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Data processing utilities for ClickHouse
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package com.clickhouse.data.compress;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.clickhouse.data.ClickHouseCompression;
import com.clickhouse.data.ClickHouseCompressionAlgorithm;
import com.clickhouse.data.ClickHouseInputStream;
import com.clickhouse.data.ClickHouseOutputStream;
import com.clickhouse.data.ClickHousePassThruStream;
import com.clickhouse.data.stream.WrappedInputStream;
import com.clickhouse.data.stream.WrappedOutputStream;

public final class Bz2Support {
    public static class DefaultImpl implements ClickHouseCompressionAlgorithm {
        protected int normalize(int level) {
            return level < org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream.MIN_BLOCKSIZE
                    || level > org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream.MAX_BLOCKSIZE
                            ? org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream.MAX_BLOCKSIZE
                            : level;
        }

        @Override
        public ClickHouseOutputStream compress(ClickHousePassThruStream stream, OutputStream output, int bufferSize,
                int level, Runnable postCloseAction) throws IOException {
            return new WrappedOutputStream(stream,
                    new org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream(output,
                            normalize(level)),
                    bufferSize, postCloseAction);
        }

        @Override
        public ClickHouseInputStream decompress(ClickHousePassThruStream stream, InputStream input, int bufferSize,
                int level, Runnable postCloseAction) throws IOException {
            return new WrappedInputStream(stream,
                    new org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream(input), bufferSize,
                    postCloseAction);
        }

        @Override
        public ClickHouseCompression getAlgorithm() {
            return ClickHouseCompression.BZ2;
        }
    }

    static final class Factory {
        private static final ClickHouseCompressionAlgorithm instance = new DefaultImpl();

        private Factory() {
        }
    }

    public static ClickHouseCompressionAlgorithm getInstance() {
        return Factory.instance;
    }

    private Bz2Support() {
    }
}