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1   /*
2    * Copyright 2002,2004 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   *  GE : a >= b
23   *
24   *  Follows A.3.6.1 of the JSTL 1.0 specification
25   *
26   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
27   *  @author <a href="mailto:proyal@apache.org">Peter Royal</a>
28   *  @version $Id: ASTGENode.java,v 1.4 2004/02/28 13:45:20 yoavs Exp $
29   */
30  public class ASTGENode extends SimpleNode
31  {
32      public ASTGENode(int id)
33      {
34          super(id);
35      }
36  
37      public ASTGENode(Parser p, int id)
38      {
39          super(p, id);
40      }
41  
42  
43      /*** Accept the visitor. **/
44      public Object jjtAccept(ParserVisitor visitor, Object data)
45      {
46          return visitor.visit(this, data);
47      }
48  
49      public Object value(JexlContext jc)
50          throws Exception
51      {
52          /*
53           * now get the values
54           */
55  
56          Object left = ( (SimpleNode) jjtGetChild(0)).value(jc);
57          Object right = ( (SimpleNode) jjtGetChild(1)).value(jc);
58  
59          if( left == right )
60          {
61              return Boolean.TRUE;
62          }
63          else if ( ( left == null ) || ( right == null ) )
64          {
65              return Boolean.FALSE;
66          }
67          else if( Coercion.isFloatingPoint( left ) || Coercion.isFloatingPoint( right ) )
68          {
69              double leftDouble = Coercion.coerceDouble( left ).doubleValue();
70              double rightDouble = Coercion.coerceDouble( right ).doubleValue();
71  
72              return leftDouble >= rightDouble
73                  ? Boolean.TRUE
74                  : Boolean.FALSE;
75          }
76          else if( Coercion.isNumberable( left ) || Coercion.isNumberable( right ) )
77          {
78              long leftLong = Coercion.coerceLong( left ).longValue();
79              long rightLong = Coercion.coerceLong( right ).longValue();
80  
81              return leftLong >= rightLong
82                  ? Boolean.TRUE
83                  : Boolean.FALSE;
84          }
85          else if( left instanceof String || right instanceof String )
86          {
87              String leftString = left.toString();
88              String rightString = right.toString();
89  
90              return leftString.compareTo( rightString ) >= 0
91                  ? Boolean.TRUE
92                  : Boolean.FALSE;
93          }
94          else if( left instanceof Comparable )
95          {
96              return ( (Comparable)left ).compareTo( right ) >= 0
97                  ? Boolean.TRUE
98                  : Boolean.FALSE;
99          }
100         else if( right instanceof Comparable )
101         {
102             return ( (Comparable)right ).compareTo( left ) <= 0
103                 ? Boolean.TRUE
104                 : Boolean.FALSE;
105         }
106 
107         throw new Exception("Invalid comparison : GE ");
108     }
109 
110 }