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Java > Open Source Codes > jbet > CpFloat


1 /*
2  * JBET - Java Binary Enhancement Tool
3  * Copyright (c) 2003 Networks Associates Technology, Inc.
4  *
5  * This software was developed under DARPA/SPAWAR contract
6  * N66001-00-C-8602 "SPMA" as part of the
7  * DARPA OASIS research program.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in the
16  * documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30
31 package jbet;
32 import java.io.*;
33 /**
34  * Represent an float constant record in the constant pool. Float
35  * constants can be represented either as inline data with the
36  * instructions, or using records in the constant pool. The decision
37  * can be arbitrary, but a rational criteria would be to conserve
38  * space and store in the constant pool values that recur. Float
39  * constants that are stored in the constant pool are unique (i.e.,
40  * all code that uses the same value refers to the same record).
41  *
42  * $Id: CpFloat.java,v 1.4 2003/09/09 17:31:53 areisse Exp $
43  *
44  * @author Larry D'Anna
45  * @author Lee Badger
46  * @version 0.1
47  * @since JDK 1.1.8
48  */
49
50 class CpFloat extends CpEntry {
51     float value;
52
53     /**
54      * Used by ConstantPool.ConstantPool(DataInputStream dataIn)...
55      * during Pass 1.
56      *
57      * @param i index into the our representation of the constant pool
58      */
59     CpFloat(int i, CPInterface cp) {
60     super(i, CPInterface.CONSTANT_Float, cp);
61     }
62
63     /**
64      * Used by ConstantPool.internFloat(float i)
65      * @see CPInterface.internFloat
66      *
67      */
68     CpFloat(CPInterface cp, float f) {
69     super(cp.poolCount(), CPInterface.CONSTANT_Float, cp);
70     value = f;
71     
72     }
73
74     public String JavaDoc toString() {
75     return String.valueOf(value);
76     }
77
78     public int hashCode() {
79     return 17 * (int) value;
80     }
81
82     public boolean equals(Object JavaDoc o) {
83     return (o instanceof CpFloat) && ((CpFloat)o).value == value;
84     }
85
86     void write(DataOutputStream dataOut) throws IOException {
87     dataOut.writeByte(tag);
88     dataOut.writeFloat(value);
89     }
90
91 }
92
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