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


1 /*
2  * Copyright 2002-2006 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 package org.apache.commons.jexl.parser;
17
18 import org.apache.commons.jexl.JexlContext;
19 import org.apache.commons.jexl.util.Coercion;
20
21 /**
22  * Not equal to. Use '!=' or 'ne', do not use <>.
23  *
24  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
25  * @version $Id: ASTNENode.java 398270 2006-04-30 03:02:58Z dion $
26  */
27 public class ASTNENode extends SimpleNode {
28     /**
29      * Create the node given an id.
30      *
31      * @param id node id.
32      */
33     public ASTNENode(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 ASTNENode(Parser p, int id) {
44         super(p, id);
45     }
46
47     /** {@inheritDoc} */
48     public Object JavaDoc jjtAccept(ParserVisitor visitor, Object JavaDoc data) {
49         return visitor.visit(this, data);
50     }
51
52     /** {@inheritDoc} */
53     public Object JavaDoc value(JexlContext pc) throws Exception JavaDoc {
54         Object JavaDoc left = ((SimpleNode) jjtGetChild(0)).value(pc);
55         Object JavaDoc right = ((SimpleNode) jjtGetChild(1)).value(pc);
56
57         if (left == null && right == null) {
58             /*
59              * first, the possibility that both *are* null
60              */
61
62             return Boolean.FALSE;
63         } else if (left == null || right == null) {
64             /*
65              * otherwise, both aren't, so it's clear L != R
66              */
67             return Boolean.TRUE;
68         } else if (left.getClass().equals(right.getClass())) {
69             return (left.equals(right)) ? Boolean.FALSE : Boolean.TRUE;
70         } else if (left instanceof Float JavaDoc
71             || left instanceof Double JavaDoc
72             || right instanceof Float JavaDoc
73             || right instanceof Double JavaDoc) {
74             return (Coercion.coerceDouble(left).equals(Coercion.coerceDouble(right))) ? Boolean.FALSE : Boolean.TRUE;
75         } else if (left instanceof Number JavaDoc || right instanceof Number JavaDoc || left instanceof Character JavaDoc
76             || right instanceof Character JavaDoc) {
77             return (Coercion.coerceLong(left).equals(Coercion.coerceLong(right))) ? Boolean.FALSE : Boolean.TRUE;
78         } else if (left instanceof Boolean JavaDoc || right instanceof Boolean JavaDoc) {
79             return (Coercion.coerceBoolean(left).equals(Coercion.coerceBoolean(right))) ? Boolean.FALSE : Boolean.TRUE;
80         } else if (left instanceof java.lang.String JavaDoc || right instanceof String JavaDoc) {
81             return (left.toString().equals(right.toString())) ? Boolean.FALSE : Boolean.TRUE;
82         }
83
84         return (left.equals(right)) ? Boolean.FALSE : Boolean.TRUE;
85     }
86 }
87
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