Package weka.knowledgeflow.steps

Class Loader

java.lang.Object

weka.knowledgeflow.steps.BaseStep

weka.knowledgeflow.steps.WekaAlgorithmWrapper

weka.knowledgeflow.steps.Loader

All Implemented Interfaces:

Serializable, BaseStepExtender, Step

@KFStep(name="Loader",
        category="DataSources",
        toolTipText="Weka loader wrapper",
        iconPath="")
public class Loader
extends WekaAlgorithmWrapper
implements Serializable

Knowledge Flow step that wraps weka.core.converters.Loaders.

Version:

$Revision: $

Author:

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

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Loader()

Method Summary

Modifier and Type	Method	Description
String	getCustomEditorForStep()	Return the fully qualified name of a custom editor component (JComponent) to use for editing the properties of the step.
List<String>	getIncomingConnectionTypes()	Get a list of incoming connection types that this step can accept.
Loader	getLoader()	Convenience method - calls getWrappedAlgorithm()
List<String>	getOutgoingConnectionTypes()	Get a list of outgoing connection types that this step can produce.
Class	getWrappedAlgorithmClass()	Get the class of the wrapped algorithm
Instances	outputStructureForConnectionType(String connectionName, Environment env)	If possible, get the output structure for the named connection type as a header-only set of instances.
void	setLoader(Loader loader)	Convenience method - calls setWrappedAlgorithm()
void	setWrappedAlgorithm(Object algo)	Set the wrapped algorithm to use
void	start()	Start executing
void	stepInit()	Initialize the step.

Methods inherited from class weka.knowledgeflow.steps.WekaAlgorithmWrapper

getDefaultIconPath, getDefaultPackageLevelIconPath, getIconPath, getWrappedAlgorithm, globalInfo

Methods inherited from class weka.knowledgeflow.steps.BaseStep

environmentSubstitute, getDefaultSettings, getInteractiveViewers, getInteractiveViewersImpls, getName, getStepManager, isResourceIntensive, isStopRequested, 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

Loader

public Loader()

Method Details

getWrappedAlgorithmClass

public Class getWrappedAlgorithmClass()

Get the class of the wrapped algorithm

Specified by:

getWrappedAlgorithmClass in class WekaAlgorithmWrapper

Returns:

the class of the wrapped algorithm

setWrappedAlgorithm

public void setWrappedAlgorithm(Object algo)

Set the wrapped algorithm to use

Overrides:

setWrappedAlgorithm in class WekaAlgorithmWrapper

Parameters:

algo - the algorithm to use

getLoader

public Loader getLoader()

Convenience method - calls getWrappedAlgorithm()

Returns:

the wrapped loader

setLoader

@ProgrammaticProperty
public void setLoader(Loader loader)

Convenience method - calls setWrappedAlgorithm()

Parameters:

loader - the loader to use

stepInit

public void stepInit()
              throws WekaException

Initialize the step.

Specified by:

stepInit in interface BaseStepExtender

Specified by:

stepInit in interface Step

Throws:

WekaException - if a problem occurs during initialization

start

public void start()
           throws WekaException

Start executing

Specified by:

start in interface BaseStepExtender

Specified by:

start in interface Step

Overrides:

start in class BaseStep

Throws:

WekaException - if a problem occurs

outputStructureForConnectionType

public Instances outputStructureForConnectionType(String connectionName,
 Environment env)
                                           throws WekaException

If possible, get the output structure for the named connection type as a header-only set of instances. Can return null if the specified connection type is not representable as Instances or cannot be determined at present.

Specified by:

outputStructureForConnectionType in interface Step

Overrides:

outputStructureForConnectionType in class BaseStep

Parameters:

connectionName - the name of the connection type to get the output structure for

env - Environment to use

Returns:

the output structure as a header-only Instances object

Throws:

WekaException - if a problem occurs

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.

Specified by:

getIncomingConnectionTypes in interface BaseStepExtender

Specified by:

getIncomingConnectionTypes in interface Step

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.

Specified by:

getOutgoingConnectionTypes in interface BaseStepExtender

Specified by:

getOutgoingConnectionTypes in interface Step

Returns:

a list of outgoing connections that this step can produce

getCustomEditorForStep

public String getCustomEditorForStep()

Return the fully qualified name of a custom editor component (JComponent) to use for editing the properties of the step. This method can return null, in which case the system will dynamically generate an editor using the GenericObjectEditor

Specified by:

getCustomEditorForStep in interface Step

Overrides:

getCustomEditorForStep in class BaseStep

Returns:

the fully qualified name of a step editor component