org.apache.commons.compress.compressors.snappy.SnappyCompressorInputStream Java Examples

/**
 * Decodes a byte array as an InputStream. The byte array may be compressed using some codec.
 * Reads from the returned stream will result in decompressed bytes.
 *
 * <p>This supports the same codecs as Avro's {@link CodecFactory}, namely those defined in
 * {@link DataFileConstants}.
 *
 * <ul>
 *   <li>"snappy" : Google's Snappy compression
 *   <li>"deflate" : deflate compression
 *   <li>"bzip2" : Bzip2 compression
 *   <li>"xz" : xz compression
 *   <li>"null" (the string, not the value): Uncompressed data
 * </ul>
 */
private static InputStream decodeAsInputStream(byte[] data, String codec) throws IOException {
  ByteArrayInputStream byteStream = new ByteArrayInputStream(data);
  switch (codec) {
    case DataFileConstants.SNAPPY_CODEC:
      return new SnappyCompressorInputStream(byteStream, 1 << 16 /* Avro uses 64KB blocks */);
    case DataFileConstants.DEFLATE_CODEC:
      // nowrap == true: Do not expect ZLIB header or checksum, as Avro does not write them.
      Inflater inflater = new Inflater(true);
      return new InflaterInputStream(byteStream, inflater);
    case DataFileConstants.XZ_CODEC:
      return new XZCompressorInputStream(byteStream);
    case DataFileConstants.BZIP2_CODEC:
      return new BZip2CompressorInputStream(byteStream);
    case DataFileConstants.NULL_CODEC:
      return byteStream;
    default:
      throw new IllegalArgumentException("Unsupported codec: " + codec);
  }
}
 

@Override
public InputStream createInputStream( final InputStream in ) throws IOException {
  return new SnappyCompressorInputStream( in );
}