Google Git
Sign in
apache / xalan-site / baed2198e564a4221346ce9823f7f57830a0d758 / . / docs / xalan / xalan-j / apidocs / src-html / org / apache / xalan / xsltc / dom / SortingIterator.html
blob: 32ec889a4ae8d0519f6db28e08b5c733b1616aed [file] [log] [blame]
<HTML>
<BODY BGCOLOR="white">
<PRE>
<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: SortingIterator.java 468651 2006-10-28 07:04:25Z 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.dom;<a name="line.22"></a>
<FONT color="green">023</FONT> <a name="line.23"></a>
<FONT color="green">024</FONT> import org.apache.xalan.xsltc.runtime.BasisLibrary;<a name="line.24"></a>
<FONT color="green">025</FONT> import org.apache.xml.dtm.DTMAxisIterator;<a name="line.25"></a>
<FONT color="green">026</FONT> import org.apache.xml.dtm.ref.DTMAxisIteratorBase;<a name="line.26"></a>
<FONT color="green">027</FONT> <a name="line.27"></a>
<FONT color="green">028</FONT> /**<a name="line.28"></a>
<FONT color="green">029</FONT> * @author Jacek Ambroziak<a name="line.29"></a>
<FONT color="green">030</FONT> * @author Santiago Pericas-Geertsen<a name="line.30"></a>
<FONT color="green">031</FONT> * @author Morten Jorgensen<a name="line.31"></a>
<FONT color="green">032</FONT> */<a name="line.32"></a>
<FONT color="green">033</FONT> public final class SortingIterator extends DTMAxisIteratorBase {<a name="line.33"></a>
<FONT color="green">034</FONT> private final static int INIT_DATA_SIZE = 16;<a name="line.34"></a>
<FONT color="green">035</FONT> <a name="line.35"></a>
<FONT color="green">036</FONT> private DTMAxisIterator _source;<a name="line.36"></a>
<FONT color="green">037</FONT> private NodeSortRecordFactory _factory;<a name="line.37"></a>
<FONT color="green">038</FONT> <a name="line.38"></a>
<FONT color="green">039</FONT> private NodeSortRecord[] _data;<a name="line.39"></a>
<FONT color="green">040</FONT> private int _free = 0;<a name="line.40"></a>
<FONT color="green">041</FONT> private int _current; // index in _nodes of the next node to try<a name="line.41"></a>
<FONT color="green">042</FONT> <a name="line.42"></a>
<FONT color="green">043</FONT> public SortingIterator(DTMAxisIterator source, <a name="line.43"></a>
<FONT color="green">044</FONT> NodeSortRecordFactory factory) {<a name="line.44"></a>
<FONT color="green">045</FONT> _source = source;<a name="line.45"></a>
<FONT color="green">046</FONT> _factory = factory;<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> public int next() {<a name="line.49"></a>
<FONT color="green">050</FONT> return _current &lt; _free ? _data[_current++].getNode() : END;<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> public DTMAxisIterator setStartNode(int node) {<a name="line.53"></a>
<FONT color="green">054</FONT> try {<a name="line.54"></a>
<FONT color="green">055</FONT> _source.setStartNode(_startNode = node);<a name="line.55"></a>
<FONT color="green">056</FONT> _data = new NodeSortRecord[INIT_DATA_SIZE];<a name="line.56"></a>
<FONT color="green">057</FONT> _free = 0;<a name="line.57"></a>
<FONT color="green">058</FONT> <a name="line.58"></a>
<FONT color="green">059</FONT> // gather all nodes from the source iterator<a name="line.59"></a>
<FONT color="green">060</FONT> while ((node = _source.next()) != END) {<a name="line.60"></a>
<FONT color="green">061</FONT> addRecord(_factory.makeNodeSortRecord(node,_free));<a name="line.61"></a>
<FONT color="green">062</FONT> }<a name="line.62"></a>
<FONT color="green">063</FONT> // now sort the records<a name="line.63"></a>
<FONT color="green">064</FONT> quicksort(0, _free - 1);<a name="line.64"></a>
<FONT color="green">065</FONT> <a name="line.65"></a>
<FONT color="green">066</FONT> _current = 0;<a name="line.66"></a>
<FONT color="green">067</FONT> return this;<a name="line.67"></a>
<FONT color="green">068</FONT> }<a name="line.68"></a>
<FONT color="green">069</FONT> catch (Exception e) {<a name="line.69"></a>
<FONT color="green">070</FONT> return this;<a name="line.70"></a>
<FONT color="green">071</FONT> }<a name="line.71"></a>
<FONT color="green">072</FONT> }<a name="line.72"></a>
<FONT color="green">073</FONT> <a name="line.73"></a>
<FONT color="green">074</FONT> public int getPosition() {<a name="line.74"></a>
<FONT color="green">075</FONT> return _current == 0 ? 1 : _current;<a name="line.75"></a>
<FONT color="green">076</FONT> }<a name="line.76"></a>
<FONT color="green">077</FONT> <a name="line.77"></a>
<FONT color="green">078</FONT> public int getLast() {<a name="line.78"></a>
<FONT color="green">079</FONT> return _free;<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> public void setMark() {<a name="line.82"></a>
<FONT color="green">083</FONT> _source.setMark();<a name="line.83"></a>
<FONT color="green">084</FONT> _markedNode = _current;<a name="line.84"></a>
<FONT color="green">085</FONT> }<a name="line.85"></a>
<FONT color="green">086</FONT> <a name="line.86"></a>
<FONT color="green">087</FONT> public void gotoMark() {<a name="line.87"></a>
<FONT color="green">088</FONT> _source.gotoMark();<a name="line.88"></a>
<FONT color="green">089</FONT> _current = _markedNode;<a name="line.89"></a>
<FONT color="green">090</FONT> }<a name="line.90"></a>
<FONT color="green">091</FONT> <a name="line.91"></a>
<FONT color="green">092</FONT> /**<a name="line.92"></a>
<FONT color="green">093</FONT> * Clone a &lt;code&gt;SortingIterator&lt;/code&gt; by cloning its source<a name="line.93"></a>
<FONT color="green">094</FONT> * iterator and then sharing the factory and the array of<a name="line.94"></a>
<FONT color="green">095</FONT> * &lt;code&gt;NodeSortRecords&lt;/code&gt;.<a name="line.95"></a>
<FONT color="green">096</FONT> */<a name="line.96"></a>
<FONT color="green">097</FONT> public DTMAxisIterator cloneIterator() {<a name="line.97"></a>
<FONT color="green">098</FONT> try {<a name="line.98"></a>
<FONT color="green">099</FONT> final SortingIterator clone = (SortingIterator) super.clone();<a name="line.99"></a>
<FONT color="green">100</FONT> clone._source = _source.cloneIterator(); <a name="line.100"></a>
<FONT color="green">101</FONT> clone._factory = _factory; // shared between clones<a name="line.101"></a>
<FONT color="green">102</FONT> clone._data = _data; // shared between clones<a name="line.102"></a>
<FONT color="green">103</FONT> clone._free = _free;<a name="line.103"></a>
<FONT color="green">104</FONT> clone._current = _current;<a name="line.104"></a>
<FONT color="green">105</FONT> clone.setRestartable(false);<a name="line.105"></a>
<FONT color="green">106</FONT> return clone.reset();<a name="line.106"></a>
<FONT color="green">107</FONT> }<a name="line.107"></a>
<FONT color="green">108</FONT> catch (CloneNotSupportedException e) {<a name="line.108"></a>
<FONT color="green">109</FONT> BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,<a name="line.109"></a>
<FONT color="green">110</FONT> e.toString());<a name="line.110"></a>
<FONT color="green">111</FONT> return null;<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> <a name="line.114"></a>
<FONT color="green">115</FONT> private void addRecord(NodeSortRecord record) {<a name="line.115"></a>
<FONT color="green">116</FONT> if (_free == _data.length) {<a name="line.116"></a>
<FONT color="green">117</FONT> NodeSortRecord[] newArray = new NodeSortRecord[_data.length * 2];<a name="line.117"></a>
<FONT color="green">118</FONT> System.arraycopy(_data, 0, newArray, 0, _free);<a name="line.118"></a>
<FONT color="green">119</FONT> _data = newArray;<a name="line.119"></a>
<FONT color="green">120</FONT> }<a name="line.120"></a>
<FONT color="green">121</FONT> _data[_free++] = record;<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> private void quicksort(int p, int r) {<a name="line.124"></a>
<FONT color="green">125</FONT> while (p &lt; r) {<a name="line.125"></a>
<FONT color="green">126</FONT> final int q = partition(p, r);<a name="line.126"></a>
<FONT color="green">127</FONT> quicksort(p, q);<a name="line.127"></a>
<FONT color="green">128</FONT> p = q + 1;<a name="line.128"></a>
<FONT color="green">129</FONT> }<a name="line.129"></a>
<FONT color="green">130</FONT> }<a name="line.130"></a>
<FONT color="green">131</FONT> <a name="line.131"></a>
<FONT color="green">132</FONT> private int partition(int p, int r) {<a name="line.132"></a>
<FONT color="green">133</FONT> final NodeSortRecord x = _data[(p + r) &gt;&gt;&gt; 1];<a name="line.133"></a>
<FONT color="green">134</FONT> int i = p - 1;<a name="line.134"></a>
<FONT color="green">135</FONT> int j = r + 1;<a name="line.135"></a>
<FONT color="green">136</FONT> while (true) {<a name="line.136"></a>
<FONT color="green">137</FONT> while (x.compareTo(_data[--j]) &lt; 0);<a name="line.137"></a>
<FONT color="green">138</FONT> while (x.compareTo(_data[++i]) &gt; 0);<a name="line.138"></a>
<FONT color="green">139</FONT> if (i &lt; j) {<a name="line.139"></a>
<FONT color="green">140</FONT> final NodeSortRecord t = _data[i];<a name="line.140"></a>
<FONT color="green">141</FONT> _data[i] = _data[j];<a name="line.141"></a>
<FONT color="green">142</FONT> _data[j] = t;<a name="line.142"></a>
<FONT color="green">143</FONT> }<a name="line.143"></a>
<FONT color="green">144</FONT> else {<a name="line.144"></a>
<FONT color="green">145</FONT> return(j);<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> }<a name="line.148"></a>
<FONT color="green">149</FONT> }<a name="line.149"></a>
</PRE>
</BODY>
</HTML>