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Java > Open Source Codes > jbet > CpString


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 constant string record in the constant pool. By
33  * default, the Java compiler represents every string literal using
34  * one of these records, and all references to the same string literal
35  * reference the same constant pool item.
36  *
37  * $Id: CpString.java,v 1.5 2003/09/09 17:31:53 areisse Exp $
38  *
39  * @author Larry D'Anna
40  * @author Lee Badger
41  * @version 0.1
42  * @since JDK 1.1.8
43  */
44 package jbet;
45 import java.io.*;
46
47 class CpString extends CpEntry {
48     int stringIndex = -1; // JVM spec 4.4.3 string_index
49 String JavaDoc str; // the associated string
50
51     // Constructors
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     CpString(int i, CPInterface cp) {
60     super(i, CPInterface.CONSTANT_String, cp);
61     }
62
63
64     /**
65      * Used by ConstantPool.internString(String s)
66      * @see CPInterface.internString
67      *
68      */
69     CpString(CPInterface cp, String JavaDoc s) {
70     super(cp.poolCount(), CPInterface.CONSTANT_String, cp);
71     str = s;
72     }
73
74     String JavaDoc string() { return str; };
75
76     void setup() throws ClassFileException {
77     if (str == null)
78         str = constantPool.cpUtf8At( stringIndex ).string;
79     }
80     
81     public String JavaDoc toString() {
82     return "\"" + Util.quoteString(string()) + "\"" ;
83     }
84
85     public boolean equals (Object JavaDoc o) {
86     return (o instanceof CpString) && ((CpString)o).str.equals(str);
87     }
88
89     public int hashCode () {
90     return str.hashCode() + 2;
91     }
92
93     void write(DataOutputStream dataOut) throws IOException {
94     dataOut.writeByte(tag);
95     dataOut.writeShort(stringIndex);
96     }
97
98 }
99
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