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 */
017package org.apache.bcel.classfile;
018
019import java.io.DataInput;
020import java.io.DataOutputStream;
021import java.io.IOException;
022
023import org.apache.bcel.Const;
024
025/**
026 * This class is derived from the abstract {@link Constant} and represents a reference to a float object.
027 *
028 * @see Constant
029 */
030public final class ConstantFloat extends Constant implements ConstantObject {
031
032    private float bytes;
033
034    /**
035     * Initialize from another object. Note that both objects use the same references (shallow copy). Use clone() for a
036     * physical copy.
037     *
038     * @param c Source to copy.
039     */
040    public ConstantFloat(final ConstantFloat c) {
041        this(c.getBytes());
042    }
043
044    /**
045     * Initialize instance from file data.
046     *
047     * @param file Input stream
048     * @throws IOException if an I/O error occurs.
049     */
050    ConstantFloat(final DataInput file) throws IOException {
051        this(file.readFloat());
052    }
053
054    /**
055     * @param bytes Data
056     */
057    public ConstantFloat(final float bytes) {
058        super(Const.CONSTANT_Float);
059        this.bytes = bytes;
060    }
061
062    /**
063     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
064     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
065     *
066     * @param v Visitor object
067     */
068    @Override
069    public void accept(final Visitor v) {
070        v.visitConstantFloat(this);
071    }
072
073    /**
074     * Dump constant float to file stream in binary format.
075     *
076     * @param file Output file stream
077     * @throws IOException if an I/O error occurs.
078     */
079    @Override
080    public void dump(final DataOutputStream file) throws IOException {
081        file.writeByte(super.getTag());
082        file.writeFloat(bytes);
083    }
084
085    /**
086     * @return data, i.e., 4 bytes.
087     */
088    public float getBytes() {
089        return bytes;
090    }
091
092    /**
093     * @return Float object
094     */
095    @Override
096    public Object getConstantValue(final ConstantPool cp) {
097        return Float.valueOf(bytes);
098    }
099
100    /**
101     * @param bytes the raw bytes that represent this float
102     */
103    public void setBytes(final float bytes) {
104        this.bytes = bytes;
105    }
106
107    /**
108     * @return String representation.
109     */
110    @Override
111    public String toString() {
112        return super.toString() + "(bytes = " + bytes + ")";
113    }
114}