    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 Double object.
    027 *
    028 * @see Constant
    029 */
    030public final class ConstantDouble extends Constant implements ConstantObject {
    031
    032    private double bytes;
    033
    034    /**
    035     * Initialize from another object.
    036     *
    037     * @param c Source to copy.
    038     */
    039    public ConstantDouble(final ConstantDouble c) {
    040        this(c.getBytes());
    041    }
    042
    043    /**
    044     * Initialize instance from file data.
    045     *
    046     * @param file Input stream
    047     * @throws IOException if an I/O error occurs.
    048     */
    049    ConstantDouble(final DataInput file) throws IOException {
    050        this(file.readDouble());
    051    }
    052
    053    /**
    054     * @param bytes Data
    055     */
    056    public ConstantDouble(final double bytes) {
    057        super(Const.CONSTANT_Double);
    058        this.bytes = bytes;
    059    }
    060
    061    /**
    062     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
    063     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    064     *
    065     * @param v Visitor object
    066     */
    067    @Override
    068    public void accept(final Visitor v) {
    069        v.visitConstantDouble(this);
    070    }
    071
    072    /**
    073     * Dump constant double to file stream in binary format.
    074     *
    075     * @param file Output file stream
    076     * @throws IOException if an I/O error occurs.
    077     */
    078    @Override
    079    public void dump(final DataOutputStream file) throws IOException {
    080        file.writeByte(super.getTag());
    081        file.writeDouble(bytes);
    082    }
    083
    084    /**
    085     * @return data, i.e., 8 bytes.
    086     */
    087    public double getBytes() {
    088        return bytes;
    089    }
    090
    091    /**
    092     * @return Double object
    093     */
    094    @Override
    095    public Object getConstantValue(final ConstantPool cp) {
    096        return Double.valueOf(bytes);
    097    }
    098
    099    /**
    100     * @param bytes the raw bytes that represent the double value
    101     */
    102    public void setBytes(final double bytes) {
    103        this.bytes = bytes;
    104    }
    105
    106    /**
    107     * @return String representation.
    108     */
    109    @Override
    110    public String toString() {
    111        return super.toString() + "(bytes = " + bytes + ")";
    112    }
    113}