org.aksw.jena_sparql_api.io.binseach

Class BufferFromInputStream.ByteArrayChannel

java.lang.Object

org.aksw.jena_sparql_api.io.binseach.ReadableByteChannelBase

org.aksw.jena_sparql_api.io.binseach.BufferFromInputStream.ByteArrayChannel

All Implemented Interfaces:

Closeable, AutoCloseable, ByteChannel, Channel, ReadableByteChannel, SeekableByteChannel, WritableByteChannel, Seekable

Enclosing class:

BufferFromInputStream

public class BufferFromInputStream.ByteArrayChannel
extends ReadableByteChannelBase
implements SeekableByteChannel, Seekable

Field Summary

Fields

Modifier and Type	Field and Description
protected BufferFromInputStream.BucketPointer	pointer
protected long	pos

Fields inherited from class org.aksw.jena_sparql_api.io.binseach.ReadableByteChannelBase

isOpen, maxReadSize

Constructor Summary

Constructors

Constructor and Description
ByteArrayChannel(long pos, BufferFromInputStream.BucketPointer pointer)

Method Summary

Modifier and Type	Method and Description
int	checkNext(int len, boolean changePos) Attempt to advance the position by the given number of bytes.
int	checkPrev(int len, boolean changePos) The method assumes that the current position is in the valid range
Seekable	clone()
byte	get() Read a byte at the current position
long	getPos() Optional operation.
boolean	isPosAfterEnd() The state of a seekable may be one unit beyond the end.
boolean	isPosBeforeStart() The state of a seekable may be one unit before the start.
long	position()
BufferFromInputStream.ByteArrayChannel	position(long pos) Setting a position outside of the size of the entity is valid will will cause a read to immediately return an EOF See ReadableByteChannel
void	posToEnd() Optional operation.
void	posToStart() Optional operation.
boolean	prevPos(int len) Attempt to step back the position by the given number of bytes.
int	readActual(ByteBuffer dst)
String	readString(int len)
void	setPos(long pos) Optional operation.
long	size()
SeekableByteChannel	truncate(long size)
int	write(ByteBuffer src)

Methods inherited from class org.aksw.jena_sparql_api.io.binseach.ReadableByteChannelBase

close, isOpen, isUnderlyingEntityKnownToBeClosed, read

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.nio.channels.SeekableByteChannel

read

Methods inherited from interface java.nio.channels.Channel

close, isOpen

Methods inherited from interface org.aksw.jena_sparql_api.io.binseach.Seekable

binarySearch, cloneObject, close, compareArrays, compareToPrefix, deltaPos, get, nextPos, peekNextBytes, posToNext, posToNext, posToPrev, read

Field Detail

pos

protected long pos

pointer

protected BufferFromInputStream.BucketPointer pointer

Constructor Detail

ByteArrayChannel

public ByteArrayChannel(long pos,
                        BufferFromInputStream.BucketPointer pointer)

Method Detail

position

public BufferFromInputStream.ByteArrayChannel position(long pos)

Setting a position outside of the size of the entity is valid will will cause a read to immediately return an EOF See ReadableByteChannel

Specified by:

position in interface SeekableByteChannel

Parameters:

pos -

Returns:

position

public long position()

Specified by:

position in interface SeekableByteChannel

readActual

public int readActual(ByteBuffer dst)
               throws IOException

Specified by:

readActual in class ReadableByteChannelBase

Throws:

IOException

write

public int write(ByteBuffer src)
          throws IOException

Specified by:

write in interface SeekableByteChannel

Specified by:

write in interface WritableByteChannel

Throws:

IOException

size

public long size()
          throws IOException

Specified by:

size in interface SeekableByteChannel

Specified by:

size in interface Seekable

Throws:

IOException

truncate

public SeekableByteChannel truncate(long size)
                             throws IOException

Specified by:

truncate in interface SeekableByteChannel

Throws:

IOException

clone

public Seekable clone()

Specified by:

clone in interface Seekable

Overrides:

clone in class Object

getPos

public long getPos()
            throws IOException

Description copied from interface: Seekable

Optional operation. Get the position in this seekable

Specified by:

getPos in interface Seekable

Returns:

Throws:

IOException

setPos

public void setPos(long pos)
            throws IOException

Description copied from interface: Seekable

Optional operation. Get the position in this seekable

Specified by:

setPos in interface Seekable

Throws:

IOException

posToStart

public void posToStart()
                throws IOException

Description copied from interface: Seekable

Optional operation. Move one unit before the start of the seekable; raises an exception on infinite seekables

Specified by:

posToStart in interface Seekable

Throws:

IOException

posToEnd

public void posToEnd()
              throws IOException

Description copied from interface: Seekable

Optional operation. Move to one unit beyond the end of the seekable; raises an exception on infinite seekables

Specified by:

posToEnd in interface Seekable

Throws:

IOException

isPosBeforeStart

public boolean isPosBeforeStart()
                         throws IOException

Description copied from interface: Seekable

The state of a seekable may be one unit before the start. In this state, if the seekable is non-empty, nextPos(1) must be a valid position

Specified by:

isPosBeforeStart in interface Seekable

Returns:

Throws:

IOException

isPosAfterEnd

public boolean isPosAfterEnd()
                      throws IOException

Description copied from interface: Seekable

The state of a seekable may be one unit beyond the end. In this state, if the seekable is non-empty, prevPos(1) must be a valid position

Specified by:

isPosAfterEnd in interface Seekable

Returns:

Throws:

IOException

prevPos

public boolean prevPos(int len)
                throws IOException

Description copied from interface: Seekable

Attempt to step back the position by the given number of bytes. Argument must not be negative.

Specified by:

prevPos in interface Seekable

Returns:

True if the position was changed by the *requested* amount of bytes. False means that the position was unchanged.

Throws:

IOException

readString

public String readString(int len)
                  throws IOException

Specified by:

readString in interface Seekable

Throws:

IOException

checkNext

public int checkNext(int len,
                     boolean changePos)
              throws IOException

Description copied from interface: Seekable

Attempt to advance the position by the given number of bytes. Return the number of bytes by which the position was changed. Returning less bytes than requested implies that a end position was reached which cannot be passed. This method cannot pass beyond the end - i.e. isPosAfterEnd cannot change from false to true by calling this method.

Specified by:

checkNext in interface Seekable

Returns:

Throws:

IOException

get

public byte get()
         throws IOException

Description copied from interface: Seekable

Read a byte at the current position

Specified by:

get in interface Seekable

Returns:

The byte at the current position if the position is valid

Throws:

IOException

checkPrev

public int checkPrev(int len,
                     boolean changePos)
              throws IOException

The method assumes that the current position is in the valid range

Specified by:

checkPrev in interface Seekable

Throws:

IOException