/*
* eXist Open Source Native XML Database
* Copyright (C) 2007-09 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.modules.datetime;
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.DateTimeValue;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.StringValue;
import org.exist.xquery.value.Type;
import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;
/**
* @author Adam Retter <adam@exist-db.org>
* @version 1.1
*/
public class FormatDateTimeFunction extends BasicFunction
{
protected static final Logger logger = Logger.getLogger(FormatDateTimeFunction.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName("format-dateTime", DateTimeModule.NAMESPACE_URI, DateTimeModule.PREFIX),
"Returns a xs:string of the xs:dateTime according to the SimpleDateFormat format.",
new SequenceType[] {
new FunctionParameterSequenceType("date-time", Type.DATE_TIME, Cardinality.EXACTLY_ONE, "The dateTime to to be formatted."),
new FunctionParameterSequenceType("simple-date-format", Type.STRING, Cardinality.EXACTLY_ONE, "The format string according to the Java java.text.SimpleDateFormat class")
},
new FunctionReturnSequenceType(Type.STRING, Cardinality.EXACTLY_ONE, "the formatted dateTime string"));
public FormatDateTimeFunction(XQueryContext context)
{
super(context, signature);
}
@Override
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException
{
DateTimeValue dt = (DateTimeValue)args[0].itemAt(0);
String dateTimeFormat = args[1].itemAt(0).toString();
SimpleDateFormat sdf = new SimpleDateFormat(dateTimeFormat);
GregorianCalendar cal = dt.calendar.toGregorianCalendar();
String formattedDate = sdf.format(cal.getTime());
return new StringValue(formattedDate);
}
}