001 /*--------------------------------------------------------------------------+
002 $Id: ConstantNamespaceContext.java 26283 2010-02-18 11:18:57Z juergens $
003 | |
004 | Copyright 2005-2010 Technische Universitaet Muenchen |
005 | |
006 | Licensed under the Apache License, Version 2.0 (the "License"); |
007 | you may not use this file except in compliance with the License. |
008 | You may obtain a copy of the License at |
009 | |
010 | http://www.apache.org/licenses/LICENSE-2.0 |
011 | |
012 | Unless required by applicable law or agreed to in writing, software |
013 | distributed under the License is distributed on an "AS IS" BASIS, |
014 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
015 | See the License for the specific language governing permissions and |
016 | limitations under the License. |
017 +--------------------------------------------------------------------------*/
018 package edu.tum.cs.commons.xml;
019
020 import java.util.Iterator;
021
022 import javax.xml.namespace.NamespaceContext;
023 import javax.xml.xpath.XPath;
024
025 /**
026 * A minimalistic implementation of {@link NamespaceContext} to be used with
027 * {@link XPath}. Method {@link #getNamespaceURI(String)} always returns the
028 * string provided to the constructor. All other methods throw
029 * {@link UnsupportedOperationException}s. These methods are not needed for
030 * XPath resolution.
031 * <p>
032 * Implementation is inspired by snippet on <a
033 * href="http://www.ibm.com/developerworks/library/x-javaxpathapi.html">http://www.ibm.com/developerworks/library/x-javaxpathapi.html</a>.
034 *
035 * @author deissenb
036 * @author $Author: juergens $
037 * @version $Rev: 26283 $
038 * @levd.rating GREEN Hash: E9195A8DBCE2646387CB5388F9C332D6
039 */
040 public class ConstantNamespaceContext implements NamespaceContext {
041
042 /** The URI */
043 private final String namesspaceURI;
044
045 /** Create new context. */
046 public ConstantNamespaceContext(String namesspaceURI) {
047 this.namesspaceURI = namesspaceURI;
048 }
049
050 /**
051 * Always returns the string provided to the constructor.
052 */
053 public String getNamespaceURI(String prefix) {
054 return namesspaceURI;
055 }
056
057 /**
058 * Throws {@link UnsupportedOperationException}. This method isn't
059 * necessary for XPath processing.
060 */
061 public String getPrefix(String uri) {
062 throw new UnsupportedOperationException();
063 }
064
065 /**
066 * Throws {@link UnsupportedOperationException}. This method isn't
067 * necessary for XPath processing.
068 */
069 @SuppressWarnings("unchecked")
070 public Iterator getPrefixes(String uri) {
071 throw new UnsupportedOperationException();
072 }
073
074 }