/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 {
/** {@inheritDoc} */
public int getRequiredArgsCount() {
return 1;
}
/** {@inheritDoc} */
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 NumberProperty.getInstance(r);
}
}