1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * 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 package org.apache.commons.jexl.parser;
18
19 import org.apache.commons.jexl.util.Coercion;
20 import org.apache.commons.jexl.JexlContext;
21
22 /**
23 * a / b, mathematical divide.
24 *
25 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26 * @version $Id: ASTDivNode.java 480412 2006-11-29 05:11:23Z bayard $
27 */
28 public class ASTDivNode extends SimpleNode {
29 /**
30 * Create the node given an id.
31 *
32 * @param id node id.
33 */
34 public ASTDivNode(int id) {
35 super(id);
36 }
37
38 /**
39 * Create a node with the given parser and id.
40 *
41 * @param p a parser.
42 * @param id node id.
43 */
44 public ASTDivNode(Parser p, int id) {
45 super(p, id);
46 }
47
48 /** {@inheritDoc} */
49 public Object jjtAccept(ParserVisitor visitor, Object data) {
50 return visitor.visit(this, data);
51 }
52
53 /** {@inheritDoc} */
54 public Object value(JexlContext jc) throws Exception {
55 Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
56 Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
57
58 /*
59 * the spec says 'and', I think 'or'
60 */
61 if (left == null && right == null) {
62 return new Byte((byte) 0);
63 }
64
65 Double l = Coercion.coerceDouble(left);
66 Double r = Coercion.coerceDouble(right);
67
68 /*
69 * catch div/0
70 */
71 if (r.doubleValue() == 0.0) {
72 return new Double(0.0);
73 }
74
75 return new Double(l.doubleValue() / r.doubleValue());
76
77 }
78 }