Lucene 4.0.0 core API

Apache Lucene is a high-performance, full-featured text search engine library.

See: Description

Packages 
Package Description
org.apache.lucene
Top-level package.
org.apache.lucene.analysis
API and code to convert text into indexable/searchable tokens.
org.apache.lucene.analysis.tokenattributes
General-purpose attributes for text analysis.
org.apache.lucene.codecs
Codecs API: API for customization of the encoding and structure of the index.
org.apache.lucene.codecs.lucene3x
Codec to support Lucene 3.x indexes (readonly)
org.apache.lucene.codecs.lucene40
Lucene 4.0 file format.
org.apache.lucene.codecs.lucene40.values
Default DocValues implementation for Lucene 4.0 indexes.
org.apache.lucene.codecs.perfield
Postings format that can delegate to different formats per-field.
org.apache.lucene.document
The logical representation of a Document for indexing and searching.
org.apache.lucene.index
Code to maintain and access indices.
org.apache.lucene.search
Code to search indices.
org.apache.lucene.search.payloads
The payloads package provides Query mechanisms for finding and using payloads.
org.apache.lucene.search.similarities
This package contains the various ranking models that can be used in Lucene.
org.apache.lucene.search.spans
The calculus of spans.
org.apache.lucene.store
Binary i/o API, used for all index data.
org.apache.lucene.util
Some utility classes.
org.apache.lucene.util.automaton
Finite-state automaton for regular expressions.
org.apache.lucene.util.fst
Finite state transducers
org.apache.lucene.util.mutable
Comparable object wrappers
org.apache.lucene.util.packed
Packed integer arrays and streams.

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