package client.net.sf.saxon.ce.functions;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.expr.sort.GenericAtomicComparer;
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.IntegerValue;
/**
* XSLT 2.0 compare() function
*/
// Supports string comparison using a collation
public class Compare extends CollatingFunction {
@Override
public Compare newInstance() {
return new Compare();
}
/**
* Evaluate the expression
*/
public Item evaluateItem(XPathContext context) throws XPathException {
AtomicValue arg0 = (AtomicValue)argument[0].evaluateItem(context);
if (arg0==null) {
return null;
}
AtomicValue arg1 = (AtomicValue)argument[1].evaluateItem(context);
if (arg1==null) {
return null;
}
GenericAtomicComparer collator = getAtomicComparer(2, context);
int result = collator.compareAtomicValues(arg0, arg1);
if (result < 0) {
return IntegerValue.MINUS_ONE;
} else if (result > 0) {
return IntegerValue.PLUS_ONE;
} else {
return IntegerValue.ZERO;
}
}
}
// 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.