Package org.apache.lucene.codecs.uniformsplit

Pluggable term index / block terms dictionary implementations.

Structure similar to VariableGapTermsIndexWriter with additional optimizations.

• Designed to be extensible
• Reduced on-heap memory usage.
• Efficient to seek terms (TermQuery, PhraseQuery)
• Quite efficient for PrefixQuery
• Not efficient for spell-check and FuzzyQuery, in this case prefer Lucene90PostingsFormat

Interface Summary

Interface	Description
BlockDecoder	Decodes the raw bytes of a block when the index is read, according to the BlockEncoder used during the writing of the index.
BlockEncoder	Encodes the raw bytes of a block when the index is written.
BlockEncoder.WritableBytes	Writable byte buffer.
IndexDictionary	Immutable stateless index dictionary kept in RAM.
IndexDictionary.Browser	Stateful IndexDictionary.Browser to seek a term in this IndexDictionary and get its corresponding block file pointer in the block file.
IndexDictionary.BrowserSupplier	Supplier for a new stateful IndexDictionary.Browser created on the immutable IndexDictionary.
IndexDictionary.Builder	Builds an immutable IndexDictionary.

Class Summary

Class	Description
BlockHeader	Block header containing block metadata.
BlockHeader.Serializer	Reads/writes block header.
BlockLine	One term block line.
BlockLine.Serializer	Reads/writes block lines with terms encoded incrementally inside a block.
BlockReader	Seeks the block corresponding to a given term, read the block bytes, and scans the block terms.
BlockWriter	Writes blocks in the block file.
DeltaBaseTermStateSerializer	TermState serializer which encodes each file pointer as a delta relative to a base file pointer.
FieldMetadata	Metadata and stats for one field in the index.
FieldMetadata.Serializer	Reads/writes field metadata.
FSTDictionary	Immutable stateless FST-based index dictionary kept in memory.
FSTDictionary.BrowserSupplier	Provides stateful FSTDictionary.Browser to seek in the FSTDictionary.
FSTDictionary.Builder	Builds an immutable FSTDictionary.
IntersectBlockReader	The "intersect" TermsEnum response to UniformSplitTerms.intersect(CompiledAutomaton, BytesRef), intersecting the terms with an automaton.
RamUsageUtil	Utility methods to estimate the RAM usage of objects.
TermBytes	Term of a block line.
UniformSplitPostingsFormat	PostingsFormat based on the Uniform Split technique.
UniformSplitTerms	Terms based on the Uniform Split technique.
UniformSplitTermsReader	A block-based terms index and dictionary based on the Uniform Split technique.
UniformSplitTermsWriter	A block-based terms index and dictionary that assigns terms to nearly uniform length blocks.

Enum Summary

Enum	Description
IntersectBlockReader.BlockIteration	Block iteration order.