package client.net.sf.saxon.ce.functions;
import client.net.sf.saxon.ce.expr.Expression;
import client.net.sf.saxon.ce.expr.ExpressionVisitor;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.value.AtomicValue;
import client.net.sf.saxon.ce.value.CalendarValue;
import client.net.sf.saxon.ce.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 {
public Adjust newInstance() {
return new Adjust();
}
/**
* 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) {
dynamicError("Timezone is not an integral number of minutes", "FODT0003", context);
}
int tzminutes = (int)(microseconds / 60000000);
if (Math.abs(tzminutes) > 14*60) {
dynamicError("Timezone out of range (-14:00 to +14:00)", "FODT0003", context);
}
return in.adjustTimezone(tzminutes);
}
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.