Package org.aksw.commons.io.input

Class ReadableChannelWithLimitByDelimiter<A,X extends ReadableChannel<A>>

java.lang.Object

org.aksw.commons.util.closeable.AutoCloseableWrapperBase<T>

org.aksw.commons.io.shared.ChannelDecoratorBase<X>

org.aksw.commons.io.input.ReadableChannelDecoratorBase<A,X>

org.aksw.commons.io.input.ReadableChannelWithLimitByDelimiter<A,X>

Type Parameters:

A -

X -

All Implemented Interfaces:

Closeable, AutoCloseable, Channel, HasArrayOps<A>, ReadableChannel<A>, ReadableSource<A>

public class ReadableChannelWithLimitByDelimiter<A,X extends ReadableChannel<A>>
extends ReadableChannelDecoratorBase<A,X>

Wrap a stream such that reading is cut off at the first delimiter (including it) after a certain position. Typically used to limit the stream to the first newline after a split. If the underlying channel's read method returns -2 it is interpreted as an end-of-block (EOB) marker. This class limits the stream on the first delimiter after EOB. This class hides any encountered block markers: Its read method either returns a positive non-zero integer for the number of bytes read or -1 if either the final delimiter has been reached or the underlying channel has been consumed.

Field Summary

Fields

Modifier and Type	Field	Description
protected long	bytesRead
protected byte	delimiter
protected A	excessBuffer
protected GetPosition	getPosition
protected boolean	isBlockMode
protected boolean	isInEofState
protected long	nextSplitOffset

Fields inherited from class org.aksw.commons.util.closeable.AutoCloseableWrapperBase

delegate

Constructor Summary

Constructors

Constructor	Description
ReadableChannelWithLimitByDelimiter(X delegate, GetPosition getPosition, boolean isBlockMode, byte delimiter, long nextSplitOffset)

Method Summary

Modifier and Type	Method	Description
long	getBytesRead()
int	read(A array, int position, int length)	Read method following the usual InputStream protocol.

Methods inherited from class org.aksw.commons.io.input.ReadableChannelDecoratorBase

getArrayOps

Methods inherited from class org.aksw.commons.io.shared.ChannelDecoratorBase

close, isOpen

Methods inherited from class org.aksw.commons.util.closeable.AutoCloseableWrapperBase

close, getDelegate

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.nio.channels.Channel

close, isOpen

Methods inherited from interface org.aksw.commons.io.input.ReadableSource

readRaw

Field Details

nextSplitOffset

protected long nextSplitOffset

delimiter

protected byte delimiter

isInEofState

protected boolean isInEofState

bytesRead

protected long bytesRead

excessBuffer

protected A excessBuffer

getPosition

protected GetPosition getPosition

isBlockMode

protected boolean isBlockMode

Constructor Details

ReadableChannelWithLimitByDelimiter

public ReadableChannelWithLimitByDelimiter(X delegate,
 GetPosition getPosition,
 boolean isBlockMode,
 byte delimiter,
 long nextSplitOffset)

Parameters:

delegate -

getPosition -

isBlockMode - If true then expect block boundaries to be advertised with -2 results of reads.

delimiter -

nextSplitOffset -

Method Details

read

public int read(A array,
 int position,
 int length)
         throws IOException

Description copied from interface: ReadableSource

Read method following the usual InputStream protocol.

Specified by:

read in interface ReadableSource<A>

Overrides:

read in class ReadableChannelDecoratorBase<A,X extends ReadableChannel<A>>

Parameters:

array - The array into which to put the read data

position - Offset into array where to start writing

length - Maximum number of items to read.

Returns:

The number of items read. Return -1 if end of data was reached, and 0 iff length was 0.

Throws:

IOException

getBytesRead

public long getBytesRead()