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: RoundFunction.java 554251 2007-07-07 20:13:41Z adelmelle $ */
19:
20: package org.apache.fop.fo.expr;
21:
22: import org.apache.fop.fo.properties.NumberProperty;
23: import org.apache.fop.fo.properties.Property;
24:
25: class RoundFunction extends FunctionBase {
26: public int nbArgs() {
27: return 1;
28: }
29:
30: public Property eval(Property[] args, PropertyInfo pInfo)
31: throws PropertyException {
32: Number dbl = args[0].getNumber();
33: if (dbl == null) {
34: throw new PropertyException(
35: "Non number operand to round function");
36: }
37: double n = dbl.doubleValue();
38: double r = Math.floor(n + 0.5);
39: if (r == 0.0 && n < 0.0) {
40: r = -r; // round(-0.2) returns -0 not 0
41: }
42: return NumberProperty.getInstance(r);
43: }
44:
45: }
|