Package org.apache.lucene.index

Code to maintain and access indices.

See:
Description

Interface Summary

IndexDeletionPolicy	Expert: policy for deletion of stale index commits.
TermDocs	TermDocs provides an interface for enumerating <document, frequency> pairs for a term.
TermFreqVector	Provides access to stored term vector of a document field.
TermPositions	TermPositions provides an interface for enumerating the <document, frequency, <position>* > tuples for a term.
TermPositionVector	Extends TermFreqVector to provide additional information about positions in which each of the terms is found.

Class Summary

AbstractAllTermDocs	Base class for enumerating all but deleted docs.
BalancedSegmentMergePolicy	Merge policy that tries to balance not doing large segment merges with not accumulating too many segments in the index, to provide for better performance in near real-time setting.
BalancedSegmentMergePolicy.MergePolicyParams
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.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.
ConcurrentMergeScheduler	A MergeScheduler that runs each merge using a separate thread, up until a maximum number of threads (ConcurrentMergeScheduler.setMaxThreadCount(int)) at which when a merge is needed, the thread(s) that are updating the index will pause until one or more merges completes.
FieldInvertState	This class tracks the number and position / offset parameters of terms being added to the index.
FieldNormModifier	Given a directory and a list of fields, updates the fieldNorms in place for every document.
FieldSortedTermVectorMapper	For each Field, store a sorted collection of TermVectorEntrys This is not thread-safe.
FilterIndexReader	A FilterIndexReader contains another IndexReader, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterIndexReader.FilterTermDocs	Base class for filtering TermDocs implementations.
FilterIndexReader.FilterTermEnum	Base class for filtering TermEnum implementations.
FilterIndexReader.FilterTermPositions	Base class for filtering TermPositions implementations.
IndexCommit	Expert: represents a single commit into an index as seen by the IndexDeletionPolicy or IndexReader.
IndexFileNameFilter	Filename filter that accept filenames and extensions only created by Lucene.
IndexReader	IndexReader is an abstract class, providing an interface for accessing an index.
IndexReader.FieldOption	Constants describing field properties, for example used for IndexReader.getFieldNames(FieldOption).
IndexSplitter	Command-line tool that enables listing segments in an index, copying specific segments to another index, and deleting segments from an index.
IndexWriter	An IndexWriter creates and maintains an index.
IndexWriter.IndexReaderWarmer	If IndexWriter.getReader() 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.
IndexWriter.MaxFieldLength	Specifies maximum field length (in number of tokens/terms) in IndexWriter constructors.
KeepOnlyLastCommitDeletionPolicy	This IndexDeletionPolicy implementation that keeps only the most recent commit and immediately removes all prior commits after a new commit is done.
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 to be used for overall merge and optimize 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.
MultiPassIndexSplitter	This tool splits input index into multiple equal parts.
MultiPassIndexSplitter.FakeDeleteIndexReader	This class pretends that it can write deletions to the underlying index.
MultipleTermPositions	Allows you to iterate over the TermPositions for multiple Terms as a single TermPositions.
MultiReader	An IndexReader which reads multiple indexes, appending their content.
ParallelReader	An IndexReader which reads multiple, parallel indexes.
Payload	A Payload is metadata that can be stored together with each occurrence of a term.
PositionBasedTermVectorMapper	For each Field, store position by position information.
PositionBasedTermVectorMapper.TVPositionInfo	Container for a term at a position
SegmentInfo	Information about a segment such as it's name, directory, and files related to the segment.
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	NOTE: This API is new and still experimental (subject to change suddenly in the next release)
SerialMergeScheduler	A MergeScheduler that simply does each merge sequentially, using the current thread.
SnapshotDeletionPolicy	A IndexDeletionPolicy that wraps around any other IndexDeletionPolicy and adds the ability to hold and later release a single "snapshot" of an index.
SortedTermVectorMapper	Store a sorted collection of TermVectorEntrys.
Term	A Term represents a word from text.
TermEnum	Abstract class for enumerating terms.
TermVectorAccessor	Transparent access to the vector space model, either via TermFreqVector or by resolving it from the inverted index.
TermVectorEntry	Convenience class for holding TermVector information.
TermVectorEntryFreqSortedComparator	Compares TermVectorEntrys first by frequency and then by the term (case-sensitive)
TermVectorMapper	The TermVectorMapper can be used to map Term Vectors into your own structure instead of the parallel array structure used by IndexReader.getTermFreqVector(int,String).
TermVectorOffsetInfo	The TermVectorOffsetInfo class holds information pertaining to a Term in a TermPositionVector's offset information.

Exception Summary

CorruptIndexException	This exception is thrown when Lucene detects an inconsistency in the index.
FieldReaderException
MergePolicy.MergeAbortedException
MergePolicy.MergeException	Exception thrown if there are any problems while executing a merge.
StaleReaderException	This exception is thrown when an IndexReader tries to make changes to the index (via IndexReader.deleteDocument(int), IndexReader.undeleteAll() or IndexReader.setNorm(int, java.lang.String, byte)) but changes have already been committed to the index since this reader was instantiated.

Package org.apache.lucene.index Description

Code to maintain and access indices.