001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.servicemix.client;
018
019 import java.util.Map;
020
021 import javax.jbi.messaging.NormalizedMessage;
022 import javax.xml.namespace.NamespaceContext;
023 import javax.xml.namespace.QName;
024 import javax.xml.transform.Source;
025 import javax.xml.xpath.XPath;
026 import javax.xml.xpath.XPathExpressionException;
027 import javax.xml.xpath.XPathFactory;
028 import javax.xml.xpath.XPathFunctionResolver;
029 import javax.xml.xpath.XPathVariableResolver;
030
031 /**
032 * A helper class for working with XPath and {@link Message} instances.
033 *
034 * @version $Revision: $
035 */
036 public class XPathHelper {
037
038 private Source content;
039 private XPathFactory xPathFactory;
040 private XPath xPath;
041
042 public XPathHelper() {
043 }
044
045 public XPathHelper(NormalizedMessage message) {
046 this.content = message.getContent();
047 }
048
049 public XPathHelper(Source content) {
050 this.content = content;
051 }
052
053 public XPathHelper(NormalizedMessage message, Map namespaces) {
054 this(message);
055 setNamespaces(namespaces);
056 }
057
058 public XPathHelper(NormalizedMessage message, NamespaceContext namespaces) {
059 this(message);
060 setNamespaceContext(namespaces);
061 }
062
063 public Object evaluate(String expression, QName arg2) throws XPathExpressionException {
064 return getXPath().evaluate(expression, getItem(), arg2);
065 }
066
067 public String evaluate(String expression) throws XPathExpressionException {
068 return getXPath().evaluate(expression, getItem());
069 }
070
071 public void reset() {
072 if (xPath != null) {
073 getXPath().reset();
074 }
075 }
076
077 // Properties
078 // -------------------------------------------------------------------------
079 public void setMessage(NormalizedMessage message) {
080 setContent(message.getContent());
081 }
082
083 public void setContent(Source content) {
084 this.content = content;
085 }
086
087 public final NamespaceContext getNamespaceContext() {
088 return getXPath().getNamespaceContext();
089 }
090
091 public XPathFunctionResolver getXPathFunctionResolver() {
092 return getXPath().getXPathFunctionResolver();
093 }
094
095 public XPathVariableResolver getXPathVariableResolver() {
096 return getXPath().getXPathVariableResolver();
097 }
098
099 public final void setNamespaceContext(NamespaceContext context) {
100 getXPath().setNamespaceContext(context);
101 }
102
103 public void setXPathFunctionResolver(XPathFunctionResolver resolver) {
104 getXPath().setXPathFunctionResolver(resolver);
105 }
106
107 public void setXPathVariableResolver(XPathVariableResolver resolver) {
108 getXPath().setXPathVariableResolver(resolver);
109 }
110
111 public XPathFactory getXPathFactory() {
112 if (xPathFactory == null) {
113 xPathFactory = XPathFactory.newInstance();
114 }
115 return xPathFactory;
116 }
117
118 public void setXPathFactory(XPathFactory factory) {
119 this.xPathFactory = factory;
120 }
121
122 public Source getContent() {
123 return content;
124 }
125
126 public final XPath getXPath() {
127 if (xPath == null) {
128 xPath = getXPathFactory().newXPath();
129 }
130 return xPath;
131 }
132
133 /**
134 * Sets the namespace context to the given map where the keys are namespace
135 * prefixes and the values are the URIs
136 */
137 public final void setNamespaces(Map namespaces) {
138 setNamespaceContext(new DefaultNamespaceContext(getNamespaceContext(), namespaces));
139 }
140
141 // Implementation methods
142 // -------------------------------------------------------------------------
143 protected Object getItem() {
144 return content;
145 }
146 }