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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.fo.expr;
import org.apache.fop.fo.properties.NumberProperty;
import org.apache.fop.fo.properties.Property;
class RoundFunction extends FunctionBase {
public int nbArgs() {
return 1;
}
public Property eval(Property[] args,
PropertyInfo pInfo) throws PropertyException {
Number dbl = args[0].getNumber();
if (dbl == null) {
throw new PropertyException("Non number operand to round function");
}
double n = dbl.doubleValue();
double r = Math.floor(n + 0.5);
if (r == 0.0 && n < 0.0) {
r = -r; // round(-0.2) returns -0 not 0
}
return new NumberProperty(r);
}
}
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