Package org.apache.lucene.search.matchhighlight

Class MatchRegionRetriever

java.lang.Object

org.apache.lucene.search.matchhighlight.MatchRegionRetriever

public class MatchRegionRetriever
extends Object

Utility class to compute a list of "match regions" for a given query, searcher and document(s) using Matches API.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	MatchRegionRetriever.FieldValueProvider	An abstraction that provides document values for a given field.
static interface	MatchRegionRetriever.MatchOffsetsConsumer	A callback for accepting a single document (and its associated leaf reader, leaf document ID) and its match offset ranges, as indicated by the Matches interface retrieved for the query.

Constructor Summary

Constructors

Constructor	Description
MatchRegionRetriever(IndexSearcher searcher, Query query, Analyzer analyzer)	A constructor with the default offset strategy supplier.
MatchRegionRetriever(IndexSearcher searcher, Query query, OffsetsRetrievalStrategySupplier fieldOffsetStrategySupplier)

Method Summary

Modifier and Type	Method	Description
static OffsetsRetrievalStrategySupplier	computeOffsetRetrievalStrategies(IndexReader reader, Analyzer analyzer)	Compute default strategies for retrieving offsets from MatchesIterator instances for a set of given fields.
void	highlightDocument(LeafReaderContext leafReaderContext, int contextDocId, MatchRegionRetriever.FieldValueProvider doc, Predicate<String> acceptField, Map<String,List<OffsetRange>> outputHighlights)	Low-level method for retrieving hit ranges for a single document.
void	highlightDocuments(PrimitiveIterator.OfInt docIds, MatchRegionRetriever.MatchOffsetsConsumer consumer)	Low-level, high-efficiency method for highlighting large numbers of documents at once in a streaming fashion.
void	highlightDocuments(TopDocs topDocs, MatchRegionRetriever.MatchOffsetsConsumer consumer)

Methods inherited from class java.lang.Object

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

Constructor Detail

MatchRegionRetriever

public MatchRegionRetriever(IndexSearcher searcher,
                            Query query,
                            Analyzer analyzer)
                     throws IOException

A constructor with the default offset strategy supplier.

Parameters:

analyzer - An analyzer that may be used to reprocess (retokenize) document fields in the absence of position offsets in the index. Note that the analyzer must return tokens (positions and offsets) identical to the ones stored in the index.

Throws:

IOException

MatchRegionRetriever

public MatchRegionRetriever(IndexSearcher searcher,
                            Query query,
                            OffsetsRetrievalStrategySupplier fieldOffsetStrategySupplier)
                     throws IOException

Parameters:

searcher - Index searcher to be used for retrieving matches.

query - The query for which matches should be retrieved. The query should be rewritten against the provided searcher.

fieldOffsetStrategySupplier - A custom supplier of per-field OffsetsRetrievalStrategy instances.

Throws:

IOException

Method Detail

highlightDocuments

public void highlightDocuments(TopDocs topDocs,
                               MatchRegionRetriever.MatchOffsetsConsumer consumer)
                        throws IOException

Throws:

IOException

highlightDocuments

public void highlightDocuments(PrimitiveIterator.OfInt docIds,
                               MatchRegionRetriever.MatchOffsetsConsumer consumer)
                        throws IOException

Low-level, high-efficiency method for highlighting large numbers of documents at once in a streaming fashion.

Parameters:

docIds - A stream of sorted document identifiers for which hit ranges should be returned.

consumer - A streaming consumer for document-hits pairs.

Throws:

IOException

highlightDocument

public void highlightDocument(LeafReaderContext leafReaderContext,
                              int contextDocId,
                              MatchRegionRetriever.FieldValueProvider doc,
                              Predicate<String> acceptField,
                              Map<String,List<OffsetRange>> outputHighlights)
                       throws IOException

Low-level method for retrieving hit ranges for a single document. This method can be used with custom document MatchRegionRetriever.FieldValueProvider.

Throws:

IOException

computeOffsetRetrievalStrategies

public static OffsetsRetrievalStrategySupplier computeOffsetRetrievalStrategies(IndexReader reader,
                                                                                Analyzer analyzer)

Compute default strategies for retrieving offsets from MatchesIterator instances for a set of given fields.