/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 The eXist Project
* 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*/
package org.exist.xquery.functions.system;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.memtree.DocumentImpl;
import org.exist.memtree.NodeImpl;
import org.exist.memtree.SAXAdapter;
import org.exist.storage.statistics.IndexStatistics;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.Type;
import org.xml.sax.SAXException;
public class GetIndexStatistics extends BasicFunction {
protected final static Logger logger = Logger.getLogger(GetIndexStatistics.class);
public final static FunctionSignature signature = new FunctionSignature(
new QName("get-index-statistics", SystemModule.NAMESPACE_URI, SystemModule.PREFIX),
"Internal function",
null,
new FunctionReturnSequenceType(Type.NODE, Cardinality.ZERO_OR_ONE, "the resource containing the index statistics"));
public GetIndexStatistics(XQueryContext context) {
super(context, signature);
}
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
final IndexStatistics index = (IndexStatistics) context.getBroker().getBrokerPool().
getIndexManager().getIndexById(IndexStatistics.ID);
if (index == null) {
// module may not be enabled
return Sequence.EMPTY_SEQUENCE;
}
final SAXAdapter adapter = new SAXAdapter(context);
try {
adapter.startDocument();
index.toSAX(adapter);
adapter.endDocument();
} catch (final SAXException e) {
throw new XPathException(this, "Error caught while retrieving statistics: " + e.getMessage(), e);
}
final DocumentImpl doc = (DocumentImpl) adapter.getDocument();
return (NodeImpl) doc.getFirstChild();
}
}