01: /*
02: * Copyright 2002-2006 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: * 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 398197 2006-04-29 16:18:04Z dion $
29: */
30: public class ASTGTNode extends SimpleNode {
31: /**
32: * Create the node given an id.
33: *
34: * @param id node id.
35: */
36: public ASTGTNode(int id) {
37: super (id);
38: }
39:
40: /**
41: * Create a node with the given parser and id.
42: *
43: * @param p a parser.
44: * @param id node id.
45: */
46: public ASTGTNode(Parser p, int id) {
47: super (p, id);
48: }
49:
50: /** {@inheritDoc} */
51: public Object jjtAccept(ParserVisitor visitor, Object data) {
52: return visitor.visit(this , data);
53: }
54:
55: /** {@inheritDoc} */
56: public Object value(JexlContext jc) throws Exception {
57: /*
58: * now get the values
59: */
60:
61: Object left = ((SimpleNode) jjtGetChild(0)).value(jc);
62: Object right = ((SimpleNode) jjtGetChild(1)).value(jc);
63:
64: if ((left == right) || (left == null) || (right == null)) {
65: return Boolean.FALSE;
66: } else if (Coercion.isFloatingPoint(left)
67: || Coercion.isFloatingPoint(right)) {
68: double leftDouble = Coercion.coerceDouble(left)
69: .doubleValue();
70: double rightDouble = Coercion.coerceDouble(right)
71: .doubleValue();
72:
73: return leftDouble > rightDouble ? Boolean.TRUE
74: : Boolean.FALSE;
75: } else if (Coercion.isNumberable(left)
76: || Coercion.isNumberable(right)) {
77: long leftLong = Coercion.coerceLong(left).longValue();
78: long rightLong = Coercion.coerceLong(right).longValue();
79:
80: return leftLong > rightLong ? Boolean.TRUE : Boolean.FALSE;
81: } else if (left instanceof String || right instanceof String) {
82: String leftString = left.toString();
83: String rightString = right.toString();
84:
85: return leftString.compareTo(rightString) > 0 ? Boolean.TRUE
86: : Boolean.FALSE;
87: } else if (left instanceof Comparable) {
88: return ((Comparable) left).compareTo(right) > 0 ? Boolean.TRUE
89: : Boolean.FALSE;
90: } else if (right instanceof Comparable) {
91: return ((Comparable) right).compareTo(left) < 0 ? Boolean.TRUE
92: : Boolean.FALSE;
93: }
94:
95: throw new Exception("Invalid comparison : GT ");
96: }
97: }
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