Class BlockSourceChannel

java.lang.Object

org.aksw.commons.io.hadoop.binseach.v2.BlockSourceChannel

All Implemented Interfaces:

Closeable, AutoCloseable, Cloneable, Channel, HasArrayOps<byte[]>, HasPosition, ReadableChannel<byte[]>, ReadableSource<byte[]>, SeekableReadableChannel<byte[]>

public class BlockSourceChannel
extends Object
implements SeekableReadableChannel<byte[]>

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	blockMode
protected final org.apache.hadoop.io.compress.SplittableCompressionCodec	codec
protected ReadableChannelWithBlockAdvertisement	decodedChannel	The current non-seekable channel.
protected long	decodedChannelStart	The decoded channel is recreated on every first read after calling position(long).
protected org.apache.hadoop.io.compress.SplitCompressionInputStream	decodedIn
protected final SeekableReadableChannel<byte[]>	encodedChannel
protected ByteBuffer	pendingRead
protected int	positionInBlock	The starting block id will be set after reading the first byte from the stream after its creation or setting the position.

Constructor Summary

Constructors

Constructor	Description
BlockSourceChannel(SeekableReadableChannel<byte[]> seekable, org.apache.hadoop.io.compress.SplittableCompressionCodec codec, boolean blockMode)

Method Summary

Modifier and Type	Method	Description
boolean	adjustToNextBlock()
SeekableReadableChannel<byte[]>	cloneObject()
void	close()
protected void	closeDecodedChannel()
void	ensureDecodedChannel()
ArrayOps<byte[]>	getArrayOps()
long	getCurrentBlockId()
int	getPositionInBlock()
long	getStartingBlockId()
boolean	isOpen()
long	position()	/ if (startingBlockId == -1) { / startingBlockId = nextNextBlockId; // This may already be the next block / currentBlockId = nextNextBlockId; / nextBlockId = nextNextBlockId; / } else { / currentBlockId = nextNextBlockId; / nextBlockId = nextNextBlockId; / }
void	position(long newPosition)
int	read(byte[] array, int position, int length)
protected void	resetTracker()

Methods inherited from class Object

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

Methods inherited from interface ReadableSource

readRaw

Field Details

codec

protected final org.apache.hadoop.io.compress.SplittableCompressionCodec codec

encodedChannel

protected final SeekableReadableChannel<byte[]> encodedChannel

decodedChannelStart

protected long decodedChannelStart

The decoded channel is recreated on every first read after calling position(long).

decodedChannel

protected ReadableChannelWithBlockAdvertisement decodedChannel

The current non-seekable channel.

positionInBlock

protected int positionInBlock

The starting block id will be set after reading the first byte from the stream after its creation or setting the position.

pendingRead

protected ByteBuffer pendingRead

decodedIn

protected org.apache.hadoop.io.compress.SplitCompressionInputStream decodedIn

blockMode

protected boolean blockMode

Constructor Details

BlockSourceChannel

public BlockSourceChannel(SeekableReadableChannel<byte[]> seekable,
 org.apache.hadoop.io.compress.SplittableCompressionCodec codec,
 boolean blockMode)

Method Details

ensureDecodedChannel

public void ensureDecodedChannel()
                          throws IOException

Throws:

IOException

resetTracker

protected void resetTracker()

getStartingBlockId

public long getStartingBlockId()
                        throws IOException

Throws:

IOException

getCurrentBlockId

public long getCurrentBlockId()
                       throws IOException

Throws:

IOException

getPositionInBlock

public int getPositionInBlock()

adjustToNextBlock

public boolean adjustToNextBlock()
                          throws IOException

Throws:

IOException

closeDecodedChannel

protected void closeDecodedChannel()
                            throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Channel

Specified by:

close in interface Closeable

Throws:

IOException

isOpen

public boolean isOpen()

Specified by:

isOpen in interface Channel

read

public int read(byte[] array,
 int position,
 int length)
         throws IOException

Specified by:

read in interface ReadableSource<byte[]>

Throws:

IOException

position

public long position()
              throws IOException

/ if (startingBlockId == -1) { / startingBlockId = nextNextBlockId; // This may already be the next block / currentBlockId = nextNextBlockId; / nextBlockId = nextNextBlockId; / } else { / currentBlockId = nextNextBlockId; / nextBlockId = nextNextBlockId; / }

Specified by:

position in interface HasPosition

Throws:

IOException

position

public void position(long newPosition)
              throws IOException

Specified by:

position in interface HasPosition

Throws:

IOException

getArrayOps

public ArrayOps<byte[]> getArrayOps()

Specified by:

getArrayOps in interface HasArrayOps<byte[]>

cloneObject

public SeekableReadableChannel<byte[]> cloneObject()

Specified by:

cloneObject in interface SeekableReadableChannel<byte[]>