package net.sf.saxon.functions;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.ExpressionVisitor;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.Item;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.AtomicValue;
import net.sf.saxon.value.CalendarValue;
import net.sf.saxon.value.DayTimeDurationValue;
/**
* This class implements the XPath 2.0 functions
* adjust-date-to-timezone(), adjust-time-timezone(), and adjust-dateTime-timezone().
*/
public class Adjust extends SystemFunction {
/**
* Simplify and validate.
* @param visitor an expression visitor
*/
public Expression simplify(ExpressionVisitor visitor) throws XPathException {
return super.simplify(visitor);
}
/**
* Evaluate in a general context
*/
public Item evaluateItem(XPathContext context) throws XPathException {
AtomicValue av1 = (AtomicValue)argument[0].evaluateItem(context);
if (av1==null) {
return null;
}
CalendarValue in = (CalendarValue)av1;
int nargs = argument.length;
DayTimeDurationValue tz;
if (nargs==1) {
return in.adjustTimezone(context.getImplicitTimezone());
} else {
AtomicValue av2 = (AtomicValue)argument[1].evaluateItem(context);
if (av2==null) {
return in.removeTimezone();
}
tz = (DayTimeDurationValue)av2;
long microseconds = tz.getLengthInMicroseconds();
if (microseconds%60000000 != 0) {
XPathException err = new XPathException("Timezone is not an integral number of minutes");
err.setErrorCode("FODT0003");
err.setLocator(this);
err.setXPathContext(context);
throw err;
}
int tzminutes = (int)(microseconds / 60000000);
if (Math.abs(tzminutes) > 14*60) {
XPathException err = new XPathException("Timezone out of range (-14:00 to +14:00)");
err.setErrorCode("FODT0003");
err.setLocator(this);
err.setXPathContext(context);
throw err;
}
return in.adjustTimezone(tzminutes);
}
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//