001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.classfile;
019
020import java.io.DataInput;
021import java.io.DataOutputStream;
022import java.io.IOException;
023
024import org.apache.bcel.Const;
025
026/** 
027 * This class is derived from the abstract {@link Constant} 
028 * and represents a reference to a float object.
029 *
030 * @version $Id: ConstantFloat.java 1747278 2016-06-07 17:28:43Z britter $
031 * @see     Constant
032 */
033public final class ConstantFloat extends Constant implements ConstantObject {
034
035    private float bytes;
036
037
038    /** 
039     * @param bytes Data
040     */
041    public ConstantFloat(final float bytes) {
042        super(Const.CONSTANT_Float);
043        this.bytes = bytes;
044    }
045
046
047    /**
048     * Initialize from another object. Note that both objects use the same
049     * references (shallow copy). Use clone() for a physical copy.
050     */
051    public ConstantFloat(final ConstantFloat c) {
052        this(c.getBytes());
053    }
054
055
056    /** 
057     * Initialize instance from file data.
058     *
059     * @param file Input stream
060     * @throws IOException
061     */
062    ConstantFloat(final DataInput file) throws IOException {
063        this(file.readFloat());
064    }
065
066
067    /**
068     * Called by objects that are traversing the nodes of the tree implicitely
069     * defined by the contents of a Java class. I.e., the hierarchy of methods,
070     * fields, attributes, etc. spawns a tree of objects.
071     *
072     * @param v Visitor object
073     */
074    @Override
075    public void accept( final Visitor v ) {
076        v.visitConstantFloat(this);
077    }
078
079
080    /**
081     * Dump constant float to file stream in binary format.
082     *
083     * @param file Output file stream
084     * @throws IOException
085     */
086    @Override
087    public final void dump( final DataOutputStream file ) throws IOException {
088        file.writeByte(super.getTag());
089        file.writeFloat(bytes);
090    }
091
092
093    /**
094     * @return data, i.e., 4 bytes.
095     */
096    public final float getBytes() {
097        return bytes;
098    }
099
100
101    /**
102     * @param bytes the raw bytes that represent this float
103     */
104    public final void setBytes( final float bytes ) {
105        this.bytes = bytes;
106    }
107
108
109    /**
110     * @return String representation.
111     */
112    @Override
113    public final String toString() {
114        return super.toString() + "(bytes = " + bytes + ")";
115    }
116
117
118    /** @return Float object
119     */
120    @Override
121    public Object getConstantValue( final ConstantPool cp ) {
122        return new Float(bytes);
123    }
124}