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• CompressedOutput.java

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org.vesalainen.io.CompressedOutput Maven / Gradle / Ivy

/*
 * Copyright (C) 2015 tkv
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.vesalainen.io;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.util.UUID;
import org.vesalainen.util.BitArray;

/**
 * A class for compressing writing class public fields compressed. It is suitable
 * for fields that doesn't change much.
 * 
Read compressed data with CompressedInput
 * @author tkv
 * @param  Object to be compressed
 * @see org.vesalainen.io.CompressedInput
 */
public class CompressedOutput extends CompressedIO
{
    private final byte[] buf2;
    private DataOutputStream dos;
    private OutputStream out;
    private ArrayOutputStream array;
    private DataOutputStream data;
    /**
     * Creates CompressedOutput
     * @param out 
     * @param obj
     * @throws IOException 
     */
    public CompressedOutput(OutputStream out, T obj) throws IOException
    {
        super(obj);
        this.out = out;
        this.uuid = UUID.randomUUID();
        
        fields = cls.getFields();

        for (Field field : fields)
        {
            Class type = field.getType();
            bytes += getBytes(type.getName());
        }
        buf1 = new byte[bytes];
        buf2 = new byte[bytes];
        bitArray = new BitArray(bytes);
        bits = bitArray.getArray();
    }
    /**
     * Writes objects fields to stream
     * @return Compression rate
     * @throws IOException 
     */
    public float write() throws IOException
    {
        if (dos == null)
        {
            dos = new DataOutputStream(out);
            array = new ArrayOutputStream(buf1);
            data = new DataOutputStream(array);

            dos.writeUTF(cls.getName());
            dos.writeShort(fields.length);
            for (Field field : fields)
            {
                Class type = field.getType();
                dos.writeUTF(field.getName());
                dos.writeUTF(type.getName());
            }
            dos.writeLong(uuid.getMostSignificantBits());
            dos.writeLong(uuid.getLeastSignificantBits());
        }
        array.reset();
        for (Field field : fields)
        {
            write(data, field);
        }
        for (int ii=0;ii