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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 * LE : 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: ASTLENode.java,v 1.4 2004/02/28 13:45:20 yoavs Exp $
29 */
30 public class ASTLENode extends SimpleNode
31 {
32 public ASTLENode(int id)
33 {
34 super(id);
35 }
36
37 public ASTLENode(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 )
59 {
60 return Boolean.TRUE;
61 }
62 else if ( ( left == null ) || ( right == null ) )
63 {
64 return Boolean.FALSE;
65 }
66 else if( Coercion.isFloatingPoint( left ) || Coercion.isFloatingPoint( right ) )
67 {
68 double leftDouble = Coercion.coerceDouble( left ).doubleValue();
69 double rightDouble = Coercion.coerceDouble( right ).doubleValue();
70
71 return leftDouble <= rightDouble
72 ? Boolean.TRUE
73 : Boolean.FALSE;
74 }
75 else if( Coercion.isNumberable( left ) || Coercion.isNumberable( right ) )
76 {
77 long leftLong = Coercion.coerceLong( left ).longValue();
78 long rightLong = Coercion.coerceLong( right ).longValue();
79
80 return leftLong <= rightLong
81 ? Boolean.TRUE
82 : Boolean.FALSE;
83 }
84 else if( left instanceof String || right instanceof String )
85 {
86 String leftString = left.toString();
87 String rightString = right.toString();
88
89 return leftString.compareTo( rightString ) <= 0
90 ? Boolean.TRUE
91 : Boolean.FALSE;
92 }
93 else if( left instanceof Comparable )
94 {
95 return ( (Comparable)left ).compareTo( right ) <= 0
96 ? Boolean.TRUE
97 : Boolean.FALSE;
98 }
99 else if( right instanceof Comparable )
100 {
101 return ( (Comparable)right ).compareTo( left ) >= 0
102 ? Boolean.TRUE
103 : Boolean.FALSE;
104 }
105
106 throw new Exception("Invalid comparison : LE ");
107 }
108
109 }