org.apache.lucene.search
Class FilteredQuery.FilterStrategy

java.lang.Object
  org.apache.lucene.search.FilteredQuery.FilterStrategy

Direct Known Subclasses:

FilteredQuery.RandomAccessFilterStrategy

Enclosing class:

FilteredQuery

public abstract static class FilteredQuery.FilterStrategy
extends Object

Abstract class that defines how the filter (DocIdSet) applied during document collection.

Constructor Summary

FilteredQuery.FilterStrategy()

Method Summary

abstract Scorer

filteredScorer(AtomicReaderContext context, boolean scoreDocsInOrder, boolean topScorer, Weight weight, DocIdSet docIdSet) Returns a filtered Scorer based on this strategy.

Methods inherited from class java.lang.Object

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

Constructor Detail

FilteredQuery.FilterStrategy

public FilteredQuery.FilterStrategy()

Method Detail

filteredScorer

public abstract Scorer filteredScorer(AtomicReaderContext context,
                                      boolean scoreDocsInOrder,
                                      boolean topScorer,
                                      Weight weight,
                                      DocIdSet docIdSet)
                               throws IOException

Returns a filtered Scorer based on this strategy.

Parameters:

context - the AtomicReaderContext for which to return the Scorer.

scoreDocsInOrder - specifies whether in-order scoring of documents is required. Note that if set to false (i.e., out-of-order scoring is required), this method can return whatever scoring mode it supports, as every in-order scorer is also an out-of-order one. However, an out-of-order scorer may not support DocIdSetIterator.nextDoc() and/or DocIdSetIterator.advance(int), therefore it is recommended to request an in-order scorer if use of these methods is required.

topScorer - if true, Scorer.score(Collector) will be called; if false, DocIdSetIterator.nextDoc() and/or DocIdSetIterator.advance(int) will be called.

weight - the FilteredQuery Weight to create the filtered scorer.

docIdSet - the filter DocIdSet to apply

Returns:

a filtered scorer

Throws:

IOException - if an IOException occurs