01: /*
02: * Copyright 2003-2006 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: package org.apache.commons.jexl.parser;
17:
18: import org.apache.commons.jexl.util.Coercion;
19: import org.apache.commons.jexl.JexlContext;
20:
21: /**
22: * a / b, mathematical divide.
23: *
24: * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
25: * @version $Id: ASTDivNode.java 398187 2006-04-29 15:58:45Z dion $
26: */
27: public class ASTDivNode extends SimpleNode {
28: /**
29: * Create the node given an id.
30: *
31: * @param id node id.
32: */
33: public ASTDivNode(int id) {
34: super (id);
35: }
36:
37: /**
38: * Create a node with the given parser and id.
39: *
40: * @param p a parser.
41: * @param id node id.
42: */
43: public ASTDivNode(Parser p, int id) {
44: super (p, id);
45: }
46:
47: /** {@inheritDoc} */
48: public Object jjtAccept(ParserVisitor visitor, Object data) {
49: return visitor.visit(this , data);
50: }
51:
52: /** {@inheritDoc} */
53: public Object value(JexlContext jc) throws Exception {
54: Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
55: Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
56:
57: /*
58: * the spec says 'and', I think 'or'
59: */
60: if (left == null && right == null) {
61: return new Byte((byte) 0);
62: }
63:
64: Double l = Coercion.coerceDouble(left);
65: Double r = Coercion.coerceDouble(right);
66:
67: /*
68: * catch div/0
69: */
70: if (r.doubleValue() == 0.0) {
71: return new Double(0.0);
72: }
73:
74: return new Double(l.doubleValue() / r.doubleValue());
75:
76: }
77: }
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