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 long object.
64   *
65   * @version $Id: ConstantLong.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $
66   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67   * @see     Constant
68   */
69  public final class ConstantLong extends Constant implements ConstantObject {
70    private long bytes;
71  
72    /*** 
73     * @param bytes Data
74     */
75    public ConstantLong(long bytes)
76    {
77      super(Constants.CONSTANT_Long);
78      this.bytes = bytes;
79    }    
80    /***
81     * Initialize from another object.
82     */
83    public ConstantLong(ConstantLong c) {
84      this(c.getBytes());
85    }    
86    /*** 
87     * Initialize instance from file data.
88     *
89     * @param file Input stream
90     * @throws IOException
91     */
92    ConstantLong(DataInputStream file) throws IOException
93    {    
94      this(file.readLong());
95    }    
96    /***
97     * Called by objects that are traversing the nodes of the tree implicitely
98     * defined by the contents of a Java class. I.e., the hierarchy of methods,
99     * fields, attributes, etc. spawns a tree of objects.
100    *
101    * @param v Visitor object
102    */
103   public void accept(Visitor v) {
104     v.visitConstantLong(this);
105   }    
106   /***
107    * Dump constant long to file stream in binary format.
108    *
109    * @param file Output file stream
110    * @throws IOException
111    */ 
112   public final void dump(DataOutputStream file) throws IOException
113   {
114     file.writeByte(tag);
115     file.writeLong(bytes);
116   }    
117   /***
118    * @return data, i.e., 8 bytes.
119    */  
120   public final long getBytes() { return bytes; }    
121   /***
122    * @param bytes.
123    */
124   public final void setBytes(long bytes) {
125     this.bytes = bytes;
126   }    
127   /***
128    * @return String representation.
129    */
130   public final String toString() {
131     return super.toString() + "(bytes = " + bytes + ")";
132   }    
133 
134   /*** @return Long object
135    */
136   public Object getConstantValue(ConstantPool cp) {
137     return new Long(bytes);
138   }
139 }
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