org.apache.lucene.facet.index.streaming

Class CategoryParentsStream

java.lang.Object

org.apache.lucene.util.AttributeSource

org.apache.lucene.analysis.TokenStream

org.apache.lucene.analysis.TokenFilter

org.apache.lucene.facet.index.streaming.CategoryParentsStream

All Implemented Interfaces:

Closeable

public class CategoryParentsStream
extends TokenFilter

This class adds parents to a CategoryAttributesStream. The parents are added according to the PathPolicy and OrdinalPolicy from the FacetIndexingParams given in the constructor.
By default, category properties are removed when creating parents of a certain category. However, it is possible to retain certain property types using addRetainableProperty(Class).

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

AttributeSource.AttributeFactory, AttributeSource.State

Field Summary

Fields

Modifier and Type	Field and Description
protected CategoryAttribute	categoryAttribute An attribute containing all data related to the category
protected OrdinalProperty	ordinalProperty A category property containing the category ordinal
protected TaxonomyWriter	taxonomyWriter A TaxonomyWriter for adding categories and retrieving their ordinals.

Fields inherited from class org.apache.lucene.analysis.TokenFilter

input

Constructor Summary

Constructors

Constructor and Description
CategoryParentsStream(CategoryAttributesStream input, TaxonomyWriter taxonomyWriter, FacetIndexingParams indexingParams) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	addRetainableProperty(Class<? extends CategoryProperty> toRetain) Add a CategoryProperty class which is retained when creating parent tokens.
protected void	clearCategoryProperties() Clear the properties of the current CategoryAttribute attribute before setting the parent attributes.
boolean	incrementToken()

Methods inherited from class org.apache.lucene.analysis.TokenFilter

close, end, reset

Methods inherited from class org.apache.lucene.util.AttributeSource

addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState

Methods inherited from class java.lang.Object

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

Field Detail

taxonomyWriter

protected TaxonomyWriter taxonomyWriter

A TaxonomyWriter for adding categories and retrieving their ordinals.

categoryAttribute

protected CategoryAttribute categoryAttribute

An attribute containing all data related to the category

ordinalProperty

protected OrdinalProperty ordinalProperty

A category property containing the category ordinal

Constructor Detail

CategoryParentsStream

public CategoryParentsStream(CategoryAttributesStream input,
                     TaxonomyWriter taxonomyWriter,
                     FacetIndexingParams indexingParams)

Constructor.

Parameters:

input - The input stream to handle, must be derived from CategoryAttributesStream.

taxonomyWriter - The taxonomy writer to use for adding categories and retrieving their ordinals.

indexingParams - The indexing params used for filtering parents.

Method Detail

incrementToken

public final boolean incrementToken()
                             throws IOException

Specified by:

incrementToken in class TokenStream

Throws:

IOException

clearCategoryProperties

protected void clearCategoryProperties()

Clear the properties of the current CategoryAttribute attribute before setting the parent attributes.
It is possible to retain properties of certain types the parent tokens, using addRetainableProperty(Class).

addRetainableProperty

public void addRetainableProperty(Class<? extends CategoryProperty> toRetain)

Add a CategoryProperty class which is retained when creating parent tokens.

Parameters:

toRetain - The property class to retain.