    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    public ConstantFloat(final ConstantFloat c) {
    039        this(c.getBytes());
    040    }
    041
    042    /**
    043     * Initialize instance from file data.
    044     *
    045     * @param file Input stream
    046     * @throws IOException if an I/O error occurs.
    047     */
    048    ConstantFloat(final DataInput file) throws IOException {
    049        this(file.readFloat());
    050    }
    051
    052    /**
    053     * @param bytes Data
    054     */
    055    public ConstantFloat(final float bytes) {
    056        super(Const.CONSTANT_Float);
    057        this.bytes = bytes;
    058    }
    059
    060    /**
    061     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
    062     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    063     *
    064     * @param v Visitor object
    065     */
    066    @Override
    067    public void accept(final Visitor v) {
    068        v.visitConstantFloat(this);
    069    }
    070
    071    /**
    072     * Dump constant float to file stream in binary format.
    073     *
    074     * @param file Output file stream
    075     * @throws IOException if an I/O error occurs.
    076     */
    077    @Override
    078    public void dump(final DataOutputStream file) throws IOException {
    079        file.writeByte(super.getTag());
    080        file.writeFloat(bytes);
    081    }
    082
    083    /**
    084     * @return data, i.e., 4 bytes.
    085     */
    086    public float getBytes() {
    087        return bytes;
    088    }
    089
    090    /**
    091     * @return Float object
    092     */
    093    @Override
    094    public Object getConstantValue(final ConstantPool cp) {
    095        return Float.valueOf(bytes);
    096    }
    097
    098    /**
    099     * @param bytes the raw bytes that represent this float
    100     */
    101    public void setBytes(final float bytes) {
    102        this.bytes = bytes;
    103    }
    104
    105    /**
    106     * @return String representation.
    107     */
    108    @Override
    109    public String toString() {
    110        return super.toString() + "(bytes = " + bytes + ")";
    111    }
    112}