import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class GzipPacker implements Packer {
    private final Packer delegate;

    public GzipPacker(Packer delegate) {
        this.delegate = delegate;
    }

    @Override
    public void pack(List<DataSource> inputs, DataTarget output) throws IOException {

        .put("tar.jtar", new JTarPacker(4))
        .put("tar.small", new CommonsTarPacker(2))
        .put("tar.large", new CommonsTarPacker(64))
        .put("tar.gz", new GzipPacker(new CommonsTarPacker(4)))
        .put("zip", new ZipPacker(4))
        .build();

    private static final Map<String, DataAccessor> ACCESSORS = ImmutableMap.<String, DataAccessor>builder()

import java.io.IOException;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

public class ZipPacker implements Packer {

    private final byte[] buffer;

    public ZipPacker(int bufferSizeInKBytes) {
        this.buffer = new byte[bufferSizeInKBytes];
    }

    @Override