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 Double object.
64   *
65   * @version $Id: ConstantDouble.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 ConstantDouble extends Constant implements ConstantObject {
70    private double bytes;
71  
72    /*** 
73     * @param bytes Data
74     */
75    public ConstantDouble(double bytes) {    
76      super(Constants.CONSTANT_Double);
77      this.bytes = bytes;
78    }    
79  
80    /***
81     * Initialize from another object.
82     */
83    public ConstantDouble(ConstantDouble c) {
84      this(c.getBytes());
85    }    
86  
87    /*** 
88     * Initialize instance from file data.
89     *
90     * @param file Input stream
91     * @throws IOException
92     */
93    ConstantDouble(DataInputStream file) throws IOException
94    {    
95      this(file.readDouble());
96    }    
97  
98    /***
99     * Called by objects that are traversing the nodes of the tree implicitely
100    * defined by the contents of a Java class. I.e., the hierarchy of methods,
101    * fields, attributes, etc. spawns a tree of objects.
102    *
103    * @param v Visitor object
104    */
105   public void accept(Visitor v) {
106     v.visitConstantDouble(this);
107   }    
108   /***
109    * Dump constant double to file stream in binary format.
110    *
111    * @param file Output file stream
112    * @throws IOException
113    */ 
114   public final void dump(DataOutputStream file) throws IOException
115   {
116     file.writeByte(tag);
117     file.writeDouble(bytes);
118   }    
119   /***
120    * @return data, i.e., 8 bytes.
121    */  
122   public final double getBytes() { return bytes; }    
123   /***
124    * @param bytes.
125    */
126   public final void setBytes(double bytes) {
127     this.bytes = bytes;
128   }    
129   /***
130    * @return String representation.
131    */
132   public final String toString()
133   {
134     return super.toString() + "(bytes = " + bytes + ")";
135   }    
136 
137   /*** @return Double object
138    */
139   public Object getConstantValue(ConstantPool cp) {
140     return new Double(bytes);
141   }
142 }
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