package client.net.sf.saxon.ce.functions;
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.NumericValue;
/**
* This class supports the ceiling(), floor(), round(), and round-to-half-even() functions,
* and also the abs() function
*/
public final class Rounding extends SystemFunction {
public Rounding(int operation) {
this.operation = operation;
}
public Rounding newInstance() {
return new Rounding(operation);
}
public static final int FLOOR = 0;
public static final int CEILING = 1;
public static final int ROUND = 2;
public static final int HALF_EVEN = 3;
public static final int ABS = 4;
/**
* Evaluate the function
*/
public Item evaluateItem(XPathContext context) throws XPathException {
AtomicValue val0 = (AtomicValue)argument[0].evaluateItem(context);
if (val0 == null) {
return null;
}
NumericValue val = (NumericValue)val0;
switch (operation) {
case FLOOR:
return val.floor();
case CEILING:
return val.ceiling();
case ROUND:
return val.round();
case HALF_EVEN:
int scale = 0;
if (argument.length==2) {
AtomicValue scaleVal0 = (AtomicValue)argument[1].evaluateItem(context);
NumericValue scaleVal = (NumericValue)scaleVal0;
scale = (int)scaleVal.intValue();
}
return val.roundHalfToEven(scale);
case ABS:
return val.abs();
default:
throw new UnsupportedOperationException("Unknown rounding function");
}
}
/**
* Determine the cardinality of the function.
*/
public int computeCardinality() {
return argument[0].getCardinality();
}
}
// 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.