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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: DocumentCache.java 1225369 2011-12-28 22:54:01Z mrglavas $<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 java.io.File;<a name="line.24"></a> |
| <FONT color="green">025</FONT> import java.io.PrintWriter;<a name="line.25"></a> |
| <FONT color="green">026</FONT> import java.net.URL;<a name="line.26"></a> |
| <FONT color="green">027</FONT> import java.net.URLConnection;<a name="line.27"></a> |
| <FONT color="green">028</FONT> import java.net.URLDecoder;<a name="line.28"></a> |
| <FONT color="green">029</FONT> import java.util.Date;<a name="line.29"></a> |
| <FONT color="green">030</FONT> import java.util.Hashtable;<a name="line.30"></a> |
| <FONT color="green">031</FONT> <a name="line.31"></a> |
| <FONT color="green">032</FONT> import javax.xml.parsers.ParserConfigurationException;<a name="line.32"></a> |
| <FONT color="green">033</FONT> import javax.xml.parsers.SAXParser;<a name="line.33"></a> |
| <FONT color="green">034</FONT> import javax.xml.parsers.SAXParserFactory;<a name="line.34"></a> |
| <FONT color="green">035</FONT> import javax.xml.transform.TransformerException;<a name="line.35"></a> |
| <FONT color="green">036</FONT> import javax.xml.transform.sax.SAXSource;<a name="line.36"></a> |
| <FONT color="green">037</FONT> <a name="line.37"></a> |
| <FONT color="green">038</FONT> import org.apache.xalan.xsltc.DOM;<a name="line.38"></a> |
| <FONT color="green">039</FONT> import org.apache.xalan.xsltc.DOMCache;<a name="line.39"></a> |
| <FONT color="green">040</FONT> import org.apache.xalan.xsltc.DOMEnhancedForDTM;<a name="line.40"></a> |
| <FONT color="green">041</FONT> import org.apache.xalan.xsltc.Translet;<a name="line.41"></a> |
| <FONT color="green">042</FONT> import org.apache.xalan.xsltc.runtime.AbstractTranslet;<a name="line.42"></a> |
| <FONT color="green">043</FONT> import org.apache.xalan.xsltc.runtime.BasisLibrary;<a name="line.43"></a> |
| <FONT color="green">044</FONT> import org.apache.xalan.xsltc.runtime.Constants;<a name="line.44"></a> |
| <FONT color="green">045</FONT> import org.apache.xml.utils.SystemIDResolver;<a name="line.45"></a> |
| <FONT color="green">046</FONT> <a name="line.46"></a> |
| <FONT color="green">047</FONT> import org.xml.sax.InputSource;<a name="line.47"></a> |
| <FONT color="green">048</FONT> import org.xml.sax.SAXException;<a name="line.48"></a> |
| <FONT color="green">049</FONT> import org.xml.sax.XMLReader;<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> * @author Morten Jorgensen<a name="line.52"></a> |
| <FONT color="green">053</FONT> */<a name="line.53"></a> |
| <FONT color="green">054</FONT> public final class DocumentCache implements DOMCache {<a name="line.54"></a> |
| <FONT color="green">055</FONT> <a name="line.55"></a> |
| <FONT color="green">056</FONT> private int _size;<a name="line.56"></a> |
| <FONT color="green">057</FONT> private Hashtable _references;<a name="line.57"></a> |
| <FONT color="green">058</FONT> private String[] _URIs;<a name="line.58"></a> |
| <FONT color="green">059</FONT> private int _count;<a name="line.59"></a> |
| <FONT color="green">060</FONT> private int _current;<a name="line.60"></a> |
| <FONT color="green">061</FONT> private SAXParser _parser;<a name="line.61"></a> |
| <FONT color="green">062</FONT> private XMLReader _reader;<a name="line.62"></a> |
| <FONT color="green">063</FONT> private XSLTCDTMManager _dtmManager;<a name="line.63"></a> |
| <FONT color="green">064</FONT> <a name="line.64"></a> |
| <FONT color="green">065</FONT> private static final int REFRESH_INTERVAL = 1000;<a name="line.65"></a> |
| <FONT color="green">066</FONT> <a name="line.66"></a> |
| <FONT color="green">067</FONT> /*<a name="line.67"></a> |
| <FONT color="green">068</FONT> * Inner class containing a DOMImpl object and DTD handler<a name="line.68"></a> |
| <FONT color="green">069</FONT> */<a name="line.69"></a> |
| <FONT color="green">070</FONT> public final class CachedDocument {<a name="line.70"></a> |
| <FONT color="green">071</FONT> <a name="line.71"></a> |
| <FONT color="green">072</FONT> // Statistics data<a name="line.72"></a> |
| <FONT color="green">073</FONT> private long _firstReferenced;<a name="line.73"></a> |
| <FONT color="green">074</FONT> private long _lastReferenced;<a name="line.74"></a> |
| <FONT color="green">075</FONT> private long _accessCount;<a name="line.75"></a> |
| <FONT color="green">076</FONT> private long _lastModified;<a name="line.76"></a> |
| <FONT color="green">077</FONT> private long _lastChecked;<a name="line.77"></a> |
| <FONT color="green">078</FONT> private long _buildTime;<a name="line.78"></a> |
| <FONT color="green">079</FONT> <a name="line.79"></a> |
| <FONT color="green">080</FONT> // DOM and DTD handler references<a name="line.80"></a> |
| <FONT color="green">081</FONT> private DOMEnhancedForDTM _dom = null;<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> * Constructor - load document and initialise statistics<a name="line.84"></a> |
| <FONT color="green">085</FONT> */<a name="line.85"></a> |
| <FONT color="green">086</FONT> public CachedDocument(String uri) {<a name="line.86"></a> |
| <FONT color="green">087</FONT> // Initialise statistics variables<a name="line.87"></a> |
| <FONT color="green">088</FONT> final long stamp = System.currentTimeMillis();<a name="line.88"></a> |
| <FONT color="green">089</FONT> _firstReferenced = stamp;<a name="line.89"></a> |
| <FONT color="green">090</FONT> _lastReferenced = stamp;<a name="line.90"></a> |
| <FONT color="green">091</FONT> _accessCount = 0;<a name="line.91"></a> |
| <FONT color="green">092</FONT> loadDocument(uri);<a name="line.92"></a> |
| <FONT color="green">093</FONT> <a name="line.93"></a> |
| <FONT color="green">094</FONT> _buildTime = System.currentTimeMillis() - stamp;<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> * Loads the document and updates build-time (latency) statistics<a name="line.98"></a> |
| <FONT color="green">099</FONT> */<a name="line.99"></a> |
| <FONT color="green">100</FONT> public void loadDocument(String uri) {<a name="line.100"></a> |
| <FONT color="green">101</FONT> <a name="line.101"></a> |
| <FONT color="green">102</FONT> try {<a name="line.102"></a> |
| <FONT color="green">103</FONT> final long stamp = System.currentTimeMillis();<a name="line.103"></a> |
| <FONT color="green">104</FONT> _dom = (DOMEnhancedForDTM)_dtmManager.getDTM(<a name="line.104"></a> |
| <FONT color="green">105</FONT> new SAXSource(_reader, new InputSource(uri)),<a name="line.105"></a> |
| <FONT color="green">106</FONT> false, null, true, false);<a name="line.106"></a> |
| <FONT color="green">107</FONT> _dom.setDocumentURI(uri);<a name="line.107"></a> |
| <FONT color="green">108</FONT> <a name="line.108"></a> |
| <FONT color="green">109</FONT> // The build time can be used for statistics for a better<a name="line.109"></a> |
| <FONT color="green">110</FONT> // priority algorithm (currently round robin).<a name="line.110"></a> |
| <FONT color="green">111</FONT> final long thisTime = System.currentTimeMillis() - stamp;<a name="line.111"></a> |
| <FONT color="green">112</FONT> if (_buildTime > 0)<a name="line.112"></a> |
| <FONT color="green">113</FONT> _buildTime = (_buildTime + thisTime) >>> 1;<a name="line.113"></a> |
| <FONT color="green">114</FONT> else<a name="line.114"></a> |
| <FONT color="green">115</FONT> _buildTime = thisTime;<a name="line.115"></a> |
| <FONT color="green">116</FONT> }<a name="line.116"></a> |
| <FONT color="green">117</FONT> catch (Exception e) {<a name="line.117"></a> |
| <FONT color="green">118</FONT> _dom = null;<a name="line.118"></a> |
| <FONT color="green">119</FONT> }<a name="line.119"></a> |
| <FONT color="green">120</FONT> }<a name="line.120"></a> |
| <FONT color="green">121</FONT> <a name="line.121"></a> |
| <FONT color="green">122</FONT> public DOM getDocument() { return(_dom); }<a name="line.122"></a> |
| <FONT color="green">123</FONT> <a name="line.123"></a> |
| <FONT color="green">124</FONT> public long getFirstReferenced() { return(_firstReferenced); }<a name="line.124"></a> |
| <FONT color="green">125</FONT> <a name="line.125"></a> |
| <FONT color="green">126</FONT> public long getLastReferenced() { return(_lastReferenced); }<a name="line.126"></a> |
| <FONT color="green">127</FONT> <a name="line.127"></a> |
| <FONT color="green">128</FONT> public long getAccessCount() { return(_accessCount); }<a name="line.128"></a> |
| <FONT color="green">129</FONT> <a name="line.129"></a> |
| <FONT color="green">130</FONT> public void incAccessCount() { _accessCount++; }<a name="line.130"></a> |
| <FONT color="green">131</FONT> <a name="line.131"></a> |
| <FONT color="green">132</FONT> public long getLastModified() { return(_lastModified); }<a name="line.132"></a> |
| <FONT color="green">133</FONT> <a name="line.133"></a> |
| <FONT color="green">134</FONT> public void setLastModified(long t){ _lastModified = t; }<a name="line.134"></a> |
| <FONT color="green">135</FONT> <a name="line.135"></a> |
| <FONT color="green">136</FONT> public long getLatency() { return(_buildTime); }<a name="line.136"></a> |
| <FONT color="green">137</FONT> <a name="line.137"></a> |
| <FONT color="green">138</FONT> public long getLastChecked() { return(_lastChecked); }<a name="line.138"></a> |
| <FONT color="green">139</FONT> <a name="line.139"></a> |
| <FONT color="green">140</FONT> public void setLastChecked(long t) { _lastChecked = t; }<a name="line.140"></a> |
| <FONT color="green">141</FONT> <a name="line.141"></a> |
| <FONT color="green">142</FONT> public long getEstimatedSize() {<a name="line.142"></a> |
| <FONT color="green">143</FONT> if (_dom != null)<a name="line.143"></a> |
| <FONT color="green">144</FONT> return(_dom.getSize() << 5); // ???<a name="line.144"></a> |
| <FONT color="green">145</FONT> else<a name="line.145"></a> |
| <FONT color="green">146</FONT> return(0);<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> |
| <FONT color="green">150</FONT> <a name="line.150"></a> |
| <FONT color="green">151</FONT> /**<a name="line.151"></a> |
| <FONT color="green">152</FONT> * DocumentCache constructor<a name="line.152"></a> |
| <FONT color="green">153</FONT> */<a name="line.153"></a> |
| <FONT color="green">154</FONT> public DocumentCache(int size) throws SAXException {<a name="line.154"></a> |
| <FONT color="green">155</FONT> this(size, null);<a name="line.155"></a> |
| <FONT color="green">156</FONT> try {<a name="line.156"></a> |
| <FONT color="green">157</FONT> _dtmManager = (XSLTCDTMManager)XSLTCDTMManager.getDTMManagerClass()<a name="line.157"></a> |
| <FONT color="green">158</FONT> .newInstance();<a name="line.158"></a> |
| <FONT color="green">159</FONT> } catch (Exception e) {<a name="line.159"></a> |
| <FONT color="green">160</FONT> throw new SAXException(e);<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> /**<a name="line.164"></a> |
| <FONT color="green">165</FONT> * DocumentCache constructor<a name="line.165"></a> |
| <FONT color="green">166</FONT> */<a name="line.166"></a> |
| <FONT color="green">167</FONT> public DocumentCache(int size, XSLTCDTMManager dtmManager) throws SAXException {<a name="line.167"></a> |
| <FONT color="green">168</FONT> _dtmManager = dtmManager;<a name="line.168"></a> |
| <FONT color="green">169</FONT> _count = 0;<a name="line.169"></a> |
| <FONT color="green">170</FONT> _current = 0;<a name="line.170"></a> |
| <FONT color="green">171</FONT> _size = size;<a name="line.171"></a> |
| <FONT color="green">172</FONT> _references = new Hashtable(_size+2);<a name="line.172"></a> |
| <FONT color="green">173</FONT> _URIs = new String[_size];<a name="line.173"></a> |
| <FONT color="green">174</FONT> <a name="line.174"></a> |
| <FONT color="green">175</FONT> try {<a name="line.175"></a> |
| <FONT color="green">176</FONT> // Create a SAX parser and get the XMLReader object it uses<a name="line.176"></a> |
| <FONT color="green">177</FONT> final SAXParserFactory factory = SAXParserFactory.newInstance();<a name="line.177"></a> |
| <FONT color="green">178</FONT> try {<a name="line.178"></a> |
| <FONT color="green">179</FONT> factory.setFeature(Constants.NAMESPACE_FEATURE,true);<a name="line.179"></a> |
| <FONT color="green">180</FONT> }<a name="line.180"></a> |
| <FONT color="green">181</FONT> catch (Exception e) {<a name="line.181"></a> |
| <FONT color="green">182</FONT> factory.setNamespaceAware(true);<a name="line.182"></a> |
| <FONT color="green">183</FONT> }<a name="line.183"></a> |
| <FONT color="green">184</FONT> _parser = factory.newSAXParser();<a name="line.184"></a> |
| <FONT color="green">185</FONT> _reader = _parser.getXMLReader();<a name="line.185"></a> |
| <FONT color="green">186</FONT> }<a name="line.186"></a> |
| <FONT color="green">187</FONT> catch (ParserConfigurationException e) {<a name="line.187"></a> |
| <FONT color="green">188</FONT> BasisLibrary.runTimeError(BasisLibrary.NAMESPACES_SUPPORT_ERR);<a name="line.188"></a> |
| <FONT color="green">189</FONT> }<a name="line.189"></a> |
| <FONT color="green">190</FONT> }<a name="line.190"></a> |
| <FONT color="green">191</FONT> <a name="line.191"></a> |
| <FONT color="green">192</FONT> /**<a name="line.192"></a> |
| <FONT color="green">193</FONT> * Returns the time-stamp for a document's last update<a name="line.193"></a> |
| <FONT color="green">194</FONT> */<a name="line.194"></a> |
| <FONT color="green">195</FONT> private final long getLastModified(String uri) {<a name="line.195"></a> |
| <FONT color="green">196</FONT> try {<a name="line.196"></a> |
| <FONT color="green">197</FONT> URL url = new URL(uri);<a name="line.197"></a> |
| <FONT color="green">198</FONT> URLConnection connection = url.openConnection();<a name="line.198"></a> |
| <FONT color="green">199</FONT> long timestamp = connection.getLastModified();<a name="line.199"></a> |
| <FONT color="green">200</FONT> // Check for a "file:" URI (courtesy of Brian Ewins)<a name="line.200"></a> |
| <FONT color="green">201</FONT> if (timestamp == 0){ // get 0 for local URI<a name="line.201"></a> |
| <FONT color="green">202</FONT> if ("file".equals(url.getProtocol())){<a name="line.202"></a> |
| <FONT color="green">203</FONT> File localfile = new File(URLDecoder.decode(url.getFile()));<a name="line.203"></a> |
| <FONT color="green">204</FONT> timestamp = localfile.lastModified();<a name="line.204"></a> |
| <FONT color="green">205</FONT> }<a name="line.205"></a> |
| <FONT color="green">206</FONT> }<a name="line.206"></a> |
| <FONT color="green">207</FONT> return(timestamp);<a name="line.207"></a> |
| <FONT color="green">208</FONT> }<a name="line.208"></a> |
| <FONT color="green">209</FONT> // Brutal handling of all exceptions<a name="line.209"></a> |
| <FONT color="green">210</FONT> catch (Exception e) {<a name="line.210"></a> |
| <FONT color="green">211</FONT> return(System.currentTimeMillis());<a name="line.211"></a> |
| <FONT color="green">212</FONT> }<a name="line.212"></a> |
| <FONT color="green">213</FONT> }<a name="line.213"></a> |
| <FONT color="green">214</FONT> <a name="line.214"></a> |
| <FONT color="green">215</FONT> /**<a name="line.215"></a> |
| <FONT color="green">216</FONT> *<a name="line.216"></a> |
| <FONT color="green">217</FONT> */<a name="line.217"></a> |
| <FONT color="green">218</FONT> private CachedDocument lookupDocument(String uri) {<a name="line.218"></a> |
| <FONT color="green">219</FONT> return((CachedDocument)_references.get(uri));<a name="line.219"></a> |
| <FONT color="green">220</FONT> }<a name="line.220"></a> |
| <FONT color="green">221</FONT> <a name="line.221"></a> |
| <FONT color="green">222</FONT> /**<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> private synchronized void insertDocument(String uri, CachedDocument doc) {<a name="line.225"></a> |
| <FONT color="green">226</FONT> if (_count < _size) {<a name="line.226"></a> |
| <FONT color="green">227</FONT> // Insert out URI in circular buffer<a name="line.227"></a> |
| <FONT color="green">228</FONT> _URIs[_count++] = uri;<a name="line.228"></a> |
| <FONT color="green">229</FONT> _current = 0;<a name="line.229"></a> |
| <FONT color="green">230</FONT> }<a name="line.230"></a> |
| <FONT color="green">231</FONT> else {<a name="line.231"></a> |
| <FONT color="green">232</FONT> // Remove oldest URI from reference Hashtable<a name="line.232"></a> |
| <FONT color="green">233</FONT> _references.remove(_URIs[_current]);<a name="line.233"></a> |
| <FONT color="green">234</FONT> // Insert our URI in circular buffer<a name="line.234"></a> |
| <FONT color="green">235</FONT> _URIs[_current] = uri;<a name="line.235"></a> |
| <FONT color="green">236</FONT> if (++_current >= _size) _current = 0;<a name="line.236"></a> |
| <FONT color="green">237</FONT> }<a name="line.237"></a> |
| <FONT color="green">238</FONT> _references.put(uri, doc);<a name="line.238"></a> |
| <FONT color="green">239</FONT> }<a name="line.239"></a> |
| <FONT color="green">240</FONT> <a name="line.240"></a> |
| <FONT color="green">241</FONT> /**<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> private synchronized void replaceDocument(String uri, CachedDocument doc) {<a name="line.244"></a> |
| <FONT color="green">245</FONT> CachedDocument old = (CachedDocument)_references.get(uri);<a name="line.245"></a> |
| <FONT color="green">246</FONT> if (doc == null)<a name="line.246"></a> |
| <FONT color="green">247</FONT> insertDocument(uri, doc);<a name="line.247"></a> |
| <FONT color="green">248</FONT> else<a name="line.248"></a> |
| <FONT color="green">249</FONT> _references.put(uri, doc);<a name="line.249"></a> |
| <FONT color="green">250</FONT> }<a name="line.250"></a> |
| <FONT color="green">251</FONT> <a name="line.251"></a> |
| <FONT color="green">252</FONT> /**<a name="line.252"></a> |
| <FONT color="green">253</FONT> * Returns a document either by finding it in the cache or<a name="line.253"></a> |
| <FONT color="green">254</FONT> * downloading it and putting it in the cache.<a name="line.254"></a> |
| <FONT color="green">255</FONT> */<a name="line.255"></a> |
| <FONT color="green">256</FONT> public DOM retrieveDocument(String baseURI, String href, Translet trs) {<a name="line.256"></a> |
| <FONT color="green">257</FONT> CachedDocument doc;<a name="line.257"></a> |
| <FONT color="green">258</FONT> <a name="line.258"></a> |
| <FONT color="green">259</FONT> String uri = href;<a name="line.259"></a> |
| <FONT color="green">260</FONT> if (baseURI != null && baseURI.length() != 0) {<a name="line.260"></a> |
| <FONT color="green">261</FONT> try {<a name="line.261"></a> |
| <FONT color="green">262</FONT> uri = SystemIDResolver.getAbsoluteURI(uri, baseURI);<a name="line.262"></a> |
| <FONT color="green">263</FONT> } catch (TransformerException te) {<a name="line.263"></a> |
| <FONT color="green">264</FONT> // ignore <a name="line.264"></a> |
| <FONT color="green">265</FONT> }<a name="line.265"></a> |
| <FONT color="green">266</FONT> }<a name="line.266"></a> |
| <FONT color="green">267</FONT> <a name="line.267"></a> |
| <FONT color="green">268</FONT> // Try to get the document from the cache first<a name="line.268"></a> |
| <FONT color="green">269</FONT> if ((doc = lookupDocument(uri)) == null) {<a name="line.269"></a> |
| <FONT color="green">270</FONT> doc = new CachedDocument(uri);<a name="line.270"></a> |
| <FONT color="green">271</FONT> if (doc == null) return null; // better error handling needed!!!<a name="line.271"></a> |
| <FONT color="green">272</FONT> doc.setLastModified(getLastModified(uri));<a name="line.272"></a> |
| <FONT color="green">273</FONT> insertDocument(uri, doc);<a name="line.273"></a> |
| <FONT color="green">274</FONT> }<a name="line.274"></a> |
| <FONT color="green">275</FONT> // If the document is in the cache we must check if it is still valid<a name="line.275"></a> |
| <FONT color="green">276</FONT> else {<a name="line.276"></a> |
| <FONT color="green">277</FONT> long now = System.currentTimeMillis();<a name="line.277"></a> |
| <FONT color="green">278</FONT> long chk = doc.getLastChecked();<a name="line.278"></a> |
| <FONT color="green">279</FONT> doc.setLastChecked(now);<a name="line.279"></a> |
| <FONT color="green">280</FONT> // Has the modification time for this file been checked lately?<a name="line.280"></a> |
| <FONT color="green">281</FONT> if (now > (chk + REFRESH_INTERVAL)) {<a name="line.281"></a> |
| <FONT color="green">282</FONT> doc.setLastChecked(now);<a name="line.282"></a> |
| <FONT color="green">283</FONT> long last = getLastModified(uri);<a name="line.283"></a> |
| <FONT color="green">284</FONT> // Reload document if it has been modified since last download<a name="line.284"></a> |
| <FONT color="green">285</FONT> if (last > doc.getLastModified()) {<a name="line.285"></a> |
| <FONT color="green">286</FONT> doc = new CachedDocument(uri);<a name="line.286"></a> |
| <FONT color="green">287</FONT> if (doc == null) return null;<a name="line.287"></a> |
| <FONT color="green">288</FONT> doc.setLastModified(getLastModified(uri));<a name="line.288"></a> |
| <FONT color="green">289</FONT> replaceDocument(uri, doc);<a name="line.289"></a> |
| <FONT color="green">290</FONT> }<a name="line.290"></a> |
| <FONT color="green">291</FONT> }<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> <a name="line.294"></a> |
| <FONT color="green">295</FONT> // Get the references to the actual DOM and DTD handler<a name="line.295"></a> |
| <FONT color="green">296</FONT> final DOM dom = doc.getDocument();<a name="line.296"></a> |
| <FONT color="green">297</FONT> <a name="line.297"></a> |
| <FONT color="green">298</FONT> // The dom reference may be null if the URL pointed to a<a name="line.298"></a> |
| <FONT color="green">299</FONT> // non-existing document<a name="line.299"></a> |
| <FONT color="green">300</FONT> if (dom == null) return null;<a name="line.300"></a> |
| <FONT color="green">301</FONT> <a name="line.301"></a> |
| <FONT color="green">302</FONT> doc.incAccessCount(); // For statistics<a name="line.302"></a> |
| <FONT color="green">303</FONT> <a name="line.303"></a> |
| <FONT color="green">304</FONT> final AbstractTranslet translet = (AbstractTranslet)trs;<a name="line.304"></a> |
| <FONT color="green">305</FONT> <a name="line.305"></a> |
| <FONT color="green">306</FONT> // Give the translet an early opportunity to extract any<a name="line.306"></a> |
| <FONT color="green">307</FONT> // information from the DOM object that it would like.<a name="line.307"></a> |
| <FONT color="green">308</FONT> translet.prepassDocument(dom);<a name="line.308"></a> |
| <FONT color="green">309</FONT> <a name="line.309"></a> |
| <FONT color="green">310</FONT> return(doc.getDocument());<a name="line.310"></a> |
| <FONT color="green">311</FONT> }<a name="line.311"></a> |
| <FONT color="green">312</FONT> <a name="line.312"></a> |
| <FONT color="green">313</FONT> /**<a name="line.313"></a> |
| <FONT color="green">314</FONT> * Outputs the cache statistics<a name="line.314"></a> |
| <FONT color="green">315</FONT> */<a name="line.315"></a> |
| <FONT color="green">316</FONT> public void getStatistics(PrintWriter out) {<a name="line.316"></a> |
| <FONT color="green">317</FONT> out.println("<h2>DOM cache statistics</h2><center><table border=\"2\">"+<a name="line.317"></a> |
| <FONT color="green">318</FONT> "<tr><td><b>Document URI</b></td>"+<a name="line.318"></a> |
| <FONT color="green">319</FONT> "<td><center><b>Build time</b></center></td>"+<a name="line.319"></a> |
| <FONT color="green">320</FONT> "<td><center><b>Access count</b></center></td>"+<a name="line.320"></a> |
| <FONT color="green">321</FONT> "<td><center><b>Last accessed</b></center></td>"+<a name="line.321"></a> |
| <FONT color="green">322</FONT> "<td><center><b>Last modified</b></center></td></tr>");<a name="line.322"></a> |
| <FONT color="green">323</FONT> <a name="line.323"></a> |
| <FONT color="green">324</FONT> for (int i=0; i<_count; i++) {<a name="line.324"></a> |
| <FONT color="green">325</FONT> CachedDocument doc = (CachedDocument)_references.get(_URIs[i]);<a name="line.325"></a> |
| <FONT color="green">326</FONT> out.print("<tr><td><a href=\""+_URIs[i]+"\">"+<a name="line.326"></a> |
| <FONT color="green">327</FONT> "<font size=-1>"+_URIs[i]+"</font></a></td>");<a name="line.327"></a> |
| <FONT color="green">328</FONT> out.print("<td><center>"+doc.getLatency()+"ms</center></td>");<a name="line.328"></a> |
| <FONT color="green">329</FONT> out.print("<td><center>"+doc.getAccessCount()+"</center></td>");<a name="line.329"></a> |
| <FONT color="green">330</FONT> out.print("<td><center>"+(new Date(doc.getLastReferenced()))+<a name="line.330"></a> |
| <FONT color="green">331</FONT> "</center></td>");<a name="line.331"></a> |
| <FONT color="green">332</FONT> out.print("<td><center>"+(new Date(doc.getLastModified()))+<a name="line.332"></a> |
| <FONT color="green">333</FONT> "</center></td>");<a name="line.333"></a> |
| <FONT color="green">334</FONT> out.println("</tr>");<a name="line.334"></a> |
| <FONT color="green">335</FONT> }<a name="line.335"></a> |
| <FONT color="green">336</FONT> <a name="line.336"></a> |
| <FONT color="green">337</FONT> out.println("</table></center>");<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> |
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| </PRE> |
| </BODY> |
| </HTML> |
