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


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 string pointer in the constant pool.
38  */
39 public class StringConstant extends ConstantPoolEntry {
40   static private final Logger JavaDoc log = Log.open(StringConstant.class);
41
42   private int _stringIndex;
43
44   /**
45    * Creates a new string constant.
46    */
47   StringConstant(ConstantPool pool, int index, int stringIndex)
48   {
49     super(pool, index);
50
51     _stringIndex = stringIndex;
52   }
53
54   /**
55    * Returns the UTF string.
56    */
57   public String JavaDoc getString()
58   {
59     return getConstantPool().getUtf8(_stringIndex).getValue();
60   }
61
62   /**
63    * Writes the contents of the pool entry.
64    */
65   void write(ByteCodeWriter out)
66     throws IOException JavaDoc
67   {
68     out.write(ConstantPool.CP_STRING);
69     out.writeShort(_stringIndex);
70   }
71
72   /**
73    * Exports to the target pool.
74    */
75   public int export(ConstantPool target)
76   {
77     return target.addString(getString()).getIndex();
78   }
79
80   public String JavaDoc toString()
81   {
82     return "StringConstant[" + getString() + "]";
83   }
84 }
85
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