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Java > Open Source Codes > jbet > CpEntry


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 record in the constant pool. The ConstantPool object
33  * manages (i.e., contains) a number of record types: CpClass,
34  * CpFieldRef, CpMethodRef, CpString, CpInteger, CpFloat, CpLong,
35  * CpDouble, CpNameAndType, and CpUtf8. All the record types inherit
36  * from CpEntry.
37  *
38  * Note: the class file format defines a record, the
39  * InterfaceMethodRef, which could be represented using a separate
40  * class. We use the CpMethodRef to represent both references to
41  * methods and to interfaces, since this is easier to manipulate.
42  *
43  * $Id: CpEntry.java,v 1.7 2003/09/09 17:31:53 areisse Exp $
44  *
45  * @author Larry D'Anna
46  * @author Lee Badger
47  * @version 0.1
48  * @since JDK 1.1.8
49  */
50
51
52 package jbet;
53 import java.io.*;
54
55 // This is basically a pure-virtual class. Cp<type>.java contain the actual
56 // implimentations.
57 class CpEntry {
58     CPInterface constantPool;
59     int index; // Index of this record in the ConstantPool object.
60 int tag; // CPInterface.CONSTANT_Class, CONSTANT_Integer, ...
61
62     /** Base class constructor.
63      * @param i index in the constant pool
64      * @param t tag defining type
65      * @param cp constant pool
66      */
67     CpEntry (int i, int t, CPInterface cp) {
68     index = i;
69     tag = t;
70     constantPool = cp;
71     }
72
73     /** Base class setup.
74      * Shd be public, called from ConstantPool().
75      */
76     void setup() throws ClassFileException {}
77     
78     /** Return a usable string. Uses the toString for each subtype.
79      * @return the interface mnemonic and the string value
80      */
81     String JavaDoc recString() {
82     return CPInterface.mnemonic[tag] + " " + toString();
83     }
84
85     /** base class write. Overriden by subtypes.
86      * @param dataOut output stream
87      */
88     void write(DataOutputStream dataOut) throws IOException {
89     }
90 }
91
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