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

- Packages that use IndexReader
  Package | Description
  --- | ---
  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
    Modifier and Type | Class and Description
    --- | ---
    `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
    Modifier and Type | Class and Description
    --- | ---
    `class` | `BaseCompositeReader<R extends IndexReader>` Base class for implementing `CompositeReader`s based on an array of sub-readers.
    `class` | `CodecReader` LeafReader implemented by codec APIs.
    `class` | `CompositeReader` Instances of this reader type can only be used to get stored fields from the underlying LeafReaders, 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` | `ExitableDirectoryReader` The `ExitableDirectoryReader` wraps a real index `DirectoryReader` and allows for a `QueryTimeout` implementation object to be checked periodically to see if the thread should exit or not.
    `static class` | `ExitableDirectoryReader.ExitableFilterAtomicReader` Wrapper class for another FilterAtomicReader.
    `class` | `FilterCodecReader` A `FilterCodecReader` contains another CodecReader, 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` | `FilterLeafReader` A `FilterLeafReader` contains another LeafReader, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
    `class` | `LeafReader` `LeafReader` is an abstract class, providing an interface for accessing an index.
    `class` | `MultiReader` A `CompositeReader` which reads multiple indexes, appending their content.
    `class` | `ParallelCompositeReader` An `CompositeReader` which reads multiple, parallel indexes.
    `class` | `ParallelLeafReader` An `LeafReader` which reads multiple, parallel indexes.
    `class` | `SegmentReader` IndexReader implementation over a single segment.
    `class` | `SoftDeletesDirectoryReaderWrapper` This reader filters out documents that have a doc values value in the given field and treat these documents as soft deleted.
    `class` | `StandardDirectoryReader` Default implementation of `DirectoryReader`.

    Methods in org.apache.lucene.index that return IndexReader
    Modifier and Type | Method and Description
    --- | ---
    `abstract IndexReader` | IndexReaderContext.`reader()` Returns the `IndexReader`, this context represents.

    Methods in org.apache.lucene.index that return types with arguments of type IndexReader
    Modifier and Type | Method and Description
    --- | ---
    `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
    Modifier and Type | Method and Description
    --- | ---
    `static BinaryDocValues` | MultiDocValues.`getBinaryValues(IndexReader r, String field)` Returns a BinaryDocValues for a reader's docvalues (potentially merging on-the-fly)
    `static int` | PointValues.`getDocCount(IndexReader reader, String field)` Return the cumulated number of docs that have points across all leaves of the given `IndexReader`.
    `static Collection<String>` | FieldInfos.`getIndexedFields(IndexReader reader)` Returns a set of names of fields that have a terms index.
    `static Bits` | MultiBits.`getLiveDocs(IndexReader reader)` Returns a single `Bits` instance for this reader, merging live Documents on the fly.
    `static byte[]` | PointValues.`getMaxPackedValue(IndexReader reader, String field)` Return the maximum packed values across all leaves of the given `IndexReader`.
    `static FieldInfos` | FieldInfos.`getMergedFieldInfos(IndexReader reader)` Call this to get the (merged) FieldInfos for a composite reader.
    `static byte[]` | PointValues.`getMinPackedValue(IndexReader reader, String field)` Return the minimum packed values across all leaves of the given `IndexReader`.
    `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 SortedNumericDocValues` | MultiDocValues.`getSortedNumericValues(IndexReader r, String field)` Returns a SortedNumericDocValues 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 PostingsEnum` | MultiTerms.`getTermPostingsEnum(IndexReader r, String field, BytesRef term)` Returns `PostingsEnum` for the specified field and term.
    `static PostingsEnum` | MultiTerms.`getTermPostingsEnum(IndexReader r, String field, BytesRef term, int flags)` Returns `PostingsEnum` for the specified field and term, with control over whether freqs, positions, offsets or payloads are required.
    `static Terms` | MultiTerms.`getTerms(IndexReader r, String field)` This method may return null if the field does not exist or if it has no terms.
    `void` | IndexReader.`registerParentReader(IndexReader reader)` Expert: This method is called by `IndexReader`s which wrap other readers (e.g.
    `static long` | PointValues.`size(IndexReader reader, String field)` Return the cumulated number of points across all leaves of the given `IndexReader`.
    `long` | 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)`).
    `long` | IndexWriter.`tryUpdateDocValue(IndexReader readerIn, int docID, Field... fields)` Expert: attempts to update doc values by document ID, as long as the provided reader is a near-real-time reader (from `DirectoryReader.open(IndexWriter)`).

    Constructors in org.apache.lucene.index with parameters of type IndexReader
    Constructor and Description
    `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
    Modifier and Type | Method and Description
    --- | ---
    `IndexReader` | IndexSearcher.`getIndexReader()` Return the `IndexReader` this searches.

    Methods in org.apache.lucene.search with parameters of type IndexReader
    Modifier and Type | Method and Description
    --- | ---
    `static IndexSearcher` | SearcherManager.`getSearcher(SearcherFactory searcherFactory, IndexReader reader, IndexReader previousReader)` Expert: creates a searcher from the provided `IndexReader` using the provided `SearcherFactory`.
    `IndexSearcher` | SearcherFactory.`newSearcher(IndexReader reader, IndexReader previousReader)` Returns a new IndexSearcher over the given reader.
    `Query` | SynonymQuery.`rewrite(IndexReader reader)`
    `Query` | NGramPhraseQuery.`rewrite(IndexReader reader)`
    `Query` | BlendedTermQuery.`rewrite(IndexReader reader)`
    `Query` | Query.`rewrite(IndexReader reader)` Expert: called to re-write queries into primitive queries.
    `Query` | IndexOrDocValuesQuery.`rewrite(IndexReader reader)`
    `Query` | TermInSetQuery.`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` | BoostQuery.`rewrite(IndexReader reader)`
    `Query` | DisjunctionMaxQuery.`rewrite(IndexReader reader)` Optimize our representation and our subqueries representations
    `Query` | ConstantScoreQuery.`rewrite(IndexReader reader)`
    `Query` | BooleanQuery.`rewrite(IndexReader reader)`
    `Query` | PhraseQuery.`rewrite(IndexReader reader)`
    `Query` | ScoringRewrite.`rewrite(IndexReader reader, MultiTermQuery query)`
    `Query` | DocValuesRewriteMethod.`rewrite(IndexReader reader, MultiTermQuery query)`
    `abstract Query` | MultiTermQuery.RewriteMethod.`rewrite(IndexReader reader, MultiTermQuery query)`
    `Query` | TopTermsRewrite.`rewrite(IndexReader reader, MultiTermQuery query)`

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

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

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

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