org.apache.lucene.util
Class ReaderUtil

java.lang.Object
  org.apache.lucene.util.ReaderUtil

public final class ReaderUtil
extends Object

Common util methods for dealing with IndexReaders.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Nested Class Summary

static class

ReaderUtil.Gather Recursively visits all sub-readers of a reader.

Method Summary

static void	gatherSubReaders(List<IndexReader> allSubReaders, IndexReader reader) Gathers sub-readers from reader into a List.
static Collection<String>	getIndexedFields(IndexReader reader)
static FieldInfos	getMergedFieldInfos(IndexReader reader) Call this to get the (merged) FieldInfos for a composite reader
static int	subIndex(int n, int[] docStarts) Returns index of the searcher/reader for document n in the array used to construct this searcher/reader.

Methods inherited from class java.lang.Object

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

Method Detail

gatherSubReaders

public static void gatherSubReaders(List<IndexReader> allSubReaders,
                                    IndexReader reader)

Gathers sub-readers from reader into a List.

Parameters:

allSubReaders -

reader -

subIndex

public static int subIndex(int n,
                           int[] docStarts)

Returns index of the searcher/reader for document n in the array used to construct this searcher/reader.

getIndexedFields

public static Collection<String> getIndexedFields(IndexReader reader)

getMergedFieldInfos

public static FieldInfos getMergedFieldInfos(IndexReader reader)

Call this to get the (merged) FieldInfos for a composite reader