1 package org.apache.velocity.runtime.parser.node;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.velocity.context.InternalContextAdapter;
23 import org.apache.velocity.exception.MathException;
24 import org.apache.velocity.runtime.parser.Parser;
25
26 /**
27 * Handles modulus division<br><br>
28 *
29 * Please look at the Parser.jjt file which is
30 * what controls the generation of this class.
31 *
32 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
33 * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
34 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
35 * @version $Id: ASTModNode.java 691048 2008-09-01 20:26:11Z nbubna $
36 */
37 public class ASTModNode extends ASTMathNode
38 {
39 /**
40 * @param id
41 */
42 public ASTModNode(int id)
43 {
44 super(id);
45 }
46
47 /**
48 * @param p
49 * @param id
50 */
51 public ASTModNode(Parser p, int id)
52 {
53 super(p, id);
54 }
55
56 public Number perform(Number left, Number right, InternalContextAdapter context)
57 {
58 /*
59 * check for divide / modulo by 0
60 */
61 if (MathUtils.isZero(right))
62 {
63 String msg = "Right side of modulus operation is zero. Must be non-zero. "
64 + getLocation(context);
65 if (strictMode)
66 {
67 log.error(msg);
68 throw new MathException(msg);
69 }
70 else
71 {
72 log.debug(msg);
73 return null;
74 }
75 }
76 return MathUtils.modulo(left, right);
77 }
78 }
79