weka.gui.streams

Class InstanceJoiner

java.lang.Object

weka.gui.streams.InstanceJoiner

All Implemented Interfaces:

Serializable, EventListener, InstanceProducer, SerialInstanceListener

public class InstanceJoiner
extends Object
implements Serializable, InstanceProducer, SerialInstanceListener

A bean that joins two streams of instances into one.

Version:

$Revision: 8034 $

Author:

Len Trigg (trigg@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
InstanceJoiner() Setup the initial states of the member variables

Method Summary

Methods

Modifier and Type	Method and Description
void	addInstanceListener(InstanceListener ipl)
void	batchFinished() Signify that this batch of input to the filter is finished.
boolean	getDebug()
boolean	input(Instance instance)
boolean	inputFormat(Instances instanceInfo) Sets the format of the input instances.
void	instanceProduced(InstanceEvent e)
Instances	outputFormat() Gets the format of the output instances.
Instance	outputPeek() Output an instance after filtering but do not remove from the output queue.
void	removeInstanceListener(InstanceListener ipl)
void	secondInstanceProduced(InstanceEvent e)
void	setDebug(boolean debug)

Methods inherited from class java.lang.Object

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

Constructor Detail

InstanceJoiner

public InstanceJoiner()

Setup the initial states of the member variables

Method Detail

inputFormat

public boolean inputFormat(Instances instanceInfo)

Sets the format of the input instances. If the filter is able to determine the output format before seeing any input instances, it does so here. This default implementation assumes the output format is determined when batchFinished() is called.

Parameters:

instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).

Returns:

true if the outputFormat may be collected immediately

outputFormat

public Instances outputFormat()
                       throws Exception

Gets the format of the output instances. This should only be called after input() or batchFinished() has returned true.

Specified by:

outputFormat in interface InstanceProducer

Returns:

an Instances object containing the output instance structure only.

Throws:

Exception - if no input structure has been defined (or the output format hasn't been determined yet)

input

public boolean input(Instance instance)
              throws Exception

Throws:

Exception

batchFinished

public void batchFinished()
                   throws Exception

Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances. Any subsequent instances filtered should be filtered based on setting obtained from the first batch (unless the inputFormat has been re-assigned or new options have been set). This default implementation assumes all instance processing occurs during inputFormat() and input().

Throws:

Exception - if no input structure has been defined

outputPeek

public Instance outputPeek()
                    throws Exception

Output an instance after filtering but do not remove from the output queue.

Specified by:

outputPeek in interface InstanceProducer

Returns:

the instance that has most recently been filtered (or null if the queue is empty).

Throws:

Exception - if no input structure has been defined

setDebug

public void setDebug(boolean debug)

getDebug

public boolean getDebug()

addInstanceListener

public void addInstanceListener(InstanceListener ipl)

Specified by:

addInstanceListener in interface InstanceProducer

removeInstanceListener

public void removeInstanceListener(InstanceListener ipl)

Specified by:

removeInstanceListener in interface InstanceProducer

instanceProduced

public void instanceProduced(InstanceEvent e)

secondInstanceProduced

public void secondInstanceProduced(InstanceEvent e)

Specified by:

secondInstanceProduced in interface SerialInstanceListener