org.apache.hadoop.io.compress.snappy

类 SnappyDecompressor

java.lang.Object

org.apache.hadoop.io.compress.snappy.SnappyDecompressor

所有已实现的接口:

Decompressor

public class SnappyDecompressor
extends Object
implements Decompressor

A Decompressor based on the snappy compression algorithm. http://code.google.com/p/snappy/

构造器概要

构造器

构造器和说明
SnappyDecompressor() Creates a new decompressor with the default buffer size.
SnappyDecompressor(int directBufferSize) Creates a new compressor.

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() Resets decompressor and input and output buffers so that a new set of input data can be processed.
boolean	finished() Returns true if the end of the decompressed data output stream has been reached.
int	getRemaining() Returns 0.
boolean	needsDictionary() Returns false.
boolean	needsInput() Returns true if the input data buffer is empty and 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) Does nothing.
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

SnappyDecompressor

public SnappyDecompressor(int directBufferSize)

Creates a new compressor.

参数:

directBufferSize - size of the direct buffer to be used.

SnappyDecompressor

public SnappyDecompressor()

Creates a new decompressor with the default buffer size.

方法详细资料

setInput

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

Sets input data for decompression. This should be called if and only if 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 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

setDictionary

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

Does nothing.

指定者:

setDictionary 在接口中 Decompressor

参数:

b - Dictionary data bytes

off - Start offset

len - Length

needsInput

public boolean needsInput()

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

needsDictionary

public boolean needsDictionary()

Returns false.

指定者:

needsDictionary 在接口中 Decompressor

返回:

false.

finished

public boolean finished()

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.

decompress

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

Fills specified buffer with uncompressed data. Returns actual number of bytes of uncompressed 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:

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

getRemaining

public int getRemaining()

Returns 0.

指定者:

getRemaining 在接口中 Decompressor

返回:

0.

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

end

public void end()

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

指定者:

end 在接口中 Decompressor