001 /**
002 * Copyright 2005-2012 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.kuali.rice.ken.util;
017
018 import java.util.HashMap;
019 import java.util.HashSet;
020 import java.util.Iterator;
021 import java.util.Map;
022
023 import javax.xml.namespace.NamespaceContext;
024
025 import org.apache.log4j.Logger;
026
027 /**
028 * XPath NamespaceContext that is configured with a predefined prefix->NS map.
029 * @author Kuali Rice Team (rice.collab@kuali.org)
030 */
031 public class ConfiguredNamespaceContext implements NamespaceContext {
032 private static final Logger LOG = Logger.getLogger(ConfiguredNamespaceContext.class);
033
034 private Map<String, String> prefixToNamespace = new HashMap<String, String>();
035 private Map<String, HashSet<String>> namespaceToPrefix = new HashMap<String, HashSet<String>>();
036
037 /**
038 * Constructs a ConfiguredNamespaceContext.java.
039 * @param prefixToNamespace
040 */
041 public ConfiguredNamespaceContext(Map<String, String> prefixToNamespace) {
042 this.prefixToNamespace = prefixToNamespace;
043 // create a reverse namespace to prefix(es) map
044 for (Map.Entry<String, String> entry: prefixToNamespace.entrySet()) {
045 String namespace = entry.getValue();
046 String prefix = entry.getKey();
047 HashSet<String> prefixes = namespaceToPrefix.get(namespace);
048 if (prefixes == null) {
049 prefixes = new HashSet<String>(4);
050 namespaceToPrefix.put(namespace, prefixes);
051 }
052 prefixes.add(prefix);
053 }
054 }
055
056 /**
057 * @see javax.xml.namespace.NamespaceContext#getNamespaceURI(java.lang.String)
058 */
059 public String getNamespaceURI(String prefix) {
060 //LOG.trace("getNamespaceURI(" + prefix + ")");
061 if (prefix == null) {
062 throw new IllegalArgumentException("The prefix cannot be null.");
063 }
064
065 return prefixToNamespace.get(prefix);
066 }
067
068 /**
069 * @see javax.xml.namespace.NamespaceContext#getPrefix(java.lang.String)
070 */
071 public String getPrefix(String namespaceURI) {
072 //LOG.trace("getPrefix(" + namespaceURI + ")");
073 if (namespaceURI == null) {
074 throw new IllegalArgumentException("The namespace uri cannot be null.");
075 }
076 Iterator<String> prefixes = getPrefixes(namespaceURI);
077 if (prefixes != null) {
078 return prefixes.next();
079 } else {
080 return null;
081 }
082 }
083
084 /**
085 * @see javax.xml.namespace.NamespaceContext#getPrefixes(java.lang.String)
086 */
087 public Iterator<String> getPrefixes(String namespaceURI) {
088 //LOG.trace("getPrefixes(" + namespaceURI + ")");
089 if (namespaceURI == null) {
090 throw new IllegalArgumentException("The namespace uri cannot be null.");
091 }
092
093 HashSet<String> prefixes = namespaceToPrefix.get(namespaceURI);
094 if (prefixes != null && prefixes.size() > 0) {
095 return prefixes.iterator();
096 } else {
097 return null;
098 }
099 }
100 }