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Java > Open Source Codes > org > apache > bcel > classfile > ConstantUtf8


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.classfile;
18
19 import java.io.DataInputStream JavaDoc;
20 import java.io.DataOutputStream JavaDoc;
21 import java.io.IOException JavaDoc;
22 import org.apache.bcel.Constants;
23
24 /**
25  * This class is derived from the abstract
26  * <A HREF="org.apache.bcel.classfile.Constant.html">Constant</A> class
27  * and represents a reference to a Utf8 encoded string.
28  *
29  * @version $Id: ConstantUtf8.java 386056 2006-03-15 11:31:56Z tcurdt $
30  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
31  * @see Constant
32  */
33 public final class ConstantUtf8 extends Constant {
34
35     private String JavaDoc bytes;
36
37
38     /**
39      * Initialize from another object.
40      */
41     public ConstantUtf8(ConstantUtf8 c) {
42         this(c.getBytes());
43     }
44
45
46     /**
47      * Initialize instance from file data.
48      *
49      * @param file Input stream
50      * @throws IOException
51      */
52     ConstantUtf8(DataInputStream JavaDoc file) throws IOException JavaDoc {
53         super(Constants.CONSTANT_Utf8);
54         bytes = file.readUTF();
55     }
56
57
58     /**
59      * @param bytes Data
60      */
61     public ConstantUtf8(String JavaDoc bytes) {
62         super(Constants.CONSTANT_Utf8);
63         if (bytes == null) {
64             throw new IllegalArgumentException JavaDoc("bytes must not be null!");
65         }
66         this.bytes = bytes;
67     }
68
69
70     /**
71      * Called by objects that are traversing the nodes of the tree implicitely
72      * defined by the contents of a Java class. I.e., the hierarchy of methods,
73      * fields, attributes, etc. spawns a tree of objects.
74      *
75      * @param v Visitor object
76      */
77     public void accept( Visitor v ) {
78         v.visitConstantUtf8(this);
79     }
80
81
82     /**
83      * Dump String in Utf8 format to file stream.
84      *
85      * @param file Output file stream
86      * @throws IOException
87      */
88     public final void dump( DataOutputStream JavaDoc file ) throws IOException JavaDoc {
89         file.writeByte(tag);
90         file.writeUTF(bytes);
91     }
92
93
94     /**
95      * @return Data converted to string.
96      */
97     public final String JavaDoc getBytes() {
98         return bytes;
99     }
100
101
102     /**
103      * @param bytes the raw bytes of this Utf-8
104      */
105     public final void setBytes( String JavaDoc bytes ) {
106         this.bytes = bytes;
107     }
108
109
110     /**
111      * @return String representation
112      */
113     public final String JavaDoc toString() {
114         return super.toString() + "(\"" + Utility.replace(bytes, "\n", "\\n") + "\")";
115     }
116 }
117
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