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Java > Open Source Codes > com > sun > org > apache > bcel > internal > classfile > Synthetic


1 package com.sun.org.apache.bcel.internal.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 com.sun.org.apache.bcel.internal.Constants;
58 import java.io.*;
59
60 /**
61  * This class is derived from <em>Attribute</em> and declares this class
62  * as `synthetic', i.e., it needs special handling.
63  * It is instantiated from the <em>Attribute.readAttribute()</em> method.
64  *
65  * @version $Id: Synthetic.java,v 1.1.1.1 2001/10/29 20:00:03 jvanzyl Exp $
66  * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67  * @see Attribute
68  */
69 public final class Synthetic extends Attribute {
70   private byte[] bytes;
71
72   /**
73    * Initialize from another object. Note that both objects use the same
74    * references (shallow copy). Use copy() for a physical copy.
75    */
76   public Synthetic(Synthetic c) {
77     this(c.getNameIndex(), c.getLength(), c.getBytes(), c.getConstantPool());
78   }
79
80   /**
81    * @param name_index Index in constant pool to CONSTANT_Utf8
82    * @param length Content length in bytes
83    * @param bytes Attribute contents
84    * @param constant_pool Array of constants
85    * @param sourcefile_index Index in constant pool to CONSTANT_Utf8
86    */
87   public Synthetic(int name_index, int length, byte[] bytes,
88            ConstantPool constant_pool)
89   {
90     super(Constants.ATTR_SYNTHETIC, name_index, length, constant_pool);
91     this.bytes = bytes;
92   }
93
94   /**
95    * Construct object from file stream.
96    * @param name_index Index in constant pool to CONSTANT_Utf8
97    * @param length Content length in bytes
98    * @param file Input stream
99    * @param constant_pool Array of constants
100    * @throw IOException
101    */
102   Synthetic(int name_index, int length, DataInputStream file,
103         ConstantPool constant_pool) throws IOException
104   {
105     this(name_index, length, (byte [])null, constant_pool);
106
107     if(length > 0) {
108       bytes = new byte[length];
109       file.readFully(bytes);
110       System.err.println("Synthetic attribute with length > 0");
111     }
112   }
113   /**
114    * Called by objects that are traversing the nodes of the tree implicitely
115    * defined by the contents of a Java class. I.e., the hierarchy of methods,
116    * fields, attributes, etc. spawns a tree of objects.
117    *
118    * @param v Visitor object
119    */
120   public void accept(Visitor v) {
121     v.visitSynthetic(this);
122   }
123   /**
124    * Dump source file attribute to file stream in binary format.
125    *
126    * @param file Output file stream
127    * @throw IOException
128    */
129   public final void dump(DataOutputStream file) throws IOException
130   {
131     super.dump(file);
132     if(length > 0)
133       file.write(bytes, 0, length);
134   }
135   /**
136    * @return data bytes.
137    */
138   public final byte[] getBytes() { return bytes; }
139
140   /**
141    * @param bytes.
142    */
143   public final void setBytes(byte[] bytes) {
144     this.bytes = bytes;
145   }
146
147   /**
148    * @return String representation.
149    */
150   public final String JavaDoc toString() {
151     StringBuffer JavaDoc buf = new StringBuffer JavaDoc("Synthetic");
152
153     if(length > 0)
154       buf.append(" " + Utility.toHexString(bytes));
155
156     return buf.toString();
157   }
158
159   /**
160    * @return deep copy of this attribute
161    */
162   public Attribute copy(ConstantPool constant_pool) {
163     Synthetic c = (Synthetic)clone();
164
165     if(bytes != null)
166       c.bytes = (byte[])bytes.clone();
167
168     c.constant_pool = constant_pool;
169     return c;
170   }
171 }
172
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