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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: UnionPathExpr.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 java.util.Vector;<a name="line.24"></a> |
| <FONT color="green">025</FONT> <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.NEW;<a name="line.31"></a> |
| <FONT color="green">032</FONT> import org.apache.xalan.xsltc.compiler.util.ClassGenerator;<a name="line.32"></a> |
| <FONT color="green">033</FONT> import org.apache.xalan.xsltc.compiler.util.MethodGenerator;<a name="line.33"></a> |
| <FONT color="green">034</FONT> import org.apache.xalan.xsltc.compiler.util.Type;<a name="line.34"></a> |
| <FONT color="green">035</FONT> import org.apache.xalan.xsltc.compiler.util.TypeCheckError;<a name="line.35"></a> |
| <FONT color="green">036</FONT> import org.apache.xml.dtm.Axis;<a name="line.36"></a> |
| <FONT color="green">037</FONT> import org.apache.xml.dtm.DTM;<a name="line.37"></a> |
| <FONT color="green">038</FONT> <a name="line.38"></a> |
| <FONT color="green">039</FONT> /**<a name="line.39"></a> |
| <FONT color="green">040</FONT> * @author Jacek Ambroziak<a name="line.40"></a> |
| <FONT color="green">041</FONT> * @author Santiago Pericas-Geertsen<a name="line.41"></a> |
| <FONT color="green">042</FONT> */<a name="line.42"></a> |
| <FONT color="green">043</FONT> final class UnionPathExpr extends Expression {<a name="line.43"></a> |
| <FONT color="green">044</FONT> <a name="line.44"></a> |
| <FONT color="green">045</FONT> private final Expression _pathExpr;<a name="line.45"></a> |
| <FONT color="green">046</FONT> private final Expression _rest;<a name="line.46"></a> |
| <FONT color="green">047</FONT> private boolean _reverse = false;<a name="line.47"></a> |
| <FONT color="green">048</FONT> <a name="line.48"></a> |
| <FONT color="green">049</FONT> // linearization for top level UnionPathExprs<a name="line.49"></a> |
| <FONT color="green">050</FONT> private Expression[] _components;<a name="line.50"></a> |
| <FONT color="green">051</FONT> <a name="line.51"></a> |
| <FONT color="green">052</FONT> public UnionPathExpr(Expression pathExpr, Expression rest) {<a name="line.52"></a> |
| <FONT color="green">053</FONT> _pathExpr = pathExpr;<a name="line.53"></a> |
| <FONT color="green">054</FONT> _rest = rest;<a name="line.54"></a> |
| <FONT color="green">055</FONT> }<a name="line.55"></a> |
| <FONT color="green">056</FONT> <a name="line.56"></a> |
| <FONT color="green">057</FONT> public void setParser(Parser parser) {<a name="line.57"></a> |
| <FONT color="green">058</FONT> super.setParser(parser);<a name="line.58"></a> |
| <FONT color="green">059</FONT> // find all expressions in this Union<a name="line.59"></a> |
| <FONT color="green">060</FONT> final Vector components = new Vector();<a name="line.60"></a> |
| <FONT color="green">061</FONT> flatten(components);<a name="line.61"></a> |
| <FONT color="green">062</FONT> final int size = components.size();<a name="line.62"></a> |
| <FONT color="green">063</FONT> _components = (Expression[])components.toArray(new Expression[size]);<a name="line.63"></a> |
| <FONT color="green">064</FONT> for (int i = 0; i < size; i++) {<a name="line.64"></a> |
| <FONT color="green">065</FONT> _components[i].setParser(parser);<a name="line.65"></a> |
| <FONT color="green">066</FONT> _components[i].setParent(this);<a name="line.66"></a> |
| <FONT color="green">067</FONT> if (_components[i] instanceof Step) {<a name="line.67"></a> |
| <FONT color="green">068</FONT> final Step step = (Step)_components[i];<a name="line.68"></a> |
| <FONT color="green">069</FONT> final int axis = step.getAxis();<a name="line.69"></a> |
| <FONT color="green">070</FONT> final int type = step.getNodeType();<a name="line.70"></a> |
| <FONT color="green">071</FONT> // Put attribute iterators first<a name="line.71"></a> |
| <FONT color="green">072</FONT> if ((axis == Axis.ATTRIBUTE) || (type == DTM.ATTRIBUTE_NODE)) {<a name="line.72"></a> |
| <FONT color="green">073</FONT> _components[i] = _components[0];<a name="line.73"></a> |
| <FONT color="green">074</FONT> _components[0] = step;<a name="line.74"></a> |
| <FONT color="green">075</FONT> }<a name="line.75"></a> |
| <FONT color="green">076</FONT> // Check if the union contains a reverse iterator<a name="line.76"></a> |
| <FONT color="green">077</FONT> if (Axis.isReverse(axis)) _reverse = true;<a name="line.77"></a> |
| <FONT color="green">078</FONT> }<a name="line.78"></a> |
| <FONT color="green">079</FONT> }<a name="line.79"></a> |
| <FONT color="green">080</FONT> // No need to reverse anything if another expression lies on top of this<a name="line.80"></a> |
| <FONT color="green">081</FONT> if (getParent() instanceof Expression) _reverse = false;<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> public Type typeCheck(SymbolTable stable) throws TypeCheckError {<a name="line.84"></a> |
| <FONT color="green">085</FONT> final int length = _components.length;<a name="line.85"></a> |
| <FONT color="green">086</FONT> for (int i = 0; i < length; i++) {<a name="line.86"></a> |
| <FONT color="green">087</FONT> if (_components[i].typeCheck(stable) != Type.NodeSet) {<a name="line.87"></a> |
| <FONT color="green">088</FONT> _components[i] = new CastExpr(_components[i], Type.NodeSet);<a name="line.88"></a> |
| <FONT color="green">089</FONT> }<a name="line.89"></a> |
| <FONT color="green">090</FONT> }<a name="line.90"></a> |
| <FONT color="green">091</FONT> return _type = Type.NodeSet; <a name="line.91"></a> |
| <FONT color="green">092</FONT> }<a name="line.92"></a> |
| <FONT color="green">093</FONT> <a name="line.93"></a> |
| <FONT color="green">094</FONT> public String toString() {<a name="line.94"></a> |
| <FONT color="green">095</FONT> return "union(" + _pathExpr + ", " + _rest + ')';<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> private void flatten(Vector components) {<a name="line.98"></a> |
| <FONT color="green">099</FONT> components.addElement(_pathExpr);<a name="line.99"></a> |
| <FONT color="green">100</FONT> if (_rest != null) {<a name="line.100"></a> |
| <FONT color="green">101</FONT> if (_rest instanceof UnionPathExpr) {<a name="line.101"></a> |
| <FONT color="green">102</FONT> ((UnionPathExpr)_rest).flatten(components);<a name="line.102"></a> |
| <FONT color="green">103</FONT> }<a name="line.103"></a> |
| <FONT color="green">104</FONT> else {<a name="line.104"></a> |
| <FONT color="green">105</FONT> components.addElement(_rest);<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> }<a name="line.108"></a> |
| <FONT color="green">109</FONT> <a name="line.109"></a> |
| <FONT color="green">110</FONT> public void translate(ClassGenerator classGen, MethodGenerator methodGen) {<a name="line.110"></a> |
| <FONT color="green">111</FONT> final ConstantPoolGen cpg = classGen.getConstantPool();<a name="line.111"></a> |
| <FONT color="green">112</FONT> final InstructionList il = methodGen.getInstructionList();<a name="line.112"></a> |
| <FONT color="green">113</FONT> <a name="line.113"></a> |
| <FONT color="green">114</FONT> final int init = cpg.addMethodref(UNION_ITERATOR_CLASS,<a name="line.114"></a> |
| <FONT color="green">115</FONT> "<init>",<a name="line.115"></a> |
| <FONT color="green">116</FONT> "("+DOM_INTF_SIG+")V");<a name="line.116"></a> |
| <FONT color="green">117</FONT> final int iter = cpg.addMethodref(UNION_ITERATOR_CLASS,<a name="line.117"></a> |
| <FONT color="green">118</FONT> ADD_ITERATOR,<a name="line.118"></a> |
| <FONT color="green">119</FONT> ADD_ITERATOR_SIG);<a name="line.119"></a> |
| <FONT color="green">120</FONT> <a name="line.120"></a> |
| <FONT color="green">121</FONT> // Create the UnionIterator and leave it on the stack<a name="line.121"></a> |
| <FONT color="green">122</FONT> il.append(new NEW(cpg.addClass(UNION_ITERATOR_CLASS)));<a name="line.122"></a> |
| <FONT color="green">123</FONT> il.append(DUP);<a name="line.123"></a> |
| <FONT color="green">124</FONT> il.append(methodGen.loadDOM());<a name="line.124"></a> |
| <FONT color="green">125</FONT> il.append(new INVOKESPECIAL(init));<a name="line.125"></a> |
| <FONT color="green">126</FONT> <a name="line.126"></a> |
| <FONT color="green">127</FONT> // Add the various iterators to the UnionIterator<a name="line.127"></a> |
| <FONT color="green">128</FONT> final int length = _components.length;<a name="line.128"></a> |
| <FONT color="green">129</FONT> for (int i = 0; i < length; i++) {<a name="line.129"></a> |
| <FONT color="green">130</FONT> _components[i].translate(classGen, methodGen);<a name="line.130"></a> |
| <FONT color="green">131</FONT> il.append(new INVOKEVIRTUAL(iter));<a name="line.131"></a> |
| <FONT color="green">132</FONT> }<a name="line.132"></a> |
| <FONT color="green">133</FONT> <a name="line.133"></a> |
| <FONT color="green">134</FONT> // Order the iterator only if strictly needed<a name="line.134"></a> |
| <FONT color="green">135</FONT> if (_reverse) {<a name="line.135"></a> |
| <FONT color="green">136</FONT> final int order = cpg.addInterfaceMethodref(DOM_INTF,<a name="line.136"></a> |
| <FONT color="green">137</FONT> ORDER_ITERATOR,<a name="line.137"></a> |
| <FONT color="green">138</FONT> ORDER_ITERATOR_SIG);<a name="line.138"></a> |
| <FONT color="green">139</FONT> il.append(methodGen.loadDOM());<a name="line.139"></a> |
| <FONT color="green">140</FONT> il.append(SWAP);<a name="line.140"></a> |
| <FONT color="green">141</FONT> il.append(methodGen.loadContextNode());<a name="line.141"></a> |
| <FONT color="green">142</FONT> il.append(new INVOKEINTERFACE(order, 3));<a name="line.142"></a> |
| <FONT color="green">143</FONT> <a name="line.143"></a> |
| <FONT color="green">144</FONT> }<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> |
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| </PRE> |
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