org.apache.hadoop.io.compress.bzip2

类 BZip2DummyCompressor

java.lang.Object

org.apache.hadoop.io.compress.bzip2.BZip2DummyCompressor

所有已实现的接口:

Compressor

public class BZip2DummyCompressor
extends Object
implements Compressor

This is a dummy compressor for BZip2.

构造器概要

构造器

构造器和说明
BZip2DummyCompressor()

方法概要

方法

限定符和类型	方法和说明
int	compress(byte[] b, int off, int len) Fills specified buffer with compressed data.
void	end() Closes the compressor and discards any unprocessed input.
void	finish() When called, indicates that compression should end with the current contents of the input buffer.
boolean	finished() Returns true if the end of the compressed data output stream has been reached.
long	getBytesRead() Return number of uncompressed bytes input so far.
long	getBytesWritten() Return number of compressed bytes output so far.
boolean	needsInput() Returns true if the input data buffer is empty and #setInput() should be called to provide more input.
void	reinit(Configuration conf) Prepare the compressor to be used in a new stream with settings defined in the given Configuration
void	reset() Resets compressor 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 compression.

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

BZip2DummyCompressor

public BZip2DummyCompressor()

方法详细资料

compress

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

从接口复制的说明: Compressor

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

指定者:

compress 在接口中 Compressor

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: Compressor

Closes the compressor and discards any unprocessed input.

指定者:

end 在接口中 Compressor

finish

public void finish()

从接口复制的说明: Compressor

When called, indicates that compression should end with the current contents of the input buffer.

指定者:

finish 在接口中 Compressor

finished

public boolean finished()

从接口复制的说明: Compressor

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

指定者:

finished 在接口中 Compressor

返回:

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

getBytesRead

public long getBytesRead()

从接口复制的说明: Compressor

Return number of uncompressed bytes input so far.

指定者:

getBytesRead 在接口中 Compressor

getBytesWritten

public long getBytesWritten()

从接口复制的说明: Compressor

Return number of compressed bytes output so far.

指定者:

getBytesWritten 在接口中 Compressor

needsInput

public boolean needsInput()

从接口复制的说明: Compressor

Returns true if the input data buffer is empty and #setInput() should be called to provide more input.

指定者:

needsInput 在接口中 Compressor

返回:

true if the input data buffer is empty and #setInput() should be called in order to provide more input.

reset

public void reset()

从接口复制的说明: Compressor

Resets compressor so that a new set of input data can be processed.

指定者:

reset 在接口中 Compressor

setDictionary

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

从接口复制的说明: Compressor

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 Compressor

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: Compressor

Sets input data for compression. This should be called whenever #needsInput() returns true indicating that more input data is required.

指定者:

setInput 在接口中 Compressor

参数:

b - Input data

off - Start offset

len - Length

reinit

public void reinit(Configuration conf)

从接口复制的说明: Compressor

Prepare the compressor to be used in a new stream with settings defined in the given Configuration

指定者:

reinit 在接口中 Compressor

参数:

conf - Configuration from which new setting are fetched