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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.datatypes.Numeric;
import org.apache.fop.fo.properties.Property;
/**
* Class modelling the abs Number Function. See Sec. 5.10.1 of the XSL-FO spec.
*/
public class AbsFunction extends FunctionBase {
/**
* @return 1 (the number of arguments required for the abs function)
*/
public int nbArgs() {
return 1;
}
/**
* @param args array of arguments to be evaluated, the first of which
* should be a numeric value
* @param propInfo the PropertyInfo object to be evaluated
* @return the absolute value of the input
* @throws PropertyException for non-numeric input
*/
public Property eval(Property[] args,
PropertyInfo propInfo) throws PropertyException {
Numeric num = args[0].getNumeric();
if (num == null) {
throw new PropertyException("Non numeric operand to abs function");
}
// TODO: What if it has relative components (percent, table-col units)?
return (Property) NumericOp.abs(num);
}
}
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