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Java > Open Source Codes > javassist > bytecode > annotation > DoubleMemberValue


1 /*
2  * Javassist, a Java-bytecode translator toolkit.
3  * Copyright (C) 2004 Bill Burke. All Rights Reserved.
4  *
5  * The contents of this file are subject to the Mozilla Public License Version
6  * 1.1 (the "License"); you may not use this file except in compliance with
7  * the License. Alternatively, the contents of this file may be used under
8  * the terms of the GNU Lesser General Public License Version 2.1 or later.
9  *
10  * Software distributed under the License is distributed on an "AS IS" basis,
11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12  * for the specific language governing rights and limitations under the
13  * License.
14  */
15
16 package javassist.bytecode.annotation;
17
18 import javassist.bytecode.ConstPool;
19 import java.io.IOException JavaDoc;
20
21 /**
22  * Double floating-point number constant value.
23  *
24  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
25  * @author Shigeru Chiba
26  * @version $Revision: 1.4 $
27  */
28 public class DoubleMemberValue extends MemberValue {
29     int valueIndex;
30
31     /**
32      * Constructs a double constant value. The initial value is specified
33      * by the constant pool entry at the given index.
34      *
35      * @param index the index of a CONSTANT_Double_info structure.
36      */
37     public DoubleMemberValue(int index, ConstPool cp) {
38         super('D', cp);
39         this.valueIndex = index;
40     }
41
42     /**
43      * Constructs a double constant value.
44      *
45      * @param d the initial value.
46      */
47     public DoubleMemberValue(double d, ConstPool cp) {
48         super('D', cp);
49         setValue(d);
50     }
51
52     /**
53      * Constructs a double constant value. The initial value is 0.0.
54      */
55     public DoubleMemberValue(ConstPool cp) {
56         super('D', cp);
57         setValue(0.0);
58     }
59
60     /**
61      * Obtains the value of the member.
62      */
63     public double getValue() {
64         return cp.getDoubleInfo(valueIndex);
65     }
66
67     /**
68      * Sets the value of the member.
69      */
70     public void setValue(double newValue) {
71         valueIndex = cp.addDoubleInfo(newValue);
72     }
73
74     /**
75      * Obtains the string representation of this object.
76      */
77     public String JavaDoc toString() {
78         return Double.toString(getValue());
79     }
80
81     void write(AnnotationsWriter writer) throws IOException JavaDoc {
82         writer.constValueIndex(getValue());
83     }
84
85     /**
86      * Accepts a visitor.
87      */
88     public void accept(MemberValueVisitor visitor) {
89         visitor.visitDoubleMemberValue(this);
90     }
91 }
92
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