Package weka.knowledgeflow.steps

Class Appender

java.lang.Object

weka.knowledgeflow.steps.BaseStep

weka.knowledgeflow.steps.Appender

All Implemented Interfaces:

Serializable, BaseStepExtender, Step

@KFStep(name="Appender",
        category="Flow",
        toolTipText="Append multiple sets of instances",
        iconPath="weka/gui/knowledgeflow/icons/Appender.png")
public class Appender
extends BaseStep

A bean that appends multiple incoming data connections into a single data set. The incoming connections can be either all instance connections or all batch-oriented connections (i.e. data set, training set and test set). Instance and batch connections can't be mixed. An amalgamated output is created that is a combination of all the incoming attributes. Missing values are used to fill columns that don't exist in a particular incoming data set. If all incoming connections are instance connections, then the outgoing connection must be an instance connection (and vice versa for incoming batch connections).

Version:

$Revision: $

Author:

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

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Appender()

Method Summary

Modifier and Type	Method	Description
List<String>	getIncomingConnectionTypes()	Get the incoming connection types accepted by this step at this time
List<String>	getOutgoingConnectionTypes()	Get a list of outgoing connection types that this step can produce at this time
Instances	outputStructureForConnectionType(String connectionName)	If possible, get the output structure for the named connection type as a header-only set of instances.
void	processIncoming(Data data)	Process an incoming data payload (if the step accepts incoming connections)
void	stepInit()	Initialize the step

Methods inherited from class weka.knowledgeflow.steps.BaseStep

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

Methods inherited from class java.lang.Object

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

Constructor Details

Appender

public Appender()

Method Details

stepInit

public void stepInit()
              throws WekaException

Initialize the step

Throws:

WekaException - if a problem occurs

getIncomingConnectionTypes

public List<String> getIncomingConnectionTypes()

Get the incoming connection types accepted by this step at this time

Returns:

a list of incoming connection types

getOutgoingConnectionTypes

public List<String> getOutgoingConnectionTypes()

Get a list of outgoing connection types that this step can produce at this time

Returns:

a list of outgoing connection types

processIncoming

public void processIncoming(Data data)
                     throws WekaException

Process an incoming data payload (if the step accepts incoming connections)

Specified by:

processIncoming in interface BaseStepExtender

Specified by:

processIncoming in interface Step

Overrides:

processIncoming in class BaseStep

Parameters:

data - the data to process

Throws:

WekaException - if a problem occurs

outputStructureForConnectionType

public Instances outputStructureForConnectionType(String connectionName)
                                           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 to get the output structure for

Returns:

the output structure or null if it can't be produced

Throws:

WekaException - if a problem occurs