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.exception.VelocityException;
25 import org.apache.velocity.runtime.RuntimeConstants;
26 import org.apache.velocity.runtime.log.Log;
27 import org.apache.velocity.runtime.parser.Parser;
28 import org.apache.velocity.util.TemplateNumber;
29
30
31 /**
32 * Handles arg1 >= arg2<br><br>
33 *
34 * Only subclasses of Number can be compared.<br><br>
35 *
36 * Please look at the Parser.jjt file which is
37 * what controls the generation of this class.
38 *
39 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
40 * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
41 */
42 public class ASTGENode extends SimpleNode
43 {
44 /**
45 * @param id
46 */
47 public ASTGENode(int id)
48 {
49 super(id);
50 }
51
52 /**
53 * @param p
54 * @param id
55 */
56 public ASTGENode(Parser p, int id)
57 {
58 super(p, id);
59 }
60
61
62 /**
63 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
64 */
65 public Object jjtAccept(ParserVisitor visitor, Object data)
66 {
67 return visitor.visit(this, data);
68 }
69
70 /**
71 * @see org.apache.velocity.runtime.parser.node.SimpleNode#evaluate(org.apache.velocity.context.InternalContextAdapter)
72 */
73 public boolean evaluate( InternalContextAdapter context)
74 throws MethodInvocationException
75 {
76 /*
77 * get the two args
78 */
79
80 Object left = jjtGetChild(0).value( context );
81 Object right = jjtGetChild(1).value( context );
82
83 /*
84 * if either is null, lets log and bail
85 */
86
87 if (left == null || right == null)
88 {
89 String msg = (left == null ? "Left" : "Right")
90 + " side ("
91 + jjtGetChild( (left == null? 0 : 1) ).literal()
92 + ") of '>=' operation has null value at "
93 + Log.formatFileString(this);
94
95 if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
96 {
97 throw new VelocityException(msg);
98 }
99
100 log.error(msg);
101 return false;
102 }
103
104
105 /*
106 * convert to Number if applicable
107 */
108 if (left instanceof TemplateNumber)
109 {
110 left = ( (TemplateNumber) left).getAsNumber();
111 }
112 if (right instanceof TemplateNumber)
113 {
114 right = ( (TemplateNumber) right).getAsNumber();
115 }
116
117 /*
118 * Only compare Numbers
119 */
120
121 if ( !( left instanceof Number ) || !( right instanceof Number ))
122 {
123 String msg = (!(left instanceof Number) ? "Left" : "Right")
124 + " side of '>=' operation is not a Number at "
125 + Log.formatFileString(this);
126
127 if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
128 {
129 throw new VelocityException(msg);
130 }
131
132 log.error(msg);
133 return false;
134 }
135
136 return MathUtils.compare ( (Number)left,(Number)right) >= 0;
137
138 }
139
140 /**
141 * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
142 */
143 public Object value(InternalContextAdapter context)
144 throws MethodInvocationException
145 {
146 boolean val = evaluate(context);
147
148 return val ? Boolean.TRUE : Boolean.FALSE;
149 }
150
151 }