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Java > Open Source Codes > classycle > classfile > NameAndTypeConstant


1 /*
2  * Copyright (c) 2003-2006, Franz-Josef Elmer, All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * - Redistributions of source code must retain the above copyright notice,
8  * this list of conditions and the following disclaimer.
9  * - Redistributions in binary form must reproduce the above copyright notice,
10  * this list of conditions and the following disclaimer in the documentation
11  * and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
15  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
23  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 package classycle.classfile;
26
27 /**
28  * Constant holding a name and a type or method descriptor.
29  *
30  * @author Franz-Josef Elmer
31  */
32 public class NameAndTypeConstant extends Constant {
33   private final int _nameIndex;
34   private final int _descriptorIndex;
35
36   /**
37    * Creates an instance for the specified name and type or method descriptor.
38    * @param pool Constant pool. Needed to resolve references.
39    * @param nameIndex Index of the name in the pool.
40    * @param descriptorIndex Index of the type or method descriptor in the pool.
41    */
42   public NameAndTypeConstant(Constant[] pool, int nameIndex,
43                              int descriptorIndex) {
44     super(pool);
45     _nameIndex = nameIndex;
46     _descriptorIndex = descriptorIndex;
47   }
48
49   /** Returns the name. */
50   public String JavaDoc getName() {
51     String JavaDoc result = null;
52     Constant c = getConstant(_nameIndex);
53     if (c instanceof UTF8Constant) {
54       result = ((UTF8Constant) c).getString();
55     }
56     return result;
57   }
58
59   /** Returns the type or method descriptor. */
60   public String JavaDoc getDescriptor() {
61     String JavaDoc result = null;
62     Constant c = getConstant(_descriptorIndex);
63     if (c instanceof UTF8Constant) {
64       result = ((UTF8Constant) c).getString();
65     }
66     return result;
67   }
68
69   /** Returns constant type, name, and descriptor. */
70   public String JavaDoc toString() {
71     return "CONSTANT_NameAndType: " + getName() + ", " + getDescriptor();
72   }
73 } //class
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