1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.bcel.classfile;
20
21 import java.io.DataInput;
22 import java.io.DataOutputStream;
23 import java.io.IOException;
24
25 import org.apache.bcel.Const;
26
27 /**
28 * This class is derived from the abstract {@link Constant} and represents a reference to a Double object.
29 *
30 * @see Constant
31 */
32 public final class ConstantDouble extends Constant implements ConstantObject {
33
34 private double bytes;
35
36 /**
37 * Initialize from another object.
38 *
39 * @param c Source to copy.
40 */
41 public ConstantDouble(final ConstantDouble c) {
42 this(c.getBytes());
43 }
44
45 /**
46 * Initialize instance from file data.
47 *
48 * @param file Input stream.
49 * @throws IOException if an I/O error occurs.
50 */
51 ConstantDouble(final DataInput file) throws IOException {
52 this(file.readDouble());
53 }
54
55 /**
56 * Constructs a ConstantDouble.
57 *
58 * @param bytes Data.
59 */
60 public ConstantDouble(final double bytes) {
61 super(Const.CONSTANT_Double);
62 this.bytes = bytes;
63 }
64
65 /**
66 * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
67 * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
68 *
69 * @param v Visitor object.
70 */
71 @Override
72 public void accept(final Visitor v) {
73 v.visitConstantDouble(this);
74 }
75
76 /**
77 * Dumps constant double to file stream in binary format.
78 *
79 * @param file Output file stream.
80 * @throws IOException if an I/O error occurs.
81 */
82 @Override
83 public void dump(final DataOutputStream file) throws IOException {
84 file.writeByte(super.getTag());
85 file.writeDouble(bytes);
86 }
87
88 /**
89 * Gets the data.
90 *
91 * @return data, that is, 8 bytes.
92 */
93 public double getBytes() {
94 return bytes;
95 }
96
97 /**
98 * Gets the Double object.
99 *
100 * @param cp the constant pool (not used).
101 * @return Double object.
102 */
103 @Override
104 public Object getConstantValue(final ConstantPool cp) {
105 return Double.valueOf(bytes);
106 }
107
108 /**
109 * Sets the raw bytes that represent the double value.
110 *
111 * @param bytes the raw bytes that represent the double value.
112 */
113 public void setBytes(final double bytes) {
114 this.bytes = bytes;
115 }
116
117 /**
118 * @return String representation.
119 */
120 @Override
121 public String toString() {
122 return super.toString() + "(bytes = " + bytes + ")";
123 }
124 }