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Java > Open Source Codes > com > go > trove > classfile > ConstantInfo


1 /* ====================================================================
2  * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3  * ====================================================================
4  * The Tea Software License, Version 1.1
5  *
6  * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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9  * modification, are permitted provided that the following conditions
10  * are met:
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12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
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15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
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20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Walt Disney Internet Group (http://opensource.go.com/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28  * not be used to endorse or promote products derived from this
29  * software without prior written permission. For written
30  * permission, please contact opensource@dig.com.
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32  * 5. Products derived from this software may not be called "Tea",
33  * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34  * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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51  */
52
53 package com.go.trove.classfile;
54
55 import java.io.*;
56
57 /******************************************************************************
58  * This class corresponds to the cp_info structure as defined in
59  * section 4.4 of <i>The Java Virtual Machine Specification</i>.
60  * Subclasses should override the default hashCode and equals methods so
61  * that the ConstantPool will only contain one instance of this constant.
62  *
63  * @author Brian S O'Neill
64  * @version
65  * <!--$$Revision:--> 21 <!-- $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
66  */
67 public abstract class ConstantInfo {
68     final static int TAG_UTF8 = 1;
69     final static int TAG_INTEGER = 3;
70     final static int TAG_FLOAT = 4;
71     final static int TAG_LONG = 5;
72     final static int TAG_DOUBLE = 6;
73     final static int TAG_CLASS = 7;
74     final static int TAG_STRING = 8;
75     final static int TAG_FIELD = 9;
76     final static int TAG_METHOD = 10;
77     final static int TAG_INTERFACE_METHOD = 11;
78     final static int TAG_NAME_AND_TYPE = 12;
79
80     // mIndex is manipulated by ConstantPool
81 int mIndex = -1;
82     private int mTag;
83     
84     protected ConstantInfo(int tag) {
85         mTag = tag;
86     }
87
88     /**
89      * The index of this constant in the constant pool. Is -1 if the
90      * index has not yet been resolved. Constant pool indexes are resolved
91      * when the constant pool is written out.
92      */
93     public int getIndex() {
94         return mIndex;
95     }
96
97     boolean hasPriority() {
98         return false;
99     }
100     
101     int getEntryCount() {
102         return 1;
103     }
104
105     public void writeTo(DataOutput dout) throws IOException {
106         dout.writeByte(mTag);
107     }
108 }
109
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