# Package org.apache.lucene.analysis.core

Basic, general-purpose analysis components.

See: Description

Class Summary
DecimalDigitFilter: Folds all Unicode digits in `[:General_Category=Decimal_Number:]` to Basic Latin digits (`0-9`).
DecimalDigitFilterFactory: Factory for `DecimalDigitFilter`.
FlattenGraphFilter: Converts an incoming graph token stream, such as one from `SynonymGraphFilter`, into a flat form so that all nodes form a single linear chain with no side paths.
FlattenGraphFilterFactory: Factory for `FlattenGraphFilter`.
KeywordAnalyzer: "Tokenizes" the entire stream as a single token.
KeywordTokenizer: Emits the entire input as a single token.
KeywordTokenizerFactory: Factory for `KeywordTokenizer`.
LetterTokenizer: A LetterTokenizer is a tokenizer that divides text at non-letters.
LetterTokenizerFactory: Factory for `LetterTokenizer`.
LowerCaseFilter: Normalizes token text to lower case.
LowerCaseFilterFactory: Factory for `LowerCaseFilter`.
SimpleAnalyzer: An `Analyzer` that filters `LetterTokenizer` with `LowerCaseFilter`
StopAnalyzer: Filters `LetterTokenizer` with `LowerCaseFilter` and `StopFilter`.
StopFilter: Removes stop words from a token stream.
StopFilterFactory: Factory for `StopFilter`.
TypeTokenFilter: Removes tokens whose types appear in a set of blocked types from a token stream.
TypeTokenFilterFactory: Factory class for `TypeTokenFilter`.
UnicodeWhitespaceAnalyzer: An Analyzer that uses `UnicodeWhitespaceTokenizer`.
UnicodeWhitespaceTokenizer: A UnicodeWhitespaceTokenizer is a tokenizer that divides text at whitespace.
UpperCaseFilter: Normalizes token text to UPPER CASE.
UpperCaseFilterFactory: Factory for `UpperCaseFilter`.
WhitespaceAnalyzer: An Analyzer that uses `WhitespaceTokenizer`.
WhitespaceTokenizer: A tokenizer that divides text at whitespace characters as defined by `Character.isWhitespace(int)`.
WhitespaceTokenizerFactory: Factory for `WhitespaceTokenizer`.

## Package org.apache.lucene.analysis.core Description

Basic, general-purpose analysis components.