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Java example source code file (NamespacePrefixMapper.java)
The NamespacePrefixMapper.java Java example source code/* * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.xml.internal.bind.marshaller; import java.io.OutputStream; import javax.xml.bind.JAXBContext; import javax.xml.stream.XMLEventWriter; import javax.xml.stream.XMLStreamWriter; import javax.xml.transform.dom.DOMResult; import org.w3c.dom.Node; // be careful about changing this class. this class is supposed to be // extended by users and therefore we are not allowed to break // those user code. // // this means: // - don't add any abstract method // - don't change any existing method signature // - don't remove any existing method. /** * Implemented by the user application to determine URI -> prefix * mapping. * * This is considered as an interface, though it's implemented * as an abstract class to make it easy to add new methods in * a future. * * @author * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com) */ public abstract class NamespacePrefixMapper { private static final String[] EMPTY_STRING = new String[0]; /** * Returns a preferred prefix for the given namespace URI. * * This method is intended to be overrided by a derived class. * * <p> * As noted in the return value portion of the javadoc, there * are several cases where the preference cannot be honored. * Specifically, as of JAXB RI 2.0 and onward: * * <ol> * <li> * If the prefix returned is already in use as one of the in-scope * namespace bindings. This is partly necessary for correctness * (so that we don't unexpectedly change the meaning of QNames * bound to {@link String}), partly to simplify the marshaller. * <li> * If the prefix returned is "" yet the current {@link JAXBContext} * includes classes that use the empty namespace URI. This allows * the JAXB RI to reserve the "" prefix for the empty namespace URI, * which is the only possible prefix for the URI. * This restriction is also to simplify the marshaller. * </ol> * * @param namespaceUri * The namespace URI for which the prefix needs to be found. * Never be null. "" is used to denote the default namespace. * @param suggestion * When the content tree has a suggestion for the prefix * to the given namespaceUri, that suggestion is passed as a * parameter. Typicall this value comes from the QName.getPrefix * to show the preference of the content tree. This parameter * may be null, and this parameter may represent an already * occupied prefix. * @param requirePrefix * If this method is expected to return non-empty prefix. * When this flag is true, it means that the given namespace URI * cannot be set as the default namespace. * * @return * null if there's no prefered prefix for the namespace URI. * In this case, the system will generate a prefix for you. * * Otherwise the system will try to use the returned prefix, * but generally there's no guarantee if the prefix will be * actually used or not. * * return "" to map this namespace URI to the default namespace. * Again, there's no guarantee that this preference will be * honored. * * If this method returns "" when requirePrefix=true, the return * value will be ignored and the system will generate one. * * @since JAXB 1.0.1 */ public abstract String getPreferredPrefix(String namespaceUri, String suggestion, boolean requirePrefix); /** * Returns a list of namespace URIs that should be declared * at the root element. * * <p> * By default, the JAXB RI 1.0.x produces namespace declarations only when * they are necessary, only at where they are used. Because of this * lack of look-ahead, sometimes the marshaller produces a lot of * namespace declarations that look redundant to human eyes. For example, * <pre>* * <p> * The JAXB RI 2.x mostly doesn't exhibit this behavior any more, * as it declares all statically known namespace URIs (those URIs * that are used as element/attribute names in JAXB annotations), * but it may still declare additional namespaces in the middle of * a document, for example when (i) a QName as an attribute/element value * requires a new namespace URI, or (ii) DOM nodes as a portion of an object * tree requires a new namespace URI. * * <p> * If you know in advance that you are going to use a certain set of * namespace URIs, you can override this method and have the marshaller * declare those namespace URIs at the root element. * * <p> * For example, by returning <code>new String[]{"urn:foo"}, * the marshaller will produce: * <pre> Other Java examples (source code examples)Here is a short list of links related to this Java NamespacePrefixMapper.java source code file: |
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