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Java > Open Source Codes > jbet > CpLong


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 a long constant record in the constant pool. Long
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 criterion would be to conserve
36  * space and store in the constant pool values that recur. Long
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 Long consumes two constant pool slots.
41  *
42  * @author Larry D'Anna
43  * @author Lee Badger
44  * @version 0.1
45  * @since JDK 1.1.8
46  */
47 package jbet;
48 import java.io.*;
49
50 class CpLong extends CpEntry {
51     long value;
52
53     /** Constructor.
54      * @param i index in pool
55      * @param cp constant pool
56      */
57     CpLong(int i, CPInterface cp) {
58     super(i, CPInterface.CONSTANT_Long, cp);
59     }
60
61     /** Constructor.
62      * @param cp constant pool
63      * @param l long value
64      */
65     CpLong(CPInterface cp, long l) {
66     super(cp.poolCount(), CPInterface.CONSTANT_Long, cp);
67     value = l;
68     }
69
70     /** Override toString for printable version.
71      * @return printable value
72      */
73     public String JavaDoc toString() {
74     return String.valueOf(value);
75     }
76
77     /** Override hashCode
78      * @return hashcode
79      */
80     public int hashCode() {
81     return 17 * (int)value;
82     }
83
84     /** Override equals, compare numeric value.
85      * @param o Object to compare to this
86      * @return true if types match and equal value
87      */
88     public boolean equals(Object JavaDoc o) {
89     return (o instanceof CpLong) && ((CpLong)o).value == value;
90     }
91
92     /** Override write. Write out tag and value.
93      * @param dataOut output stream
94      */
95     void write(DataOutputStream dataOut) throws IOException {
96     dataOut.writeByte(tag);
97     dataOut.writeLong(value);
98     }
99 }
100
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