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.runtime.parser.Parser;
24 import org.apache.velocity.runtime.parser.ParserVisitor;
25 import org.apache.velocity.exception.MethodInvocationException;
26
27 import org.apache.velocity.util.TemplateNumber;
28
29
30 /**
31 * Handles arg1 >= arg2<br><br>
32 *
33 * Only subclasses of Number can be compared.<br><br>
34 *
35 * Please look at the Parser.jjt file which is
36 * what controls the generation of this class.
37 *
38 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
39 * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
40 */
41 public class ASTGENode extends SimpleNode
42 {
43 /**
44 * @param id
45 */
46 public ASTGENode(int id)
47 {
48 super(id);
49 }
50
51 /**
52 * @param p
53 * @param id
54 */
55 public ASTGENode(Parser p, int id)
56 {
57 super(p, id);
58 }
59
60
61 /**
62 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.ParserVisitor, java.lang.Object)
63 */
64 public Object jjtAccept(ParserVisitor visitor, Object data)
65 {
66 return visitor.visit(this, data);
67 }
68
69 /**
70 * @see org.apache.velocity.runtime.parser.node.SimpleNode#evaluate(org.apache.velocity.context.InternalContextAdapter)
71 */
72 public boolean evaluate( InternalContextAdapter context)
73 throws MethodInvocationException
74 {
75 /*
76 * get the two args
77 */
78
79 Object left = jjtGetChild(0).value( context );
80 Object right = jjtGetChild(1).value( context );
81
82 /*
83 * if either is null, lets log and bail
84 */
85
86 if (left == null || right == null)
87 {
88 log.error((left == null ? "Left" : "Right")
89 + " side ("
90 + jjtGetChild( (left == null? 0 : 1) ).literal()
91 + ") of '>=' operation has null value."
92 + " Operation not possible. "
93 + context.getCurrentTemplateName() + " [line "
94 + getLine()
95 + ", column " + getColumn() + "]");
96 return false;
97 }
98
99
100 /*
101 * convert to Number if applicable
102 */
103 if (left instanceof TemplateNumber)
104 {
105 left = ( (TemplateNumber) left).getAsNumber();
106 }
107 if (right instanceof TemplateNumber)
108 {
109 right = ( (TemplateNumber) right).getAsNumber();
110 }
111
112 /*
113 * Only compare Numbers
114 */
115
116 if ( !( left instanceof Number ) || !( right instanceof Number ))
117 {
118 log.error((!(left instanceof Number) ? "Left" : "Right")
119 + " side of '>=' operation is not a Number. "
120 + context.getCurrentTemplateName() + " [line " + getLine()
121 + ", column " + getColumn() + "]");
122
123 return false;
124 }
125
126 return MathUtils.compare ( (Number)left,(Number)right) >= 0;
127
128 }
129
130 /**
131 * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
132 */
133 public Object value(InternalContextAdapter context)
134 throws MethodInvocationException
135 {
136 boolean val = evaluate(context);
137
138 return val ? Boolean.TRUE : Boolean.FALSE;
139 }
140
141 }