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Java > Open Source Codes > jbet > CpDouble


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 /**
32  * Represent an double constant record in the constant pool. Double
33  * constants can be represented either as inline data with the
34  * instructions, or using records in the constant pool. The decision
35  * can be arbitrary, but a rational criteria would be to conserve
36  * space and store in the constant pool values that recur. Double
37  * constants that are stored in the constant pool are unique (i.e.,
38  * all code that uses the same value refers to the same record).
39  *
40  * Note: a Double consumes two constant pool slots.
41  *
42  * $Id: CpDouble.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  */

48 package jbet;
49 import java.io.*;
50
51 class CpDouble extends CpEntry {
52     double value;
53     CpDouble(int i, CPInterface cp) {
54     super(i, CPInterface.CONSTANT_Double, cp);
55     }
56
57     CpDouble(CPInterface cp, double d) {
58     super(cp.poolCount(), CPInterface.CONSTANT_Double, cp);
59     value = d;
60     }
61
62
63     public String JavaDoc toString() {
64     return String.valueOf(value);
65     }
66
67     public int hashCode() {
68     return 17 * (int)value;
69     }
70
71     public boolean equals(Object JavaDoc o) {
72     return (o instanceof CpDouble) && ((CpDouble)o).value == value;
73     }
74
75     void write(DataOutputStream dataOut) throws IOException {
76     dataOut.writeByte(tag);
77     dataOut.writeDouble(value);
78     }
79 }
80
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