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