Package elki.datasource.filter.transform

Class ProjectionFilter<I,O>

java.lang.Object

elki.datasource.filter.AbstractStreamFilter

elki.datasource.filter.AbstractStreamConversionFilter<I,O>

elki.datasource.filter.transform.ProjectionFilter<I,O>

Type Parameters:

I - Input type

O - Output type

All Implemented Interfaces:

BundleStreamSource, ObjectFilter, StreamFilter

public class ProjectionFilter<I,O>
extends AbstractStreamConversionFilter<I,O>

Apply a projection to the data.

Since:

0.6.0

Author:

Erich Schubert

Nested Class Summary

Nested classes/interfaces inherited from interface elki.datasource.bundle.BundleStreamSource

BundleStreamSource.Event

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Projection<I,O>	projection	Projection to apply.

Fields inherited from class elki.datasource.filter.AbstractStreamFilter

source

Constructor Summary

Constructors

Constructor	Description
ProjectionFilter(Projection<I,O> projection)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected SimpleTypeInformation<? super O>	convertedType(SimpleTypeInformation<I> in)	Get the output type from the input type after conversion.
protected O	filterSingleObject(I obj)	Normalize a single instance.
protected TypeInformation	getInputTypeRestriction()	Get the input type restriction used for negotiating the data query.

Methods inherited from class elki.datasource.filter.AbstractStreamConversionFilter

data, getMeta, nextEvent

Methods inherited from class elki.datasource.filter.AbstractStreamFilter

asMultipleObjectsBundle, assignDBID, filter, hasDBIDs, init, toString

Methods inherited from class java.lang.Object

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

Field Detail

projection

Projection<I,O> projection

Projection to apply.

Constructor Detail

ProjectionFilter

public ProjectionFilter(Projection<I,O> projection)

Constructor.

Parameters:

projection - Projection

Method Detail

filterSingleObject

protected O filterSingleObject(I obj)

Description copied from class: AbstractStreamConversionFilter

Normalize a single instance. You can implement this as UnsupportedOperationException if you override both public "normalize" functions!

Specified by:

filterSingleObject in class AbstractStreamConversionFilter<I,O>

Parameters:

obj - Database object to normalize

Returns:

Normalized database object

getInputTypeRestriction

protected TypeInformation getInputTypeRestriction()

Description copied from class: AbstractStreamConversionFilter

Get the input type restriction used for negotiating the data query.

Specified by:

getInputTypeRestriction in class AbstractStreamConversionFilter<I,O>

Returns:

Type restriction

convertedType

protected SimpleTypeInformation<? super O> convertedType(SimpleTypeInformation<I> in)

Description copied from class: AbstractStreamConversionFilter

Get the output type from the input type after conversion.

Specified by:

convertedType in class AbstractStreamConversionFilter<I,O>

Parameters:

in - input type restriction

Returns:

output type restriction