01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17:
18: /* $Id: AbsFunction.java 426576 2006-07-28 15:44:37Z jeremias $ */
19:
20: package org.apache.fop.fo.expr;
21:
22: import org.apache.fop.datatypes.Numeric;
23: import org.apache.fop.fo.properties.Property;
24:
25: /**
26: * Class modelling the abs Number Function. See Sec. 5.10.1 of the XSL-FO spec.
27: */
28: public class AbsFunction extends FunctionBase {
29:
30: /**
31: * @return 1 (the number of arguments required for the abs function)
32: */
33: public int nbArgs() {
34: return 1;
35: }
36:
37: /**
38: * @param args array of arguments to be evaluated, the first of which
39: * should be a numeric value
40: * @param propInfo the PropertyInfo object to be evaluated
41: * @return the absolute value of the input
42: * @throws PropertyException for non-numeric input
43: */
44: public Property eval(Property[] args, PropertyInfo propInfo)
45: throws PropertyException {
46: Numeric num = args[0].getNumeric();
47: if (num == null) {
48: throw new PropertyException(
49: "Non numeric operand to abs function");
50: }
51: // TODO: What if it has relative components (percent, table-col units)?
52: return (Property) NumericOp.abs(num);
53: }
54:
55: }
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