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 <em>Attribute</em> and denotes that this class
62 * is an Inner class of another.
63 * to the source file of this class.
64 * It is instantiated from the <em>Attribute.readAttribute()</em> method.
65 *
66 * @version $Id: InnerClasses.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 Attribute
69 */
70 public final class InnerClasses extends Attribute {
71 private InnerClass[] inner_classes;
72 private int number_of_classes;
73
74 /***
75 * Initialize from another object. Note that both objects use the same
76 * references (shallow copy). Use clone() for a physical copy.
77 */
78 public InnerClasses(InnerClasses c) {
79 this(c.getNameIndex(), c.getLength(), c.getInnerClasses(),
80 c.getConstantPool());
81 }
82
83 /***
84 * @param name_index Index in constant pool to CONSTANT_Utf8
85 * @param length Content length in bytes
86 * @param inner_classes array of inner classes attributes
87 * @param constant_pool Array of constants
88 * @param sourcefile_index Index in constant pool to CONSTANT_Utf8
89 */
90 public InnerClasses(int name_index, int length,
91 InnerClass[] inner_classes,
92 ConstantPool constant_pool)
93 {
94 super(Constants.ATTR_INNER_CLASSES, name_index, length, constant_pool);
95 setInnerClasses(inner_classes);
96 }
97
98 /***
99 * Construct object from file stream.
100 *
101 * @param name_index Index in constant pool to CONSTANT_Utf8
102 * @param length Content length in bytes
103 * @param file Input stream
104 * @param constant_pool Array of constants
105 * @throws IOException
106 */
107 InnerClasses(int name_index, int length, DataInputStream file,
108 ConstantPool constant_pool) throws IOException
109 {
110 this(name_index, length, (InnerClass[])null, constant_pool);
111
112 number_of_classes = file.readUnsignedShort();
113 inner_classes = new InnerClass[number_of_classes];
114
115 for(int i=0; i < number_of_classes; i++)
116 inner_classes[i] = new InnerClass(file);
117 }
118 /***
119 * Called by objects that are traversing the nodes of the tree implicitely
120 * defined by the contents of a Java class. I.e., the hierarchy of methods,
121 * fields, attributes, etc. spawns a tree of objects.
122 *
123 * @param v Visitor object
124 */
125 public void accept(Visitor v) {
126 v.visitInnerClasses(this);
127 }
128 /***
129 * Dump source file attribute to file stream in binary format.
130 *
131 * @param file Output file stream
132 * @throws IOException
133 */
134 public final void dump(DataOutputStream file) throws IOException
135 {
136 super.dump(file);
137 file.writeShort(number_of_classes);
138
139 for(int i=0; i < number_of_classes; i++)
140 inner_classes[i].dump(file);
141 }
142
143 /***
144 * @return array of inner class "records"
145 */
146 public final InnerClass[] getInnerClasses() { return inner_classes; }
147
148 /***
149 * @param inner_classes.
150 */
151 public final void setInnerClasses(InnerClass[] inner_classes) {
152 this.inner_classes = inner_classes;
153 number_of_classes = (inner_classes == null)? 0 : inner_classes.length;
154 }
155
156 /***
157 * @return String representation.
158 */
159 public final String toString() {
160 StringBuffer buf = new StringBuffer();
161
162 for(int i=0; i < number_of_classes; i++)
163 buf.append(inner_classes[i].toString(constant_pool) + "\n");
164
165 return buf.toString();
166 }
167
168 /***
169 * @return deep copy of this attribute
170 */
171 public Attribute copy(ConstantPool constant_pool) {
172 InnerClasses c = (InnerClasses)clone();
173
174 c.inner_classes = new InnerClass[number_of_classes];
175 for(int i=0; i < number_of_classes; i++)
176 c.inner_classes[i] = inner_classes[i].copy();
177
178 c.constant_pool = constant_pool;
179 return c;
180 }
181 }
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