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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> /*<a name="line.18"></a> |
| <FONT color="green">019</FONT> * $Id: VariableSafeAbsRef.java 468655 2006-10-28 07:12:06Z minchau $<a name="line.19"></a> |
| <FONT color="green">020</FONT> */<a name="line.20"></a> |
| <FONT color="green">021</FONT> package org.apache.xpath.operations;<a name="line.21"></a> |
| <FONT color="green">022</FONT> <a name="line.22"></a> |
| <FONT color="green">023</FONT> import org.apache.xml.dtm.DTMManager;<a name="line.23"></a> |
| <FONT color="green">024</FONT> import org.apache.xpath.Expression;<a name="line.24"></a> |
| <FONT color="green">025</FONT> import org.apache.xpath.XPathContext;<a name="line.25"></a> |
| <FONT color="green">026</FONT> import org.apache.xpath.objects.XNodeSet;<a name="line.26"></a> |
| <FONT color="green">027</FONT> import org.apache.xpath.objects.XObject;<a name="line.27"></a> |
| <FONT color="green">028</FONT> <a name="line.28"></a> |
| <FONT color="green">029</FONT> <a name="line.29"></a> |
| <FONT color="green">030</FONT> /**<a name="line.30"></a> |
| <FONT color="green">031</FONT> * This is a "smart" variable reference that is used in situations where <a name="line.31"></a> |
| <FONT color="green">032</FONT> * an absolute path is optimized into a variable reference, but may <a name="line.32"></a> |
| <FONT color="green">033</FONT> * be used in some situations where the document context may have changed.<a name="line.33"></a> |
| <FONT color="green">034</FONT> * For instance, in select="document(doc/@href)//name[//salary &gt; 7250]", the <a name="line.34"></a> |
| <FONT color="green">035</FONT> * root in the predicate will be different for each node in the set. While <a name="line.35"></a> |
| <FONT color="green">036</FONT> * this is easy to detect statically in this case, in other cases static <a name="line.36"></a> |
| <FONT color="green">037</FONT> * detection would be very hard or impossible. So, this class does a dynamic check <a name="line.37"></a> |
| <FONT color="green">038</FONT> * to make sure the document context of the referenced variable is the same as <a name="line.38"></a> |
| <FONT color="green">039</FONT> * the current document context, and, if it is not, execute the referenced variable's <a name="line.39"></a> |
| <FONT color="green">040</FONT> * expression with the current context instead.<a name="line.40"></a> |
| <FONT color="green">041</FONT> */<a name="line.41"></a> |
| <FONT color="green">042</FONT> public class VariableSafeAbsRef extends Variable<a name="line.42"></a> |
| <FONT color="green">043</FONT> {<a name="line.43"></a> |
| <FONT color="green">044</FONT> static final long serialVersionUID = -9174661990819967452L;<a name="line.44"></a> |
| <FONT color="green">045</FONT> <a name="line.45"></a> |
| <FONT color="green">046</FONT> /**<a name="line.46"></a> |
| <FONT color="green">047</FONT> * Dereference the variable, and return the reference value. Note that lazy <a name="line.47"></a> |
| <FONT color="green">048</FONT> * evaluation will occur. If a variable within scope is not found, a warning <a name="line.48"></a> |
| <FONT color="green">049</FONT> * will be sent to the error listener, and an empty nodeset will be returned.<a name="line.49"></a> |
| <FONT color="green">050</FONT> *<a name="line.50"></a> |
| <FONT color="green">051</FONT> *<a name="line.51"></a> |
| <FONT color="green">052</FONT> * @param xctxt The runtime execution context.<a name="line.52"></a> |
| <FONT color="green">053</FONT> *<a name="line.53"></a> |
| <FONT color="green">054</FONT> * @return The evaluated variable, or an empty nodeset if not found.<a name="line.54"></a> |
| <FONT color="green">055</FONT> *<a name="line.55"></a> |
| <FONT color="green">056</FONT> * @throws javax.xml.transform.TransformerException<a name="line.56"></a> |
| <FONT color="green">057</FONT> */<a name="line.57"></a> |
| <FONT color="green">058</FONT> public XObject execute(XPathContext xctxt, boolean destructiveOK) <a name="line.58"></a> |
| <FONT color="green">059</FONT> throws javax.xml.transform.TransformerException<a name="line.59"></a> |
| <FONT color="green">060</FONT> {<a name="line.60"></a> |
| <FONT color="green">061</FONT> XNodeSet xns = (XNodeSet)super.execute(xctxt, destructiveOK);<a name="line.61"></a> |
| <FONT color="green">062</FONT> DTMManager dtmMgr = xctxt.getDTMManager();<a name="line.62"></a> |
| <FONT color="green">063</FONT> int context = xctxt.getContextNode();<a name="line.63"></a> |
| <FONT color="green">064</FONT> if(dtmMgr.getDTM(xns.getRoot()).getDocument() != <a name="line.64"></a> |
| <FONT color="green">065</FONT> dtmMgr.getDTM(context).getDocument())<a name="line.65"></a> |
| <FONT color="green">066</FONT> {<a name="line.66"></a> |
| <FONT color="green">067</FONT> Expression expr = (Expression)xns.getContainedIter();<a name="line.67"></a> |
| <FONT color="green">068</FONT> xns = (XNodeSet)expr.asIterator(xctxt, context);<a name="line.68"></a> |
| <FONT color="green">069</FONT> }<a name="line.69"></a> |
| <FONT color="green">070</FONT> return xns;<a name="line.70"></a> |
| <FONT color="green">071</FONT> }<a name="line.71"></a> |
| <FONT color="green">072</FONT> <a name="line.72"></a> |
| <FONT color="green">073</FONT> }<a name="line.73"></a> |
| <FONT color="green">074</FONT> <a name="line.74"></a> |
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