/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery.util;
import java.util.Iterator;
import org.apache.log4j.Logger;
import org.exist.dom.DocumentImpl;
import org.exist.dom.DocumentSet;
import org.exist.http.servlets.ResponseWrapper;
import org.exist.xquery.Variable;
import org.exist.xquery.XQuery;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.functions.response.ResponseModule;
import org.exist.xquery.value.JavaObjectValue;
import org.exist.xquery.value.Sequence;
/** A place holder for static utility functions related to HTTP.
* @author jmv */
public class HTTPUtils {
private final static Logger LOG = Logger.getLogger(XQuery.class);
/** Feature "Guess last modification time for an XQuery result";
* the HTTP header Last-Modified is filled with most recent time stamp among all
* XQuery documents appearing in the actual response.
* Note however, that the actual response can be influenced, through tests in the query,
* by documents more recent. */
public static void addLastModifiedHeader(Sequence result,
XQueryContext context) {
try {
final DocumentSet documentSet = result.getDocumentSet();
long mostRecentDocumentTime = 0;
for (final Iterator<DocumentImpl> i = documentSet.getDocumentIterator(); i.hasNext(); ) {
final DocumentImpl doc = i.next();
if (doc != null) {
mostRecentDocumentTime = Math.max(doc.getMetadata().getLastModified(),
mostRecentDocumentTime);
// LOG.debug("getFileName: " + doc.getFileName() + ", "
// + doc.getLastModified());
}
}
LOG.debug("mostRecentDocumentTime: " + mostRecentDocumentTime);
if (mostRecentDocumentTime > 0) {
final ResponseModule myModule = (ResponseModule) context
.getModule(ResponseModule.NAMESPACE_URI);
if (myModule == null)
{return;}
// response servlet object is read from global variable $response
final Variable var = myModule.resolveVariable(ResponseModule.RESPONSE_VAR);
if (var != null && var.getValue() != null) {
final JavaObjectValue value = (JavaObjectValue) var.getValue()
.itemAt(0);
if (value != null
&& value.getObject() instanceof ResponseWrapper) {
// have to take in account that if the header has allready been explicitely set
// by the XQuery script, we should not modify it .
final ResponseWrapper responseWrapper = ((ResponseWrapper) value.getObject());
if ( responseWrapper.getDateHeader("Last-Modified") == 0 )
{responseWrapper.setDateHeader(
"Last-Modified", mostRecentDocumentTime);}
}
}
}
} catch (final Exception e) {
LOG.debug(e.getMessage(), e);
}
}
public static String printStackTraceHTML(Throwable e) {
final StringBuilder buf = new StringBuilder();
final StackTraceElement[] trace = e.getStackTrace();
buf.append("<table id=\"javatrace\">");
buf.append("<caption>Java Stack Trace:</caption>");
buf.append("<tr><th>Class Name</th><th>Method Name</th><th>File Name</th><th>Line</th></tr>");
for (int i = 0; i < trace.length && i < 20; i++) {
buf.append("<tr>");
buf.append("<td class=\"class\">").append(trace[i].getClassName()).append("</td>");
buf.append("<td class=\"method\">").append(trace[i].getMethodName()).append("</td>");
buf.append("<td class=\"file\">").append(trace[i].getFileName() == null ? "Unknown" : trace[i].getFileName()).append("</td>");
buf.append("<td class=\"line\">");
buf.append(trace[i].getLineNumber() < 0 ? "Unavailable" : Integer.toString(trace[i].getLineNumber()));
buf.append("</td>");
buf.append("</tr>");
}
buf.append("</table>");
return buf.toString();
}
}