Package opennlp.tools.postag

Class POSSampleSequenceStream

java.lang.Object

opennlp.tools.postag.POSSampleSequenceStream

All Implemented Interfaces:

AutoCloseable, SequenceStream<POSSample>, ObjectStream<Sequence<POSSample>>

public class POSSampleSequenceStream
extends Object
implements SequenceStream<POSSample>

A SequenceStream implementation encapsulating samples.

Constructor Summary

Constructors

Constructor	Description
POSSampleSequenceStream(ObjectStream<POSSample> psi)	Creates a POSSampleSequenceStream with given samples using a DefaultPOSContextGenerator.
POSSampleSequenceStream(ObjectStream<POSSample> psi, POSContextGenerator pcg)	Creates a POSSampleSequenceStream with given samples using a POSContextGenerator.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the ObjectStream and releases all allocated resources.
Sequence<POSSample>	read()	Returns the next ObjectStream object.
void	reset()	Repositions the stream at the beginning and the previously seen object sequence will be repeated exactly.
Event[]	updateContext(Sequence<POSSample> pss, AbstractModel model)	Creates a new event array based on the outcomes predicted by the specified parameters for the specified Sequence.

Methods inherited from class java.lang.Object

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

Constructor Detail

POSSampleSequenceStream

public POSSampleSequenceStream(ObjectStream<POSSample> psi)

Creates a POSSampleSequenceStream with given samples using a DefaultPOSContextGenerator.

Parameters:

psi - The data stream of samples.

POSSampleSequenceStream

public POSSampleSequenceStream(ObjectStream<POSSample> psi,
                               POSContextGenerator pcg)

Creates a POSSampleSequenceStream with given samples using a POSContextGenerator.

Parameters:

psi - The data stream of samples.

pcg - A POSContextGenerator which shall be used.

Method Detail

updateContext

public Event[] updateContext(Sequence<POSSample> pss,
                             AbstractModel model)

Description copied from interface: SequenceStream

Creates a new event array based on the outcomes predicted by the specified parameters for the specified Sequence.

Specified by:

updateContext in interface SequenceStream<POSSample>

Parameters:

pss - The Sequence to be evaluated.

model - The model to use.

Returns:

The resulting Event array.

read

public Sequence<POSSample> read()
                         throws IOException

Description copied from interface: ObjectStream

Returns the next ObjectStream object. Calling this method repeatedly until it returns null will return each object from the underlying source exactly once.

Specified by:

read in interface ObjectStream<Sequence<POSSample>>

Returns:

The next object or null to signal that the stream is exhausted.

Throws:

IOException - Thrown if there is an error during reading.

reset

public void reset()
           throws IOException,
                  UnsupportedOperationException

Description copied from interface: ObjectStream

Repositions the stream at the beginning and the previously seen object sequence will be repeated exactly. This method can be used to re-read the stream if multiple passes over the objects are required.

The implementation of this method is optional.

Specified by:

reset in interface ObjectStream<Sequence<POSSample>>

Throws:

IOException - Thrown if there is an error during resetting the stream.

UnsupportedOperationException - Thrown if the reset() is not supported. By default, this is the case.

close

public void close()
           throws IOException

Description copied from interface: ObjectStream

Closes the ObjectStream and releases all allocated resources. After close was called, it's not allowed to call ObjectStream.read() or ObjectStream.reset().

Specified by:

close in interface AutoCloseable

Specified by:

close in interface ObjectStream<Sequence<POSSample>>

Throws:

IOException - Thrown if there is an error during closing the stream.