    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}