View Javadoc

1   /*
2    * Copyright  2000-2004 The Apache Software Foundation
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   *
16   */
17  package org.apache.bcel.classfile;
18  
19  import java.io.DataInputStream;
20  import java.io.DataOutputStream;
21  import java.io.IOException;
22  import org.apache.bcel.Constants;
23  
24  /*** 
25   * This class is derived from the abstract 
26   * <A HREF="org.apache.bcel.classfile.Constant.html">Constant</A> class 
27   * and represents a reference to a float object.
28   *
29   * @version $Id: ConstantFloat.java 386056 2006-03-15 11:31:56Z tcurdt $
30   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
31   * @see     Constant
32   */
33  public final class ConstantFloat extends Constant implements ConstantObject {
34  
35      private float bytes;
36  
37  
38      /*** 
39       * @param bytes Data
40       */
41      public ConstantFloat(float bytes) {
42          super(Constants.CONSTANT_Float);
43          this.bytes = bytes;
44      }
45  
46  
47      /***
48       * Initialize from another object. Note that both objects use the same
49       * references (shallow copy). Use clone() for a physical copy.
50       */
51      public ConstantFloat(ConstantFloat c) {
52          this(c.getBytes());
53      }
54  
55  
56      /*** 
57       * Initialize instance from file data.
58       *
59       * @param file Input stream
60       * @throws IOException
61       */
62      ConstantFloat(DataInputStream file) throws IOException {
63          this(file.readFloat());
64      }
65  
66  
67      /***
68       * Called by objects that are traversing the nodes of the tree implicitely
69       * defined by the contents of a Java class. I.e., the hierarchy of methods,
70       * fields, attributes, etc. spawns a tree of objects.
71       *
72       * @param v Visitor object
73       */
74      public void accept( Visitor v ) {
75          v.visitConstantFloat(this);
76      }
77  
78  
79      /***
80       * Dump constant float to file stream in binary format.
81       *
82       * @param file Output file stream
83       * @throws IOException
84       */
85      public final void dump( DataOutputStream file ) throws IOException {
86          file.writeByte(tag);
87          file.writeFloat(bytes);
88      }
89  
90  
91      /***
92       * @return data, i.e., 4 bytes.
93       */
94      public final float getBytes() {
95          return bytes;
96      }
97  
98  
99      /***
100      * @param bytes the raw bytes that represent this float
101      */
102     public final void setBytes( float bytes ) {
103         this.bytes = bytes;
104     }
105 
106 
107     /***
108      * @return String representation.
109      */
110     public final String toString() {
111         return super.toString() + "(bytes = " + bytes + ")";
112     }
113 
114 
115     /*** @return Float object
116      */
117     public Object getConstantValue( ConstantPool cp ) {
118         return new Float(bytes);
119     }
120 }