org.apache.hadoop.io.compress

类 BZip2Codec

java.lang.Object

org.apache.hadoop.io.compress.BZip2Codec

所有已实现的接口:

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.

嵌套类概要

从接口继承的嵌套类/接口 org.apache.hadoop.io.compress.SplittableCompressionCodec

SplittableCompressionCodec.READ_MODE

构造器概要

构造器

构造器和说明
BZip2Codec() Creates a new instance of BZip2Codec

方法概要

方法

限定符和类型	方法和说明
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. i.e.
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

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

BZip2Codec

public BZip2Codec()

Creates a new instance of BZip2Codec

方法详细资料

createOutputStream

public CompressionOutputStream createOutputStream(OutputStream out)
                                           throws IOException

Creates CompressionOutputStream for BZip2

指定者:

createOutputStream 在接口中 CompressionCodec

参数:

out - The output Stream

返回:

The BZip2 CompressionOutputStream

抛出:

IOException - Throws IO exception

createOutputStream

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

Creates a compressor using given OutputStream.

指定者:

createOutputStream 在接口中 CompressionCodec

参数:

out - the location for the final output stream

compressor - compressor to use

返回:

CompressionOutputStream

抛出:

IOException

getCompressorType

public Class<? extends Compressor> getCompressorType()

This functionality is currently not supported.

指定者:

getCompressorType 在接口中 CompressionCodec

返回:

BZip2DummyCompressor.class

createCompressor

public Compressor createCompressor()

This functionality is currently not supported.

指定者:

createCompressor 在接口中 CompressionCodec

返回:

Compressor

createInputStream

public CompressionInputStream createInputStream(InputStream in)
                                         throws IOException

Creates CompressionInputStream to be used to read off uncompressed data.

指定者:

createInputStream 在接口中 CompressionCodec

参数:

in - The InputStream

返回:

Returns CompressionInputStream for BZip2

抛出:

IOException - Throws IOException

createInputStream

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

This functionality is currently not supported.

指定者:

createInputStream 在接口中 CompressionCodec

参数:

in - the stream to read compressed bytes from

decompressor - decompressor to use

返回:

CompressionInputStream

抛出:

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

指定者:

createInputStream 在接口中 SplittableCompressionCodec

参数:

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.

返回:

CompressionInputStream for BZip2 aligned at block boundaries

抛出:

IOException

getDecompressorType

public Class<? extends Decompressor> getDecompressorType()

This functionality is currently not supported.

指定者:

getDecompressorType 在接口中 CompressionCodec

返回:

BZip2DummyDecompressor.class

createDecompressor

public Decompressor createDecompressor()

This functionality is currently not supported.

指定者:

createDecompressor 在接口中 CompressionCodec

返回:

Decompressor

getDefaultExtension

public String getDefaultExtension()

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

指定者:

getDefaultExtension 在接口中 CompressionCodec

返回:

A String telling the default bzip2 file extension