Package weka.knowledgeflow.steps

Class MemoryBasedDataSource

java.lang.Object

weka.knowledgeflow.steps.BaseStep

weka.knowledgeflow.steps.MemoryBasedDataSource

All Implemented Interfaces:

Serializable, BaseStepExtender, Step

@KFStep(name="MemoryDataSource",
        category="DataSources",
        toolTipText="Memory-based data",
        iconPath="weka/gui/knowledgeflow/icons/DefaultDataSource.gif")
public class MemoryBasedDataSource
extends BaseStep

Simple start step that stores a set of instances and outputs it in a dataSet connection. Gets used programmatically when the setInstances() method is invoked on the MainKFPerspective in order to create a new Flow containing this step.

Version:

$Revision: $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
MemoryBasedDataSource()

Method Summary

Modifier and Type	Method	Description
List<String>	getIncomingConnectionTypes()	Get a list of incoming connection types that this step can accept.
Instances	getInstances()	Get the data to output from this step
List<String>	getOutgoingConnectionTypes()	Get a list of outgoing connection types that this step can produce.
void	setInstances(Instances instances)	Set the data to output from this step
void	start()	Start processing
void	stepInit()	Initialize the step

Methods inherited from class weka.knowledgeflow.steps.BaseStep

environmentSubstitute, getCustomEditorForStep, getDefaultSettings, getInteractiveViewers, getInteractiveViewersImpls, getName, getStepManager, globalInfo, isResourceIntensive, isStopRequested, outputStructureForConnectionType, outputStructureForConnectionType, processIncoming, setName, setStepIsResourceIntensive, setStepManager, setStepMustRunSingleThreaded, stepMustRunSingleThreaded, stop

Methods inherited from class java.lang.Object

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

Constructor Details

MemoryBasedDataSource

public MemoryBasedDataSource()

Method Details

setInstances

public void setInstances(Instances instances)

Set the data to output from this step

Parameters:

instances -

getInstances

public Instances getInstances()

Get the data to output from this step

Returns:

stepInit

public void stepInit()
              throws WekaException

Initialize the step

Throws:

WekaException - if the data to output has not been set yet

getIncomingConnectionTypes

public List<String> getIncomingConnectionTypes()

Get a list of incoming connection types that this step can accept. Ideally (and if appropriate), this should take into account the state of the step and any existing incoming connections. E.g. a step might be able to accept one (and only one) incoming batch data connection.

Returns:

a list of incoming connections that this step can accept given its current state

getOutgoingConnectionTypes

public List<String> getOutgoingConnectionTypes()

Get a list of outgoing connection types that this step can produce. Ideally (and if appropriate), this should take into account the state of the step and the incoming connections. E.g. depending on what incoming connection is present, a step might be able to produce a trainingSet output, a testSet output or neither, but not both.

Returns:

a list of outgoing connections that this step can produce

start

public void start()
           throws WekaException

Start processing

Specified by:

start in interface BaseStepExtender

Specified by:

start in interface Step

Overrides:

start in class BaseStep

Throws:

WekaException - if a problem occurs