1 package org.apache.bcel.classfile;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache BCEL" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache BCEL", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56 import java.io.*;
57 import org.apache.bcel.Constants;
58
59 /***
60 * Abstract super class for Fieldref and Methodref constants.
61 *
62 * @version $Id: ConstantCP.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $
63 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
64 * @see ConstantFieldref
65 * @see ConstantMethodref
66 * @see ConstantInterfaceMethodref
67 */
68 public abstract class ConstantCP extends Constant {
69 /*** References to the constants containing the class and the field signature
70 */
71 protected int class_index, name_and_type_index;
72
73 /***
74 * Initialize from another object.
75 */
76 public ConstantCP(ConstantCP c) {
77 this(c.getTag(), c.getClassIndex(), c.getNameAndTypeIndex());
78 }
79
80 /***
81 * Initialize instance from file data.
82 *
83 * @param tag Constant type tag
84 * @param file Input stream
85 * @throws IOException
86 */
87 ConstantCP(byte tag, DataInputStream file) throws IOException
88 {
89 this(tag, file.readUnsignedShort(), file.readUnsignedShort());
90 }
91
92 /***
93 * @param class_index Reference to the class containing the field
94 * @param name_and_type_index and the field signature
95 */
96 protected ConstantCP(byte tag, int class_index,
97 int name_and_type_index) {
98 super(tag);
99 this.class_index = class_index;
100 this.name_and_type_index = name_and_type_index;
101 }
102
103 /***
104 * Dump constant field reference to file stream in binary format.
105 *
106 * @param file Output file stream
107 * @throws IOException
108 */
109 public final void dump(DataOutputStream file) throws IOException
110 {
111 file.writeByte(tag);
112 file.writeShort(class_index);
113 file.writeShort(name_and_type_index);
114 }
115
116 /***
117 * @return Reference (index) to class this field or method belongs to.
118 */
119 public final int getClassIndex() { return class_index; }
120
121 /***
122 * @return Reference (index) to signature of the field.
123 */
124 public final int getNameAndTypeIndex() { return name_and_type_index; }
125
126 /***
127 * @param class_index points to Constant_class
128 */
129 public final void setClassIndex(int class_index) {
130 this.class_index = class_index;
131 }
132
133 /***
134 * @return Class this field belongs to.
135 */
136 public String getClass(ConstantPool cp) {
137 return cp.constantToString(class_index, Constants.CONSTANT_Class);
138 }
139
140 /***
141 * @param name_and_type_index points to Constant_NameAndType
142 */
143 public final void setNameAndTypeIndex(int name_and_type_index) {
144 this.name_and_type_index = name_and_type_index;
145 }
146
147 /***
148 * @return String representation.
149 */
150 public final String toString() {
151 return super.toString() + "(class_index = " + class_index +
152 ", name_and_type_index = " + name_and_type_index + ")";
153 }
154 }
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