Package org.apache.hadoop.io.compress

Class CompressionOutputStream

java.lang.Object

java.io.OutputStream

org.apache.hadoop.io.compress.CompressionOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable, IOStatisticsSource

Direct Known Subclasses:

CompressorStream

@Public
@Evolving
public abstract class CompressionOutputStream
extends OutputStream
implements IOStatisticsSource

A compression output stream.

Field Summary

Fields

Modifier and Type	Field	Description
protected final OutputStream	out	The output stream to be compressed.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CompressionOutputStream(OutputStream out)	Create a compression output stream that writes the compressed bytes to the given stream.

Method Summary

Modifier and Type	Method	Description
void	close()
abstract void	finish()	Finishes writing compressed data to the output stream without closing the underlying stream.
void	flush()
IOStatistics	getIOStatistics()	Return any IOStatistics provided by the underlying stream.
abstract void	resetState()	Reset the compression to the initial state.
abstract void	write(byte[] b, int off, int len)	Write compressed bytes to the stream.

Methods inherited from class java.io.OutputStream

nullOutputStream, write, write

Methods inherited from class java.lang.Object

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

Field Details

out

protected final OutputStream out

The output stream to be compressed.

Constructor Details

CompressionOutputStream

protected CompressionOutputStream(OutputStream out)

Create a compression output stream that writes the compressed bytes to the given stream.

Parameters:

out - out.

Method Details

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

write

public abstract void write(byte[] b,
 int off,
 int len)
                    throws IOException

Write compressed bytes to the stream. Made abstract to prevent leakage to underlying stream.

Overrides:

write in class OutputStream

Throws:

IOException

finish

public abstract void finish()
                     throws IOException

Finishes writing compressed data to the output stream without closing the underlying stream.

Throws:

IOException - raised on errors performing I/O.

resetState

public abstract void resetState()
                         throws IOException

Reset the compression to the initial state. Does not reset the underlying stream.

Throws:

IOException - raised on errors performing I/O.

getIOStatistics

public IOStatistics getIOStatistics()

Return any IOStatistics provided by the underlying stream.

Specified by:

getIOStatistics in interface IOStatisticsSource

Returns:

IO stats from the inner stream.