1 package org.apache.velocity.runtime.parser.node;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.velocity.context.InternalContextAdapter;
23 import org.apache.velocity.exception.MethodInvocationException;
24 import org.apache.velocity.runtime.parser.Parser;
25 import org.apache.velocity.util.TemplateNumber;
26
27 /**
28 * Handles arg1 <= arg2<br><br>
29 *
30 * Only subclasses of Number can be compared.<br><br>
31 *
32 * Please look at the Parser.jjt file which is
33 * what controls the generation of this class.
34 *
35 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
36 * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
37 */
38
39 public class ASTLENode extends SimpleNode
40 {
41 /**
42 * @param id
43 */
44 public ASTLENode(int id)
45 {
46 super(id);
47 }
48
49 /**
50 * @param p
51 * @param id
52 */
53 public ASTLENode(Parser p, int id)
54 {
55 super(p, id);
56 }
57
58
59 /**
60 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
61 */
62 public Object jjtAccept(ParserVisitor visitor, Object data)
63 {
64 return visitor.visit(this, data);
65 }
66
67 /**
68 * @see org.apache.velocity.runtime.parser.node.SimpleNode#evaluate(org.apache.velocity.context.InternalContextAdapter)
69 */
70 public boolean evaluate( InternalContextAdapter context)
71 throws MethodInvocationException
72 {
73 /*
74 * get the two args
75 */
76
77 Object left = jjtGetChild(0).value( context );
78 Object right = jjtGetChild(1).value( context );
79
80 /*
81 * if either is null, lets log and bail
82 */
83
84 if (left == null || right == null)
85 {
86 log.error((left == null ? "Left" : "Right")
87 + " side ("
88 + jjtGetChild( (left == null? 0 : 1) ).literal()
89 + ") of '<=' operation has null value."
90 + " Operation not possible. "
91 + context.getCurrentTemplateName() + " [line "
92 + getLine()
93 + ", column " + getColumn() + "]");
94 return false;
95 }
96
97 /*
98 * convert to Number if applicable
99 */
100 if (left instanceof TemplateNumber)
101 {
102 left = ( (TemplateNumber) left).getAsNumber();
103 }
104 if (right instanceof TemplateNumber)
105 {
106 right = ( (TemplateNumber) right).getAsNumber();
107 }
108
109 /*
110 * Only compare Numbers
111 */
112 if ( !( left instanceof Number ) || !( right instanceof Number ))
113 {
114 log.error((!(left instanceof Number) ? "Left" : "Right")
115 + " side of '>=' operation is not a Number. "
116 + context.getCurrentTemplateName() + " [line " + getLine()
117 + ", column " + getColumn() + "]");
118
119 return false;
120 }
121
122 return MathUtils.compare ( (Number)left,(Number)right) <= 0;
123
124 }
125
126 /**
127 * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
128 */
129 public Object value(InternalContextAdapter context)
130 throws MethodInvocationException
131 {
132 boolean val = evaluate(context);
133
134 return val ? Boolean.TRUE : Boolean.FALSE;
135 }
136
137 }