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 number division of nodes<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:jvanzyl@apache.org">Jason van Zyl</a>
35 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
36 * @version $Id: ASTDivNode.java 691048 2008-09-01 20:26:11Z nbubna $
37 */
38 public class ASTDivNode extends ASTMathNode
39 {
40 /**
41 * @param id
42 */
43 public ASTDivNode(int id)
44 {
45 super(id);
46 }
47
48 /**
49 * @param p
50 * @param id
51 */
52 public ASTDivNode(Parser p, int id)
53 {
54 super(p, id);
55 }
56
57 public Number perform(Number left, Number right, InternalContextAdapter context)
58 {
59 /*
60 * check for divide by 0
61 */
62 if (MathUtils.isZero(right))
63 {
64 String msg = "Right side of division operation is zero. Must be non-zero. "
65 + getLocation(context);
66 if (strictMode)
67 {
68 log.error(msg);
69 throw new MathException(msg);
70 }
71 else
72 {
73 log.debug(msg);
74 return null;
75 }
76 }
77 return MathUtils.divide(left, right);
78 }
79 }