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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: ParentLocationPath.java 468650 2006-10-28 07:03:30Z minchau $<a name="line.19"></a>
<FONT color="green">020</FONT> */<a name="line.20"></a>
<FONT color="green">021</FONT> <a name="line.21"></a>
<FONT color="green">022</FONT> package org.apache.xalan.xsltc.compiler;<a name="line.22"></a>
<FONT color="green">023</FONT> <a name="line.23"></a>
<FONT color="green">024</FONT> import org.apache.bcel.generic.ALOAD;<a name="line.24"></a>
<FONT color="green">025</FONT> import org.apache.bcel.generic.ASTORE;<a name="line.25"></a>
<FONT color="green">026</FONT> import org.apache.bcel.generic.ConstantPoolGen;<a name="line.26"></a>
<FONT color="green">027</FONT> import org.apache.bcel.generic.INVOKEINTERFACE;<a name="line.27"></a>
<FONT color="green">028</FONT> import org.apache.bcel.generic.INVOKESPECIAL;<a name="line.28"></a>
<FONT color="green">029</FONT> import org.apache.bcel.generic.INVOKEVIRTUAL;<a name="line.29"></a>
<FONT color="green">030</FONT> import org.apache.bcel.generic.InstructionList;<a name="line.30"></a>
<FONT color="green">031</FONT> import org.apache.bcel.generic.LocalVariableGen;<a name="line.31"></a>
<FONT color="green">032</FONT> import org.apache.bcel.generic.NEW;<a name="line.32"></a>
<FONT color="green">033</FONT> import org.apache.xalan.xsltc.compiler.util.ClassGenerator;<a name="line.33"></a>
<FONT color="green">034</FONT> import org.apache.xalan.xsltc.compiler.util.MethodGenerator;<a name="line.34"></a>
<FONT color="green">035</FONT> import org.apache.xalan.xsltc.compiler.util.Type;<a name="line.35"></a>
<FONT color="green">036</FONT> import org.apache.xalan.xsltc.compiler.util.TypeCheckError;<a name="line.36"></a>
<FONT color="green">037</FONT> import org.apache.xalan.xsltc.compiler.util.Util;<a name="line.37"></a>
<FONT color="green">038</FONT> import org.apache.xml.dtm.Axis;<a name="line.38"></a>
<FONT color="green">039</FONT> import org.apache.xml.dtm.DTM;<a name="line.39"></a>
<FONT color="green">040</FONT> <a name="line.40"></a>
<FONT color="green">041</FONT> /**<a name="line.41"></a>
<FONT color="green">042</FONT> * @author Jacek Ambroziak<a name="line.42"></a>
<FONT color="green">043</FONT> * @author Santiago Pericas-Geertsen<a name="line.43"></a>
<FONT color="green">044</FONT> */<a name="line.44"></a>
<FONT color="green">045</FONT> final class ParentLocationPath extends RelativeLocationPath {<a name="line.45"></a>
<FONT color="green">046</FONT> private Expression _step;<a name="line.46"></a>
<FONT color="green">047</FONT> private final RelativeLocationPath _path;<a name="line.47"></a>
<FONT color="green">048</FONT> private Type stype;<a name="line.48"></a>
<FONT color="green">049</FONT> private boolean _orderNodes = false;<a name="line.49"></a>
<FONT color="green">050</FONT> private boolean _axisMismatch = false;<a name="line.50"></a>
<FONT color="green">051</FONT> <a name="line.51"></a>
<FONT color="green">052</FONT> public ParentLocationPath(RelativeLocationPath path, Expression step) {<a name="line.52"></a>
<FONT color="green">053</FONT> _path = path;<a name="line.53"></a>
<FONT color="green">054</FONT> _step = step;<a name="line.54"></a>
<FONT color="green">055</FONT> _path.setParent(this);<a name="line.55"></a>
<FONT color="green">056</FONT> _step.setParent(this);<a name="line.56"></a>
<FONT color="green">057</FONT> <a name="line.57"></a>
<FONT color="green">058</FONT> if (_step instanceof Step) {<a name="line.58"></a>
<FONT color="green">059</FONT> _axisMismatch = checkAxisMismatch();<a name="line.59"></a>
<FONT color="green">060</FONT> }<a name="line.60"></a>
<FONT color="green">061</FONT> }<a name="line.61"></a>
<FONT color="green">062</FONT> <a name="line.62"></a>
<FONT color="green">063</FONT> public void setAxis(int axis) {<a name="line.63"></a>
<FONT color="green">064</FONT> _path.setAxis(axis);<a name="line.64"></a>
<FONT color="green">065</FONT> }<a name="line.65"></a>
<FONT color="green">066</FONT> <a name="line.66"></a>
<FONT color="green">067</FONT> public int getAxis() {<a name="line.67"></a>
<FONT color="green">068</FONT> return _path.getAxis();<a name="line.68"></a>
<FONT color="green">069</FONT> }<a name="line.69"></a>
<FONT color="green">070</FONT> <a name="line.70"></a>
<FONT color="green">071</FONT> public RelativeLocationPath getPath() {<a name="line.71"></a>
<FONT color="green">072</FONT> return(_path);<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>
<FONT color="green">075</FONT> public Expression getStep() {<a name="line.75"></a>
<FONT color="green">076</FONT> return(_step);<a name="line.76"></a>
<FONT color="green">077</FONT> }<a name="line.77"></a>
<FONT color="green">078</FONT> <a name="line.78"></a>
<FONT color="green">079</FONT> public void setParser(Parser parser) {<a name="line.79"></a>
<FONT color="green">080</FONT> super.setParser(parser);<a name="line.80"></a>
<FONT color="green">081</FONT> _step.setParser(parser);<a name="line.81"></a>
<FONT color="green">082</FONT> _path.setParser(parser);<a name="line.82"></a>
<FONT color="green">083</FONT> }<a name="line.83"></a>
<FONT color="green">084</FONT> <a name="line.84"></a>
<FONT color="green">085</FONT> public String toString() {<a name="line.85"></a>
<FONT color="green">086</FONT> return "ParentLocationPath(" + _path + ", " + _step + ')';<a name="line.86"></a>
<FONT color="green">087</FONT> }<a name="line.87"></a>
<FONT color="green">088</FONT> <a name="line.88"></a>
<FONT color="green">089</FONT> public Type typeCheck(SymbolTable stable) throws TypeCheckError {<a name="line.89"></a>
<FONT color="green">090</FONT> stype = _step.typeCheck(stable);<a name="line.90"></a>
<FONT color="green">091</FONT> _path.typeCheck(stable);<a name="line.91"></a>
<FONT color="green">092</FONT> <a name="line.92"></a>
<FONT color="green">093</FONT> if (_axisMismatch) enableNodeOrdering();<a name="line.93"></a>
<FONT color="green">094</FONT> <a name="line.94"></a>
<FONT color="green">095</FONT> return _type = Type.NodeSet; <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> public void enableNodeOrdering() {<a name="line.98"></a>
<FONT color="green">099</FONT> SyntaxTreeNode parent = getParent();<a name="line.99"></a>
<FONT color="green">100</FONT> if (parent instanceof ParentLocationPath)<a name="line.100"></a>
<FONT color="green">101</FONT> ((ParentLocationPath)parent).enableNodeOrdering();<a name="line.101"></a>
<FONT color="green">102</FONT> else {<a name="line.102"></a>
<FONT color="green">103</FONT> _orderNodes = true;<a name="line.103"></a>
<FONT color="green">104</FONT> }<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> * This method is used to determine if this parent location path is a<a name="line.108"></a>
<FONT color="green">109</FONT> * combination of two step's with axes that will create duplicate or<a name="line.109"></a>
<FONT color="green">110</FONT> * unordered nodes.<a name="line.110"></a>
<FONT color="green">111</FONT> */<a name="line.111"></a>
<FONT color="green">112</FONT> public boolean checkAxisMismatch() {<a name="line.112"></a>
<FONT color="green">113</FONT> <a name="line.113"></a>
<FONT color="green">114</FONT> int left = _path.getAxis();<a name="line.114"></a>
<FONT color="green">115</FONT> int right = ((Step)_step).getAxis();<a name="line.115"></a>
<FONT color="green">116</FONT> <a name="line.116"></a>
<FONT color="green">117</FONT> if (((left == Axis.ANCESTOR) || (left == Axis.ANCESTORORSELF)) &amp;&amp;<a name="line.117"></a>
<FONT color="green">118</FONT> ((right == Axis.CHILD) ||<a name="line.118"></a>
<FONT color="green">119</FONT> (right == Axis.DESCENDANT) ||<a name="line.119"></a>
<FONT color="green">120</FONT> (right == Axis.DESCENDANTORSELF) ||<a name="line.120"></a>
<FONT color="green">121</FONT> (right == Axis.PARENT) ||<a name="line.121"></a>
<FONT color="green">122</FONT> (right == Axis.PRECEDING) ||<a name="line.122"></a>
<FONT color="green">123</FONT> (right == Axis.PRECEDINGSIBLING)))<a name="line.123"></a>
<FONT color="green">124</FONT> return true;<a name="line.124"></a>
<FONT color="green">125</FONT> <a name="line.125"></a>
<FONT color="green">126</FONT> if ((left == Axis.CHILD) &amp;&amp;<a name="line.126"></a>
<FONT color="green">127</FONT> (right == Axis.ANCESTOR) ||<a name="line.127"></a>
<FONT color="green">128</FONT> (right == Axis.ANCESTORORSELF) ||<a name="line.128"></a>
<FONT color="green">129</FONT> (right == Axis.PARENT) ||<a name="line.129"></a>
<FONT color="green">130</FONT> (right == Axis.PRECEDING))<a name="line.130"></a>
<FONT color="green">131</FONT> return true;<a name="line.131"></a>
<FONT color="green">132</FONT> <a name="line.132"></a>
<FONT color="green">133</FONT> if ((left == Axis.DESCENDANT) || (left == Axis.DESCENDANTORSELF))<a name="line.133"></a>
<FONT color="green">134</FONT> return true;<a name="line.134"></a>
<FONT color="green">135</FONT> <a name="line.135"></a>
<FONT color="green">136</FONT> if (((left == Axis.FOLLOWING) || (left == Axis.FOLLOWINGSIBLING)) &amp;&amp;<a name="line.136"></a>
<FONT color="green">137</FONT> ((right == Axis.FOLLOWING) ||<a name="line.137"></a>
<FONT color="green">138</FONT> (right == Axis.PARENT) ||<a name="line.138"></a>
<FONT color="green">139</FONT> (right == Axis.PRECEDING) ||<a name="line.139"></a>
<FONT color="green">140</FONT> (right == Axis.PRECEDINGSIBLING)))<a name="line.140"></a>
<FONT color="green">141</FONT> return true;<a name="line.141"></a>
<FONT color="green">142</FONT> <a name="line.142"></a>
<FONT color="green">143</FONT> if (((left == Axis.PRECEDING) || (left == Axis.PRECEDINGSIBLING)) &amp;&amp;<a name="line.143"></a>
<FONT color="green">144</FONT> ((right == Axis.DESCENDANT) ||<a name="line.144"></a>
<FONT color="green">145</FONT> (right == Axis.DESCENDANTORSELF) ||<a name="line.145"></a>
<FONT color="green">146</FONT> (right == Axis.FOLLOWING) ||<a name="line.146"></a>
<FONT color="green">147</FONT> (right == Axis.FOLLOWINGSIBLING) ||<a name="line.147"></a>
<FONT color="green">148</FONT> (right == Axis.PARENT) ||<a name="line.148"></a>
<FONT color="green">149</FONT> (right == Axis.PRECEDING) ||<a name="line.149"></a>
<FONT color="green">150</FONT> (right == Axis.PRECEDINGSIBLING)))<a name="line.150"></a>
<FONT color="green">151</FONT> return true;<a name="line.151"></a>
<FONT color="green">152</FONT> <a name="line.152"></a>
<FONT color="green">153</FONT> if ((right == Axis.FOLLOWING) &amp;&amp; (left == Axis.CHILD)) {<a name="line.153"></a>
<FONT color="green">154</FONT> // Special case for '@*/following::*' expressions. The resulting<a name="line.154"></a>
<FONT color="green">155</FONT> // iterator is initialised with the parent's first child, and this<a name="line.155"></a>
<FONT color="green">156</FONT> // can cause duplicates in the output if the parent has more than<a name="line.156"></a>
<FONT color="green">157</FONT> // one attribute that matches the left step.<a name="line.157"></a>
<FONT color="green">158</FONT> if (_path instanceof Step) {<a name="line.158"></a>
<FONT color="green">159</FONT> int type = ((Step)_path).getNodeType();<a name="line.159"></a>
<FONT color="green">160</FONT> if (type == DTM.ATTRIBUTE_NODE) return true;<a name="line.160"></a>
<FONT color="green">161</FONT> }<a name="line.161"></a>
<FONT color="green">162</FONT> }<a name="line.162"></a>
<FONT color="green">163</FONT> <a name="line.163"></a>
<FONT color="green">164</FONT> return false;<a name="line.164"></a>
<FONT color="green">165</FONT> }<a name="line.165"></a>
<FONT color="green">166</FONT> <a name="line.166"></a>
<FONT color="green">167</FONT> public void translate(ClassGenerator classGen, MethodGenerator methodGen) {<a name="line.167"></a>
<FONT color="green">168</FONT> final ConstantPoolGen cpg = classGen.getConstantPool();<a name="line.168"></a>
<FONT color="green">169</FONT> final InstructionList il = methodGen.getInstructionList();<a name="line.169"></a>
<FONT color="green">170</FONT> <a name="line.170"></a>
<FONT color="green">171</FONT> // Backwards branches are prohibited if an uninitialized object is<a name="line.171"></a>
<FONT color="green">172</FONT> // on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.<a name="line.172"></a>
<FONT color="green">173</FONT> // We don't know whether this code might contain backwards branches<a name="line.173"></a>
<FONT color="green">174</FONT> // so we mustn't create the new object until after we've created<a name="line.174"></a>
<FONT color="green">175</FONT> // the suspect arguments to its constructor. Instead we calculate<a name="line.175"></a>
<FONT color="green">176</FONT> // the values of the arguments to the constructor first, store them<a name="line.176"></a>
<FONT color="green">177</FONT> // in temporary variables, create the object and reload the<a name="line.177"></a>
<FONT color="green">178</FONT> // arguments from the temporaries to avoid the problem.<a name="line.178"></a>
<FONT color="green">179</FONT> <a name="line.179"></a>
<FONT color="green">180</FONT> // Compile path iterator<a name="line.180"></a>
<FONT color="green">181</FONT> _path.translate(classGen, methodGen); // iterator on stack....<a name="line.181"></a>
<FONT color="green">182</FONT> LocalVariableGen pathTemp<a name="line.182"></a>
<FONT color="green">183</FONT> = methodGen.addLocalVariable("parent_location_path_tmp1",<a name="line.183"></a>
<FONT color="green">184</FONT> Util.getJCRefType(NODE_ITERATOR_SIG),<a name="line.184"></a>
<FONT color="green">185</FONT> null, null);<a name="line.185"></a>
<FONT color="green">186</FONT> pathTemp.setStart(il.append(new ASTORE(pathTemp.getIndex())));<a name="line.186"></a>
<FONT color="green">187</FONT> <a name="line.187"></a>
<FONT color="green">188</FONT> _step.translate(classGen, methodGen);<a name="line.188"></a>
<FONT color="green">189</FONT> LocalVariableGen stepTemp<a name="line.189"></a>
<FONT color="green">190</FONT> = methodGen.addLocalVariable("parent_location_path_tmp2",<a name="line.190"></a>
<FONT color="green">191</FONT> Util.getJCRefType(NODE_ITERATOR_SIG),<a name="line.191"></a>
<FONT color="green">192</FONT> null, null);<a name="line.192"></a>
<FONT color="green">193</FONT> stepTemp.setStart(il.append(new ASTORE(stepTemp.getIndex())));<a name="line.193"></a>
<FONT color="green">194</FONT> <a name="line.194"></a>
<FONT color="green">195</FONT> // Create new StepIterator<a name="line.195"></a>
<FONT color="green">196</FONT> final int initSI = cpg.addMethodref(STEP_ITERATOR_CLASS,<a name="line.196"></a>
<FONT color="green">197</FONT> "&lt;init&gt;",<a name="line.197"></a>
<FONT color="green">198</FONT> "("<a name="line.198"></a>
<FONT color="green">199</FONT> +NODE_ITERATOR_SIG<a name="line.199"></a>
<FONT color="green">200</FONT> +NODE_ITERATOR_SIG<a name="line.200"></a>
<FONT color="green">201</FONT> +")V");<a name="line.201"></a>
<FONT color="green">202</FONT> il.append(new NEW(cpg.addClass(STEP_ITERATOR_CLASS)));<a name="line.202"></a>
<FONT color="green">203</FONT> il.append(DUP);<a name="line.203"></a>
<FONT color="green">204</FONT> <a name="line.204"></a>
<FONT color="green">205</FONT> pathTemp.setEnd(il.append(new ALOAD(pathTemp.getIndex())));<a name="line.205"></a>
<FONT color="green">206</FONT> stepTemp.setEnd(il.append(new ALOAD(stepTemp.getIndex())));<a name="line.206"></a>
<FONT color="green">207</FONT> <a name="line.207"></a>
<FONT color="green">208</FONT> // Initialize StepIterator with iterators from the stack<a name="line.208"></a>
<FONT color="green">209</FONT> il.append(new INVOKESPECIAL(initSI));<a name="line.209"></a>
<FONT color="green">210</FONT> <a name="line.210"></a>
<FONT color="green">211</FONT> // This is a special case for the //* path with or without predicates<a name="line.211"></a>
<FONT color="green">212</FONT> Expression stp = _step;<a name="line.212"></a>
<FONT color="green">213</FONT> if (stp instanceof ParentLocationPath)<a name="line.213"></a>
<FONT color="green">214</FONT> stp = ((ParentLocationPath)stp).getStep();<a name="line.214"></a>
<FONT color="green">215</FONT> <a name="line.215"></a>
<FONT color="green">216</FONT> if ((_path instanceof Step) &amp;&amp; (stp instanceof Step)) {<a name="line.216"></a>
<FONT color="green">217</FONT> final int path = ((Step)_path).getAxis();<a name="line.217"></a>
<FONT color="green">218</FONT> final int step = ((Step)stp).getAxis();<a name="line.218"></a>
<FONT color="green">219</FONT> if ((path == Axis.DESCENDANTORSELF &amp;&amp; step == Axis.CHILD) ||<a name="line.219"></a>
<FONT color="green">220</FONT> (path == Axis.PRECEDING &amp;&amp; step == Axis.PARENT)) {<a name="line.220"></a>
<FONT color="green">221</FONT> final int incl = cpg.addMethodref(NODE_ITERATOR_BASE,<a name="line.221"></a>
<FONT color="green">222</FONT> "includeSelf",<a name="line.222"></a>
<FONT color="green">223</FONT> "()" + NODE_ITERATOR_SIG);<a name="line.223"></a>
<FONT color="green">224</FONT> il.append(new INVOKEVIRTUAL(incl));<a name="line.224"></a>
<FONT color="green">225</FONT> }<a name="line.225"></a>
<FONT color="green">226</FONT> }<a name="line.226"></a>
<FONT color="green">227</FONT> <a name="line.227"></a>
<FONT color="green">228</FONT> /*<a name="line.228"></a>
<FONT color="green">229</FONT> * If this pattern contains a sequence of descendant iterators we<a name="line.229"></a>
<FONT color="green">230</FONT> * run the risk of returning the same node several times. We put<a name="line.230"></a>
<FONT color="green">231</FONT> * a new iterator on top of the existing one to assure node order<a name="line.231"></a>
<FONT color="green">232</FONT> * and prevent returning a single node multiple times.<a name="line.232"></a>
<FONT color="green">233</FONT> */<a name="line.233"></a>
<FONT color="green">234</FONT> if (_orderNodes) {<a name="line.234"></a>
<FONT color="green">235</FONT> final int order = cpg.addInterfaceMethodref(DOM_INTF,<a name="line.235"></a>
<FONT color="green">236</FONT> ORDER_ITERATOR,<a name="line.236"></a>
<FONT color="green">237</FONT> ORDER_ITERATOR_SIG);<a name="line.237"></a>
<FONT color="green">238</FONT> il.append(methodGen.loadDOM());<a name="line.238"></a>
<FONT color="green">239</FONT> il.append(SWAP);<a name="line.239"></a>
<FONT color="green">240</FONT> il.append(methodGen.loadContextNode());<a name="line.240"></a>
<FONT color="green">241</FONT> il.append(new INVOKEINTERFACE(order, 3));<a name="line.241"></a>
<FONT color="green">242</FONT> }<a name="line.242"></a>
<FONT color="green">243</FONT> }<a name="line.243"></a>
<FONT color="green">244</FONT> }<a name="line.244"></a>
</PRE>
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