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 a Utf8 encoded string.
64   *
65   * @version $Id: ConstantUtf8.java,v 1.3 2002/12/08 16:04:37 mdahm Exp $
66   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67   * @see     Constant
68   */
69  public final class ConstantUtf8 extends Constant {
70    private String bytes;
71    
72    /***
73     * Initialize from another object.
74     */
75    public ConstantUtf8(ConstantUtf8 c) {
76      this(c.getBytes());
77    }    
78    
79    /***
80     * Initialize instance from file data.
81     *
82     * @param file Input stream
83     * @throws IOException
84     */
85    ConstantUtf8(DataInputStream file) throws IOException
86    {    
87      super(Constants.CONSTANT_Utf8);
88  
89      bytes = file.readUTF();
90    }    
91  
92    /***
93     * @param bytes Data
94     */
95    public ConstantUtf8(String bytes)
96    {
97      super(Constants.CONSTANT_Utf8);
98  
99      if(bytes == null)
100       throw new IllegalArgumentException("bytes must not be null!");
101 
102     this.bytes  = bytes;
103   }    
104 
105   /***
106    * Called by objects that are traversing the nodes of the tree implicitely
107    * defined by the contents of a Java class. I.e., the hierarchy of methods,
108    * fields, attributes, etc. spawns a tree of objects.
109    *
110    * @param v Visitor object
111    */
112   public void accept(Visitor v) {
113     v.visitConstantUtf8(this);
114   }
115 
116   /***
117    * Dump String in Utf8 format to file stream.
118    *
119    * @param file Output file stream
120    * @throws IOException
121    */ 
122   public final void dump(DataOutputStream file) throws IOException
123   {
124     file.writeByte(tag);
125     file.writeUTF(bytes);
126   }
127 
128   /***
129    * @return Data converted to string.
130    */  
131   public final String getBytes() { return bytes; }    
132 
133   /***
134    * @param bytes.
135    */
136   public final void setBytes(String bytes) {
137     this.bytes = bytes;
138   }    
139 
140   /***
141    * @return String representation
142    */
143   public final String toString()
144   {
145     return super.toString() + "(\"" + Utility.replace(bytes, "\n", "//n") + "\")";
146   }    
147 }
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