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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: VariableStack.java 524812 2007-04-02 15:52:03Z zongaro $<a name="line.19"></a> |
| <FONT color="green">020</FONT> */<a name="line.20"></a> |
| <FONT color="green">021</FONT> package org.apache.xpath;<a name="line.21"></a> |
| <FONT color="green">022</FONT> <a name="line.22"></a> |
| <FONT color="green">023</FONT> import javax.xml.transform.TransformerException;<a name="line.23"></a> |
| <FONT color="green">024</FONT> <a name="line.24"></a> |
| <FONT color="green">025</FONT> import org.apache.xalan.res.XSLMessages;<a name="line.25"></a> |
| <FONT color="green">026</FONT> import org.apache.xpath.objects.XObject;<a name="line.26"></a> |
| <FONT color="green">027</FONT> import org.apache.xpath.res.XPATHErrorResources;<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> * Defines a class to keep track of a stack for<a name="line.30"></a> |
| <FONT color="green">031</FONT> * template arguments and variables.<a name="line.31"></a> |
| <FONT color="green">032</FONT> *<a name="line.32"></a> |
| <FONT color="green">033</FONT> * <p>This has been changed from the previous incarnations of this<a name="line.33"></a> |
| <FONT color="green">034</FONT> * class to be fairly low level.</p><a name="line.34"></a> |
| <FONT color="green">035</FONT> * @xsl.usage internal<a name="line.35"></a> |
| <FONT color="green">036</FONT> */<a name="line.36"></a> |
| <FONT color="green">037</FONT> public class VariableStack implements Cloneable<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> * limitation for 1K<a name="line.40"></a> |
| <FONT color="green">041</FONT> */<a name="line.41"></a> |
| <FONT color="green">042</FONT> public static final int CLEARLIMITATION= 1024;<a name="line.42"></a> |
| <FONT color="green">043</FONT> <a name="line.43"></a> |
| <FONT color="green">044</FONT> /**<a name="line.44"></a> |
| <FONT color="green">045</FONT> * Constructor for a variable stack.<a name="line.45"></a> |
| <FONT color="green">046</FONT> */<a name="line.46"></a> |
| <FONT color="green">047</FONT> public VariableStack()<a name="line.47"></a> |
| <FONT color="green">048</FONT> {<a name="line.48"></a> |
| <FONT color="green">049</FONT> reset();<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> /**<a name="line.52"></a> |
| <FONT color="green">053</FONT> * Constructor for a variable stack.<a name="line.53"></a> |
| <FONT color="green">054</FONT> * @param initStackSize The initial stack size. Must be at least one. The<a name="line.54"></a> |
| <FONT color="green">055</FONT> * stack can grow if needed.<a name="line.55"></a> |
| <FONT color="green">056</FONT> */<a name="line.56"></a> |
| <FONT color="green">057</FONT> public VariableStack(int initStackSize)<a name="line.57"></a> |
| <FONT color="green">058</FONT> {<a name="line.58"></a> |
| <FONT color="green">059</FONT> // Allow for twice as many variables as stack link entries<a name="line.59"></a> |
| <FONT color="green">060</FONT> reset(initStackSize, initStackSize*2);<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> /**<a name="line.63"></a> |
| <FONT color="green">064</FONT> * Returns a clone of this variable stack.<a name="line.64"></a> |
| <FONT color="green">065</FONT> *<a name="line.65"></a> |
| <FONT color="green">066</FONT> * @return a clone of this variable stack.<a name="line.66"></a> |
| <FONT color="green">067</FONT> *<a name="line.67"></a> |
| <FONT color="green">068</FONT> * @throws CloneNotSupportedException<a name="line.68"></a> |
| <FONT color="green">069</FONT> */<a name="line.69"></a> |
| <FONT color="green">070</FONT> public synchronized Object clone() throws CloneNotSupportedException<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> VariableStack vs = (VariableStack) super.clone();<a name="line.73"></a> |
| <FONT color="green">074</FONT> <a name="line.74"></a> |
| <FONT color="green">075</FONT> // I *think* I can get away with a shallow clone here?<a name="line.75"></a> |
| <FONT color="green">076</FONT> vs._stackFrames = (XObject[]) _stackFrames.clone();<a name="line.76"></a> |
| <FONT color="green">077</FONT> vs._links = (int[]) _links.clone();<a name="line.77"></a> |
| <FONT color="green">078</FONT> <a name="line.78"></a> |
| <FONT color="green">079</FONT> return vs;<a name="line.79"></a> |
| <FONT color="green">080</FONT> }<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> * The stack frame where all variables and params will be kept.<a name="line.83"></a> |
| <FONT color="green">084</FONT> * @serial<a name="line.84"></a> |
| <FONT color="green">085</FONT> */<a name="line.85"></a> |
| <FONT color="green">086</FONT> XObject[] _stackFrames;<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> * The top of the stack frame (<code>_stackFrames</code>).<a name="line.89"></a> |
| <FONT color="green">090</FONT> * @serial<a name="line.90"></a> |
| <FONT color="green">091</FONT> */<a name="line.91"></a> |
| <FONT color="green">092</FONT> int _frameTop;<a name="line.92"></a> |
| <FONT color="green">093</FONT> <a name="line.93"></a> |
| <FONT color="green">094</FONT> /**<a name="line.94"></a> |
| <FONT color="green">095</FONT> * The bottom index of the current frame (relative to <code>_stackFrames</code>).<a name="line.95"></a> |
| <FONT color="green">096</FONT> * @serial<a name="line.96"></a> |
| <FONT color="green">097</FONT> */<a name="line.97"></a> |
| <FONT color="green">098</FONT> private int _currentFrameBottom;<a name="line.98"></a> |
| <FONT color="green">099</FONT> <a name="line.99"></a> |
| <FONT color="green">100</FONT> /**<a name="line.100"></a> |
| <FONT color="green">101</FONT> * The stack of frame positions. I call 'em links because of distant<a name="line.101"></a> |
| <FONT color="green">102</FONT> * <a href="http://math.millikin.edu/mprogers/Courses/currentCourses/CS481-ComputerArchitecture/cs481.Motorola68000.html"><a name="line.102"></a> |
| <FONT color="green">103</FONT> * Motorola 68000 assembler</a> memories. :-)<a name="line.103"></a> |
| <FONT color="green">104</FONT> * @serial<a name="line.104"></a> |
| <FONT color="green">105</FONT> */<a name="line.105"></a> |
| <FONT color="green">106</FONT> int[] _links;<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> * The top of the links stack.<a name="line.109"></a> |
| <FONT color="green">110</FONT> */<a name="line.110"></a> |
| <FONT color="green">111</FONT> int _linksTop;<a name="line.111"></a> |
| <FONT color="green">112</FONT> <a name="line.112"></a> |
| <FONT color="green">113</FONT> /**<a name="line.113"></a> |
| <FONT color="green">114</FONT> * Get the element at the given index, regardless of stackframe.<a name="line.114"></a> |
| <FONT color="green">115</FONT> *<a name="line.115"></a> |
| <FONT color="green">116</FONT> * @param i index from zero.<a name="line.116"></a> |
| <FONT color="green">117</FONT> *<a name="line.117"></a> |
| <FONT color="green">118</FONT> * @return The item at the given index.<a name="line.118"></a> |
| <FONT color="green">119</FONT> */<a name="line.119"></a> |
| <FONT color="green">120</FONT> public XObject elementAt(final int i)<a name="line.120"></a> |
| <FONT color="green">121</FONT> {<a name="line.121"></a> |
| <FONT color="green">122</FONT> return _stackFrames[i];<a name="line.122"></a> |
| <FONT color="green">123</FONT> }<a name="line.123"></a> |
| <FONT color="green">124</FONT> <a name="line.124"></a> |
| <FONT color="green">125</FONT> /**<a name="line.125"></a> |
| <FONT color="green">126</FONT> * Get size of the stack.<a name="line.126"></a> |
| <FONT color="green">127</FONT> *<a name="line.127"></a> |
| <FONT color="green">128</FONT> * @return the total size of the execution stack.<a name="line.128"></a> |
| <FONT color="green">129</FONT> */<a name="line.129"></a> |
| <FONT color="green">130</FONT> public int size()<a name="line.130"></a> |
| <FONT color="green">131</FONT> {<a name="line.131"></a> |
| <FONT color="green">132</FONT> return _frameTop;<a name="line.132"></a> |
| <FONT color="green">133</FONT> }<a name="line.133"></a> |
| <FONT color="green">134</FONT> <a name="line.134"></a> |
| <FONT color="green">135</FONT> /**<a name="line.135"></a> |
| <FONT color="green">136</FONT> * Reset the stack to a start position.<a name="line.136"></a> |
| <FONT color="green">137</FONT> */<a name="line.137"></a> |
| <FONT color="green">138</FONT> public void reset()<a name="line.138"></a> |
| <FONT color="green">139</FONT> {<a name="line.139"></a> |
| <FONT color="green">140</FONT> // If the stack was previously allocated, assume that about the same<a name="line.140"></a> |
| <FONT color="green">141</FONT> // amount of stack space will be needed again; otherwise, use a very<a name="line.141"></a> |
| <FONT color="green">142</FONT> // large stack size.<a name="line.142"></a> |
| <FONT color="green">143</FONT> int linksSize = (_links == null) ? XPathContext.RECURSIONLIMIT<a name="line.143"></a> |
| <FONT color="green">144</FONT> : _links.length;<a name="line.144"></a> |
| <FONT color="green">145</FONT> int varArraySize = (_stackFrames == null) ? XPathContext.RECURSIONLIMIT * 2<a name="line.145"></a> |
| <FONT color="green">146</FONT> : _stackFrames.length;<a name="line.146"></a> |
| <FONT color="green">147</FONT> reset(linksSize, varArraySize);<a name="line.147"></a> |
| <FONT color="green">148</FONT> }<a name="line.148"></a> |
| <FONT color="green">149</FONT> <a name="line.149"></a> |
| <FONT color="green">150</FONT> /**<a name="line.150"></a> |
| <FONT color="green">151</FONT> * Reset the stack to a start position.<a name="line.151"></a> |
| <FONT color="green">152</FONT> * @param linksSize Initial stack size to use<a name="line.152"></a> |
| <FONT color="green">153</FONT> * @param varArraySize Initial variable array size to use<a name="line.153"></a> |
| <FONT color="green">154</FONT> */<a name="line.154"></a> |
| <FONT color="green">155</FONT> protected void reset(int linksSize, int varArraySize) {<a name="line.155"></a> |
| <FONT color="green">156</FONT> _frameTop = 0;<a name="line.156"></a> |
| <FONT color="green">157</FONT> _linksTop = 0;<a name="line.157"></a> |
| <FONT color="green">158</FONT> <a name="line.158"></a> |
| <FONT color="green">159</FONT> // Don't bother reallocating _links array if it exists already<a name="line.159"></a> |
| <FONT color="green">160</FONT> if (_links == null) {<a name="line.160"></a> |
| <FONT color="green">161</FONT> _links = new int[linksSize];<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> // Adding one here to the stack of frame positions will allow us always <a name="line.164"></a> |
| <FONT color="green">165</FONT> // to look one under without having to check if we're at zero.<a name="line.165"></a> |
| <FONT color="green">166</FONT> // (As long as the caller doesn't screw up link/unlink.)<a name="line.166"></a> |
| <FONT color="green">167</FONT> _links[_linksTop++] = 0;<a name="line.167"></a> |
| <FONT color="green">168</FONT> <a name="line.168"></a> |
| <FONT color="green">169</FONT> // Get a clean _stackFrames array and discard the old one.<a name="line.169"></a> |
| <FONT color="green">170</FONT> _stackFrames = new XObject[varArraySize]; <a name="line.170"></a> |
| <FONT color="green">171</FONT> }<a name="line.171"></a> |
| <FONT color="green">172</FONT> <a name="line.172"></a> |
| <FONT color="green">173</FONT> /**<a name="line.173"></a> |
| <FONT color="green">174</FONT> * Set the current stack frame.<a name="line.174"></a> |
| <FONT color="green">175</FONT> *<a name="line.175"></a> |
| <FONT color="green">176</FONT> * @param sf The new stack frame position.<a name="line.176"></a> |
| <FONT color="green">177</FONT> */<a name="line.177"></a> |
| <FONT color="green">178</FONT> public void setStackFrame(int sf)<a name="line.178"></a> |
| <FONT color="green">179</FONT> {<a name="line.179"></a> |
| <FONT color="green">180</FONT> _currentFrameBottom = sf;<a name="line.180"></a> |
| <FONT color="green">181</FONT> }<a name="line.181"></a> |
| <FONT color="green">182</FONT> <a name="line.182"></a> |
| <FONT color="green">183</FONT> /**<a name="line.183"></a> |
| <FONT color="green">184</FONT> * Get the position from where the search should start,<a name="line.184"></a> |
| <FONT color="green">185</FONT> * which is either the searchStart property, or the top<a name="line.185"></a> |
| <FONT color="green">186</FONT> * of the stack if that value is -1.<a name="line.186"></a> |
| <FONT color="green">187</FONT> *<a name="line.187"></a> |
| <FONT color="green">188</FONT> * @return The current stack frame position.<a name="line.188"></a> |
| <FONT color="green">189</FONT> */<a name="line.189"></a> |
| <FONT color="green">190</FONT> public int getStackFrame()<a name="line.190"></a> |
| <FONT color="green">191</FONT> {<a name="line.191"></a> |
| <FONT color="green">192</FONT> return _currentFrameBottom;<a name="line.192"></a> |
| <FONT color="green">193</FONT> }<a name="line.193"></a> |
| <FONT color="green">194</FONT> <a name="line.194"></a> |
| <FONT color="green">195</FONT> /**<a name="line.195"></a> |
| <FONT color="green">196</FONT> * Allocates memory (called a stackframe) on the stack; used to store<a name="line.196"></a> |
| <FONT color="green">197</FONT> * local variables and parameter arguments.<a name="line.197"></a> |
| <FONT color="green">198</FONT> *<a name="line.198"></a> |
| <FONT color="green">199</FONT> * <p>I use the link/unlink concept because of distant<a name="line.199"></a> |
| <FONT color="green">200</FONT> * <a href="http://math.millikin.edu/mprogers/Courses/currentCourses/CS481-ComputerArchitecture/cs481.Motorola68000.html"><a name="line.200"></a> |
| <FONT color="green">201</FONT> * Motorola 68000 assembler</a> memories.</p><a name="line.201"></a> |
| <FONT color="green">202</FONT> *<a name="line.202"></a> |
| <FONT color="green">203</FONT> * @param size The size of the stack frame allocation. This ammount should<a name="line.203"></a> |
| <FONT color="green">204</FONT> * normally be the maximum number of variables that you can have allocated<a name="line.204"></a> |
| <FONT color="green">205</FONT> * at one time in the new stack frame.<a name="line.205"></a> |
| <FONT color="green">206</FONT> *<a name="line.206"></a> |
| <FONT color="green">207</FONT> * @return The bottom of the stack frame, from where local variable addressing<a name="line.207"></a> |
| <FONT color="green">208</FONT> * should start from.<a name="line.208"></a> |
| <FONT color="green">209</FONT> */<a name="line.209"></a> |
| <FONT color="green">210</FONT> public int link(final int size)<a name="line.210"></a> |
| <FONT color="green">211</FONT> {<a name="line.211"></a> |
| <FONT color="green">212</FONT> <a name="line.212"></a> |
| <FONT color="green">213</FONT> _currentFrameBottom = _frameTop;<a name="line.213"></a> |
| <FONT color="green">214</FONT> _frameTop += size;<a name="line.214"></a> |
| <FONT color="green">215</FONT> <a name="line.215"></a> |
| <FONT color="green">216</FONT> if (_frameTop >= _stackFrames.length)<a name="line.216"></a> |
| <FONT color="green">217</FONT> {<a name="line.217"></a> |
| <FONT color="green">218</FONT> XObject newsf[] = new XObject[_stackFrames.length + XPathContext.RECURSIONLIMIT + size];<a name="line.218"></a> |
| <FONT color="green">219</FONT> <a name="line.219"></a> |
| <FONT color="green">220</FONT> System.arraycopy(_stackFrames, 0, newsf, 0, _stackFrames.length);<a name="line.220"></a> |
| <FONT color="green">221</FONT> <a name="line.221"></a> |
| <FONT color="green">222</FONT> _stackFrames = newsf;<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> if (_linksTop + 1 >= _links.length)<a name="line.225"></a> |
| <FONT color="green">226</FONT> {<a name="line.226"></a> |
| <FONT color="green">227</FONT> int newlinks[] = new int[_links.length + (CLEARLIMITATION * 2)];<a name="line.227"></a> |
| <FONT color="green">228</FONT> <a name="line.228"></a> |
| <FONT color="green">229</FONT> System.arraycopy(_links, 0, newlinks, 0, _links.length);<a name="line.229"></a> |
| <FONT color="green">230</FONT> <a name="line.230"></a> |
| <FONT color="green">231</FONT> _links = newlinks;<a name="line.231"></a> |
| <FONT color="green">232</FONT> }<a name="line.232"></a> |
| <FONT color="green">233</FONT> <a name="line.233"></a> |
| <FONT color="green">234</FONT> _links[_linksTop++] = _currentFrameBottom;<a name="line.234"></a> |
| <FONT color="green">235</FONT> <a name="line.235"></a> |
| <FONT color="green">236</FONT> return _currentFrameBottom;<a name="line.236"></a> |
| <FONT color="green">237</FONT> }<a name="line.237"></a> |
| <FONT color="green">238</FONT> <a name="line.238"></a> |
| <FONT color="green">239</FONT> /**<a name="line.239"></a> |
| <FONT color="green">240</FONT> * Free up the stack frame that was last allocated with<a name="line.240"></a> |
| <FONT color="green">241</FONT> * {@link #link(int size)}.<a name="line.241"></a> |
| <FONT color="green">242</FONT> */<a name="line.242"></a> |
| <FONT color="green">243</FONT> public void unlink()<a name="line.243"></a> |
| <FONT color="green">244</FONT> {<a name="line.244"></a> |
| <FONT color="green">245</FONT> _frameTop = _links[--_linksTop];<a name="line.245"></a> |
| <FONT color="green">246</FONT> _currentFrameBottom = _links[_linksTop - 1];<a name="line.246"></a> |
| <FONT color="green">247</FONT> }<a name="line.247"></a> |
| <FONT color="green">248</FONT> <a name="line.248"></a> |
| <FONT color="green">249</FONT> /**<a name="line.249"></a> |
| <FONT color="green">250</FONT> * Free up the stack frame that was last allocated with<a name="line.250"></a> |
| <FONT color="green">251</FONT> * {@link #link(int size)}.<a name="line.251"></a> |
| <FONT color="green">252</FONT> * @param currentFrame The current frame to set to <a name="line.252"></a> |
| <FONT color="green">253</FONT> * after the unlink.<a name="line.253"></a> |
| <FONT color="green">254</FONT> */<a name="line.254"></a> |
| <FONT color="green">255</FONT> public void unlink(int currentFrame)<a name="line.255"></a> |
| <FONT color="green">256</FONT> {<a name="line.256"></a> |
| <FONT color="green">257</FONT> _frameTop = _links[--_linksTop];<a name="line.257"></a> |
| <FONT color="green">258</FONT> _currentFrameBottom = currentFrame; <a name="line.258"></a> |
| <FONT color="green">259</FONT> }<a name="line.259"></a> |
| <FONT color="green">260</FONT> <a name="line.260"></a> |
| <FONT color="green">261</FONT> /**<a name="line.261"></a> |
| <FONT color="green">262</FONT> * Set a local variable or parameter in the current stack frame.<a name="line.262"></a> |
| <FONT color="green">263</FONT> *<a name="line.263"></a> |
| <FONT color="green">264</FONT> *<a name="line.264"></a> |
| <FONT color="green">265</FONT> * @param index Local variable index relative to the current stack<a name="line.265"></a> |
| <FONT color="green">266</FONT> * frame bottom.<a name="line.266"></a> |
| <FONT color="green">267</FONT> *<a name="line.267"></a> |
| <FONT color="green">268</FONT> * @param val The value of the variable that is being set.<a name="line.268"></a> |
| <FONT color="green">269</FONT> */<a name="line.269"></a> |
| <FONT color="green">270</FONT> public void setLocalVariable(int index, XObject val)<a name="line.270"></a> |
| <FONT color="green">271</FONT> {<a name="line.271"></a> |
| <FONT color="green">272</FONT> _stackFrames[index + _currentFrameBottom] = val;<a name="line.272"></a> |
| <FONT color="green">273</FONT> }<a name="line.273"></a> |
| <FONT color="green">274</FONT> <a name="line.274"></a> |
| <FONT color="green">275</FONT> /**<a name="line.275"></a> |
| <FONT color="green">276</FONT> * Set a local variable or parameter in the specified stack frame.<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> * @param index Local variable index relative to the current stack<a name="line.279"></a> |
| <FONT color="green">280</FONT> * frame bottom.<a name="line.280"></a> |
| <FONT color="green">281</FONT> * NEEDSDOC @param stackFrame<a name="line.281"></a> |
| <FONT color="green">282</FONT> *<a name="line.282"></a> |
| <FONT color="green">283</FONT> * @param val The value of the variable that is being set.<a name="line.283"></a> |
| <FONT color="green">284</FONT> */<a name="line.284"></a> |
| <FONT color="green">285</FONT> public void setLocalVariable(int index, XObject val, int stackFrame)<a name="line.285"></a> |
| <FONT color="green">286</FONT> {<a name="line.286"></a> |
| <FONT color="green">287</FONT> _stackFrames[index + stackFrame] = val;<a name="line.287"></a> |
| <FONT color="green">288</FONT> }<a name="line.288"></a> |
| <FONT color="green">289</FONT> <a name="line.289"></a> |
| <FONT color="green">290</FONT> /**<a name="line.290"></a> |
| <FONT color="green">291</FONT> * Get a local variable or parameter in the current stack frame.<a name="line.291"></a> |
| <FONT color="green">292</FONT> *<a name="line.292"></a> |
| <FONT color="green">293</FONT> *<a name="line.293"></a> |
| <FONT color="green">294</FONT> * @param xctxt The XPath context, which must be passed in order to<a name="line.294"></a> |
| <FONT color="green">295</FONT> * lazy evaluate variables.<a name="line.295"></a> |
| <FONT color="green">296</FONT> *<a name="line.296"></a> |
| <FONT color="green">297</FONT> * @param index Local variable index relative to the current stack<a name="line.297"></a> |
| <FONT color="green">298</FONT> * frame bottom.<a name="line.298"></a> |
| <FONT color="green">299</FONT> *<a name="line.299"></a> |
| <FONT color="green">300</FONT> * @return The value of the variable.<a name="line.300"></a> |
| <FONT color="green">301</FONT> *<a name="line.301"></a> |
| <FONT color="green">302</FONT> * @throws TransformerException<a name="line.302"></a> |
| <FONT color="green">303</FONT> */<a name="line.303"></a> |
| <FONT color="green">304</FONT> public XObject getLocalVariable(XPathContext xctxt, int index)<a name="line.304"></a> |
| <FONT color="green">305</FONT> throws TransformerException<a name="line.305"></a> |
| <FONT color="green">306</FONT> {<a name="line.306"></a> |
| <FONT color="green">307</FONT> <a name="line.307"></a> |
| <FONT color="green">308</FONT> index += _currentFrameBottom;<a name="line.308"></a> |
| <FONT color="green">309</FONT> <a name="line.309"></a> |
| <FONT color="green">310</FONT> XObject val = _stackFrames[index];<a name="line.310"></a> |
| <FONT color="green">311</FONT> <a name="line.311"></a> |
| <FONT color="green">312</FONT> if(null == val)<a name="line.312"></a> |
| <FONT color="green">313</FONT> throw new TransformerException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_VARIABLE_ACCESSED_BEFORE_BIND, null),<a name="line.313"></a> |
| <FONT color="green">314</FONT> xctxt.getSAXLocator());<a name="line.314"></a> |
| <FONT color="green">315</FONT> // "Variable accessed before it is bound!", xctxt.getSAXLocator());<a name="line.315"></a> |
| <FONT color="green">316</FONT> <a name="line.316"></a> |
| <FONT color="green">317</FONT> // Lazy execution of variables.<a name="line.317"></a> |
| <FONT color="green">318</FONT> if (val.getType() == XObject.CLASS_UNRESOLVEDVARIABLE)<a name="line.318"></a> |
| <FONT color="green">319</FONT> return (_stackFrames[index] = val.execute(xctxt));<a name="line.319"></a> |
| <FONT color="green">320</FONT> <a name="line.320"></a> |
| <FONT color="green">321</FONT> return val;<a name="line.321"></a> |
| <FONT color="green">322</FONT> }<a name="line.322"></a> |
| <FONT color="green">323</FONT> <a name="line.323"></a> |
| <FONT color="green">324</FONT> /**<a name="line.324"></a> |
| <FONT color="green">325</FONT> * Get a local variable or parameter in the current stack frame.<a name="line.325"></a> |
| <FONT color="green">326</FONT> *<a name="line.326"></a> |
| <FONT color="green">327</FONT> *<a name="line.327"></a> |
| <FONT color="green">328</FONT> * @param index Local variable index relative to the given<a name="line.328"></a> |
| <FONT color="green">329</FONT> * frame bottom.<a name="line.329"></a> |
| <FONT color="green">330</FONT> * NEEDSDOC @param frame<a name="line.330"></a> |
| <FONT color="green">331</FONT> *<a name="line.331"></a> |
| <FONT color="green">332</FONT> * @return The value of the variable.<a name="line.332"></a> |
| <FONT color="green">333</FONT> *<a name="line.333"></a> |
| <FONT color="green">334</FONT> * @throws TransformerException<a name="line.334"></a> |
| <FONT color="green">335</FONT> */<a name="line.335"></a> |
| <FONT color="green">336</FONT> public XObject getLocalVariable(int index, int frame)<a name="line.336"></a> |
| <FONT color="green">337</FONT> throws TransformerException<a name="line.337"></a> |
| <FONT color="green">338</FONT> {<a name="line.338"></a> |
| <FONT color="green">339</FONT> <a name="line.339"></a> |
| <FONT color="green">340</FONT> index += frame;<a name="line.340"></a> |
| <FONT color="green">341</FONT> <a name="line.341"></a> |
| <FONT color="green">342</FONT> XObject val = _stackFrames[index];<a name="line.342"></a> |
| <FONT color="green">343</FONT> <a name="line.343"></a> |
| <FONT color="green">344</FONT> return val;<a name="line.344"></a> |
| <FONT color="green">345</FONT> }<a name="line.345"></a> |
| <FONT color="green">346</FONT> <a name="line.346"></a> |
| <FONT color="green">347</FONT> /**<a name="line.347"></a> |
| <FONT color="green">348</FONT> * Get a local variable or parameter in the current stack frame.<a name="line.348"></a> |
| <FONT color="green">349</FONT> *<a name="line.349"></a> |
| <FONT color="green">350</FONT> *<a name="line.350"></a> |
| <FONT color="green">351</FONT> * @param xctxt The XPath context, which must be passed in order to<a name="line.351"></a> |
| <FONT color="green">352</FONT> * lazy evaluate variables.<a name="line.352"></a> |
| <FONT color="green">353</FONT> *<a name="line.353"></a> |
| <FONT color="green">354</FONT> * @param index Local variable index relative to the current stack<a name="line.354"></a> |
| <FONT color="green">355</FONT> * frame bottom.<a name="line.355"></a> |
| <FONT color="green">356</FONT> *<a name="line.356"></a> |
| <FONT color="green">357</FONT> * @return The value of the variable.<a name="line.357"></a> |
| <FONT color="green">358</FONT> *<a name="line.358"></a> |
| <FONT color="green">359</FONT> * @throws TransformerException<a name="line.359"></a> |
| <FONT color="green">360</FONT> */<a name="line.360"></a> |
| <FONT color="green">361</FONT> public XObject getLocalVariable(XPathContext xctxt, int index, boolean destructiveOK)<a name="line.361"></a> |
| <FONT color="green">362</FONT> throws TransformerException<a name="line.362"></a> |
| <FONT color="green">363</FONT> {<a name="line.363"></a> |
| <FONT color="green">364</FONT> <a name="line.364"></a> |
| <FONT color="green">365</FONT> index += _currentFrameBottom;<a name="line.365"></a> |
| <FONT color="green">366</FONT> <a name="line.366"></a> |
| <FONT color="green">367</FONT> XObject val = _stackFrames[index];<a name="line.367"></a> |
| <FONT color="green">368</FONT> <a name="line.368"></a> |
| <FONT color="green">369</FONT> if(null == val)<a name="line.369"></a> |
| <FONT color="green">370</FONT> throw new TransformerException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_VARIABLE_ACCESSED_BEFORE_BIND, null),<a name="line.370"></a> |
| <FONT color="green">371</FONT> xctxt.getSAXLocator());<a name="line.371"></a> |
| <FONT color="green">372</FONT> // "Variable accessed before it is bound!", xctxt.getSAXLocator());<a name="line.372"></a> |
| <FONT color="green">373</FONT> <a name="line.373"></a> |
| <FONT color="green">374</FONT> // Lazy execution of variables.<a name="line.374"></a> |
| <FONT color="green">375</FONT> if (val.getType() == XObject.CLASS_UNRESOLVEDVARIABLE)<a name="line.375"></a> |
| <FONT color="green">376</FONT> return (_stackFrames[index] = val.execute(xctxt));<a name="line.376"></a> |
| <FONT color="green">377</FONT> <a name="line.377"></a> |
| <FONT color="green">378</FONT> return destructiveOK ? val : val.getFresh();<a name="line.378"></a> |
| <FONT color="green">379</FONT> }<a name="line.379"></a> |
| <FONT color="green">380</FONT> <a name="line.380"></a> |
| <FONT color="green">381</FONT> /**<a name="line.381"></a> |
| <FONT color="green">382</FONT> * Tell if a local variable has been set or not.<a name="line.382"></a> |
| <FONT color="green">383</FONT> *<a name="line.383"></a> |
| <FONT color="green">384</FONT> * @param index Local variable index relative to the current stack<a name="line.384"></a> |
| <FONT color="green">385</FONT> * frame bottom.<a name="line.385"></a> |
| <FONT color="green">386</FONT> *<a name="line.386"></a> |
| <FONT color="green">387</FONT> * @return true if the value at the index is not null.<a name="line.387"></a> |
| <FONT color="green">388</FONT> *<a name="line.388"></a> |
| <FONT color="green">389</FONT> * @throws TransformerException<a name="line.389"></a> |
| <FONT color="green">390</FONT> */<a name="line.390"></a> |
| <FONT color="green">391</FONT> public boolean isLocalSet(int index) throws TransformerException<a name="line.391"></a> |
| <FONT color="green">392</FONT> {<a name="line.392"></a> |
| <FONT color="green">393</FONT> return (_stackFrames[index + _currentFrameBottom] != null);<a name="line.393"></a> |
| <FONT color="green">394</FONT> }<a name="line.394"></a> |
| <FONT color="green">395</FONT> <a name="line.395"></a> |
| <FONT color="green">396</FONT> /** NEEDSDOC Field m_nulls */<a name="line.396"></a> |
| <FONT color="green">397</FONT> private static XObject[] m_nulls = new XObject[CLEARLIMITATION];<a name="line.397"></a> |
| <FONT color="green">398</FONT> <a name="line.398"></a> |
| <FONT color="green">399</FONT> /**<a name="line.399"></a> |
| <FONT color="green">400</FONT> * Use this to clear the variables in a section of the stack. This is<a name="line.400"></a> |
| <FONT color="green">401</FONT> * used to clear the parameter section of the stack, so that default param<a name="line.401"></a> |
| <FONT color="green">402</FONT> * values can tell if they've already been set. It is important to note that<a name="line.402"></a> |
| <FONT color="green">403</FONT> * this function has a 1K limitation.<a name="line.403"></a> |
| <FONT color="green">404</FONT> *<a name="line.404"></a> |
| <FONT color="green">405</FONT> * @param start The start position, relative to the current local stack frame.<a name="line.405"></a> |
| <FONT color="green">406</FONT> * @param len The number of slots to be cleared.<a name="line.406"></a> |
| <FONT color="green">407</FONT> */<a name="line.407"></a> |
| <FONT color="green">408</FONT> public void clearLocalSlots(int start, int len)<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> start += _currentFrameBottom;<a name="line.411"></a> |
| <FONT color="green">412</FONT> <a name="line.412"></a> |
| <FONT color="green">413</FONT> System.arraycopy(m_nulls, 0, _stackFrames, start, len);<a name="line.413"></a> |
| <FONT color="green">414</FONT> }<a name="line.414"></a> |
| <FONT color="green">415</FONT> <a name="line.415"></a> |
| <FONT color="green">416</FONT> /**<a name="line.416"></a> |
| <FONT color="green">417</FONT> * Set a global variable or parameter in the global stack frame.<a name="line.417"></a> |
| <FONT color="green">418</FONT> *<a name="line.418"></a> |
| <FONT color="green">419</FONT> *<a name="line.419"></a> |
| <FONT color="green">420</FONT> * @param index Local variable index relative to the global stack frame<a name="line.420"></a> |
| <FONT color="green">421</FONT> * bottom.<a name="line.421"></a> |
| <FONT color="green">422</FONT> *<a name="line.422"></a> |
| <FONT color="green">423</FONT> * @param val The value of the variable that is being set.<a name="line.423"></a> |
| <FONT color="green">424</FONT> */<a name="line.424"></a> |
| <FONT color="green">425</FONT> public void setGlobalVariable(final int index, final XObject val)<a name="line.425"></a> |
| <FONT color="green">426</FONT> {<a name="line.426"></a> |
| <FONT color="green">427</FONT> _stackFrames[index] = val;<a name="line.427"></a> |
| <FONT color="green">428</FONT> }<a name="line.428"></a> |
| <FONT color="green">429</FONT> <a name="line.429"></a> |
| <FONT color="green">430</FONT> /**<a name="line.430"></a> |
| <FONT color="green">431</FONT> * Get a global variable or parameter from the global stack frame.<a name="line.431"></a> |
| <FONT color="green">432</FONT> *<a name="line.432"></a> |
| <FONT color="green">433</FONT> *<a name="line.433"></a> |
| <FONT color="green">434</FONT> * @param xctxt The XPath context, which must be passed in order to<a name="line.434"></a> |
| <FONT color="green">435</FONT> * lazy evaluate variables.<a name="line.435"></a> |
| <FONT color="green">436</FONT> *<a name="line.436"></a> |
| <FONT color="green">437</FONT> * @param index Global variable index relative to the global stack<a name="line.437"></a> |
| <FONT color="green">438</FONT> * frame bottom.<a name="line.438"></a> |
| <FONT color="green">439</FONT> *<a name="line.439"></a> |
| <FONT color="green">440</FONT> * @return The value of the variable.<a name="line.440"></a> |
| <FONT color="green">441</FONT> *<a name="line.441"></a> |
| <FONT color="green">442</FONT> * @throws TransformerException<a name="line.442"></a> |
| <FONT color="green">443</FONT> */<a name="line.443"></a> |
| <FONT color="green">444</FONT> public XObject getGlobalVariable(XPathContext xctxt, final int index)<a name="line.444"></a> |
| <FONT color="green">445</FONT> throws TransformerException<a name="line.445"></a> |
| <FONT color="green">446</FONT> {<a name="line.446"></a> |
| <FONT color="green">447</FONT> <a name="line.447"></a> |
| <FONT color="green">448</FONT> XObject val = _stackFrames[index];<a name="line.448"></a> |
| <FONT color="green">449</FONT> <a name="line.449"></a> |
| <FONT color="green">450</FONT> // Lazy execution of variables.<a name="line.450"></a> |
| <FONT color="green">451</FONT> if (val.getType() == XObject.CLASS_UNRESOLVEDVARIABLE)<a name="line.451"></a> |
| <FONT color="green">452</FONT> return (_stackFrames[index] = val.execute(xctxt));<a name="line.452"></a> |
| <FONT color="green">453</FONT> <a name="line.453"></a> |
| <FONT color="green">454</FONT> return val;<a name="line.454"></a> |
| <FONT color="green">455</FONT> }<a name="line.455"></a> |
| <FONT color="green">456</FONT> <a name="line.456"></a> |
| <FONT color="green">457</FONT> /**<a name="line.457"></a> |
| <FONT color="green">458</FONT> * Get a global variable or parameter from the global stack frame.<a name="line.458"></a> |
| <FONT color="green">459</FONT> *<a name="line.459"></a> |
| <FONT color="green">460</FONT> *<a name="line.460"></a> |
| <FONT color="green">461</FONT> * @param xctxt The XPath context, which must be passed in order to<a name="line.461"></a> |
| <FONT color="green">462</FONT> * lazy evaluate variables.<a name="line.462"></a> |
| <FONT color="green">463</FONT> *<a name="line.463"></a> |
| <FONT color="green">464</FONT> * @param index Global variable index relative to the global stack<a name="line.464"></a> |
| <FONT color="green">465</FONT> * frame bottom.<a name="line.465"></a> |
| <FONT color="green">466</FONT> *<a name="line.466"></a> |
| <FONT color="green">467</FONT> * @return The value of the variable.<a name="line.467"></a> |
| <FONT color="green">468</FONT> *<a name="line.468"></a> |
| <FONT color="green">469</FONT> * @throws TransformerException<a name="line.469"></a> |
| <FONT color="green">470</FONT> */<a name="line.470"></a> |
| <FONT color="green">471</FONT> public XObject getGlobalVariable(XPathContext xctxt, final int index, boolean destructiveOK)<a name="line.471"></a> |
| <FONT color="green">472</FONT> throws TransformerException<a name="line.472"></a> |
| <FONT color="green">473</FONT> {<a name="line.473"></a> |
| <FONT color="green">474</FONT> <a name="line.474"></a> |
| <FONT color="green">475</FONT> XObject val = _stackFrames[index];<a name="line.475"></a> |
| <FONT color="green">476</FONT> <a name="line.476"></a> |
| <FONT color="green">477</FONT> // Lazy execution of variables.<a name="line.477"></a> |
| <FONT color="green">478</FONT> if (val.getType() == XObject.CLASS_UNRESOLVEDVARIABLE)<a name="line.478"></a> |
| <FONT color="green">479</FONT> return (_stackFrames[index] = val.execute(xctxt));<a name="line.479"></a> |
| <FONT color="green">480</FONT> <a name="line.480"></a> |
| <FONT color="green">481</FONT> return destructiveOK ? val : val.getFresh();<a name="line.481"></a> |
| <FONT color="green">482</FONT> }<a name="line.482"></a> |
| <FONT color="green">483</FONT> <a name="line.483"></a> |
| <FONT color="green">484</FONT> /**<a name="line.484"></a> |
| <FONT color="green">485</FONT> * Get a variable based on it's qualified name.<a name="line.485"></a> |
| <FONT color="green">486</FONT> * This is for external use only.<a name="line.486"></a> |
| <FONT color="green">487</FONT> *<a name="line.487"></a> |
| <FONT color="green">488</FONT> * @param xctxt The XPath context, which must be passed in order to<a name="line.488"></a> |
| <FONT color="green">489</FONT> * lazy evaluate variables.<a name="line.489"></a> |
| <FONT color="green">490</FONT> * <a name="line.490"></a> |
| <FONT color="green">491</FONT> * @param qname The qualified name of the variable.<a name="line.491"></a> |
| <FONT color="green">492</FONT> *<a name="line.492"></a> |
| <FONT color="green">493</FONT> * @return The evaluated value of the variable.<a name="line.493"></a> |
| <FONT color="green">494</FONT> *<a name="line.494"></a> |
| <FONT color="green">495</FONT> * @throws javax.xml.transform.TransformerException<a name="line.495"></a> |
| <FONT color="green">496</FONT> */<a name="line.496"></a> |
| <FONT color="green">497</FONT> public XObject getVariableOrParam(<a name="line.497"></a> |
| <FONT color="green">498</FONT> XPathContext xctxt, org.apache.xml.utils.QName qname)<a name="line.498"></a> |
| <FONT color="green">499</FONT> throws javax.xml.transform.TransformerException<a name="line.499"></a> |
| <FONT color="green">500</FONT> {<a name="line.500"></a> |
| <FONT color="green">501</FONT> <a name="line.501"></a> |
| <FONT color="green">502</FONT> org.apache.xml.utils.PrefixResolver prefixResolver =<a name="line.502"></a> |
| <FONT color="green">503</FONT> xctxt.getNamespaceContext();<a name="line.503"></a> |
| <FONT color="green">504</FONT> <a name="line.504"></a> |
| <FONT color="green">505</FONT> // Get the current ElemTemplateElement, which must be pushed in as the <a name="line.505"></a> |
| <FONT color="green">506</FONT> // prefix resolver, and then walk backwards in document order, searching <a name="line.506"></a> |
| <FONT color="green">507</FONT> // for an xsl:param element or xsl:variable element that matches our <a name="line.507"></a> |
| <FONT color="green">508</FONT> // qname. If we reach the top level, use the StylesheetRoot's composed<a name="line.508"></a> |
| <FONT color="green">509</FONT> // list of top level variables and parameters.<a name="line.509"></a> |
| <FONT color="green">510</FONT> <a name="line.510"></a> |
| <FONT color="green">511</FONT> if (prefixResolver instanceof org.apache.xalan.templates.ElemTemplateElement)<a name="line.511"></a> |
| <FONT color="green">512</FONT> {<a name="line.512"></a> |
| <FONT color="green">513</FONT> <a name="line.513"></a> |
| <FONT color="green">514</FONT> org.apache.xalan.templates.ElemVariable vvar;<a name="line.514"></a> |
| <FONT color="green">515</FONT> <a name="line.515"></a> |
| <FONT color="green">516</FONT> org.apache.xalan.templates.ElemTemplateElement prev =<a name="line.516"></a> |
| <FONT color="green">517</FONT> (org.apache.xalan.templates.ElemTemplateElement) prefixResolver;<a name="line.517"></a> |
| <FONT color="green">518</FONT> <a name="line.518"></a> |
| <FONT color="green">519</FONT> if (!(prev instanceof org.apache.xalan.templates.Stylesheet))<a name="line.519"></a> |
| <FONT color="green">520</FONT> {<a name="line.520"></a> |
| <FONT color="green">521</FONT> while ( !(prev.getParentNode() instanceof org.apache.xalan.templates.Stylesheet) )<a name="line.521"></a> |
| <FONT color="green">522</FONT> {<a name="line.522"></a> |
| <FONT color="green">523</FONT> org.apache.xalan.templates.ElemTemplateElement savedprev = prev;<a name="line.523"></a> |
| <FONT color="green">524</FONT> <a name="line.524"></a> |
| <FONT color="green">525</FONT> while (null != (prev = prev.getPreviousSiblingElem()))<a name="line.525"></a> |
| <FONT color="green">526</FONT> {<a name="line.526"></a> |
| <FONT color="green">527</FONT> if (prev instanceof org.apache.xalan.templates.ElemVariable)<a name="line.527"></a> |
| <FONT color="green">528</FONT> {<a name="line.528"></a> |
| <FONT color="green">529</FONT> vvar = (org.apache.xalan.templates.ElemVariable) prev;<a name="line.529"></a> |
| <FONT color="green">530</FONT> <a name="line.530"></a> |
| <FONT color="green">531</FONT> if (vvar.getName().equals(qname))<a name="line.531"></a> |
| <FONT color="green">532</FONT> return getLocalVariable(xctxt, vvar.getIndex());<a name="line.532"></a> |
| <FONT color="green">533</FONT> }<a name="line.533"></a> |
| <FONT color="green">534</FONT> }<a name="line.534"></a> |
| <FONT color="green">535</FONT> prev = savedprev.getParentElem();<a name="line.535"></a> |
| <FONT color="green">536</FONT> }<a name="line.536"></a> |
| <FONT color="green">537</FONT> }<a name="line.537"></a> |
| <FONT color="green">538</FONT> <a name="line.538"></a> |
| <FONT color="green">539</FONT> vvar = prev.getStylesheetRoot().getVariableOrParamComposed(qname);<a name="line.539"></a> |
| <FONT color="green">540</FONT> if (null != vvar)<a name="line.540"></a> |
| <FONT color="green">541</FONT> return getGlobalVariable(xctxt, vvar.getIndex());<a name="line.541"></a> |
| <FONT color="green">542</FONT> }<a name="line.542"></a> |
| <FONT color="green">543</FONT> <a name="line.543"></a> |
| <FONT color="green">544</FONT> throw new javax.xml.transform.TransformerException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_VAR_NOT_RESOLVABLE, new Object[]{qname.toString()})); //"Variable not resolvable: " + qname);<a name="line.544"></a> |
| <FONT color="green">545</FONT> }<a name="line.545"></a> |
| <FONT color="green">546</FONT> } // end VariableStack<a name="line.546"></a> |
| <FONT color="green">547</FONT> <a name="line.547"></a> |
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| </PRE> |
| </BODY> |
| </HTML> |
