    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 long object.
    029 *
    030 * @see     Constant
    031 */
    032public final class ConstantLong extends Constant implements ConstantObject {
    033
    034    private long bytes;
    035
    036
    037    /**
    038     * @param bytes Data
    039     */
    040    public ConstantLong(final long bytes) {
    041        super(Const.CONSTANT_Long);
    042        this.bytes = bytes;
    043    }
    044
    045
    046    /**
    047     * Initialize from another object.
    048     */
    049    public ConstantLong(final ConstantLong c) {
    050        this(c.getBytes());
    051    }
    052
    053
    054    /**
    055     * Initialize instance from file data.
    056     *
    057     * @param file Input stream
    058     * @throws IOException
    059     */
    060    ConstantLong(final DataInput file) throws IOException {
    061        this(file.readLong());
    062    }
    063
    064
    065    /**
    066     * Called by objects that are traversing the nodes of the tree implicitely
    067     * defined by the contents of a Java class. I.e., the hierarchy of methods,
    068     * fields, attributes, etc. spawns a tree of objects.
    069     *
    070     * @param v Visitor object
    071     */
    072    @Override
    073    public void accept( final Visitor v ) {
    074        v.visitConstantLong(this);
    075    }
    076
    077
    078    /**
    079     * Dump constant long to file stream in binary format.
    080     *
    081     * @param file Output file stream
    082     * @throws IOException
    083     */
    084    @Override
    085    public void dump( final DataOutputStream file ) throws IOException {
    086        file.writeByte(super.getTag());
    087        file.writeLong(bytes);
    088    }
    089
    090
    091    /**
    092     * @return data, i.e., 8 bytes.
    093     */
    094    public long getBytes() {
    095        return bytes;
    096    }
    097
    098
    099    /**
    100     * @param bytes the raw bytes that represent this long
    101     */
    102    public void setBytes( final long bytes ) {
    103        this.bytes = bytes;
    104    }
    105
    106
    107    /**
    108     * @return String representation.
    109     */
    110    @Override
    111    public String toString() {
    112        return super.toString() + "(bytes = " + bytes + ")";
    113    }
    114
    115
    116    /** @return Long object
    117     */
    118    @Override
    119    public Object getConstantValue( final ConstantPool cp ) {
    120        return Long.valueOf(bytes);
    121    }
    122}