    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 $Id$
    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}