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