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


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 long object.
28  *
29  * @version $Id: ConstantLong.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 ConstantLong extends Constant implements ConstantObject {
34
35     private long bytes;
36
37
38     /**
39      * @param bytes Data
40      */
41     public ConstantLong(long bytes) {
42         super(Constants.CONSTANT_Long);
43         this.bytes = bytes;
44     }
45
46
47     /**
48      * Initialize from another object.
49      */
50     public ConstantLong(ConstantLong c) {
51         this(c.getBytes());
52     }
53
54
55     /**
56      * Initialize instance from file data.
57      *
58      * @param file Input stream
59      * @throws IOException
60      */
61     ConstantLong(DataInputStream JavaDoc file) throws IOException JavaDoc {
62         this(file.readLong());
63     }
64
65
66     /**
67      * Called by objects that are traversing the nodes of the tree implicitely
68      * defined by the contents of a Java class. I.e., the hierarchy of methods,
69      * fields, attributes, etc. spawns a tree of objects.
70      *
71      * @param v Visitor object
72      */
73     public void accept( Visitor v ) {
74         v.visitConstantLong(this);
75     }
76
77
78     /**
79      * Dump constant long to file stream in binary format.
80      *
81      * @param file Output file stream
82      * @throws IOException
83      */
84     public final void dump( DataOutputStream JavaDoc file ) throws IOException JavaDoc {
85         file.writeByte(tag);
86         file.writeLong(bytes);
87     }
88
89
90     /**
91      * @return data, i.e., 8 bytes.
92      */
93     public final long getBytes() {
94         return bytes;
95     }
96
97
98     /**
99      * @param bytes thr raw bytes that represent this long
100      */
101     public final void setBytes( long bytes ) {
102         this.bytes = bytes;
103     }
104
105
106     /**
107      * @return String representation.
108      */
109     public final String JavaDoc toString() {
110         return super.toString() + "(bytes = " + bytes + ")";
111     }
112
113
114     /** @return Long object
115      */
116     public Object JavaDoc getConstantValue( ConstantPool cp ) {
117         return new Long JavaDoc(bytes);
118     }
119 }
120
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