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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 float object.
29   *
30   * @see Constant
31   */
32  public final class ConstantFloat extends Constant implements ConstantObject {
33  
34      private float bytes;
35  
36      /**
37       * Initialize from another object. Note that both objects use the same references (shallow copy). Use clone() for a
38       * physical copy.
39       *
40       * @param c Source to copy.
41       */
42      public ConstantFloat(final ConstantFloat c) {
43          this(c.getBytes());
44      }
45  
46      /**
47       * Initialize instance from file data.
48       *
49       * @param file Input stream
50       * @throws IOException if an I/O error occurs.
51       */
52      ConstantFloat(final DataInput file) throws IOException {
53          this(file.readFloat());
54      }
55  
56      /**
57       * @param bytes Data
58       */
59      public ConstantFloat(final float bytes) {
60          super(Const.CONSTANT_Float);
61          this.bytes = bytes;
62      }
63  
64      /**
65       * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
66       * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
67       *
68       * @param v Visitor object
69       */
70      @Override
71      public void accept(final Visitor v) {
72          v.visitConstantFloat(this);
73      }
74  
75      /**
76       * Dump constant float to file stream in binary format.
77       *
78       * @param file Output file stream
79       * @throws IOException if an I/O error occurs.
80       */
81      @Override
82      public void dump(final DataOutputStream file) throws IOException {
83          file.writeByte(super.getTag());
84          file.writeFloat(bytes);
85      }
86  
87      /**
88       * @return data, i.e., 4 bytes.
89       */
90      public float getBytes() {
91          return bytes;
92      }
93  
94      /**
95       * @return Float object
96       */
97      @Override
98      public Object getConstantValue(final ConstantPool cp) {
99          return Float.valueOf(bytes);
100     }
101 
102     /**
103      * @param bytes the raw bytes that represent this float
104      */
105     public void setBytes(final float bytes) {
106         this.bytes = bytes;
107     }
108 
109     /**
110      * @return String representation.
111      */
112     @Override
113     public String toString() {
114         return super.toString() + "(bytes = " + bytes + ")";
115     }
116 }