org.apache.hadoop.io.compress
Class CompressionInputStream

java.lang.Object
  java.io.InputStream
      org.apache.hadoop.io.compress.CompressionInputStream

All Implemented Interfaces:

Closeable, Seekable

Direct Known Subclasses:

DecompressorStream, SplitCompressionInputStream

public abstract class CompressionInputStream
extends InputStream
implements Seekable

A compression input stream.

Implementations are assumed to be buffered. This permits clients to reposition the underlying input stream then call resetState(), without having to also synchronize client buffers.

Field Summary

protected InputStream	in The input stream to be compressed.
protected long	maxAvailableData

Constructor Summary

protected

CompressionInputStream(InputStream in) Create a compression input stream that reads the decompressed bytes from the given stream.

Method Summary

void	close()
long	getPos() This method returns the current position in the stream.
abstract int	read(byte[] b, int off, int len) Read bytes from the stream.
abstract void	resetState() Reset the decompressor to its initial state and discard any buffered data, as the underlying stream may have been repositioned.
void	seek(long pos) This method is current not supported.
boolean	seekToNewSource(long targetPos) This method is current not supported.

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

in

protected final InputStream in

The input stream to be compressed.

maxAvailableData

protected long maxAvailableData

Constructor Detail

CompressionInputStream

protected CompressionInputStream(InputStream in)
                          throws IOException

Create a compression input stream that reads the decompressed bytes from the given stream.

Parameters:

in - The input stream to be compressed.

Throws:

IOException

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException

read

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

Read bytes from the stream. Made abstract to prevent leakage to underlying stream.

Overrides:

read in class InputStream

Throws:

IOException

resetState

public abstract void resetState()
                         throws IOException

Reset the decompressor to its initial state and discard any buffered data, as the underlying stream may have been repositioned.

Throws:

IOException

getPos

public long getPos()
            throws IOException

This method returns the current position in the stream.

Specified by:

getPos in interface Seekable

Returns:

Current position in stream as a long

Throws:

IOException

seek

public void seek(long pos)
          throws UnsupportedOperationException

This method is current not supported.

Specified by:

seek in interface Seekable

Throws:

UnsupportedOperationException

seekToNewSource

public boolean seekToNewSource(long targetPos)
                        throws UnsupportedOperationException

This method is current not supported.

Specified by:

seekToNewSource in interface Seekable

Throws:

UnsupportedOperationException