weka.knowledgeflow.steps

Class SubstringReplacer

java.lang.Object

weka.knowledgeflow.steps.BaseStep

weka.knowledgeflow.steps.SubstringReplacer

All Implemented Interfaces:

java.io.Serializable, BaseStepExtender, Step

@KFStep(name="SubstringReplacer",
        category="Tools",
        toolTipText="Replace substrings in String attribute values using either literal match-and-replace or regular expression matching. The attributes to apply the match and replace rules to can be selected via a range string (e.g. 1-5,6-last) or by a comma-separated list of attribute names (/first and /last can be used to indicate the first and last attribute respectively)",
        iconPath="weka/gui/knowledgeflow/icons/DefaultFilter.gif")
public class SubstringReplacer
extends BaseStep

A step that can replace sub-strings in the values of string attributes. Only operates in streaming mode. Multiple match and replace "rules" can be specified - these get applied in the order that they are defined. Each rule can be applied to one or more user-specified input String attributes. Attributes can be specified using either a range list (e.g 1,2-10,last) or by a comma separated list of attribute names (where "/first" and "/last" are special strings indicating the first and last attribute respectively).

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	m_isReset Step has been reset - i.e. start of processing
protected java.lang.String	m_matchReplaceDetails Internally encoded list of match-replace rules
protected SubstringReplacerRules	m_mr Handles the rules for replacement
protected Data	m_streamingData Reusable data object for output

Fields inherited from class weka.knowledgeflow.steps.BaseStep

m_stepIsResourceIntensive, m_stepManager, m_stepName

Constructor Summary

Constructors

Constructor and Description
SubstringReplacer()

Method Summary

Modifier and Type	Method and Description
java.lang.String	getCustomEditorForStep() Return the fully qualified name of a custom editor component (JComponent) to use for editing the properties of the step.
java.util.List<java.lang.String>	getIncomingConnectionTypes() Get a list of incoming connection types that this step can accept.
java.lang.String	getMatchReplaceDetails() Get the internally encoded list of match-replace rules
java.util.List<java.lang.String>	getOutgoingConnectionTypes() Get a list of outgoing connection types that this step can produce.
Instances	outputStructureForConnectionType(java.lang.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	setMatchReplaceDetails(java.lang.String details) Set internally encoded list of match-replace rules
void	stepInit() Initialize the step

Methods inherited from class weka.knowledgeflow.steps.BaseStep

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

Methods inherited from class java.lang.Object

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

Field Detail

m_matchReplaceDetails

protected java.lang.String m_matchReplaceDetails

Internally encoded list of match-replace rules

m_mr

protected transient SubstringReplacerRules m_mr

Handles the rules for replacement

m_streamingData

protected Data m_streamingData

Reusable data object for output

m_isReset

protected boolean m_isReset

Step has been reset - i.e. start of processing

Constructor Detail

SubstringReplacer

public SubstringReplacer()

Method Detail

setMatchReplaceDetails

@ProgrammaticProperty
public void setMatchReplaceDetails(java.lang.String details)

Set internally encoded list of match-replace rules

Parameters:

details - the list of match-replace rules

getMatchReplaceDetails

public java.lang.String getMatchReplaceDetails()

Get the internally encoded list of match-replace rules

Returns:

the match-replace rules

stepInit

public void stepInit()
              throws WekaException

Initialize the step

Throws:

WekaException - if a problem occurs

getIncomingConnectionTypes

public java.util.List<java.lang.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 java.util.List<java.lang.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

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(java.lang.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 type to get the output structure for

Returns:

the output structure as a header-only Instances object

Throws:

WekaException - if a problem occurs

getCustomEditorForStep

public java.lang.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