01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
34: import java.util.logging.Logger;
35:
36: /**
37: * Represents a constant pool entry.
38: */
39: abstract public class ConstantPoolEntry {
40: static private final Logger log = Log.open(ConstantPoolEntry.class);
41:
42: private ConstantPool _pool;
43: private int _index;
44:
45: ConstantPoolEntry(ConstantPool pool, int index) {
46: _pool = pool;
47: _index = index;
48: }
49:
50: /**
51: * Returns the constant pool.
52: */
53: public ConstantPool getConstantPool() {
54: return _pool;
55: }
56:
57: /**
58: * Returns the index.
59: */
60: public int getIndex() {
61: return _index;
62: }
63:
64: /**
65: * Writes the contents of the pool.
66: */
67: abstract void write(ByteCodeWriter out) throws IOException;
68:
69: /**
70: * Exports to the target pool.
71: *
72: * @return the index in the target pool.
73: */
74: abstract int export(ConstantPool target);
75: }
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