1
2
3
4
5
6
7
8
9
10
11
12
13
14
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 * GT : 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: ASTGTNode.java,v 1.5 2004/02/28 13:45:20 yoavs Exp $
29 */
30 public class ASTGTNode extends SimpleNode
31 {
32 public ASTGTNode( int id )
33 {
34 super( id );
35 }
36
37 public ASTGTNode( Parser p, int id )
38 {
39 super( p, id );
40 }
41
42 /*** Accept the visitor. **/
43 public Object jjtAccept( ParserVisitor visitor, Object data )
44 {
45 return visitor.visit( this, data );
46 }
47
48 public Object value( JexlContext jc )
49 throws Exception
50 {
51
52
53
54
55 Object left = ( (SimpleNode)jjtGetChild( 0 ) ).value( jc );
56 Object right = ( (SimpleNode)jjtGetChild( 1 ) ).value( jc );
57
58 if( ( left == right ) || ( left == null ) || ( right == null ) )
59 {
60 return Boolean.FALSE;
61 }
62 else if( Coercion.isFloatingPoint( left ) || Coercion.isFloatingPoint( right ) )
63 {
64 double leftDouble = Coercion.coerceDouble( left ).doubleValue();
65 double rightDouble = Coercion.coerceDouble( right ).doubleValue();
66
67 return leftDouble > rightDouble
68 ? Boolean.TRUE
69 : Boolean.FALSE;
70 }
71 else if( Coercion.isNumberable( left ) || Coercion.isNumberable( right ) )
72 {
73 long leftLong = Coercion.coerceLong( left ).longValue();
74 long rightLong = Coercion.coerceLong( right ).longValue();
75
76 return leftLong > rightLong
77 ? Boolean.TRUE
78 : Boolean.FALSE;
79 }
80 else if( left instanceof String || right instanceof String )
81 {
82 String leftString = left.toString();
83 String rightString = right.toString();
84
85 return leftString.compareTo( rightString ) > 0
86 ? Boolean.TRUE
87 : Boolean.FALSE;
88 }
89 else if( left instanceof Comparable )
90 {
91 return ( (Comparable)left ).compareTo( right ) > 0
92 ? Boolean.TRUE
93 : Boolean.FALSE;
94 }
95 else if( right instanceof Comparable )
96 {
97 return ( (Comparable)right ).compareTo( left ) < 0
98 ? Boolean.TRUE
99 : Boolean.FALSE;
100 }
101
102 throw new Exception( "Invalid comparison : GT " );
103 }
104 }