/*
* eXist Open Source Native XML Database
* Copyright (C) 2005-2009 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 program; if not, write to the Free Software Foundation
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
*/
package org.exist.xquery.functions;
import org.exist.dom.QName;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.Dependency;
import org.exist.xquery.Function;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Profiler;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.AbstractDateTimeValue;
import org.exist.xquery.value.DayTimeDurationValue;
import org.exist.xquery.value.FunctionReturnSequenceType;
import org.exist.xquery.value.FunctionParameterSequenceType;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
/**
* Implements the xpath-functions for timezone adjustment
*
*/
public class FunAdjustTimezone extends BasicFunction {
public final static FunctionParameterSequenceType DATE_TIME_01_PARAM = new FunctionParameterSequenceType("date-time", Type.DATE_TIME, Cardinality.ZERO_OR_ONE, "The date-time");
public final static FunctionParameterSequenceType DATE_01_PARAM = new FunctionParameterSequenceType("date", Type.DATE, Cardinality.ZERO_OR_ONE, "The date");
public final static FunctionParameterSequenceType TIME_01_PARAM = new FunctionParameterSequenceType("time", Type.TIME, Cardinality.ZERO_OR_ONE, "The time");
public final static FunctionParameterSequenceType DURATION_01_PARAM = new FunctionParameterSequenceType("duration", Type.DAY_TIME_DURATION, Cardinality.ZERO_OR_ONE, "The duration");
public final static FunctionReturnSequenceType DATE_TIME_01_RETURN = new FunctionReturnSequenceType(Type.DATE_TIME, Cardinality.ZERO_OR_ONE, "the adjusted date-time");
public final static FunctionReturnSequenceType DATE_01_RETURN = new FunctionReturnSequenceType(Type.DATE, Cardinality.ZERO_OR_ONE, "the adjusted date");
public final static FunctionReturnSequenceType TIME_01_RETURN = new FunctionReturnSequenceType(Type.TIME, Cardinality.ZERO_OR_ONE, "the adjusted time");
public final static FunctionSignature fnAdjustDateTimeToTimezone[] = {
new FunctionSignature(
new QName("adjust-dateTime-to-timezone", Function.BUILTIN_FUNCTION_NS),
"Adjusts the xs:dateTime value $date-time to the implicit timezone of the current locale.",
new SequenceType[] {
DATE_TIME_01_PARAM
},
DATE_TIME_01_RETURN),
new FunctionSignature(
new QName("adjust-dateTime-to-timezone", Function.BUILTIN_FUNCTION_NS),
"Adjusts the xs:dateTime value $date-time to a specific timezone, or to no timezone at all. " +
"If $duration is the empty sequence, returns an xs:dateTime without a timezone.",
new SequenceType[] {
DATE_TIME_01_PARAM,
DURATION_01_PARAM
},
DATE_TIME_01_RETURN)
};
public final static FunctionSignature fnAdjustDateToTimezone[] = {
new FunctionSignature(
new QName("adjust-date-to-timezone", Function.BUILTIN_FUNCTION_NS),
"Adjusts the xs:date value $date to the implicit timezone of the current locale.",
new SequenceType[] {
DATE_01_PARAM
},
DATE_01_RETURN),
new FunctionSignature(
new QName("adjust-date-to-timezone", Function.BUILTIN_FUNCTION_NS),
"Adjusts the xs:date value $date to a specific timezone, or to no timezone at all. " +
"If $duration is the empty sequence, returns an xs:date without a timezone.",
new SequenceType[] {
DATE_01_PARAM,
DURATION_01_PARAM
},
DATE_01_RETURN)
};
public final static FunctionSignature fnAdjustTimeToTimezone[] = {
new FunctionSignature(
new QName("adjust-time-to-timezone", Function.BUILTIN_FUNCTION_NS),
"Adjusts the xs:time value $time to the implicit timezone of the current locale.",
new SequenceType[] {
TIME_01_PARAM
},
TIME_01_RETURN),
new FunctionSignature(
new QName("adjust-time-to-timezone", Function.BUILTIN_FUNCTION_NS),
"Adjusts the xs:time value $time to a specific timezone, or to no timezone at all. " +
"If $duration is the empty sequence, returns an xs:time without a timezone.",
new SequenceType[] {
TIME_01_PARAM,
DURATION_01_PARAM
},
TIME_01_RETURN)
};
public FunAdjustTimezone(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
if (context.getProfiler().isEnabled()) {
context.getProfiler().start(this);
context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
if (contextSequence != null)
context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);
}
Sequence result;
if (args[0].isEmpty())
result =Sequence.EMPTY_SEQUENCE;
else {
AbstractDateTimeValue time = (AbstractDateTimeValue) args[0].itemAt(0);
if (getSignature().getArgumentCount() == 2) {
if (args[1].isEmpty())
result = time.withoutTimezone();
else {
DayTimeDurationValue offset = (DayTimeDurationValue) args[1].itemAt(0);
result = time.adjustedToTimezone(offset);
}
}
else
result = time.adjustedToTimezone(null);
}
if (context.getProfiler().isEnabled())
context.getProfiler().end(this, "", result);
return result;
}
}