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Java > Open Source Codes > classycle > classfile > RefConstant


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  * Abstract supper class of all reference constants.
29  *
30  * @author Franz-Josef Elmer
31  */
32 public abstract class RefConstant extends Constant {
33   private final int _classIndex;
34   private final int _nameAndTypeIndex;
35
36   /**
37    * Creates an instance for the specified class, name, and type.
38    * @param pool Constant pool. Needed for resolving references.
39    * @param classIndex Index of {@link ClassConstant}.
40    * @param nameAndTypeIndex Index of {@link NameAndTypeConstant}.
41    */
42   public RefConstant(Constant[] pool, int classIndex, int nameAndTypeIndex) {
43     super(pool);
44     _classIndex = classIndex;
45     _nameAndTypeIndex = nameAndTypeIndex;
46   }
47
48   /** Returns the class constant. */
49   public ClassConstant getClassConstant() {
50     return (ClassConstant) getConstant(_classIndex);
51   }
52
53   /** Returns the name-and-type constant. */
54   public NameAndTypeConstant getNameAndType() {
55     return (NameAndTypeConstant) getConstant(_nameAndTypeIndex);
56   }
57
58   /** Pretty printing. Will be used by <tt>toString</tt> of the subclasses. */
59   protected String JavaDoc toString(String JavaDoc constantType) {
60     return constantType + ": Class = " + getClassConstant().getName()
61                         + ", Name = " + getNameAndType().getName()
62                         + ", Descriptor = " + getNameAndType().getDescriptor();
63   }
64 } //class
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