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| <FONT color="green">001</FONT> /*<a name="line.1"></a> |
| <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <FONT color="green">004</FONT> * distributed with this work for additional information<a name="line.4"></a> |
| <FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the "License");<a name="line.6"></a> |
| <FONT color="green">007</FONT> * you may not use this file except in compliance with the License.<a name="line.7"></a> |
| <FONT color="green">008</FONT> * You may obtain a copy of the License at<a name="line.8"></a> |
| <FONT color="green">009</FONT> *<a name="line.9"></a> |
| <FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <FONT color="green">011</FONT> *<a name="line.11"></a> |
| <FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <FONT color="green">013</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <FONT color="green">014</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <FONT color="green">015</FONT> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <FONT color="green">016</FONT> * limitations under the License.<a name="line.16"></a> |
| <FONT color="green">017</FONT> */<a name="line.17"></a> |
| <FONT color="green">018</FONT> // $Id: XPathImpl.java 1225280 2011-12-28 18:52:55Z mrglavas $<a name="line.18"></a> |
| <FONT color="green">019</FONT> <a name="line.19"></a> |
| <FONT color="green">020</FONT> package org.apache.xpath.jaxp;<a name="line.20"></a> |
| <FONT color="green">021</FONT> <a name="line.21"></a> |
| <FONT color="green">022</FONT> import javax.xml.namespace.QName;<a name="line.22"></a> |
| <FONT color="green">023</FONT> import javax.xml.namespace.NamespaceContext;<a name="line.23"></a> |
| <FONT color="green">024</FONT> import javax.xml.xpath.XPathExpressionException;<a name="line.24"></a> |
| <FONT color="green">025</FONT> import javax.xml.xpath.XPathConstants;<a name="line.25"></a> |
| <FONT color="green">026</FONT> import javax.xml.xpath.XPathFunctionResolver;<a name="line.26"></a> |
| <FONT color="green">027</FONT> import javax.xml.xpath.XPathVariableResolver;<a name="line.27"></a> |
| <FONT color="green">028</FONT> import javax.xml.xpath.XPathExpression;<a name="line.28"></a> |
| <FONT color="green">029</FONT> <a name="line.29"></a> |
| <FONT color="green">030</FONT> import org.apache.xml.dtm.DTM;<a name="line.30"></a> |
| <FONT color="green">031</FONT> import org.apache.xpath.*;<a name="line.31"></a> |
| <FONT color="green">032</FONT> import org.apache.xpath.objects.XObject;<a name="line.32"></a> |
| <FONT color="green">033</FONT> import org.apache.xpath.res.XPATHErrorResources;<a name="line.33"></a> |
| <FONT color="green">034</FONT> import org.apache.xalan.res.XSLMessages;<a name="line.34"></a> |
| <FONT color="green">035</FONT> <a name="line.35"></a> |
| <FONT color="green">036</FONT> import org.w3c.dom.Node;<a name="line.36"></a> |
| <FONT color="green">037</FONT> import org.w3c.dom.DOMImplementation;<a name="line.37"></a> |
| <FONT color="green">038</FONT> import org.w3c.dom.Document;<a name="line.38"></a> |
| <FONT color="green">039</FONT> import org.w3c.dom.traversal.NodeIterator;<a name="line.39"></a> |
| <FONT color="green">040</FONT> <a name="line.40"></a> |
| <FONT color="green">041</FONT> import org.xml.sax.InputSource;<a name="line.41"></a> |
| <FONT color="green">042</FONT> import org.xml.sax.SAXException;<a name="line.42"></a> |
| <FONT color="green">043</FONT> <a name="line.43"></a> |
| <FONT color="green">044</FONT> import javax.xml.parsers.*;<a name="line.44"></a> |
| <FONT color="green">045</FONT> <a name="line.45"></a> |
| <FONT color="green">046</FONT> import java.io.IOException;<a name="line.46"></a> |
| <FONT color="green">047</FONT> <a name="line.47"></a> |
| <FONT color="green">048</FONT> /**<a name="line.48"></a> |
| <FONT color="green">049</FONT> * The XPathImpl class provides implementation for the methods defined in<a name="line.49"></a> |
| <FONT color="green">050</FONT> * javax.xml.xpath.XPath interface. This provide simple access to the results<a name="line.50"></a> |
| <FONT color="green">051</FONT> * of an XPath expression.<a name="line.51"></a> |
| <FONT color="green">052</FONT> *<a name="line.52"></a> |
| <FONT color="green">053</FONT> *<a name="line.53"></a> |
| <FONT color="green">054</FONT> * @version $Revision: 1225280 $<a name="line.54"></a> |
| <FONT color="green">055</FONT> * @author Ramesh Mandava<a name="line.55"></a> |
| <FONT color="green">056</FONT> */<a name="line.56"></a> |
| <FONT color="green">057</FONT> public class XPathImpl implements javax.xml.xpath.XPath {<a name="line.57"></a> |
| <FONT color="green">058</FONT> <a name="line.58"></a> |
| <FONT color="green">059</FONT> // Private variables<a name="line.59"></a> |
| <FONT color="green">060</FONT> private XPathVariableResolver variableResolver;<a name="line.60"></a> |
| <FONT color="green">061</FONT> private XPathFunctionResolver functionResolver;<a name="line.61"></a> |
| <FONT color="green">062</FONT> private XPathVariableResolver origVariableResolver;<a name="line.62"></a> |
| <FONT color="green">063</FONT> private XPathFunctionResolver origFunctionResolver;<a name="line.63"></a> |
| <FONT color="green">064</FONT> private NamespaceContext namespaceContext=null;<a name="line.64"></a> |
| <FONT color="green">065</FONT> private JAXPPrefixResolver prefixResolver;<a name="line.65"></a> |
| <FONT color="green">066</FONT> // By default Extension Functions are allowed in XPath Expressions. If <a name="line.66"></a> |
| <FONT color="green">067</FONT> // Secure Processing Feature is set on XPathFactory then the invocation of<a name="line.67"></a> |
| <FONT color="green">068</FONT> // extensions function need to throw XPathFunctionException<a name="line.68"></a> |
| <FONT color="green">069</FONT> private boolean featureSecureProcessing = false; <a name="line.69"></a> |
| <FONT color="green">070</FONT> <a name="line.70"></a> |
| <FONT color="green">071</FONT> XPathImpl( XPathVariableResolver vr, XPathFunctionResolver fr ) {<a name="line.71"></a> |
| <FONT color="green">072</FONT> this.origVariableResolver = this.variableResolver = vr;<a name="line.72"></a> |
| <FONT color="green">073</FONT> this.origFunctionResolver = this.functionResolver = fr;<a name="line.73"></a> |
| <FONT color="green">074</FONT> }<a name="line.74"></a> |
| <FONT color="green">075</FONT> <a name="line.75"></a> |
| <FONT color="green">076</FONT> XPathImpl( XPathVariableResolver vr, XPathFunctionResolver fr, <a name="line.76"></a> |
| <FONT color="green">077</FONT> boolean featureSecureProcessing ) {<a name="line.77"></a> |
| <FONT color="green">078</FONT> this.origVariableResolver = this.variableResolver = vr;<a name="line.78"></a> |
| <FONT color="green">079</FONT> this.origFunctionResolver = this.functionResolver = fr;<a name="line.79"></a> |
| <FONT color="green">080</FONT> this.featureSecureProcessing = featureSecureProcessing;<a name="line.80"></a> |
| <FONT color="green">081</FONT> }<a name="line.81"></a> |
| <FONT color="green">082</FONT> <a name="line.82"></a> |
| <FONT color="green">083</FONT> /**<a name="line.83"></a> |
| <FONT color="green">084</FONT> * <p>Establishes a variable resolver.</p><a name="line.84"></a> |
| <FONT color="green">085</FONT> *<a name="line.85"></a> |
| <FONT color="green">086</FONT> * @param resolver Variable Resolver<a name="line.86"></a> |
| <FONT color="green">087</FONT> */<a name="line.87"></a> |
| <FONT color="green">088</FONT> public void setXPathVariableResolver(XPathVariableResolver resolver) {<a name="line.88"></a> |
| <FONT color="green">089</FONT> if ( resolver == null ) {<a name="line.89"></a> |
| <FONT color="green">090</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.90"></a> |
| <FONT color="green">091</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.91"></a> |
| <FONT color="green">092</FONT> new Object[] {"XPathVariableResolver"} );<a name="line.92"></a> |
| <FONT color="green">093</FONT> throw new NullPointerException( fmsg );<a name="line.93"></a> |
| <FONT color="green">094</FONT> }<a name="line.94"></a> |
| <FONT color="green">095</FONT> this.variableResolver = resolver;<a name="line.95"></a> |
| <FONT color="green">096</FONT> }<a name="line.96"></a> |
| <FONT color="green">097</FONT> <a name="line.97"></a> |
| <FONT color="green">098</FONT> /**<a name="line.98"></a> |
| <FONT color="green">099</FONT> * <p>Returns the current variable resolver.</p><a name="line.99"></a> |
| <FONT color="green">100</FONT> *<a name="line.100"></a> |
| <FONT color="green">101</FONT> * @return Current variable resolver<a name="line.101"></a> |
| <FONT color="green">102</FONT> */<a name="line.102"></a> |
| <FONT color="green">103</FONT> public XPathVariableResolver getXPathVariableResolver() {<a name="line.103"></a> |
| <FONT color="green">104</FONT> return variableResolver;<a name="line.104"></a> |
| <FONT color="green">105</FONT> }<a name="line.105"></a> |
| <FONT color="green">106</FONT> <a name="line.106"></a> |
| <FONT color="green">107</FONT> /**<a name="line.107"></a> |
| <FONT color="green">108</FONT> * <p>Establishes a function resolver.</p><a name="line.108"></a> |
| <FONT color="green">109</FONT> *<a name="line.109"></a> |
| <FONT color="green">110</FONT> * @param resolver XPath function resolver<a name="line.110"></a> |
| <FONT color="green">111</FONT> */<a name="line.111"></a> |
| <FONT color="green">112</FONT> public void setXPathFunctionResolver(XPathFunctionResolver resolver) {<a name="line.112"></a> |
| <FONT color="green">113</FONT> if ( resolver == null ) {<a name="line.113"></a> |
| <FONT color="green">114</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.114"></a> |
| <FONT color="green">115</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.115"></a> |
| <FONT color="green">116</FONT> new Object[] {"XPathFunctionResolver"} );<a name="line.116"></a> |
| <FONT color="green">117</FONT> throw new NullPointerException( fmsg );<a name="line.117"></a> |
| <FONT color="green">118</FONT> }<a name="line.118"></a> |
| <FONT color="green">119</FONT> this.functionResolver = resolver;<a name="line.119"></a> |
| <FONT color="green">120</FONT> }<a name="line.120"></a> |
| <FONT color="green">121</FONT> <a name="line.121"></a> |
| <FONT color="green">122</FONT> /**<a name="line.122"></a> |
| <FONT color="green">123</FONT> * <p>Returns the current function resolver.</p><a name="line.123"></a> |
| <FONT color="green">124</FONT> *<a name="line.124"></a> |
| <FONT color="green">125</FONT> * @return Current function resolver<a name="line.125"></a> |
| <FONT color="green">126</FONT> */<a name="line.126"></a> |
| <FONT color="green">127</FONT> public XPathFunctionResolver getXPathFunctionResolver() {<a name="line.127"></a> |
| <FONT color="green">128</FONT> return functionResolver;<a name="line.128"></a> |
| <FONT color="green">129</FONT> }<a name="line.129"></a> |
| <FONT color="green">130</FONT> <a name="line.130"></a> |
| <FONT color="green">131</FONT> /**<a name="line.131"></a> |
| <FONT color="green">132</FONT> * <p>Establishes a namespace context.</p><a name="line.132"></a> |
| <FONT color="green">133</FONT> *<a name="line.133"></a> |
| <FONT color="green">134</FONT> * @param nsContext Namespace context to use<a name="line.134"></a> |
| <FONT color="green">135</FONT> */<a name="line.135"></a> |
| <FONT color="green">136</FONT> public void setNamespaceContext(NamespaceContext nsContext) {<a name="line.136"></a> |
| <FONT color="green">137</FONT> if ( nsContext == null ) {<a name="line.137"></a> |
| <FONT color="green">138</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.138"></a> |
| <FONT color="green">139</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.139"></a> |
| <FONT color="green">140</FONT> new Object[] {"NamespaceContext"} );<a name="line.140"></a> |
| <FONT color="green">141</FONT> throw new NullPointerException( fmsg ); <a name="line.141"></a> |
| <FONT color="green">142</FONT> }<a name="line.142"></a> |
| <FONT color="green">143</FONT> this.namespaceContext = nsContext;<a name="line.143"></a> |
| <FONT color="green">144</FONT> this.prefixResolver = new JAXPPrefixResolver ( nsContext );<a name="line.144"></a> |
| <FONT color="green">145</FONT> }<a name="line.145"></a> |
| <FONT color="green">146</FONT> <a name="line.146"></a> |
| <FONT color="green">147</FONT> /**<a name="line.147"></a> |
| <FONT color="green">148</FONT> * <p>Returns the current namespace context.</p><a name="line.148"></a> |
| <FONT color="green">149</FONT> *<a name="line.149"></a> |
| <FONT color="green">150</FONT> * @return Current Namespace context<a name="line.150"></a> |
| <FONT color="green">151</FONT> */<a name="line.151"></a> |
| <FONT color="green">152</FONT> public NamespaceContext getNamespaceContext() {<a name="line.152"></a> |
| <FONT color="green">153</FONT> return namespaceContext;<a name="line.153"></a> |
| <FONT color="green">154</FONT> }<a name="line.154"></a> |
| <FONT color="green">155</FONT> <a name="line.155"></a> |
| <FONT color="green">156</FONT> private static Document d = null;<a name="line.156"></a> |
| <FONT color="green">157</FONT> <a name="line.157"></a> |
| <FONT color="green">158</FONT> private static DocumentBuilder getParser() {<a name="line.158"></a> |
| <FONT color="green">159</FONT> try {<a name="line.159"></a> |
| <FONT color="green">160</FONT> // we'd really like to cache those DocumentBuilders, but we can't because:<a name="line.160"></a> |
| <FONT color="green">161</FONT> // 1. thread safety. parsers are not thread-safe, so at least<a name="line.161"></a> |
| <FONT color="green">162</FONT> // we need one instance per a thread.<a name="line.162"></a> |
| <FONT color="green">163</FONT> // 2. parsers are non-reentrant, so now we are looking at having a<a name="line.163"></a> |
| <FONT color="green">164</FONT> // pool of parsers.<a name="line.164"></a> |
| <FONT color="green">165</FONT> // 3. then the class loading issue. The look-up procedure of<a name="line.165"></a> |
| <FONT color="green">166</FONT> // DocumentBuilderFactory.newInstance() depends on context class loader<a name="line.166"></a> |
| <FONT color="green">167</FONT> // and system properties, which may change during the execution of JVM.<a name="line.167"></a> |
| <FONT color="green">168</FONT> //<a name="line.168"></a> |
| <FONT color="green">169</FONT> // so we really have to create a fresh DocumentBuilder every time we need one<a name="line.169"></a> |
| <FONT color="green">170</FONT> // - KK<a name="line.170"></a> |
| <FONT color="green">171</FONT> DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();<a name="line.171"></a> |
| <FONT color="green">172</FONT> dbf.setNamespaceAware( true );<a name="line.172"></a> |
| <FONT color="green">173</FONT> dbf.setValidating( false );<a name="line.173"></a> |
| <FONT color="green">174</FONT> return dbf.newDocumentBuilder();<a name="line.174"></a> |
| <FONT color="green">175</FONT> } catch (ParserConfigurationException e) {<a name="line.175"></a> |
| <FONT color="green">176</FONT> // this should never happen with a well-behaving JAXP implementation. <a name="line.176"></a> |
| <FONT color="green">177</FONT> throw new Error(e.toString());<a name="line.177"></a> |
| <FONT color="green">178</FONT> }<a name="line.178"></a> |
| <FONT color="green">179</FONT> }<a name="line.179"></a> |
| <FONT color="green">180</FONT> <a name="line.180"></a> |
| <FONT color="green">181</FONT> private static Document getDummyDocument( ) {<a name="line.181"></a> |
| <FONT color="green">182</FONT> // we don't need synchronization here; even if two threads<a name="line.182"></a> |
| <FONT color="green">183</FONT> // enter this code at the same time, we just waste a little time<a name="line.183"></a> |
| <FONT color="green">184</FONT> if(d==null) {<a name="line.184"></a> |
| <FONT color="green">185</FONT> DOMImplementation dim = getParser().getDOMImplementation();<a name="line.185"></a> |
| <FONT color="green">186</FONT> d = dim.createDocument("http://java.sun.com/jaxp/xpath",<a name="line.186"></a> |
| <FONT color="green">187</FONT> "dummyroot", null);<a name="line.187"></a> |
| <FONT color="green">188</FONT> }<a name="line.188"></a> |
| <FONT color="green">189</FONT> return d;<a name="line.189"></a> |
| <FONT color="green">190</FONT> }<a name="line.190"></a> |
| <FONT color="green">191</FONT> <a name="line.191"></a> |
| <FONT color="green">192</FONT> <a name="line.192"></a> |
| <FONT color="green">193</FONT> private XObject eval(String expression, Object contextItem)<a name="line.193"></a> |
| <FONT color="green">194</FONT> throws javax.xml.transform.TransformerException {<a name="line.194"></a> |
| <FONT color="green">195</FONT> org.apache.xpath.XPath xpath = new org.apache.xpath.XPath( expression,<a name="line.195"></a> |
| <FONT color="green">196</FONT> null, prefixResolver, org.apache.xpath.XPath.SELECT ); <a name="line.196"></a> |
| <FONT color="green">197</FONT> org.apache.xpath.XPathContext xpathSupport = null;<a name="line.197"></a> |
| <FONT color="green">198</FONT> <a name="line.198"></a> |
| <FONT color="green">199</FONT> // Create an XPathContext that doesn't support pushing and popping of<a name="line.199"></a> |
| <FONT color="green">200</FONT> // variable resolution scopes. Sufficient for simple XPath 1.0<a name="line.200"></a> |
| <FONT color="green">201</FONT> // expressions.<a name="line.201"></a> |
| <FONT color="green">202</FONT> if ( functionResolver != null ) {<a name="line.202"></a> |
| <FONT color="green">203</FONT> JAXPExtensionsProvider jep = new JAXPExtensionsProvider(<a name="line.203"></a> |
| <FONT color="green">204</FONT> functionResolver, featureSecureProcessing );<a name="line.204"></a> |
| <FONT color="green">205</FONT> xpathSupport = new org.apache.xpath.XPathContext(jep, false);<a name="line.205"></a> |
| <FONT color="green">206</FONT> } else { <a name="line.206"></a> |
| <FONT color="green">207</FONT> xpathSupport = new org.apache.xpath.XPathContext(false);<a name="line.207"></a> |
| <FONT color="green">208</FONT> }<a name="line.208"></a> |
| <FONT color="green">209</FONT> <a name="line.209"></a> |
| <FONT color="green">210</FONT> XObject xobj = null;<a name="line.210"></a> |
| <FONT color="green">211</FONT> <a name="line.211"></a> |
| <FONT color="green">212</FONT> xpathSupport.setVarStack(new JAXPVariableStack(variableResolver));<a name="line.212"></a> |
| <FONT color="green">213</FONT> <a name="line.213"></a> |
| <FONT color="green">214</FONT> // If item is null, then we will create a a Dummy contextNode<a name="line.214"></a> |
| <FONT color="green">215</FONT> if ( contextItem instanceof Node ) {<a name="line.215"></a> |
| <FONT color="green">216</FONT> xobj = xpath.execute (xpathSupport, (Node)contextItem,<a name="line.216"></a> |
| <FONT color="green">217</FONT> prefixResolver );<a name="line.217"></a> |
| <FONT color="green">218</FONT> } else {<a name="line.218"></a> |
| <FONT color="green">219</FONT> xobj = xpath.execute ( xpathSupport, DTM.NULL, prefixResolver );<a name="line.219"></a> |
| <FONT color="green">220</FONT> }<a name="line.220"></a> |
| <FONT color="green">221</FONT> <a name="line.221"></a> |
| <FONT color="green">222</FONT> return xobj;<a name="line.222"></a> |
| <FONT color="green">223</FONT> }<a name="line.223"></a> |
| <FONT color="green">224</FONT> <a name="line.224"></a> |
| <FONT color="green">225</FONT> /**<a name="line.225"></a> |
| <FONT color="green">226</FONT> * <p>Evaluate an <code>XPath</code> expression in the specified context and return the result as the specified type.</p><a name="line.226"></a> |
| <FONT color="green">227</FONT> *<a name="line.227"></a> |
| <FONT color="green">228</FONT> * <p>See "Evaluation of XPath Expressions" section of JAXP 1.3 spec<a name="line.228"></a> |
| <FONT color="green">229</FONT> * for context item evaluation,<a name="line.229"></a> |
| <FONT color="green">230</FONT> * variable, function and <code>QName</code> resolution and return type conversion.</p><a name="line.230"></a> |
| <FONT color="green">231</FONT> *<a name="line.231"></a> |
| <FONT color="green">232</FONT> * <p>If <code>returnType</code> is not one of the types defined in {@link XPathConstants} (<a name="line.232"></a> |
| <FONT color="green">233</FONT> * {@link XPathConstants#NUMBER NUMBER},<a name="line.233"></a> |
| <FONT color="green">234</FONT> * {@link XPathConstants#STRING STRING},<a name="line.234"></a> |
| <FONT color="green">235</FONT> * {@link XPathConstants#BOOLEAN BOOLEAN},<a name="line.235"></a> |
| <FONT color="green">236</FONT> * {@link XPathConstants#NODE NODE} or<a name="line.236"></a> |
| <FONT color="green">237</FONT> * {@link XPathConstants#NODESET NODESET})<a name="line.237"></a> |
| <FONT color="green">238</FONT> * then an <code>IllegalArgumentException</code> is thrown.</p><a name="line.238"></a> |
| <FONT color="green">239</FONT> *<a name="line.239"></a> |
| <FONT color="green">240</FONT> * <p>If a <code>null</code> value is provided for<a name="line.240"></a> |
| <FONT color="green">241</FONT> * <code>item</code>, an empty document will be used for the<a name="line.241"></a> |
| <FONT color="green">242</FONT> * context.<a name="line.242"></a> |
| <FONT color="green">243</FONT> * If <code>expression</code> or <code>returnType</code> is <code>null</code>, then a<a name="line.243"></a> |
| <FONT color="green">244</FONT> * <code>NullPointerException</code> is thrown.</p><a name="line.244"></a> |
| <FONT color="green">245</FONT> *<a name="line.245"></a> |
| <FONT color="green">246</FONT> * @param expression The XPath expression.<a name="line.246"></a> |
| <FONT color="green">247</FONT> * @param item The starting context (node or node list, for example).<a name="line.247"></a> |
| <FONT color="green">248</FONT> * @param returnType The desired return type.<a name="line.248"></a> |
| <FONT color="green">249</FONT> *<a name="line.249"></a> |
| <FONT color="green">250</FONT> * @return Result of evaluating an XPath expression as an <code>Object</code> of <code>returnType</code>.<a name="line.250"></a> |
| <FONT color="green">251</FONT> *<a name="line.251"></a> |
| <FONT color="green">252</FONT> * @throws XPathExpressionException If <code>expression</code> cannot be evaluated.<a name="line.252"></a> |
| <FONT color="green">253</FONT> * @throws IllegalArgumentException If <code>returnType</code> is not one of the types defined in {@link XPathConstants}.<a name="line.253"></a> |
| <FONT color="green">254</FONT> * @throws NullPointerException If <code>expression</code> or <code>returnType</code> is <code>null</code>.<a name="line.254"></a> |
| <FONT color="green">255</FONT> */<a name="line.255"></a> |
| <FONT color="green">256</FONT> public Object evaluate(String expression, Object item, QName returnType)<a name="line.256"></a> |
| <FONT color="green">257</FONT> throws XPathExpressionException {<a name="line.257"></a> |
| <FONT color="green">258</FONT> if ( expression == null ) {<a name="line.258"></a> |
| <FONT color="green">259</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.259"></a> |
| <FONT color="green">260</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.260"></a> |
| <FONT color="green">261</FONT> new Object[] {"XPath expression"} );<a name="line.261"></a> |
| <FONT color="green">262</FONT> throw new NullPointerException ( fmsg );<a name="line.262"></a> |
| <FONT color="green">263</FONT> }<a name="line.263"></a> |
| <FONT color="green">264</FONT> if ( returnType == null ) {<a name="line.264"></a> |
| <FONT color="green">265</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.265"></a> |
| <FONT color="green">266</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.266"></a> |
| <FONT color="green">267</FONT> new Object[] {"returnType"} );<a name="line.267"></a> |
| <FONT color="green">268</FONT> throw new NullPointerException ( fmsg );<a name="line.268"></a> |
| <FONT color="green">269</FONT> }<a name="line.269"></a> |
| <FONT color="green">270</FONT> // Checking if requested returnType is supported. returnType need to<a name="line.270"></a> |
| <FONT color="green">271</FONT> // be defined in XPathConstants<a name="line.271"></a> |
| <FONT color="green">272</FONT> if ( !isSupported ( returnType ) ) {<a name="line.272"></a> |
| <FONT color="green">273</FONT> String fmsg = XSLMessages.createXPATHMessage(<a name="line.273"></a> |
| <FONT color="green">274</FONT> XPATHErrorResources.ER_UNSUPPORTED_RETURN_TYPE,<a name="line.274"></a> |
| <FONT color="green">275</FONT> new Object[] { returnType.toString() } );<a name="line.275"></a> |
| <FONT color="green">276</FONT> throw new IllegalArgumentException ( fmsg );<a name="line.276"></a> |
| <FONT color="green">277</FONT> }<a name="line.277"></a> |
| <FONT color="green">278</FONT> <a name="line.278"></a> |
| <FONT color="green">279</FONT> try {<a name="line.279"></a> |
| <FONT color="green">280</FONT> <a name="line.280"></a> |
| <FONT color="green">281</FONT> XObject resultObject = eval( expression, item );<a name="line.281"></a> |
| <FONT color="green">282</FONT> return getResultAsType( resultObject, returnType );<a name="line.282"></a> |
| <FONT color="green">283</FONT> } catch ( java.lang.NullPointerException npe ) {<a name="line.283"></a> |
| <FONT color="green">284</FONT> // If VariableResolver returns null Or if we get <a name="line.284"></a> |
| <FONT color="green">285</FONT> // NullPointerException at this stage for some other reason<a name="line.285"></a> |
| <FONT color="green">286</FONT> // then we have to reurn XPathException <a name="line.286"></a> |
| <FONT color="green">287</FONT> throw new XPathExpressionException ( npe );<a name="line.287"></a> |
| <FONT color="green">288</FONT> } catch ( javax.xml.transform.TransformerException te ) {<a name="line.288"></a> |
| <FONT color="green">289</FONT> Throwable nestedException = te.getException();<a name="line.289"></a> |
| <FONT color="green">290</FONT> if ( nestedException instanceof javax.xml.xpath.XPathFunctionException ) {<a name="line.290"></a> |
| <FONT color="green">291</FONT> throw (javax.xml.xpath.XPathFunctionException)nestedException;<a name="line.291"></a> |
| <FONT color="green">292</FONT> } else {<a name="line.292"></a> |
| <FONT color="green">293</FONT> // For any other exceptions we need to throw <a name="line.293"></a> |
| <FONT color="green">294</FONT> // XPathExpressionException ( as per spec )<a name="line.294"></a> |
| <FONT color="green">295</FONT> throw new XPathExpressionException ( te );<a name="line.295"></a> |
| <FONT color="green">296</FONT> }<a name="line.296"></a> |
| <FONT color="green">297</FONT> } <a name="line.297"></a> |
| <FONT color="green">298</FONT> <a name="line.298"></a> |
| <FONT color="green">299</FONT> }<a name="line.299"></a> |
| <FONT color="green">300</FONT> <a name="line.300"></a> |
| <FONT color="green">301</FONT> private boolean isSupported( QName returnType ) {<a name="line.301"></a> |
| <FONT color="green">302</FONT> if ( ( returnType.equals( XPathConstants.STRING ) ) ||<a name="line.302"></a> |
| <FONT color="green">303</FONT> ( returnType.equals( XPathConstants.NUMBER ) ) ||<a name="line.303"></a> |
| <FONT color="green">304</FONT> ( returnType.equals( XPathConstants.BOOLEAN ) ) ||<a name="line.304"></a> |
| <FONT color="green">305</FONT> ( returnType.equals( XPathConstants.NODE ) ) ||<a name="line.305"></a> |
| <FONT color="green">306</FONT> ( returnType.equals( XPathConstants.NODESET ) ) ) {<a name="line.306"></a> |
| <FONT color="green">307</FONT> <a name="line.307"></a> |
| <FONT color="green">308</FONT> return true;<a name="line.308"></a> |
| <FONT color="green">309</FONT> }<a name="line.309"></a> |
| <FONT color="green">310</FONT> return false;<a name="line.310"></a> |
| <FONT color="green">311</FONT> }<a name="line.311"></a> |
| <FONT color="green">312</FONT> <a name="line.312"></a> |
| <FONT color="green">313</FONT> private Object getResultAsType( XObject resultObject, QName returnType )<a name="line.313"></a> |
| <FONT color="green">314</FONT> throws javax.xml.transform.TransformerException {<a name="line.314"></a> |
| <FONT color="green">315</FONT> // XPathConstants.STRING<a name="line.315"></a> |
| <FONT color="green">316</FONT> if ( returnType.equals( XPathConstants.STRING ) ) { <a name="line.316"></a> |
| <FONT color="green">317</FONT> return resultObject.str();<a name="line.317"></a> |
| <FONT color="green">318</FONT> }<a name="line.318"></a> |
| <FONT color="green">319</FONT> // XPathConstants.NUMBER<a name="line.319"></a> |
| <FONT color="green">320</FONT> if ( returnType.equals( XPathConstants.NUMBER ) ) { <a name="line.320"></a> |
| <FONT color="green">321</FONT> return new Double ( resultObject.num());<a name="line.321"></a> |
| <FONT color="green">322</FONT> }<a name="line.322"></a> |
| <FONT color="green">323</FONT> // XPathConstants.BOOLEAN<a name="line.323"></a> |
| <FONT color="green">324</FONT> if ( returnType.equals( XPathConstants.BOOLEAN ) ) { <a name="line.324"></a> |
| <FONT color="green">325</FONT> return resultObject.bool() ? Boolean.TRUE : Boolean.FALSE;<a name="line.325"></a> |
| <FONT color="green">326</FONT> }<a name="line.326"></a> |
| <FONT color="green">327</FONT> // XPathConstants.NODESET ---ORdered, UNOrdered???<a name="line.327"></a> |
| <FONT color="green">328</FONT> if ( returnType.equals( XPathConstants.NODESET ) ) { <a name="line.328"></a> |
| <FONT color="green">329</FONT> return resultObject.nodelist();<a name="line.329"></a> |
| <FONT color="green">330</FONT> }<a name="line.330"></a> |
| <FONT color="green">331</FONT> // XPathConstants.NODE<a name="line.331"></a> |
| <FONT color="green">332</FONT> if ( returnType.equals( XPathConstants.NODE ) ) { <a name="line.332"></a> |
| <FONT color="green">333</FONT> NodeIterator ni = resultObject.nodeset(); <a name="line.333"></a> |
| <FONT color="green">334</FONT> //Return the first node, or null<a name="line.334"></a> |
| <FONT color="green">335</FONT> return ni.nextNode();<a name="line.335"></a> |
| <FONT color="green">336</FONT> }<a name="line.336"></a> |
| <FONT color="green">337</FONT> String fmsg = XSLMessages.createXPATHMessage(<a name="line.337"></a> |
| <FONT color="green">338</FONT> XPATHErrorResources.ER_UNSUPPORTED_RETURN_TYPE,<a name="line.338"></a> |
| <FONT color="green">339</FONT> new Object[] { returnType.toString()});<a name="line.339"></a> |
| <FONT color="green">340</FONT> throw new IllegalArgumentException( fmsg );<a name="line.340"></a> |
| <FONT color="green">341</FONT> }<a name="line.341"></a> |
| <FONT color="green">342</FONT> <a name="line.342"></a> |
| <FONT color="green">343</FONT> <a name="line.343"></a> |
| <FONT color="green">344</FONT> <a name="line.344"></a> |
| <FONT color="green">345</FONT> /**<a name="line.345"></a> |
| <FONT color="green">346</FONT> * <p>Evaluate an XPath expression in the specified context and return the result as a <code>String</code>.</p><a name="line.346"></a> |
| <FONT color="green">347</FONT> *<a name="line.347"></a> |
| <FONT color="green">348</FONT> * <p>This method calls {@link #evaluate(String expression, Object item, QName returnType)} with a <code>returnType</code> of<a name="line.348"></a> |
| <FONT color="green">349</FONT> * {@link XPathConstants#STRING}.</p><a name="line.349"></a> |
| <FONT color="green">350</FONT> *<a name="line.350"></a> |
| <FONT color="green">351</FONT> * <p>See "Evaluation of XPath Expressions" of JAXP 1.3 spec <a name="line.351"></a> |
| <FONT color="green">352</FONT> * for context item evaluation,<a name="line.352"></a> |
| <FONT color="green">353</FONT> * variable, function and QName resolution and return type conversion.</p><a name="line.353"></a> |
| <FONT color="green">354</FONT> *<a name="line.354"></a> |
| <FONT color="green">355</FONT> * <p>If a <code>null</code> value is provided for<a name="line.355"></a> |
| <FONT color="green">356</FONT> * <code>item</code>, an empty document will be used for the<a name="line.356"></a> |
| <FONT color="green">357</FONT> * context.<a name="line.357"></a> |
| <FONT color="green">358</FONT> * If <code>expression</code> is <code>null</code>, then a <code>NullPointerException</code> is thrown.</p><a name="line.358"></a> |
| <FONT color="green">359</FONT> *<a name="line.359"></a> |
| <FONT color="green">360</FONT> * @param expression The XPath expression.<a name="line.360"></a> |
| <FONT color="green">361</FONT> * @param item The starting context (node or node list, for example).<a name="line.361"></a> |
| <FONT color="green">362</FONT> *<a name="line.362"></a> |
| <FONT color="green">363</FONT> * @return The <code>String</code> that is the result of evaluating the expression and<a name="line.363"></a> |
| <FONT color="green">364</FONT> * converting the result to a <code>String</code>.<a name="line.364"></a> |
| <FONT color="green">365</FONT> *<a name="line.365"></a> |
| <FONT color="green">366</FONT> * @throws XPathExpressionException If <code>expression</code> cannot be evaluated.<a name="line.366"></a> |
| <FONT color="green">367</FONT> * @throws NullPointerException If <code>expression</code> is <code>null</code>.<a name="line.367"></a> |
| <FONT color="green">368</FONT> */<a name="line.368"></a> |
| <FONT color="green">369</FONT> public String evaluate(String expression, Object item)<a name="line.369"></a> |
| <FONT color="green">370</FONT> throws XPathExpressionException {<a name="line.370"></a> |
| <FONT color="green">371</FONT> return (String)this.evaluate( expression, item, XPathConstants.STRING );<a name="line.371"></a> |
| <FONT color="green">372</FONT> }<a name="line.372"></a> |
| <FONT color="green">373</FONT> <a name="line.373"></a> |
| <FONT color="green">374</FONT> /**<a name="line.374"></a> |
| <FONT color="green">375</FONT> * <p>Compile an XPath expression for later evaluation.</p><a name="line.375"></a> |
| <FONT color="green">376</FONT> *<a name="line.376"></a> |
| <FONT color="green">377</FONT> * <p>If <code>expression</code> contains any {@link XPathFunction}s,<a name="line.377"></a> |
| <FONT color="green">378</FONT> * they must be available via the {@link XPathFunctionResolver}.<a name="line.378"></a> |
| <FONT color="green">379</FONT> * An {@link XPathExpressionException} will be thrown if the <code>XPathFunction</code><a name="line.379"></a> |
| <FONT color="green">380</FONT> * cannot be resovled with the <code>XPathFunctionResolver</code>.</p><a name="line.380"></a> |
| <FONT color="green">381</FONT> * <a name="line.381"></a> |
| <FONT color="green">382</FONT> * <p>If <code>expression</code> is <code>null</code>, a <code>NullPointerException</code> is thrown.</p><a name="line.382"></a> |
| <FONT color="green">383</FONT> *<a name="line.383"></a> |
| <FONT color="green">384</FONT> * @param expression The XPath expression.<a name="line.384"></a> |
| <FONT color="green">385</FONT> *<a name="line.385"></a> |
| <FONT color="green">386</FONT> * @return Compiled XPath expression.<a name="line.386"></a> |
| <FONT color="green">387</FONT> <a name="line.387"></a> |
| <FONT color="green">388</FONT> * @throws XPathExpressionException If <code>expression</code> cannot be compiled.<a name="line.388"></a> |
| <FONT color="green">389</FONT> * @throws NullPointerException If <code>expression</code> is <code>null</code>.<a name="line.389"></a> |
| <FONT color="green">390</FONT> */<a name="line.390"></a> |
| <FONT color="green">391</FONT> public XPathExpression compile(String expression)<a name="line.391"></a> |
| <FONT color="green">392</FONT> throws XPathExpressionException {<a name="line.392"></a> |
| <FONT color="green">393</FONT> if ( expression == null ) {<a name="line.393"></a> |
| <FONT color="green">394</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.394"></a> |
| <FONT color="green">395</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.395"></a> |
| <FONT color="green">396</FONT> new Object[] {"XPath expression"} );<a name="line.396"></a> |
| <FONT color="green">397</FONT> throw new NullPointerException ( fmsg );<a name="line.397"></a> |
| <FONT color="green">398</FONT> }<a name="line.398"></a> |
| <FONT color="green">399</FONT> try {<a name="line.399"></a> |
| <FONT color="green">400</FONT> org.apache.xpath.XPath xpath = new XPath (expression, null,<a name="line.400"></a> |
| <FONT color="green">401</FONT> prefixResolver, org.apache.xpath.XPath.SELECT );<a name="line.401"></a> |
| <FONT color="green">402</FONT> // Can have errorListener<a name="line.402"></a> |
| <FONT color="green">403</FONT> XPathExpressionImpl ximpl = new XPathExpressionImpl (xpath,<a name="line.403"></a> |
| <FONT color="green">404</FONT> prefixResolver, functionResolver, variableResolver,<a name="line.404"></a> |
| <FONT color="green">405</FONT> featureSecureProcessing );<a name="line.405"></a> |
| <FONT color="green">406</FONT> return ximpl;<a name="line.406"></a> |
| <FONT color="green">407</FONT> } catch ( javax.xml.transform.TransformerException te ) {<a name="line.407"></a> |
| <FONT color="green">408</FONT> throw new XPathExpressionException ( te ) ;<a name="line.408"></a> |
| <FONT color="green">409</FONT> }<a name="line.409"></a> |
| <FONT color="green">410</FONT> }<a name="line.410"></a> |
| <FONT color="green">411</FONT> <a name="line.411"></a> |
| <FONT color="green">412</FONT> <a name="line.412"></a> |
| <FONT color="green">413</FONT> /**<a name="line.413"></a> |
| <FONT color="green">414</FONT> * <p>Evaluate an XPath expression in the context of the specified <code>InputSource</code><a name="line.414"></a> |
| <FONT color="green">415</FONT> * and return the result as the specified type.</p><a name="line.415"></a> |
| <FONT color="green">416</FONT> *<a name="line.416"></a> |
| <FONT color="green">417</FONT> * <p>This method builds a data model for the {@link InputSource} and calls<a name="line.417"></a> |
| <FONT color="green">418</FONT> * {@link #evaluate(String expression, Object item, QName returnType)} on the resulting document object.</p><a name="line.418"></a> |
| <FONT color="green">419</FONT> *<a name="line.419"></a> |
| <FONT color="green">420</FONT> * <p>See "Evaluation of XPath Expressions" section of JAXP 1.3 spec <a name="line.420"></a> |
| <FONT color="green">421</FONT> * for context item evaluation,<a name="line.421"></a> |
| <FONT color="green">422</FONT> * variable, function and QName resolution and return type conversion.</p><a name="line.422"></a> |
| <FONT color="green">423</FONT> *<a name="line.423"></a> |
| <FONT color="green">424</FONT> * <p>If <code>returnType</code> is not one of the types defined in {@link XPathConstants},<a name="line.424"></a> |
| <FONT color="green">425</FONT> * then an <code>IllegalArgumentException</code> is thrown.</p><a name="line.425"></a> |
| <FONT color="green">426</FONT> *<a name="line.426"></a> |
| <FONT color="green">427</FONT> * <p>If <code>expression</code>, <code>source</code> or <code>returnType</code> is <code>null</code>,<a name="line.427"></a> |
| <FONT color="green">428</FONT> * then a <code>NullPointerException</code> is thrown.</p><a name="line.428"></a> |
| <FONT color="green">429</FONT> *<a name="line.429"></a> |
| <FONT color="green">430</FONT> * @param expression The XPath expression.<a name="line.430"></a> |
| <FONT color="green">431</FONT> * @param source The input source of the document to evaluate over.<a name="line.431"></a> |
| <FONT color="green">432</FONT> * @param returnType The desired return type.<a name="line.432"></a> |
| <FONT color="green">433</FONT> *<a name="line.433"></a> |
| <FONT color="green">434</FONT> * @return The <code>Object</code> that encapsulates the result of evaluating the expression.<a name="line.434"></a> |
| <FONT color="green">435</FONT> *<a name="line.435"></a> |
| <FONT color="green">436</FONT> * @throws XPathExpressionException If expression cannot be evaluated.<a name="line.436"></a> |
| <FONT color="green">437</FONT> * @throws IllegalArgumentException If <code>returnType</code> is not one of the types defined in {@link XPathConstants}.<a name="line.437"></a> |
| <FONT color="green">438</FONT> * @throws NullPointerException If <code>expression</code>, <code>source</code> or <code>returnType</code><a name="line.438"></a> |
| <FONT color="green">439</FONT> * is <code>null</code>.<a name="line.439"></a> |
| <FONT color="green">440</FONT> */<a name="line.440"></a> |
| <FONT color="green">441</FONT> public Object evaluate(String expression, InputSource source, <a name="line.441"></a> |
| <FONT color="green">442</FONT> QName returnType) throws XPathExpressionException {<a name="line.442"></a> |
| <FONT color="green">443</FONT> // Checking validity of different parameters<a name="line.443"></a> |
| <FONT color="green">444</FONT> if( source== null ) {<a name="line.444"></a> |
| <FONT color="green">445</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.445"></a> |
| <FONT color="green">446</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.446"></a> |
| <FONT color="green">447</FONT> new Object[] {"source"} );<a name="line.447"></a> |
| <FONT color="green">448</FONT> throw new NullPointerException ( fmsg );<a name="line.448"></a> |
| <FONT color="green">449</FONT> }<a name="line.449"></a> |
| <FONT color="green">450</FONT> if ( expression == null ) {<a name="line.450"></a> |
| <FONT color="green">451</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.451"></a> |
| <FONT color="green">452</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.452"></a> |
| <FONT color="green">453</FONT> new Object[] {"XPath expression"} );<a name="line.453"></a> |
| <FONT color="green">454</FONT> throw new NullPointerException ( fmsg );<a name="line.454"></a> |
| <FONT color="green">455</FONT> }<a name="line.455"></a> |
| <FONT color="green">456</FONT> if ( returnType == null ) {<a name="line.456"></a> |
| <FONT color="green">457</FONT> String fmsg = XSLMessages.createXPATHMessage( <a name="line.457"></a> |
| <FONT color="green">458</FONT> XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,<a name="line.458"></a> |
| <FONT color="green">459</FONT> new Object[] {"returnType"} );<a name="line.459"></a> |
| <FONT color="green">460</FONT> throw new NullPointerException ( fmsg );<a name="line.460"></a> |
| <FONT color="green">461</FONT> }<a name="line.461"></a> |
| <FONT color="green">462</FONT> <a name="line.462"></a> |
| <FONT color="green">463</FONT> //Checking if requested returnType is supported. <a name="line.463"></a> |
| <FONT color="green">464</FONT> //returnType need to be defined in XPathConstants<a name="line.464"></a> |
| <FONT color="green">465</FONT> if ( !isSupported ( returnType ) ) {<a name="line.465"></a> |
| <FONT color="green">466</FONT> String fmsg = XSLMessages.createXPATHMessage(<a name="line.466"></a> |
| <FONT color="green">467</FONT> XPATHErrorResources.ER_UNSUPPORTED_RETURN_TYPE,<a name="line.467"></a> |
| <FONT color="green">468</FONT> new Object[] { returnType.toString() } );<a name="line.468"></a> |
| <FONT color="green">469</FONT> throw new IllegalArgumentException ( fmsg );<a name="line.469"></a> |
| <FONT color="green">470</FONT> }<a name="line.470"></a> |
| <FONT color="green">471</FONT> <a name="line.471"></a> |
| <FONT color="green">472</FONT> try {<a name="line.472"></a> |
| <FONT color="green">473</FONT> <a name="line.473"></a> |
| <FONT color="green">474</FONT> Document document = getParser().parse( source );<a name="line.474"></a> |
| <FONT color="green">475</FONT> <a name="line.475"></a> |
| <FONT color="green">476</FONT> XObject resultObject = eval( expression, document );<a name="line.476"></a> |
| <FONT color="green">477</FONT> return getResultAsType( resultObject, returnType );<a name="line.477"></a> |
| <FONT color="green">478</FONT> } catch ( SAXException e ) {<a name="line.478"></a> |
| <FONT color="green">479</FONT> throw new XPathExpressionException ( e );<a name="line.479"></a> |
| <FONT color="green">480</FONT> } catch( IOException e ) {<a name="line.480"></a> |
| <FONT color="green">481</FONT> throw new XPathExpressionException ( e ); <a name="line.481"></a> |
| <FONT color="green">482</FONT> } catch ( javax.xml.transform.TransformerException te ) {<a name="line.482"></a> |
| <FONT color="green">483</FONT> Throwable nestedException = te.getException();<a name="line.483"></a> |
| <FONT color="green">484</FONT> if ( nestedException instanceof javax.xml.xpath.XPathFunctionException ) {<a name="line.484"></a> |
| <FONT color="green">485</FONT> throw (javax.xml.xpath.XPathFunctionException)nestedException;<a name="line.485"></a> |
| <FONT color="green">486</FONT> } else {<a name="line.486"></a> |
| <FONT color="green">487</FONT> throw new XPathExpressionException ( te );<a name="line.487"></a> |
| <FONT color="green">488</FONT> }<a name="line.488"></a> |
| <FONT color="green">489</FONT> }<a name="line.489"></a> |
| <FONT color="green">490</FONT> <a name="line.490"></a> |
| <FONT color="green">491</FONT> } <a name="line.491"></a> |
| <FONT color="green">492</FONT> <a name="line.492"></a> |
| <FONT color="green">493</FONT> <a name="line.493"></a> |
| <FONT color="green">494</FONT> <a name="line.494"></a> |
| <FONT color="green">495</FONT> <a name="line.495"></a> |
| <FONT color="green">496</FONT> /**<a name="line.496"></a> |
| <FONT color="green">497</FONT> * <p>Evaluate an XPath expression in the context of the specified <code>InputSource</code><a name="line.497"></a> |
| <FONT color="green">498</FONT> * and return the result as a <code>String</code>.</p><a name="line.498"></a> |
| <FONT color="green">499</FONT> *<a name="line.499"></a> |
| <FONT color="green">500</FONT> * <p>This method calls {@link #evaluate(String expression, InputSource source, QName returnType)} with a<a name="line.500"></a> |
| <FONT color="green">501</FONT> * <code>returnType</code> of {@link XPathConstants#STRING}.</p><a name="line.501"></a> |
| <FONT color="green">502</FONT> *<a name="line.502"></a> |
| <FONT color="green">503</FONT> * <p>See "Evaluation of XPath Expressions" section of JAXP 1.3 spec<a name="line.503"></a> |
| <FONT color="green">504</FONT> * for context item evaluation,<a name="line.504"></a> |
| <FONT color="green">505</FONT> * variable, function and QName resolution and return type conversion.</p><a name="line.505"></a> |
| <FONT color="green">506</FONT> *<a name="line.506"></a> |
| <FONT color="green">507</FONT> * <p>If <code>expression</code> or <code>source</code> is <code>null</code>,<a name="line.507"></a> |
| <FONT color="green">508</FONT> * then a <code>NullPointerException</code> is thrown.</p><a name="line.508"></a> |
| <FONT color="green">509</FONT> *<a name="line.509"></a> |
| <FONT color="green">510</FONT> * @param expression The XPath expression.<a name="line.510"></a> |
| <FONT color="green">511</FONT> * @param source The <code>InputSource</code> of the document to evaluate over.<a name="line.511"></a> |
| <FONT color="green">512</FONT> *<a name="line.512"></a> |
| <FONT color="green">513</FONT> * @return The <code>String</code> that is the result of evaluating the expression and<a name="line.513"></a> |
| <FONT color="green">514</FONT> * converting the result to a <code>String</code>.<a name="line.514"></a> |
| <FONT color="green">515</FONT> *<a name="line.515"></a> |
| <FONT color="green">516</FONT> * @throws XPathExpressionException If expression cannot be evaluated.<a name="line.516"></a> |
| <FONT color="green">517</FONT> * @throws NullPointerException If <code>expression</code> or <code>source</code> is <code>null</code>.<a name="line.517"></a> |
| <FONT color="green">518</FONT> */<a name="line.518"></a> |
| <FONT color="green">519</FONT> public String evaluate(String expression, InputSource source)<a name="line.519"></a> |
| <FONT color="green">520</FONT> throws XPathExpressionException {<a name="line.520"></a> |
| <FONT color="green">521</FONT> return (String)this.evaluate( expression, source, XPathConstants.STRING );<a name="line.521"></a> |
| <FONT color="green">522</FONT> }<a name="line.522"></a> |
| <FONT color="green">523</FONT> <a name="line.523"></a> |
| <FONT color="green">524</FONT> /**<a name="line.524"></a> |
| <FONT color="green">525</FONT> * <p>Reset this <code>XPath</code> to its original configuration.</p><a name="line.525"></a> |
| <FONT color="green">526</FONT> *<a name="line.526"></a> |
| <FONT color="green">527</FONT> * <p><code>XPath</code> is reset to the same state as when it was created with<a name="line.527"></a> |
| <FONT color="green">528</FONT> * {@link XPathFactory#newXPath()}.<a name="line.528"></a> |
| <FONT color="green">529</FONT> * <code>reset()</code> is designed to allow the reuse of existing <code>XPath</code>s<a name="line.529"></a> |
| <FONT color="green">530</FONT> * thus saving resources associated with the creation of new <code>XPath</code>s.</p><a name="line.530"></a> |
| <FONT color="green">531</FONT> *<a name="line.531"></a> |
| <FONT color="green">532</FONT> * <p>The reset <code>XPath</code> is not guaranteed to have the same<a name="line.532"></a> |
| <FONT color="green">533</FONT> * {@link XPathFunctionResolver}, {@link XPathVariableResolver}<a name="line.533"></a> |
| <FONT color="green">534</FONT> * or {@link NamespaceContext} <code>Object</code>s, e.g. {@link Object#equals(Object obj)}.<a name="line.534"></a> |
| <FONT color="green">535</FONT> * It is guaranteed to have a functionally equal <code>XPathFunctionResolver</code>,<a name="line.535"></a> |
| <FONT color="green">536</FONT> * <code>XPathVariableResolver</code><a name="line.536"></a> |
| <FONT color="green">537</FONT> * and <code>NamespaceContext</code>.</p><a name="line.537"></a> |
| <FONT color="green">538</FONT> */<a name="line.538"></a> |
| <FONT color="green">539</FONT> public void reset() {<a name="line.539"></a> |
| <FONT color="green">540</FONT> this.variableResolver = this.origVariableResolver;<a name="line.540"></a> |
| <FONT color="green">541</FONT> this.functionResolver = this.origFunctionResolver;<a name="line.541"></a> |
| <FONT color="green">542</FONT> this.namespaceContext = null;<a name="line.542"></a> |
| <FONT color="green">543</FONT> }<a name="line.543"></a> |
| <FONT color="green">544</FONT> <a name="line.544"></a> |
| <FONT color="green">545</FONT> }<a name="line.545"></a> |
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