BZip2Codec (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.io.compress
Class BZip2Codec

    java.lang.Object
      org.apache.hadoop.io.compress.BZip2Codec

All Implemented Interfaces:
  CompressionCodec, SplittableCompressionCodec

    public class BZip2Codec

extends Object
implements SplittableCompressionCodec

This class provides CompressionOutputStream and CompressionInputStream for compression and decompression. Currently we dont have an implementation of the Compressor and Decompressor interfaces, so those methods of CompressionCodec which have a Compressor or Decompressor type argument, throw UnsupportedOperationException.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.io.compress.SplittableCompressionCodec
`SplittableCompressionCodec.READ_MODE`

Constructor Summary
`BZip2Codec()` Creates a new instance of BZip2Codec

Method Summary
`Compressor` | `createCompressor()` This functionality is currently not supported.
`Decompressor` | `createDecompressor()` This functionality is currently not supported.
`CompressionInputStream` | `createInputStream(InputStream in)` Creates CompressionInputStream to be used to read off uncompressed data.
`CompressionInputStream` | `createInputStream(InputStream in, Decompressor decompressor)` This functionality is currently not supported.
`SplitCompressionInputStream` | `createInputStream(InputStream seekableIn, Decompressor decompressor, long start, long end, SplittableCompressionCodec.READ_MODE readMode)` Creates CompressionInputStream to be used to read off uncompressed data in one of the two reading modes.
`CompressionOutputStream` | `createOutputStream(OutputStream out)` Creates CompressionOutputStream for BZip2
`CompressionOutputStream` | `createOutputStream(OutputStream out, Compressor compressor)` Creates a compressor using given OutputStream.
`Class<? extends Compressor>` | `getCompressorType()` This functionality is currently not supported.
`Class<? extends Decompressor>` | `getDecompressorType()` This functionality is currently not supported.
`String` | `getDefaultExtension()` .bz2 is recognized as the default extension for compressed BZip2 files

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### BZip2Codec

    public BZip2Codec()

  Creates a new instance of BZip2Codec

Method Detail

### createOutputStream

    public CompressionOutputStream createOutputStream(OutputStream out)
                                               throws IOException

  Creates CompressionOutputStream for BZip2

  Specified by:
    `createOutputStream` in interface `CompressionCodec`
  Parameters:
    `out` - The output Stream
  Returns:
    The BZip2 CompressionOutputStream
  Throws:
    `IOException` - Throws IO exception

### createOutputStream

    public CompressionOutputStream createOutputStream(OutputStream out,
                                                      Compressor compressor)
                                               throws IOException

  Creates a compressor using given OutputStream.

  Specified by:
    `createOutputStream` in interface `CompressionCodec`
  Parameters:
    `out` - the location for the final output stream
    `compressor` - compressor to use
  Returns:
    CompressionOutputStream
  Throws:
    `IOException`

### getCompressorType

    public Class<? extends Compressor> getCompressorType()

  This functionality is currently not supported.

  Specified by:
    `getCompressorType` in interface `CompressionCodec`
  Returns:
    BZip2DummyCompressor.class

### createCompressor

    public Compressor createCompressor()

  This functionality is currently not supported.

  Specified by:
    `createCompressor` in interface `CompressionCodec`
  Returns:
    Compressor

### createInputStream

    public CompressionInputStream createInputStream(InputStream in)
                                             throws IOException

  Creates CompressionInputStream to be used to read off uncompressed data.

  Specified by:
    `createInputStream` in interface `CompressionCodec`
  Parameters:
    `in` - The InputStream
  Returns:
    Returns CompressionInputStream for BZip2
  Throws:
    `IOException` - Throws IOException

### createInputStream

    public CompressionInputStream createInputStream(InputStream in,
                                                    Decompressor decompressor)
                                             throws IOException

  This functionality is currently not supported.

  Specified by:
    `createInputStream` in interface `CompressionCodec`
  Parameters:
    `in` - the stream to read compressed bytes from
    `decompressor` - decompressor to use
  Returns:
    CompressionInputStream
  Throws:
    `IOException`

### createInputStream

    public SplitCompressionInputStream createInputStream(InputStream seekableIn,
                                                         Decompressor decompressor,
                                                         long start,
                                                         long end,
                                                         SplittableCompressionCodec.READ_MODE readMode)
                                                  throws IOException

  Creates CompressionInputStream to be used to read off uncompressed data in one of the two reading modes. i.e. Continuous or Blocked reading modes

  Specified by:
    `createInputStream` in interface `SplittableCompressionCodec`
  Parameters:
    `seekableIn` - The InputStream
    `start` - The start offset into the compressed stream
    `end` - The end offset into the compressed stream
    `readMode` - Controls whether progress is reported continuously or only at block boundaries.
  Returns:
    CompressionInputStream for BZip2 aligned at block boundaries
  Throws:
    `IOException`

### getDecompressorType

    public Class<? extends Decompressor> getDecompressorType()

  This functionality is currently not supported.

  Specified by:
    `getDecompressorType` in interface `CompressionCodec`
  Returns:
    BZip2DummyDecompressor.class

### createDecompressor

    public Decompressor createDecompressor()

  This functionality is currently not supported.

  Specified by:
    `createDecompressor` in interface `CompressionCodec`
  Returns:
    Decompressor

### getDefaultExtension

    public String getDefaultExtension()

  .bz2 is recognized as the default extension for compressed BZip2 files

  Specified by:
    `getDefaultExtension` in interface `CompressionCodec`
  Returns:
    A String telling the default bzip2 file extension

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