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 java.math.BigDecimal;
23
24 import org.apache.velocity.context.InternalContextAdapter;
25 import org.apache.velocity.exception.TemplateInitException;
26 import org.apache.velocity.runtime.parser.Parser;
27 import org.apache.velocity.runtime.parser.ParserVisitor;
28
29
30 /**
31 * Handles floating point numbers. The value will be either a Double
32 * or a BigDecimal.
33 *
34 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
35 */
36 public class ASTFloatingPointLiteral extends SimpleNode
37 {
38
39 // This may be of type Double or BigDecimal
40 private Number value = null;
41
42 /**
43 * @param id
44 */
45 public ASTFloatingPointLiteral(int id)
46 {
47 super(id);
48 }
49
50 /**
51 * @param p
52 * @param id
53 */
54 public ASTFloatingPointLiteral(Parser p, int id)
55 {
56 super(p, id);
57 }
58
59
60 /**
61 * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.ParserVisitor, java.lang.Object)
62 */
63 public Object jjtAccept(ParserVisitor visitor, Object data)
64 {
65 return visitor.visit(this, data);
66 }
67
68 /**
69 * Initialization method - doesn't do much but do the object
70 * creation. We only need to do it once.
71 * @param context
72 * @param data
73 * @return The data object.
74 * @throws TemplateInitException
75 */
76 public Object init( InternalContextAdapter context, Object data)
77 throws TemplateInitException
78 {
79 /*
80 * init the tree correctly
81 */
82
83 super.init( context, data );
84
85 /**
86 * Determine the size of the item and make it a Double or BigDecimal as appropriate.
87 */
88 String str = getFirstToken().image;
89 try
90 {
91 value = new Double( str );
92
93 } catch ( NumberFormatException E1 )
94 {
95
96 // if there's still an Exception it will propogate out
97 value = new BigDecimal( str );
98
99 }
100
101 return data;
102 }
103
104 /**
105 * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
106 */
107 public Object value( InternalContextAdapter context)
108 {
109 return value;
110 }
111
112
113 }