# Uses of Class
org.apache.lucene.queries.function.valuesource.DocFreqValueSource

Packages that use DocFreqValueSource
Package
Description
org.apache.lucene.queries.function.valuesource
A variety of functions to use with FunctionQuery.

- ## Uses of DocFreqValueSource in org.apache.lucene.queries.function.valuesource

  Subclasses of DocFreqValueSource in org.apache.lucene.queries.function.valuesource
  Modifier and Type
  Class
  Description
  `class`
  `IDFValueSource`
  Function that returns `#idf(long, long)` for every document.
  `class`
  `TermFreqValueSource`
  Function that returns `PostingsEnum.freq()` for the supplied term in every document.
  `class`
  `TFValueSource`
  Function that returns `TFIDFSimilarity.tf(float)` for every document.