CompressionCodec (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.io.compress
Interface CompressionCodec

All Known Subinterfaces:
  SplittableCompressionCodec

All Known Implementing Classes:
  BZip2Codec, DefaultCodec, GzipCodec, SnappyCodec

    public interface CompressionCodec

This class encapsulates a streaming compression/decompression pair.

Method Summary
`Compressor` | `createCompressor()` Create a new `Compressor` for use by this `CompressionCodec`.
`Decompressor` | `createDecompressor()` Create a new `Decompressor` for use by this `CompressionCodec`.
`CompressionInputStream` | `createInputStream(InputStream in)` Create a stream decompressor that will read from the given input stream.
`CompressionInputStream` | `createInputStream(InputStream in, Decompressor decompressor)` Create a `CompressionInputStream` that will read from the given `InputStream` with the given `Decompressor`.
`CompressionOutputStream` | `createOutputStream(OutputStream out)` Create a `CompressionOutputStream` that will write to the given `OutputStream`.
`CompressionOutputStream` | `createOutputStream(OutputStream out, Compressor compressor)` Create a `CompressionOutputStream` that will write to the given `OutputStream` with the given `Compressor`.
`Class<? extends Compressor>` | `getCompressorType()` Get the type of `Compressor` needed by this `CompressionCodec`.
`Class<? extends Decompressor>` | `getDecompressorType()` Get the type of `Decompressor` needed by this `CompressionCodec`.
`String` | `getDefaultExtension()` Get the default filename extension for this kind of compression.

Method Detail

### createOutputStream

    CompressionOutputStream createOutputStream(OutputStream out)
                                               throws IOException

  Create a `CompressionOutputStream` that will write to the given `OutputStream`.

  Parameters:
    `out` - the location for the final output stream
  Returns:
    a stream the user can write uncompressed data to have it compressed
  Throws:
    `IOException`

### createOutputStream

    CompressionOutputStream createOutputStream(OutputStream out,
                                               Compressor compressor)
                                               throws IOException

  Create a `CompressionOutputStream` that will write to the given `OutputStream` with the given `Compressor`.

  Parameters:
    `out` - the location for the final output stream
    `compressor` - compressor to use
  Returns:
    a stream the user can write uncompressed data to have it compressed
  Throws:
    `IOException`

### getCompressorType

    Class<? extends Compressor> getCompressorType()

  Get the type of `Compressor` needed by this `CompressionCodec`.

  Returns:
    the type of compressor needed by this codec.

### createCompressor

    Compressor createCompressor()

  Create a new `Compressor` for use by this `CompressionCodec`.

  Returns:
    a new compressor for use by this codec

### createInputStream

    CompressionInputStream createInputStream(InputStream in)
                                             throws IOException

  Create a stream decompressor that will read from the given input stream.

  Parameters:
    `in` - the stream to read compressed bytes from
  Returns:
    a stream to read uncompressed bytes from
  Throws:
    `IOException`

### createInputStream

    CompressionInputStream createInputStream(InputStream in,
                                             Decompressor decompressor)
                                             throws IOException

  Create a `CompressionInputStream` that will read from the given `InputStream` with the given `Decompressor`.

  Parameters:
    `in` - the stream to read compressed bytes from
    `decompressor` - decompressor to use
  Returns:
    a stream to read uncompressed bytes from
  Throws:
    `IOException`

### getDecompressorType

    Class<? extends Decompressor> getDecompressorType()

  Get the type of `Decompressor` needed by this `CompressionCodec`.

  Returns:
    the type of decompressor needed by this codec.

### createDecompressor

    Decompressor createDecompressor()

  Create a new `Decompressor` for use by this `CompressionCodec`.

  Returns:
    a new decompressor for use by this codec

### getDefaultExtension

    String getDefaultExtension()

  Get the default filename extension for this kind of compression.

  Returns:
    the extension including the '.'

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