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 * 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
42 public class ASTLENode extends SimpleNode
43 {
44 /**
45 * @param id
46 */
47 public ASTLENode(int id)
48 {
49 super(id);
50 }
51
52 /**
53 * @param p
54 * @param id
55 */
56 public ASTLENode(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 * convert to Number if applicable
106 */
107 if (left instanceof TemplateNumber)
108 {
109 left = ( (TemplateNumber) left).getAsNumber();
110 }
111 if (right instanceof TemplateNumber)
112 {
113 right = ( (TemplateNumber) right).getAsNumber();
114 }
115
116 /*
117 * Only compare Numbers
118 */
119 if ( !( left instanceof Number ) || !( right instanceof Number ))
120 {
121 String msg = (!(left instanceof Number) ? "Left" : "Right")
122 + " side of '>=' operation is not a Number at "
123 + Log.formatFileString(this);
124
125 if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
126 {
127 throw new VelocityException(msg);
128 }
129
130 log.error(msg);
131 return false;
132 }
133
134 return MathUtils.compare ( (Number)left,(Number)right) <= 0;
135
136 }
137
138 /**
139 * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
140 */
141 public Object value(InternalContextAdapter context)
142 throws MethodInvocationException
143 {
144 boolean val = evaluate(context);
145
146 return val ? Boolean.TRUE : Boolean.FALSE;
147 }
148
149 }