View Javadoc

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 jjtAccept(ParserVisitor visitor, Object data) {
49          return visitor.visit(this, data);
50      }
51  
52      /*** {@inheritDoc} */
53      public Object value(JexlContext pc) throws Exception {
54          Object left = ((SimpleNode) jjtGetChild(0)).value(pc);
55          Object 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 
71              || left instanceof Double 
72              || right instanceof Float 
73              || right instanceof Double) {
74              return (Coercion.coerceDouble(left).equals(Coercion.coerceDouble(right))) ? Boolean.FALSE : Boolean.TRUE;
75          } else if (left instanceof Number || right instanceof Number || left instanceof Character
76              || right instanceof Character) {
77              return (Coercion.coerceLong(left).equals(Coercion.coerceLong(right))) ? Boolean.FALSE : Boolean.TRUE;
78          } else if (left instanceof Boolean || right instanceof Boolean) {
79              return (Coercion.coerceBoolean(left).equals(Coercion.coerceBoolean(right))) ? Boolean.FALSE : Boolean.TRUE;
80          } else if (left instanceof java.lang.String || right instanceof String) {
81              return (left.toString().equals(right.toString())) ? Boolean.FALSE : Boolean.TRUE;
82          }
83  
84          return (left.equals(right)) ? Boolean.FALSE : Boolean.TRUE;
85      }
86  }