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Java > Open Source Codes > com > sun > org > apache > bcel > internal > classfile > ConstantDouble


1 package com.sun.org.apache.bcel.internal.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 com.sun.org.apache.bcel.internal.Constants;
58 import java.io.*;
59
60 /**
61  * This class is derived from the abstract
62  * <A HREF="com.sun.org.apache.bcel.internal.classfile.Constant.html">Constant</A> class
63  * and represents a reference to a Double object.
64  *
65  * @version $Id: ConstantDouble.java,v 1.1.1.1 2001/10/29 19:59:58 jvanzyl 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    * @throw 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    * @throw 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 JavaDoc toString()
133   {
134     return super.toString() + "(bytes = " + bytes + ")";
135   }
136
137   /** @return Double object
138    */
139   public Object JavaDoc getConstantValue(ConstantPool cp) {
140     return new Double JavaDoc(bytes);
141   }
142 }
143
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