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Java > Open Source Codes > com > caucho > bytecode > ConstantPoolEntry


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.bytecode;
30
31 import com.caucho.log.Log;
32
33 import java.io.IOException JavaDoc;
34 import java.util.logging.Logger JavaDoc;
35
36 /**
37  * Represents a constant pool entry.
38  */
39 abstract public class ConstantPoolEntry {
40   static private final Logger JavaDoc log = Log.open(ConstantPoolEntry.class);
41
42   private ConstantPool _pool;
43   private int _index;
44
45   ConstantPoolEntry(ConstantPool pool, int index)
46   {
47     _pool = pool;
48     _index = index;
49   }
50
51   /**
52    * Returns the constant pool.
53    */
54   public ConstantPool getConstantPool()
55   {
56     return _pool;
57   }
58
59   /**
60    * Returns the index.
61    */
62   public int getIndex()
63   {
64     return _index;
65   }
66
67   /**
68    * Writes the contents of the pool.
69    */
70   abstract void write(ByteCodeWriter out)
71     throws IOException JavaDoc;
72
73   /**
74    * Exports to the target pool.
75    *
76    * @return the index in the target pool.
77    */
78   abstract int export(ConstantPool target);
79 }
80
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