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Java > Open Source Codes > org > apache > commons > jexl > parser > ASTModNode


1 /*
2  * Copyright 2003-2006 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
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
17 package org.apache.commons.jexl.parser;
18
19 import org.apache.commons.jexl.JexlContext;
20 import org.apache.commons.jexl.util.Coercion;
21
22 /**
23  * % (mod).
24  *
25  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26  * @version $Id: ASTModNode.java 398206 2006-04-29 16:51:38Z dion $
27  */
28 public class ASTModNode extends SimpleNode {
29     /**
30      * Create the node given an id.
31      *
32      * @param id node id.
33      */
34     public ASTModNode(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 ASTModNode(Parser p, int id) {
45         super(p, id);
46     }
47
48     /** {@inheritDoc} */
49     public Object JavaDoc jjtAccept(ParserVisitor visitor, Object JavaDoc data) {
50         return visitor.visit(this, data);
51     }
52
53     /** {@inheritDoc} */
54     public Object JavaDoc value(JexlContext jc) throws Exception JavaDoc {
55         Object JavaDoc left = ((SimpleNode) jjtGetChild(0)).value(jc);
56         Object JavaDoc 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 JavaDoc((byte) 0);
63         }
64
65         /*
66          * if anything is float, double or string with ( "." | "E" | "e") coerce
67          * all to doubles and do it
68          */
69         if (left instanceof Float JavaDoc
70             || left instanceof Double JavaDoc
71             || right instanceof Float JavaDoc
72             || right instanceof Double JavaDoc
73             || (left instanceof String JavaDoc
74                 && (((String JavaDoc) left).indexOf(".") != -1
75                     || ((String JavaDoc) left).indexOf("e") != -1
76                     || ((String JavaDoc) left).indexOf("E") != -1))
77             || (right instanceof String JavaDoc
78                 && (((String JavaDoc) right).indexOf(".") != -1
79                     || ((String JavaDoc) right).indexOf("e") != -1
80                     || ((String JavaDoc) right).indexOf("E") != -1))) {
81             Double JavaDoc l = Coercion.coerceDouble(left);
82             Double JavaDoc r = Coercion.coerceDouble(right);
83
84             /*
85              * catch div/0
86              */
87             if (r.doubleValue() == 0.0) {
88                 return new Double JavaDoc(0.0);
89             }
90
91             return new Double JavaDoc(l.doubleValue() % r.doubleValue());
92         }
93
94         /*
95          * otherwise to longs with thee!
96          */
97
98         Long JavaDoc l = Coercion.coerceLong(left);
99         Long JavaDoc r = Coercion.coerceLong(right);
100
101         /*
102          * catch the div/0
103          */
104         if (r.longValue() == 0) {
105             return new Long JavaDoc(0);
106         }
107
108         return new Long JavaDoc(l.longValue() % r.longValue());
109     }
110
111 }
112
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