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17 package org.apache.commons.jexl.parser;
18
19 import org.apache.commons.jexl.JexlContext;
20 import org.apache.commons.jexl.util.Coercion;
21
22 /***
23 * LT : a < b.
24 *
25 * Follows A.3.6.1 of the JSTL 1.0 specification
26 *
27 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
28 * @author <a href="mailto:proyal@apache.org">Peter Royal</a>
29 * @version $Id: ASTLTNode.java 398203 2006-04-29 16:44:55Z dion $
30 */
31 public class ASTLTNode extends SimpleNode {
32 /***
33 * Create the node given an id.
34 *
35 * @param id node id.
36 */
37 public ASTLTNode(int id) {
38 super(id);
39 }
40
41 /***
42 * Create a node with the given parser and id.
43 *
44 * @param p a parser.
45 * @param id node id.
46 */
47 public ASTLTNode(Parser p, int id) {
48 super(p, id);
49 }
50
51 /*** {@inheritDoc} */
52 public Object jjtAccept(ParserVisitor visitor, Object data) {
53 return visitor.visit(this, data);
54 }
55
56 /*** {@inheritDoc} */
57 public Object value(JexlContext jc) throws Exception {
58
59
60
61
62 Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
63 Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
64
65 if ((left == right) || (left == null) || (right == null)) {
66 return Boolean.FALSE;
67 } else if (Coercion.isFloatingPoint(left)
68 || Coercion.isFloatingPoint(right)) {
69 double leftDouble = Coercion.coerceDouble(left).doubleValue();
70 double rightDouble = Coercion.coerceDouble(right).doubleValue();
71
72 return leftDouble < rightDouble ? Boolean.TRUE : Boolean.FALSE;
73 } else if (Coercion.isNumberable(left) || Coercion.isNumberable(right)) {
74 long leftLong = Coercion.coerceLong(left).longValue();
75 long rightLong = Coercion.coerceLong(right).longValue();
76
77 return leftLong < rightLong ? Boolean.TRUE : Boolean.FALSE;
78 } else if (left instanceof String || right instanceof String) {
79 String leftString = left.toString();
80 String rightString = right.toString();
81
82 return leftString.compareTo(rightString) < 0 ? Boolean.TRUE
83 : Boolean.FALSE;
84 } else if (left instanceof Comparable) {
85 return ((Comparable) left).compareTo(right) < 0 ? Boolean.TRUE
86 : Boolean.FALSE;
87 } else if (right instanceof Comparable) {
88 return ((Comparable) right).compareTo(left) > 0 ? Boolean.TRUE
89 : Boolean.FALSE;
90 }
91
92 throw new Exception("Invalid comparison : LT ");
93 }
94 }