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

- Packages that use LeafReader
  Package | Description
  --- | ---
  org.apache.lucene.index | Code to maintain and access indices.
  org.apache.lucene.search | Code to search indices.

- - ### Uses of LeafReader in org.apache.lucene.index

    Subclasses of LeafReader in org.apache.lucene.index
    Modifier and Type | Class and Description
    --- | ---
    `class` | `CodecReader` LeafReader implemented by codec APIs.
    `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` | `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` | `ParallelLeafReader` An `LeafReader` which reads multiple, parallel indexes.
    `class` | `SegmentReader` IndexReader implementation over a single segment.

    Fields in org.apache.lucene.index declared as LeafReader
    Modifier and Type | Field and Description
    --- | ---
    `protected LeafReader` | FilterLeafReader.`in` The underlying LeafReader.

    Methods in org.apache.lucene.index that return LeafReader
    Modifier and Type | Method and Description
    --- | ---
    `LeafReader` | FilterLeafReader.`getDelegate()` Returns the wrapped `LeafReader`.
    `LeafReader[]` | ParallelLeafReader.`getParallelReaders()` Returns the `LeafReader`s that were passed on init.
    `LeafReader` | LeafReaderContext.`reader()`
    `static LeafReader` | FilterLeafReader.`unwrap(LeafReader reader)` Get the wrapped instance by `reader` as long as this reader is an instance of `FilterLeafReader`.
    `abstract LeafReader` | FilterDirectoryReader.SubReaderWrapper.`wrap(LeafReader reader)` Wrap one of the parent DirectoryReader's subreaders
    `LeafReader` | ExitableDirectoryReader.ExitableSubReaderWrapper.`wrap(LeafReader reader)`
    `protected LeafReader[]` | FilterDirectoryReader.SubReaderWrapper.`wrap(List<? extends LeafReader> readers)` Wraps a list of LeafReaders

    Methods in org.apache.lucene.index with parameters of type LeafReader
    Modifier and Type | Method and Description
    --- | ---
    `static BinaryDocValues` | DocValues.`getBinary(LeafReader reader, String field)` Returns BinaryDocValues for the field, or `DocValues.emptyBinary()` if it has none.
    `static NumericDocValues` | DocValues.`getNumeric(LeafReader reader, String field)` Returns NumericDocValues for the field, or `DocValues.emptyNumeric()` if it has none.
    `static SortedDocValues` | DocValues.`getSorted(LeafReader reader, String field)` Returns SortedDocValues for the field, or `DocValues.emptySorted()` if it has none.
    `static SortedNumericDocValues` | DocValues.`getSortedNumeric(LeafReader reader, String field)` Returns SortedNumericDocValues for the field, or `DocValues.emptySortedNumeric(int)` if it has none.
    `static SortedSetDocValues` | DocValues.`getSortedSet(LeafReader reader, String field)` Returns SortedSetDocValues for the field, or `DocValues.emptySortedSet()` if it has none.
    `static LeafReader` | FilterLeafReader.`unwrap(LeafReader reader)` Get the wrapped instance by `reader` as long as this reader is an instance of `FilterLeafReader`.
    `void` | SimpleMergedSegmentWarmer.`warm(LeafReader reader)`
    `void` | IndexWriter.IndexReaderWarmer.`warm(LeafReader reader)` Invoked on the `LeafReader` for the newly merged segment, before that segment is made visible to near-real-time readers.
    `abstract LeafReader` | FilterDirectoryReader.SubReaderWrapper.`wrap(LeafReader reader)` Wrap one of the parent DirectoryReader's subreaders
    `static CodecReader` | SlowCodecReaderWrapper.`wrap(LeafReader reader)` Returns a `CodecReader` view of reader.
    `LeafReader` | ExitableDirectoryReader.ExitableSubReaderWrapper.`wrap(LeafReader reader)`

    Method parameters in org.apache.lucene.index with type arguments of type LeafReader
    Modifier and Type | Method and Description
    --- | ---
    `static DirectoryReader` | StandardDirectoryReader.`open(Directory directory, SegmentInfos infos, List<? extends LeafReader> oldReaders)` This constructor is only used for `StandardDirectoryReader.doOpenIfChanged(SegmentInfos)`, as well as NRT replication.
    `protected LeafReader[]` | FilterDirectoryReader.SubReaderWrapper.`wrap(List<? extends LeafReader> readers)` Wraps a list of LeafReaders

    Constructors in org.apache.lucene.index with parameters of type LeafReader
    Constructor and Description
    `DirectoryReader(Directory directory, LeafReader[] segmentReaders)` Expert: Constructs a `DirectoryReader` on the given subReaders.
    `ExitableFilterAtomicReader(LeafReader in, QueryTimeout queryTimeout)` Constructor
    `FilterLeafReader(LeafReader in)` Construct a FilterLeafReader based on the specified base reader.
    `ParallelLeafReader(boolean closeSubReaders, LeafReader... readers)` Create a ParallelLeafReader based on the provided readers.
    `ParallelLeafReader(boolean closeSubReaders, LeafReader[] readers, LeafReader[] storedFieldsReaders)` Expert: create a ParallelLeafReader based on the provided readers and storedFieldReaders; when a document is loaded, only storedFieldsReaders will be used.
    `ParallelLeafReader(boolean closeSubReaders, LeafReader[] readers, LeafReader[] storedFieldsReaders)` Expert: create a ParallelLeafReader based on the provided readers and storedFieldReaders; when a document is loaded, only storedFieldsReaders will be used.
    `ParallelLeafReader(LeafReader... readers)` Create a ParallelLeafReader based on the provided readers; auto-closes the given readers on `IndexReader.close()`.

  - ### Uses of LeafReader in org.apache.lucene.search

    Methods in org.apache.lucene.search with parameters of type LeafReader
    Modifier and Type | Method and Description
    --- | ---
    `static DocIdSetIterator` | DocValuesFieldExistsQuery.`getDocValuesDocIdSetIterator(String field, LeafReader reader)` Returns a `DocIdSetIterator` from the given field or null if the field doesn't exist in the reader or if the reader has no doc values for the field.

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