# Package org.apache.lucene.analysis.core

Basic, general-purpose analysis components.

- Class Summary
  Class | Description
  --- | ---
  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`.