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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  package org.apache.bcel.classfile;
18  
19  import java.io.DataInput;
20  import java.io.DataOutputStream;
21  import java.io.IOException;
22  
23  import org.apache.bcel.Const;
24  
25  /**
26   * This class is derived from the abstract {@link Constant} and represents a reference to a Double object.
27   *
28   * @see Constant
29   */
30  public final class ConstantDouble extends Constant implements ConstantObject {
31  
32      private double bytes;
33  
34      /**
35       * Initialize from another object.
36       *
37       * @param c Source to copy.
38       */
39      public ConstantDouble(final ConstantDouble c) {
40          this(c.getBytes());
41      }
42  
43      /**
44       * Initialize instance from file data.
45       *
46       * @param file Input stream
47       * @throws IOException if an I/O error occurs.
48       */
49      ConstantDouble(final DataInput file) throws IOException {
50          this(file.readDouble());
51      }
52  
53      /**
54       * @param bytes Data
55       */
56      public ConstantDouble(final double bytes) {
57          super(Const.CONSTANT_Double);
58          this.bytes = bytes;
59      }
60  
61      /**
62       * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
63       * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
64       *
65       * @param v Visitor object
66       */
67      @Override
68      public void accept(final Visitor v) {
69          v.visitConstantDouble(this);
70      }
71  
72      /**
73       * Dump constant double to file stream in binary format.
74       *
75       * @param file Output file stream
76       * @throws IOException if an I/O error occurs.
77       */
78      @Override
79      public void dump(final DataOutputStream file) throws IOException {
80          file.writeByte(super.getTag());
81          file.writeDouble(bytes);
82      }
83  
84      /**
85       * @return data, i.e., 8 bytes.
86       */
87      public double getBytes() {
88          return bytes;
89      }
90  
91      /**
92       * @return Double object
93       */
94      @Override
95      public Object getConstantValue(final ConstantPool cp) {
96          return Double.valueOf(bytes);
97      }
98  
99      /**
100      * @param bytes the raw bytes that represent the double value
101      */
102     public void setBytes(final double bytes) {
103         this.bytes = bytes;
104     }
105 
106     /**
107      * @return String representation.
108      */
109     @Override
110     public String toString() {
111         return super.toString() + "(bytes = " + bytes + ")";
112     }
113 }