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