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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