/*
* eXist Open Source Native XML Database
* Copyright (C) 2010 eXist-db team
* http://exist.sourceforge.net
*
* 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.functions.system;
import java.util.Calendar;
import javax.xml.datatype.XMLGregorianCalendar;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
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.DayTimeDurationValue;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.Type;
/**
* Return the duration since eXist was started
*
* @author Adam Retter <adam@existsolutions.com>
*/
public class GetUptime extends BasicFunction {
protected final static Logger logger = Logger.getLogger(GetUptime.class);
public final static FunctionSignature signature = new FunctionSignature(
new QName("get-uptime", SystemModule.NAMESPACE_URI, SystemModule.PREFIX),
"Returns the time since eXist-db was started. The value is stable over the lifetime of a query.",
FunctionSignature.NO_ARGS,
new FunctionReturnSequenceType(Type.DAY_TIME_DURATION, Cardinality.EXACTLY_ONE, "the duration since eXist-db was started")
);
public GetUptime(XQueryContext context) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
final Calendar startupTime = context.getBroker().getBrokerPool().getStartupTime();
final XMLGregorianCalendar xmlNow = context.getCalendar();
final Calendar now = xmlNow.toGregorianCalendar();
final long duration = now.getTimeInMillis() - startupTime.getTimeInMillis();
return new DayTimeDurationValue(duration);
}
}