| Methods Summary |
|---|
| private final long | getLastModified(java.lang.String uri)Returns the time-stamp for a document's last update
try {
URL url = new URL(uri);
URLConnection connection = url.openConnection();
long timestamp = connection.getLastModified();
// Check for a "file:" URI (courtesy of Brian Ewins)
if (timestamp == 0){ // get 0 for local URI
if ("file".equals(url.getProtocol())){
File localfile = new File(URLDecoder.decode(url.getFile()));
timestamp = localfile.lastModified();
}
}
return(timestamp);
}
// Brutal handling of all exceptions
catch (Exception e) {
return(System.currentTimeMillis());
}
|
| public void | getStatistics(java.io.PrintWriter out)Outputs the cache statistics
out.println("<h2>DOM cache statistics</h2><center><table border=\"2\">"+
"<tr><td><b>Document URI</b></td>"+
"<td><center><b>Build time</b></center></td>"+
"<td><center><b>Access count</b></center></td>"+
"<td><center><b>Last accessed</b></center></td>"+
"<td><center><b>Last modified</b></center></td></tr>");
for (int i=0; i<_count; i++) {
CachedDocument doc = (CachedDocument)_references.get(_URIs[i]);
out.print("<tr><td><a href=\""+_URIs[i]+"\">"+
"<font size=-1>"+_URIs[i]+"</font></a></td>");
out.print("<td><center>"+doc.getLatency()+"ms</center></td>");
out.print("<td><center>"+doc.getAccessCount()+"</center></td>");
out.print("<td><center>"+(new Date(doc.getLastReferenced()))+
"</center></td>");
out.print("<td><center>"+(new Date(doc.getLastModified()))+
"</center></td>");
out.println("</tr>");
}
out.println("</table></center>");
|
| private synchronized void | insertDocument(java.lang.String uri, com.sun.org.apache.xalan.internal.xsltc.dom.DocumentCache$CachedDocument doc)
if (_count < _size) {
// Insert out URI in circular buffer
_URIs[_count++] = uri;
_current = 0;
}
else {
// Remove oldest URI from reference Hashtable
_references.remove(_URIs[_current]);
// Insert our URI in circular buffer
_URIs[_current] = uri;
if (++_current >= _size) _current = 0;
}
_references.put(uri, doc);
|
| private com.sun.org.apache.xalan.internal.xsltc.dom.DocumentCache$CachedDocument | lookupDocument(java.lang.String uri)
return((CachedDocument)_references.get(uri));
|
| private synchronized void | replaceDocument(java.lang.String uri, com.sun.org.apache.xalan.internal.xsltc.dom.DocumentCache$CachedDocument doc)
CachedDocument old = (CachedDocument)_references.get(uri);
if (doc == null)
insertDocument(uri, doc);
else
_references.put(uri, doc);
|
| public com.sun.org.apache.xalan.internal.xsltc.DOM | retrieveDocument(java.lang.String baseURI, java.lang.String href, com.sun.org.apache.xalan.internal.xsltc.Translet trs)Returns a document either by finding it in the cache or
downloading it and putting it in the cache.
CachedDocument doc;
String uri = href;
if (baseURI != null && !baseURI.equals("")) {
try {
uri = SystemIDResolver.getAbsoluteURI(uri, baseURI);
} catch (TransformerException te) {
// ignore
}
}
// Try to get the document from the cache first
if ((doc = lookupDocument(uri)) == null) {
doc = new CachedDocument(uri);
if (doc == null) return null; // better error handling needed!!!
doc.setLastModified(getLastModified(uri));
insertDocument(uri, doc);
}
// If the document is in the cache we must check if it is still valid
else {
long now = System.currentTimeMillis();
long chk = doc.getLastChecked();
doc.setLastChecked(now);
// Has the modification time for this file been checked lately?
if (now > (chk + REFRESH_INTERVAL)) {
doc.setLastChecked(now);
long last = getLastModified(uri);
// Reload document if it has been modified since last download
if (last > doc.getLastModified()) {
doc = new CachedDocument(uri);
if (doc == null) return null;
doc.setLastModified(getLastModified(uri));
replaceDocument(uri, doc);
}
}
}
// Get the references to the actual DOM and DTD handler
final DOM dom = doc.getDocument();
// The dom reference may be null if the URL pointed to a
// non-existing document
if (dom == null) return null;
doc.incAccessCount(); // For statistics
final AbstractTranslet translet = (AbstractTranslet)trs;
// Give the translet an early opportunity to extract any
// information from the DOM object that it would like.
translet.prepassDocument(dom);
return(doc.getDocument());
|
