Package org.apache.lucene.sandbox.facet.utils

Class PostCollectionFaceting<C extends Collector,T,K extends Collector,R>

java.lang.Object

org.apache.lucene.sandbox.facet.utils.PostCollectionFaceting<C,T,K,R>

Type Parameters:

C - drill-down collector type

T - drill-down result type

K - drill-sideways collector type

R - drill-sideways result type

public final class PostCollectionFaceting<C extends Collector,T,K extends Collector,R>
extends Object

Performs post-collection faceting by replaying collected documents through drill-down and drill-sideways collectors. This enables parallel facet computation after initial document collection.

Normally, users can collect facets directly during search without needing FacetsCollector to store doc IDs. However, this class implements the second step of two-step collection: iterating over doc IDs already collected in FacetsCollector to compute facet results. This approach is useful when all matches must be known before computing facets, or when reusing the same matching documents to run faceting multiple times.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	PostCollectionFaceting.Result<T,R>	The result.

Constructor Summary

Constructors

Constructor	Description
PostCollectionFaceting(CollectorManager<C,T> drillDownCollectorManager, Map<String,? extends CollectorManager<K,R>> drillSidewaysCollectorManagers, FacetsCollector drillDownFacetsCollector, Map<String,FacetsCollector> drillSidewaysFacetsCollectors, Executor executor)	Creates a new PostCollectionFaceting instance.
PostCollectionFaceting(CollectorManager<C,T> drillDownCollectorManager, FacetsCollector drillDownFacetsCollector, Executor executor)	Creates a new PostCollectionFaceting instance without drill-sideways collectors.

Method Summary

Modifier and Type	Method	Description
PostCollectionFaceting.Result<T,R>	collect()	Collects facet results by replaying documents through collectors in parallel slices.

Methods inherited from class java.lang.Object

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

Constructor Details

PostCollectionFaceting

public PostCollectionFaceting(CollectorManager<C,T> drillDownCollectorManager,
 Map<String,? extends CollectorManager<K,R>> drillSidewaysCollectorManagers,
 FacetsCollector drillDownFacetsCollector,
 Map<String,FacetsCollector> drillSidewaysFacetsCollectors,
 Executor executor)

Creates a new PostCollectionFaceting instance.

Parameters:

drillDownCollectorManager - collector manager for drill-down results

drillSidewaysCollectorManagers - map of dimension names to collector managers for drill-sideways results

drillDownFacetsCollector - facets collector containing drill-down matching documents

drillSidewaysFacetsCollectors - map of dimension names to facets collectors for drill-sideways

executor - executor for parallel processing, or null for sequential execution

PostCollectionFaceting

public PostCollectionFaceting(CollectorManager<C,T> drillDownCollectorManager,
 FacetsCollector drillDownFacetsCollector,
 Executor executor)

Creates a new PostCollectionFaceting instance without drill-sideways collectors.

Parameters:

drillDownCollectorManager - collector manager for drill-down results

drillDownFacetsCollector - facets collector containing drill-down matching documents

executor - executor for parallel processing, or null for sequential execution

Method Details

collect

public PostCollectionFaceting.Result<T,R> collect()
                                           throws IOException

Collects facet results by replaying documents through collectors in parallel slices.

Returns:

result containing drill-down and drill-sideways facet results

Throws:

IOException - if an I/O error occurs during collection