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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: BoolStack.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.xml.utils;<a name="line.21"></a> |
| <FONT color="green">022</FONT> <a name="line.22"></a> |
| <FONT color="green">023</FONT> <a name="line.23"></a> |
| <FONT color="green">024</FONT> /**<a name="line.24"></a> |
| <FONT color="green">025</FONT> * Simple stack for boolean values.<a name="line.25"></a> |
| <FONT color="green">026</FONT> * @xsl.usage internal<a name="line.26"></a> |
| <FONT color="green">027</FONT> */<a name="line.27"></a> |
| <FONT color="green">028</FONT> public final class BoolStack implements Cloneable<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> /** Array of boolean values */<a name="line.31"></a> |
| <FONT color="green">032</FONT> private boolean m_values[];<a name="line.32"></a> |
| <FONT color="green">033</FONT> <a name="line.33"></a> |
| <FONT color="green">034</FONT> /** Array size allocated */<a name="line.34"></a> |
| <FONT color="green">035</FONT> private int m_allocatedSize;<a name="line.35"></a> |
| <FONT color="green">036</FONT> <a name="line.36"></a> |
| <FONT color="green">037</FONT> /** Index into the array of booleans */<a name="line.37"></a> |
| <FONT color="green">038</FONT> private int m_index;<a name="line.38"></a> |
| <FONT color="green">039</FONT> <a name="line.39"></a> |
| <FONT color="green">040</FONT> /**<a name="line.40"></a> |
| <FONT color="green">041</FONT> * Default constructor. Note that the default<a name="line.41"></a> |
| <FONT color="green">042</FONT> * block size is very small, for small lists.<a name="line.42"></a> |
| <FONT color="green">043</FONT> */<a name="line.43"></a> |
| <FONT color="green">044</FONT> public BoolStack()<a name="line.44"></a> |
| <FONT color="green">045</FONT> {<a name="line.45"></a> |
| <FONT color="green">046</FONT> this(32);<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> /**<a name="line.49"></a> |
| <FONT color="green">050</FONT> * Construct a IntVector, using the given block size.<a name="line.50"></a> |
| <FONT color="green">051</FONT> *<a name="line.51"></a> |
| <FONT color="green">052</FONT> * @param size array size to allocate<a name="line.52"></a> |
| <FONT color="green">053</FONT> */<a name="line.53"></a> |
| <FONT color="green">054</FONT> public BoolStack(int size)<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> m_allocatedSize = size;<a name="line.57"></a> |
| <FONT color="green">058</FONT> m_values = new boolean[size];<a name="line.58"></a> |
| <FONT color="green">059</FONT> m_index = -1;<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> * Get the length of the list.<a name="line.63"></a> |
| <FONT color="green">064</FONT> *<a name="line.64"></a> |
| <FONT color="green">065</FONT> * @return Current length of the list<a name="line.65"></a> |
| <FONT color="green">066</FONT> */<a name="line.66"></a> |
| <FONT color="green">067</FONT> public final int size()<a name="line.67"></a> |
| <FONT color="green">068</FONT> {<a name="line.68"></a> |
| <FONT color="green">069</FONT> return m_index + 1;<a name="line.69"></a> |
| <FONT color="green">070</FONT> }<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> * Clears the stack.<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> public final void clear()<a name="line.76"></a> |
| <FONT color="green">077</FONT> {<a name="line.77"></a> |
| <FONT color="green">078</FONT> m_index = -1;<a name="line.78"></a> |
| <FONT color="green">079</FONT> }<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> * Pushes an item onto the top of this stack.<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> * @param val the boolean to be pushed onto this stack.<a name="line.85"></a> |
| <FONT color="green">086</FONT> * @return the <code>item</code> argument.<a name="line.86"></a> |
| <FONT color="green">087</FONT> */<a name="line.87"></a> |
| <FONT color="green">088</FONT> public final boolean push(boolean val)<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> if (m_index == m_allocatedSize - 1)<a name="line.91"></a> |
| <FONT color="green">092</FONT> grow();<a name="line.92"></a> |
| <FONT color="green">093</FONT> <a name="line.93"></a> |
| <FONT color="green">094</FONT> return (m_values[++m_index] = val);<a name="line.94"></a> |
| <FONT color="green">095</FONT> }<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> * Removes the object at the top of this stack and returns that<a name="line.98"></a> |
| <FONT color="green">099</FONT> * object as the value of this function.<a name="line.99"></a> |
| <FONT color="green">100</FONT> *<a name="line.100"></a> |
| <FONT color="green">101</FONT> * @return The object at the top of this stack.<a name="line.101"></a> |
| <FONT color="green">102</FONT> * @throws EmptyStackException if this stack is empty.<a name="line.102"></a> |
| <FONT color="green">103</FONT> */<a name="line.103"></a> |
| <FONT color="green">104</FONT> public final boolean pop()<a name="line.104"></a> |
| <FONT color="green">105</FONT> {<a name="line.105"></a> |
| <FONT color="green">106</FONT> return m_values[m_index--];<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> * Removes the object at the top of this stack and returns the<a name="line.110"></a> |
| <FONT color="green">111</FONT> * next object at the top as the value of this function.<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> * @return Next object to the top or false if none there<a name="line.114"></a> |
| <FONT color="green">115</FONT> */<a name="line.115"></a> |
| <FONT color="green">116</FONT> public final boolean popAndTop()<a name="line.116"></a> |
| <FONT color="green">117</FONT> {<a name="line.117"></a> |
| <FONT color="green">118</FONT> <a name="line.118"></a> |
| <FONT color="green">119</FONT> m_index--;<a name="line.119"></a> |
| <FONT color="green">120</FONT> <a name="line.120"></a> |
| <FONT color="green">121</FONT> return (m_index >= 0) ? m_values[m_index] : false;<a name="line.121"></a> |
| <FONT color="green">122</FONT> }<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> * Set the item at the top of this stack <a name="line.125"></a> |
| <FONT color="green">126</FONT> *<a name="line.126"></a> |
| <FONT color="green">127</FONT> *<a name="line.127"></a> |
| <FONT color="green">128</FONT> * @param b Object to set at the top of this stack<a name="line.128"></a> |
| <FONT color="green">129</FONT> */<a name="line.129"></a> |
| <FONT color="green">130</FONT> public final void setTop(boolean b)<a name="line.130"></a> |
| <FONT color="green">131</FONT> {<a name="line.131"></a> |
| <FONT color="green">132</FONT> m_values[m_index] = b;<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> * Looks at the object at the top of this stack without removing it<a name="line.136"></a> |
| <FONT color="green">137</FONT> * from the stack.<a name="line.137"></a> |
| <FONT color="green">138</FONT> *<a name="line.138"></a> |
| <FONT color="green">139</FONT> * @return the object at the top of this stack.<a name="line.139"></a> |
| <FONT color="green">140</FONT> * @throws EmptyStackException if this stack is empty.<a name="line.140"></a> |
| <FONT color="green">141</FONT> */<a name="line.141"></a> |
| <FONT color="green">142</FONT> public final boolean peek()<a name="line.142"></a> |
| <FONT color="green">143</FONT> {<a name="line.143"></a> |
| <FONT color="green">144</FONT> return m_values[m_index];<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> * Looks at the object at the top of this stack without removing it<a name="line.148"></a> |
| <FONT color="green">149</FONT> * from the stack. If the stack is empty, it returns false.<a name="line.149"></a> |
| <FONT color="green">150</FONT> *<a name="line.150"></a> |
| <FONT color="green">151</FONT> * @return the object at the top of this stack.<a name="line.151"></a> |
| <FONT color="green">152</FONT> */<a name="line.152"></a> |
| <FONT color="green">153</FONT> public final boolean peekOrFalse()<a name="line.153"></a> |
| <FONT color="green">154</FONT> {<a name="line.154"></a> |
| <FONT color="green">155</FONT> return (m_index > -1) ? m_values[m_index] : false;<a name="line.155"></a> |
| <FONT color="green">156</FONT> }<a name="line.156"></a> |
| <FONT color="green">157</FONT> <a name="line.157"></a> |
| <FONT color="green">158</FONT> /**<a name="line.158"></a> |
| <FONT color="green">159</FONT> * Looks at the object at the top of this stack without removing it<a name="line.159"></a> |
| <FONT color="green">160</FONT> * from the stack. If the stack is empty, it returns true.<a name="line.160"></a> |
| <FONT color="green">161</FONT> *<a name="line.161"></a> |
| <FONT color="green">162</FONT> * @return the object at the top of this stack.<a name="line.162"></a> |
| <FONT color="green">163</FONT> */<a name="line.163"></a> |
| <FONT color="green">164</FONT> public final boolean peekOrTrue()<a name="line.164"></a> |
| <FONT color="green">165</FONT> {<a name="line.165"></a> |
| <FONT color="green">166</FONT> return (m_index > -1) ? m_values[m_index] : true;<a name="line.166"></a> |
| <FONT color="green">167</FONT> }<a name="line.167"></a> |
| <FONT color="green">168</FONT> <a name="line.168"></a> |
| <FONT color="green">169</FONT> /**<a name="line.169"></a> |
| <FONT color="green">170</FONT> * Tests if this stack is empty.<a name="line.170"></a> |
| <FONT color="green">171</FONT> *<a name="line.171"></a> |
| <FONT color="green">172</FONT> * @return <code>true</code> if this stack is empty;<a name="line.172"></a> |
| <FONT color="green">173</FONT> * <code>false</code> otherwise.<a name="line.173"></a> |
| <FONT color="green">174</FONT> */<a name="line.174"></a> |
| <FONT color="green">175</FONT> public boolean isEmpty()<a name="line.175"></a> |
| <FONT color="green">176</FONT> {<a name="line.176"></a> |
| <FONT color="green">177</FONT> return (m_index == -1);<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> * Grows the size of the stack<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> private void grow()<a name="line.184"></a> |
| <FONT color="green">185</FONT> {<a name="line.185"></a> |
| <FONT color="green">186</FONT> <a name="line.186"></a> |
| <FONT color="green">187</FONT> m_allocatedSize *= 2;<a name="line.187"></a> |
| <FONT color="green">188</FONT> <a name="line.188"></a> |
| <FONT color="green">189</FONT> boolean newVector[] = new boolean[m_allocatedSize];<a name="line.189"></a> |
| <FONT color="green">190</FONT> <a name="line.190"></a> |
| <FONT color="green">191</FONT> System.arraycopy(m_values, 0, newVector, 0, m_index + 1);<a name="line.191"></a> |
| <FONT color="green">192</FONT> <a name="line.192"></a> |
| <FONT color="green">193</FONT> m_values = newVector;<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> public Object clone() <a name="line.196"></a> |
| <FONT color="green">197</FONT> throws CloneNotSupportedException<a name="line.197"></a> |
| <FONT color="green">198</FONT> {<a name="line.198"></a> |
| <FONT color="green">199</FONT> return super.clone();<a name="line.199"></a> |
| <FONT color="green">200</FONT> }<a name="line.200"></a> |
| <FONT color="green">201</FONT> <a name="line.201"></a> |
| <FONT color="green">202</FONT> }<a name="line.202"></a> |
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| </PRE> |
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