be required to create {@link JAXBContext} as * {@code JAXBContext.newInstance(Dog.class,Cat.class)} * ({@code Animal} will be automatically picked up since {@code Dog} * and {@code Cat} refers to it.) * * <p> * {@link XmlSeeAlso} annotation would allow you to write: * <pre> * @XmlSeeAlso({Dog.class,Cat.class}) * class Animal {} * class Dog extends Animal {} * class Cat extends Animal {} * </pre> * * <p> * This would allow you to do {@code JAXBContext.newInstance(Animal.class)}. * By the help of this annotation, JAXB implementations will be able to * correctly bind {@code Dog} and {@code Cat}. * * @author Kohsuke Kawaguchi * @since 1.6, JAXB 2.1 */ @Target({ ElementType.TYPE }) @Retention(RUNTIME) public @interface XmlSeeAlso { Class[] value(); }