org.apache.hadoop.io.compress.bzip2

类 BZip2DummyDecompressor

java.lang.Object

org.apache.hadoop.io.compress.bzip2.BZip2DummyDecompressor

所有已实现的接口:

Decompressor

public class BZip2DummyDecompressor
extends Object
implements Decompressor

This is a dummy decompressor for BZip2.

构造器概要

构造器

构造器和说明
BZip2DummyDecompressor()

方法概要

方法

限定符和类型	方法和说明
int	decompress(byte[] b, int off, int len) Fills specified buffer with uncompressed data.
void	end() Closes the decompressor and discards any unprocessed input.
boolean	finished() Returns true if the end of the decompressed data output stream has been reached.
int	getRemaining() Returns the number of bytes remaining in the compressed-data buffer; typically called after the decompressor has finished decompressing the current gzip stream (a.k.a.
boolean	needsDictionary() Returns true if a preset dictionary is needed for decompression.
boolean	needsInput() Returns true if the input data buffer is empty and Decompressor.setInput(byte[], int, int) should be called to provide more input.
void	reset() Resets decompressor and input and output buffers so that a new set of input data can be processed.
void	setDictionary(byte[] b, int off, int len) Sets preset dictionary for compression.
void	setInput(byte[] b, int off, int len) Sets input data for decompression.

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

BZip2DummyDecompressor

public BZip2DummyDecompressor()

方法详细资料

decompress

public int decompress(byte[] b,
             int off,
             int len)
               throws IOException

从接口复制的说明: Decompressor

Fills specified buffer with uncompressed data. Returns actual number of bytes of uncompressed data. A return value of 0 indicates that Decompressor.needsInput() should be called in order to determine if more input data is required.

指定者:

decompress 在接口中 Decompressor

参数:

b - Buffer for the compressed data

off - Start offset of the data

len - Size of the buffer

返回:

The actual number of bytes of compressed data.

抛出:

IOException

end

public void end()

从接口复制的说明: Decompressor

Closes the decompressor and discards any unprocessed input.

指定者:

end 在接口中 Decompressor

finished

public boolean finished()

从接口复制的说明: Decompressor

Returns true if the end of the decompressed data output stream has been reached.

指定者:

finished 在接口中 Decompressor

返回:

true if the end of the decompressed data output stream has been reached.

needsDictionary

public boolean needsDictionary()

从接口复制的说明: Decompressor

Returns true if a preset dictionary is needed for decompression.

指定者:

needsDictionary 在接口中 Decompressor

返回:

true if a preset dictionary is needed for decompression

needsInput

public boolean needsInput()

从接口复制的说明: Decompressor

Returns true if the input data buffer is empty and Decompressor.setInput(byte[], int, int) should be called to provide more input.

指定者:

needsInput 在接口中 Decompressor

返回:

true if the input data buffer is empty and Decompressor.setInput(byte[], int, int) should be called in order to provide more input.

getRemaining

public int getRemaining()

从接口复制的说明: Decompressor

Returns the number of bytes remaining in the compressed-data buffer; typically called after the decompressor has finished decompressing the current gzip stream (a.k.a. "member").

指定者:

getRemaining 在接口中 Decompressor

reset

public void reset()

从接口复制的说明: Decompressor

Resets decompressor and input and output buffers so that a new set of input data can be processed.

指定者:

reset 在接口中 Decompressor

setDictionary

public void setDictionary(byte[] b,
                 int off,
                 int len)

从接口复制的说明: Decompressor

Sets preset dictionary for compression. A preset dictionary is used when the history buffer can be predetermined.

指定者:

setDictionary 在接口中 Decompressor

参数:

b - Dictionary data bytes

off - Start offset

len - Length

setInput

public void setInput(byte[] b,
            int off,
            int len)

从接口复制的说明: Decompressor

Sets input data for decompression. This should be called if and only if Decompressor.needsInput() returns true indicating that more input data is required. (Both native and non-native versions of various Decompressors require that the data passed in via b[] remain unmodified until the caller is explicitly notified--via Decompressor.needsInput()--that the buffer may be safely modified. With this requirement, an extra buffer-copy can be avoided.)

指定者:

setInput 在接口中 Decompressor

参数:

b - Input data

off - Start offset

len - Length