## Uses of Class
org.apache.lucene.index.IndexReader

Packages that use IndexReader
org.apache.lucene.index: Code to maintain and access indices.
org.apache.lucene.search: Code to search indices.
org.apache.lucene.search.spans: The calculus of spans.

Uses of IndexReader in org.apache.lucene.index

Classes in org.apache.lucene.index with type parameters of type IndexReader
`class` `BaseCompositeReader<R extends IndexReader>` Base class for implementing `CompositeReader`s based on an array of sub-readers.

Subclasses of IndexReader in org.apache.lucene.index
`class` `AtomicReader` `AtomicReader` is an abstract class, providing an interface for accessing an index.
`class` `BaseCompositeReader<R extends IndexReader>` Base class for implementing `CompositeReader`s based on an array of sub-readers.
`class` `CompositeReader` Instances of this reader type can only be used to get stored fields from the underlying AtomicReaders, but it is not possible to directly retrieve postings.
`class` `DirectoryReader` DirectoryReader is an implementation of `CompositeReader` that can read indexes in a `Directory`.
`class` `FilterAtomicReader` A `FilterAtomicReader` contains another AtomicReader, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
`class` `FilterDirectoryReader` A FilterDirectoryReader wraps another DirectoryReader, allowing implementations to transform or extend it.
`class` `MultiReader` A `CompositeReader` which reads multiple indexes, appending their content.
`class` `ParallelAtomicReader` An `AtomicReader` which reads multiple, parallel indexes.
`class` `ParallelCompositeReader` An `CompositeReader` which reads multiple, parallel indexes.
`class` `SegmentReader` IndexReader implementation over a single segment.
`class` `SlowCompositeReaderWrapper` This class forces a composite reader (eg a `MultiReader` or `DirectoryReader`) to emulate an atomic reader.

Methods in org.apache.lucene.index that return IndexReader
`abstract IndexReader` `IndexReaderContext.reader()` Returns the `IndexReader`, this context represents.

Methods in org.apache.lucene.index that return types with arguments of type IndexReader
`protected abstract List<? extends IndexReader>` `CompositeReader.getSequentialSubReaders()` Expert: returns the sequential sub readers that this reader is logically composed of.

Methods in org.apache.lucene.index with parameters of type IndexReader
`void` `IndexWriter.addIndexes(IndexReader... readers)` Merges the provided indexes into this index.
`static BinaryDocValues` `MultiDocValues.getBinaryValues(IndexReader r, String field)` Returns a BinaryDocValues for a reader's docvalues (potentially merging on-the-fly)
`static Fields` `MultiFields.getFields(IndexReader reader)` Returns a single `Fields` instance for this reader, merging fields/terms/docs/positions on the fly.
`static Collection<String>` `MultiFields.getIndexedFields(IndexReader reader)` Call this to get the (merged) FieldInfos representing the set of indexed fields only for a composite reader.
`static Bits` `MultiFields.getLiveDocs(IndexReader reader)` Returns a single `Bits` instance for this reader, merging live Documents on the fly.
`static FieldInfos` `MultiFields.getMergedFieldInfos(IndexReader reader)` Call this to get the (merged) FieldInfos for a composite reader.
`static NumericDocValues` `MultiDocValues.getNormValues(IndexReader r, String field)` Returns a NumericDocValues for a reader's norms (potentially merging on-the-fly).
`static NumericDocValues` `MultiDocValues.getNumericValues(IndexReader r, String field)` Returns a NumericDocValues for a reader's docvalues (potentially merging on-the-fly)
`static SortedSetDocValues` `MultiDocValues.getSortedSetValues(IndexReader r, String field)` Returns a SortedSetDocValues for a reader's docvalues (potentially doing extremely slow things).
`static SortedDocValues` `MultiDocValues.getSortedValues(IndexReader r, String field)` Returns a SortedDocValues for a reader's docvalues (potentially doing extremely slow things).
`static DocsEnum` `MultiFields.getTermDocsEnum(IndexReader r, Bits liveDocs, String field, BytesRef term)` Returns `DocsEnum` for the specified field & term.
`static DocsEnum` `MultiFields.getTermDocsEnum(IndexReader r, Bits liveDocs, String field, BytesRef term, int flags)` Returns `DocsEnum` for the specified field & term, with control over whether freqs are required.
`static DocsAndPositionsEnum` `MultiFields.getTermPositionsEnum(IndexReader r, Bits liveDocs, String field, BytesRef term)` Returns `DocsAndPositionsEnum` for the specified field & term.
`static DocsAndPositionsEnum` `MultiFields.getTermPositionsEnum(IndexReader r, Bits liveDocs, String field, BytesRef term, int flags)` Returns `DocsAndPositionsEnum` for the specified field & term, with control over whether offsets and payloads are required.
`static Terms` `MultiFields.getTerms(IndexReader r, String field)` This method may return null if the field does not exist.
`void` `IndexReader.ReaderClosedListener.onClose(IndexReader reader)` Invoked when the `IndexReader` is closed.
`void` `IndexReader.registerParentReader(IndexReader reader)` Expert: This method is called by `IndexReader`s which wrap other readers (e.g.
`boolean` `IndexWriter.tryDeleteDocument(IndexReader readerIn, int docID)` Expert: attempts to delete by document ID, as long as the provided reader is a near-real-time reader (from `DirectoryReader.open(IndexWriter,boolean)`).
`static AtomicReader` `SlowCompositeReaderWrapper.wrap(IndexReader reader)` This method is sugar for getting an `AtomicReader` from an `IndexReader` of any kind.

Constructors in org.apache.lucene.index with parameters of type IndexReader
`BaseCompositeReader(R[] subReaders)` Constructs a `BaseCompositeReader` on the given subReaders.
`MultiReader(IndexReader... subReaders)` Construct a MultiReader aggregating the named set of (sub)readers.
`MultiReader(IndexReader[] subReaders, boolean closeSubReaders)` Construct a MultiReader aggregating the named set of (sub)readers.

Uses of IndexReader in org.apache.lucene.search

Methods in org.apache.lucene.search that return IndexReader
`IndexReader` `IndexSearcher.getIndexReader()` Return the `IndexReader` this searches.

Methods in org.apache.lucene.search with parameters of type IndexReader
`long` `NRTManager.TrackingIndexWriter.addIndexes(IndexReader... readers)`
`static IndexSearcher` `SearcherManager.getSearcher(SearcherFactory searcherFactory, IndexReader reader)` Expert: creates a searcher from the provided `IndexReader` using the provided `SearcherFactory`.
`IndexSearcher` `SearcherFactory.newSearcher(IndexReader reader)` Returns a new IndexSearcher over the given reader.
`Query` `Query.rewrite(IndexReader reader)` Expert: called to re-write queries into primitive queries.
`Query` `PhraseQuery.rewrite(IndexReader reader)`
`Query` `NGramPhraseQuery.rewrite(IndexReader reader)`
`Query` `MultiTermQuery.rewrite(IndexReader reader)` To rewrite to a simpler form, instead return a simpler enum from `MultiTermQuery.getTermsEnum(Terms, AttributeSource)`.
`Query` `MultiPhraseQuery.rewrite(IndexReader reader)`
`Query` `FilteredQuery.rewrite(IndexReader reader)` Rewrites the query.
`Query` `DisjunctionMaxQuery.rewrite(IndexReader reader)` Optimize our representation and our subqueries representations
`Query` `ConstantScoreQuery.rewrite(IndexReader reader)`
`Query` `BooleanQuery.rewrite(IndexReader reader)`
`Q` `TopTermsRewrite.rewrite(IndexReader reader, MultiTermQuery query)`
`Q` `ScoringRewrite.rewrite(IndexReader reader, MultiTermQuery query)`
`abstract Query` `MultiTermQuery.RewriteMethod.rewrite(IndexReader reader, MultiTermQuery query)`
`Query` `FieldCacheRewriteMethod.rewrite(IndexReader reader, MultiTermQuery query)`
`Query` `DocTermOrdsRewriteMethod.rewrite(IndexReader reader, MultiTermQuery query)`
`long` `NRTManager.TrackingIndexWriter.tryDeleteDocument(IndexReader reader, int docID)`

Constructors in org.apache.lucene.search with parameters of type IndexReader
`IndexSearcher(IndexReader r)` Creates a searcher searching the provided index.
`IndexSearcher(IndexReader r, ExecutorService executor)` Runs searches for each segment separately, using the provided ExecutorService.

Uses of IndexReader in org.apache.lucene.search.spans

Methods in org.apache.lucene.search.spans with parameters of type IndexReader
`Query` `SpanPositionCheckQuery.rewrite(IndexReader reader)`
`Query` `SpanOrQuery.rewrite(IndexReader reader)`
`Query` `SpanNotQuery.rewrite(IndexReader reader)`
`Query` `SpanNearQuery.rewrite(IndexReader reader)`
`Query` `SpanMultiTermQueryWrapper.rewrite(IndexReader reader)`
`Query` `FieldMaskingSpanQuery.rewrite(IndexReader reader)`
`abstract SpanQuery` `SpanMultiTermQueryWrapper.SpanRewriteMethod.rewrite(IndexReader reader, MultiTermQuery query)`
`SpanQuery` `SpanMultiTermQueryWrapper.TopTermsSpanBooleanQueryRewrite.rewrite(IndexReader reader, MultiTermQuery query)`

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