Package org.apache.lucene.index

Code to maintain and access indices.

See: Description

Interface Summary

Interface	Description
IndexableField	Represents a single field for indexing.
IndexableFieldType	Describes the properties of a field.
IndexDeletionPolicy	Expert: policy for deletion of stale index commits.
IndexReader.ReaderClosedListener	A custom listener that's invoked when the IndexReader is closed.
SegmentReader.CoreClosedListener	Called when the shared core for this SegmentReader is closed.
SortedBytesMergeUtils.BytesRefConsumer
TwoPhaseCommit	An interface for implementations that support 2-phase commit.

Class Summary

Class	Description
AtomicReader	AtomicReader is an abstract class, providing an interface for accessing an index.
AtomicReaderContext	IndexReaderContext for AtomicReader instances
BaseCompositeReader<R extends IndexReader>	Base class for implementing CompositeReaders based on an array of sub-readers.
CheckIndex	Basic tool and API to check the health of an index and write a new segments file that removes reference to problematic segments.
CheckIndex.Status	Returned from CheckIndex.checkIndex() detailing the health and status of the index.
CheckIndex.Status.DocValuesStatus	Status from testing DocValues
CheckIndex.Status.FieldNormStatus	Status from testing field norms.
CheckIndex.Status.SegmentInfoStatus	Holds the status of each segment in the index.
CheckIndex.Status.StoredFieldStatus	Status from testing stored fields.
CheckIndex.Status.TermIndexStatus	Status from testing term index.
CheckIndex.Status.TermVectorStatus	Status from testing stored fields.
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.
CompositeReaderContext	IndexReaderContext for CompositeReader instance.
ConcurrentMergeScheduler	A MergeScheduler that runs each merge using a separate thread.
DirectoryReader	DirectoryReader is an implementation of CompositeReader that can read indexes in a Directory.
DocsAndPositionsEnum	Also iterates through positions.
DocsEnum	Iterates through the documents and term freqs.
DocTermOrds	This class enables fast access to multiple term ords for a specified field across all docIDs.
DocValues	DocValues provides a dense per-document typed storage for fast value access based on the lucene internal document id.
DocValues.SortedSource	A sorted variant of DocValues.Source for byte[] values per document.
DocValues.Source	Source of per document values like long, double or BytesRef depending on the DocValues fields DocValues.Type.
DocValues.SourceCache	Abstract base class for DocValues DocValues.Source cache.
DocValues.SourceCache.DirectSourceCache	Simple per DocValues instance cache implementation that holds a DocValues.Source a member variable.
FieldInfo	Access to the Fieldable Info file that describes document fields and whether or not they are indexed.
FieldInfos	Collection of FieldInfos (accessible by number or by name).
FieldInvertState	This class tracks the number and position / offset parameters of terms being added to the index.
Fields	Flex API for access to fields and terms
FieldsEnum	Enumerates indexed fields.
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.
FilterAtomicReader.FilterDocsAndPositionsEnum	Base class for filtering DocsAndPositionsEnum implementations.
FilterAtomicReader.FilterDocsEnum	Base class for filtering DocsEnum implementations.
FilterAtomicReader.FilterFields	Base class for filtering Fields implementations.
FilterAtomicReader.FilterFieldsEnum	Base class for filtering TermsEnum implementations.
FilterAtomicReader.FilterTerms	Base class for filtering Terms implementations.
FilterAtomicReader.FilterTermsEnum	Base class for filtering TermsEnum implementations.
FilteredTermsEnum	Abstract class for enumerating a subset of all terms.
IndexCommit	Expert: represents a single commit into an index as seen by the IndexDeletionPolicy or IndexReader.
IndexFileNames	This class contains useful constants representing filenames and extensions used by lucene, as well as convenience methods for querying whether a file name matches an extension (matchesExtension), as well as generating file names from a segment name, generation and extension ( fileNameFromGeneration, segmentFileName).
IndexReader	IndexReader is an abstract class, providing an interface for accessing an index.
IndexReaderContext	A struct like class that represents a hierarchical relationship between IndexReader instances.
IndexUpgrader	This is an easy-to-use tool that upgrades all segments of an index from previous Lucene versions to the current segment file format.
IndexWriter	An IndexWriter creates and maintains an index.
IndexWriter.IndexReaderWarmer	If DirectoryReader.open(IndexWriter,boolean) has been called (ie, this writer is in near real-time mode), then after a merge completes, this class can be invoked to warm the reader on the newly merged segment, before the merge commits.
IndexWriterConfig	Holds all the configuration that is used to create an IndexWriter.
KeepOnlyLastCommitDeletionPolicy	This IndexDeletionPolicy implementation that keeps only the most recent commit and immediately removes all prior commits after a new commit is done.
LiveIndexWriterConfig	Holds all the configuration used by IndexWriter with few setters for settings that can be changed on an IndexWriter instance "live".
LogByteSizeMergePolicy	This is a LogMergePolicy that measures size of a segment as the total byte size of the segment's files.
LogDocMergePolicy	This is a LogMergePolicy that measures size of a segment as the number of documents (not taking deletions into account).
LogMergePolicy	This class implements a MergePolicy that tries to merge segments into levels of exponentially increasing size, where each level has fewer segments than the value of the merge factor.
MergePolicy	Expert: a MergePolicy determines the sequence of primitive merge operations.
MergePolicy.MergeSpecification	A MergeSpecification instance provides the information necessary to perform multiple merges.
MergePolicy.OneMerge	OneMerge provides the information necessary to perform an individual primitive merge operation, resulting in a single new segment.
MergeScheduler	Expert: IndexWriter uses an instance implementing this interface to execute the merges selected by a MergePolicy.
MergeState	Holds common state used during segment merging
MergeState.CheckAbort
MergeState.DocMap
MultiDocsAndPositionsEnum	Exposes flex API, merged from flex API of sub-segments.
MultiDocsAndPositionsEnum.EnumWithSlice
MultiDocsEnum	Exposes flex API, merged from flex API of sub-segments.
MultiDocsEnum.EnumWithSlice
MultiDocValues	A wrapper for CompositeIndexReader providing access to per segment DocValues
MultiDocValues.DocValuesSlice
MultiDocValues.EmptyDocValues
MultiDocValues.EmptyFixedDocValues
MultiFields	Exposes flex API, merged from flex API of sub-segments.
MultiFieldsEnum	Exposes flex API, merged from flex API of sub-segments.
MultiFieldsEnum.FieldsEnumWithSlice
MultiReader	A CompositeReader which reads multiple indexes, appending their content.
MultiTerms	Exposes flex API, merged from flex API of sub-segments.
MultiTermsEnum	Exposes flex API, merged from flex API of sub-segments.
NoDeletionPolicy	An IndexDeletionPolicy which keeps all index commits around, never deleting them.
NoMergePolicy	A MergePolicy which never returns merges to execute (hence it's name).
NoMergeScheduler	A MergeScheduler which never executes any merges.
Norm	Stores the normalization value computed in Similarity.computeNorm(FieldInvertState, Norm) per field.
OrdTermState	An ordinal based TermState
ParallelAtomicReader	An AtomicReader which reads multiple, parallel indexes.
ParallelCompositeReader	An CompositeReader which reads multiple, parallel indexes.
PayloadProcessorProvider	Provides a PayloadProcessorProvider.ReaderPayloadProcessor to be used for a Directory.
PayloadProcessorProvider.PayloadProcessor	Processes the given payload.
PayloadProcessorProvider.ReaderPayloadProcessor	Returns a PayloadProcessorProvider.ReaderPayloadProcessor for a given Term which allows processing the payloads of different terms differently.
PerDocWriteState	Encapsulates all necessary state to initiate a PerDocConsumer and create all necessary files in order to consume and merge per-document values.
PersistentSnapshotDeletionPolicy	A SnapshotDeletionPolicy which adds a persistence layer so that snapshots can be maintained across the life of an application.
ReaderManager	Utility class to safely share DirectoryReader instances across multiple threads, while periodically reopening.
ReaderSlice	Subreader slice from a parent composite reader.
ReaderUtil	Common util methods for dealing with IndexReaders and IndexReaderContexts.
SegmentInfo	Information about a segment such as it's name, directory, and files related to the segment.
SegmentInfoPerCommit	Embeds a [read-only] SegmentInfo and adds per-commit fields.
SegmentInfos	A collection of segmentInfo objects with methods for operating on those segments in relation to the file system.
SegmentInfos.FindSegmentsFile	Utility class for executing code that needs to do something with the current segments file.
SegmentReader	IndexReader implementation over a single segment.
SegmentReadState	Holder class for common parameters used during read.
SegmentWriteState	Holder class for common parameters used during write.
SerialMergeScheduler	A MergeScheduler that simply does each merge sequentially, using the current thread.
SingleTermsEnum	Subclass of FilteredTermsEnum for enumerating a single term.
SlowCompositeReaderWrapper	This class forces a composite reader (eg a MultiReader or DirectoryReader) to emulate an atomic reader.
SnapshotDeletionPolicy	An IndexDeletionPolicy that wraps around any other IndexDeletionPolicy and adds the ability to hold and later release snapshots of an index.
SortedBytesMergeUtils
SortedBytesMergeUtils.IndexOutputBytesRefConsumer
SortedBytesMergeUtils.MergeContext
SortedBytesMergeUtils.SortedSourceSlice
StoredFieldVisitor	Expert: provides a low-level means of accessing the stored field values in an index.
Term	A Term represents a word from text.
TermContext	Maintains a IndexReader TermState view over IndexReader instances containing a single term.
Terms	Access to the terms in a specific field.
TermsEnum	Iterator to seek (TermsEnum.seekCeil(BytesRef), TermsEnum.seekExact(BytesRef,boolean)) or step through (BytesRefIterator.next() terms to obtain frequency information (TermsEnum.docFreq()), DocsEnum or DocsAndPositionsEnum for the current term (TermsEnum.docs(org.apache.lucene.util.Bits, org.apache.lucene.index.DocsEnum).
TermState	Encapsulates all required internal state to position the associated TermsEnum without re-seeking.
TieredMergePolicy	Merges segments of approximately equal size, subject to an allowed number of segments per tier.
TieredMergePolicy.MergeScore	Holds score and explanation for a single candidate merge.
TwoPhaseCommitTool	A utility for executing 2-phase commit on several objects.
TwoPhaseCommitTool.TwoPhaseCommitWrapper	A wrapper of a TwoPhaseCommit, which delegates all calls to the wrapped object, passing the specified commitData.
UpgradeIndexMergePolicy	This MergePolicy is used for upgrading all existing segments of an index when calling IndexWriter.forceMerge(int).

Enum Summary

Enum	Description
DocValues.Type	Type specifies the DocValues type for a certain field.
FieldInfo.IndexOptions	Controls how much information is stored in the postings lists.
FilteredTermsEnum.AcceptStatus	Return value, if term should be accepted or the iteration should END.
IndexWriterConfig.OpenMode	Specifies the open mode for IndexWriter.
StoredFieldVisitor.Status	Enumeration of possible return values for StoredFieldVisitor.needsField(org.apache.lucene.index.FieldInfo).
TermsEnum.SeekStatus	Represents returned result from TermsEnum.seekCeil(org.apache.lucene.util.BytesRef, boolean).

Exception Summary

Exception	Description
CorruptIndexException	This exception is thrown when Lucene detects an inconsistency in the index.
IndexFormatTooNewException	This exception is thrown when Lucene detects an index that is newer than this Lucene version.
IndexFormatTooOldException	This exception is thrown when Lucene detects an index that is too old for this Lucene version
IndexNotFoundException	Signals that no index was found in the Directory.
MergePolicy.MergeAbortedException
MergePolicy.MergeException	Exception thrown if there are any problems while executing a merge.
TwoPhaseCommitTool.CommitFailException	Thrown by TwoPhaseCommitTool.execute(TwoPhaseCommit...) when an object fails to commit().
TwoPhaseCommitTool.PrepareCommitFailException	Thrown by TwoPhaseCommitTool.execute(TwoPhaseCommit...) when an object fails to prepareCommit().

Package org.apache.lucene.index Description

Code to maintain and access indices.