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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   *
17   */
18  package org.apache.bcel.classfile;
19  
20  import java.io.DataInput;
21  import java.io.DataOutputStream;
22  import java.io.IOException;
23  
24  import org.apache.bcel.Const;
25  
26  /**
27   * This class is derived from the abstract  {@link Constant}
28   * and represents a reference to a Double object.
29   *
30   * @version $Id: ConstantDouble.html 1018313 2017-09-18 09:03:04Z britter $
31   * @see     Constant
32   */
33  public final class ConstantDouble extends Constant implements ConstantObject {
34  
35      private double bytes;
36  
37  
38      /**
39       * @param bytes Data
40       */
41      public ConstantDouble(final double bytes) {
42          super(Const.CONSTANT_Double);
43          this.bytes = bytes;
44      }
45  
46  
47      /**
48       * Initialize from another object.
49       */
50      public ConstantDouble(final ConstantDouble c) {
51          this(c.getBytes());
52      }
53  
54  
55      /**
56       * Initialize instance from file data.
57       *
58       * @param file Input stream
59       * @throws IOException
60       */
61      ConstantDouble(final DataInput file) throws IOException {
62          this(file.readDouble());
63      }
64  
65  
66      /**
67       * Called by objects that are traversing the nodes of the tree implicitely
68       * defined by the contents of a Java class. I.e., the hierarchy of methods,
69       * fields, attributes, etc. spawns a tree of objects.
70       *
71       * @param v Visitor object
72       */
73      @Override
74      public void accept( final Visitor v ) {
75          v.visitConstantDouble(this);
76      }
77  
78  
79      /**
80       * Dump constant double to file stream in binary format.
81       *
82       * @param file Output file stream
83       * @throws IOException
84       */
85      @Override
86      public final void dump( final DataOutputStream file ) throws IOException {
87          file.writeByte(super.getTag());
88          file.writeDouble(bytes);
89      }
90  
91  
92      /**
93       * @return data, i.e., 8 bytes.
94       */
95      public final double getBytes() {
96          return bytes;
97      }
98  
99  
100     /**
101      * @param bytes the raw bytes that represent the double value
102      */
103     public final void setBytes( final double bytes ) {
104         this.bytes = bytes;
105     }
106 
107 
108     /**
109      * @return String representation.
110      */
111     @Override
112     public final String toString() {
113         return super.toString() + "(bytes = " + bytes + ")";
114     }
115 
116 
117     /** @return Double object
118      */
119     @Override
120     public Object getConstantValue( final ConstantPool cp ) {
121         return new Double(bytes);
122     }
123 }