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
57 import org.apache.bcel.Constants;
58 import java.io.*;
59
60 /***
61 * This class is derived from the abstract
62 * <A HREF="org.apache.bcel.classfile.Constant.html">Constant</A> class
63 * and represents a reference to the name and signature
64 * of a field or method.
65 *
66 * @version $Id: ConstantNameAndType.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $
67 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
68 * @see Constant
69 */
70 public final class ConstantNameAndType extends Constant {
71 private int name_index; // Name of field/method
72 private int signature_index; // and its signature.
73
74 /***
75 * Initialize from another object.
76 */
77 public ConstantNameAndType(ConstantNameAndType c) {
78 this(c.getNameIndex(), c.getSignatureIndex());
79 }
80
81 /***
82 * Initialize instance from file data.
83 *
84 * @param file Input stream
85 * @throws IOException
86 */
87 ConstantNameAndType(DataInputStream file) throws IOException
88 {
89 this((int)file.readUnsignedShort(), (int)file.readUnsignedShort());
90 }
91
92 /***
93 * @param name_index Name of field/method
94 * @param signature_index and its signature
95 */
96 public ConstantNameAndType(int name_index,
97 int signature_index)
98 {
99 super(Constants.CONSTANT_NameAndType);
100 this.name_index = name_index;
101 this.signature_index = signature_index;
102 }
103
104 /***
105 * Called by objects that are traversing the nodes of the tree implicitely
106 * defined by the contents of a Java class. I.e., the hierarchy of methods,
107 * fields, attributes, etc. spawns a tree of objects.
108 *
109 * @param v Visitor object
110 */
111 public void accept(Visitor v) {
112 v.visitConstantNameAndType(this);
113 }
114
115 /***
116 * Dump name and signature index to file stream in binary format.
117 *
118 * @param file Output file stream
119 * @throws IOException
120 */
121 public final void dump(DataOutputStream file) throws IOException
122 {
123 file.writeByte(tag);
124 file.writeShort(name_index);
125 file.writeShort(signature_index);
126 }
127
128 /***
129 * @return Name index in constant pool of field/method name.
130 */
131 public final int getNameIndex() { return name_index; }
132
133 /*** @return name
134 */
135 public final String getName(ConstantPool cp) {
136 return cp.constantToString(getNameIndex(), Constants.CONSTANT_Utf8);
137 }
138
139 /***
140 * @return Index in constant pool of field/method signature.
141 */
142 public final int getSignatureIndex() { return signature_index; }
143
144 /*** @return signature
145 */
146 public final String getSignature(ConstantPool cp) {
147 return cp.constantToString(getSignatureIndex(), Constants.CONSTANT_Utf8);
148 }
149
150 /***
151 * @param name_index.
152 */
153 public final void setNameIndex(int name_index) {
154 this.name_index = name_index;
155 }
156
157 /***
158 * @param signature_index.
159 */
160 public final void setSignatureIndex(int signature_index) {
161 this.signature_index = signature_index;
162 }
163
164 /***
165 * @return String representation
166 */
167 public final String toString() {
168 return super.toString() + "(name_index = " + name_index +
169 ", signature_index = " + signature_index + ")";
170 }
171 }
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