1   
2   package org.apache.bcel.classfile;
3   
4   /* ====================================================================
5    * The Apache Software License, Version 1.1
6    *
7    * Copyright (c) 2001 The Apache Software Foundation.  All rights
8    * reserved.
9    *
10   * Redistribution and use in source and binary forms, with or without
11   * modification, are permitted provided that the following conditions
12   * are met:
13   *
14   * 1. Redistributions of source code must retain the above copyright
15   *    notice, this list of conditions and the following disclaimer.
16   *
17   * 2. Redistributions in binary form must reproduce the above copyright
18   *    notice, this list of conditions and the following disclaimer in
19   *    the documentation and/or other materials provided with the
20   *    distribution.
21   *
22   * 3. The end-user documentation included with the redistribution,
23   *    if any, must include the following acknowledgment:
24   *       "This product includes software developed by the
25   *        Apache Software Foundation (http://www.apache.org/)."
26   *    Alternately, this acknowledgment may appear in the software itself,
27   *    if and wherever such third-party acknowledgments normally appear.
28   *
29   * 4. The names "Apache" and "Apache Software Foundation" and
30   *    "Apache BCEL" must not be used to endorse or promote products
31   *    derived from this software without prior written permission. For
32   *    written permission, please contact apache@apache.org.
33   *
34   * 5. Products derived from this software may not be called "Apache",
35   *    "Apache BCEL", nor may "Apache" appear in their name, without
36   *    prior written permission of the Apache Software Foundation.
37   *
38   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
39   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
40   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
42   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
44   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
45   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
46   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
47   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
48   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49   * SUCH DAMAGE.
50   * ====================================================================
51   *
52   * This software consists of voluntary contributions made by many
53   * individuals on behalf of the Apache Software Foundation.  For more
54   * information on the Apache Software Foundation, please see
55   * <http://www.apache.org/>.
56   */
57  
58  
59  import  org.apache.bcel.Constants;
60  import  java.io.*;
61  
62  /*** 
63   * This class is derived from the abstract 
64   * <A HREF="org.apache.bcel.classfile.Constant.html">Constant</A> class 
65   * and represents a reference to an int object.
66   *
67   * @version $Id: ConstantInteger.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $
68   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
69   * @see     Constant
70   */
71  public final class ConstantInteger extends Constant implements ConstantObject {
72    private int bytes;
73  
74    /*** 
75     * @param bytes Data
76     */
77    public ConstantInteger(int bytes)
78    {    
79      super(Constants.CONSTANT_Integer);
80      this.bytes = bytes;
81    }
82  
83    /***
84     * Initialize from another object.
85     */
86    public ConstantInteger(ConstantInteger c) {
87      this(c.getBytes());
88    }
89  
90    /*** 
91     * Initialize instance from file data.
92     *
93     * @param file Input stream
94     * @throws IOException
95     */
96    ConstantInteger(DataInputStream file) throws IOException
97    {    
98      this(file.readInt());
99    }
100 
101   /***
102    * Called by objects that are traversing the nodes of the tree implicitely
103    * defined by the contents of a Java class. I.e., the hierarchy of methods,
104    * fields, attributes, etc. spawns a tree of objects.
105    *
106    * @param v Visitor object
107    */
108   public void accept(Visitor v) {
109     v.visitConstantInteger(this);
110   }
111 
112   /***
113    * Dump constant integer to file stream in binary format.
114    *
115    * @param file Output file stream
116    * @throws IOException
117    */ 
118   public final void dump(DataOutputStream file) throws IOException
119   {
120     file.writeByte(tag);
121     file.writeInt(bytes);
122   }
123 
124   /***
125    * @return data, i.e., 4 bytes.
126    */  
127   public final int getBytes() { return bytes; }
128 
129   /***
130    * @param bytes.
131    */
132   public final void setBytes(int bytes) {
133     this.bytes = bytes;
134   }
135 
136   /***
137    * @return String representation.
138    */
139   public final String toString() {
140     return super.toString() + "(bytes = " + bytes + ")";
141   }    
142 
143   /*** @return Integer object
144    */
145   public Object getConstantValue(ConstantPool cp) {
146     return new Integer(bytes);
147   }
148 }
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