# Uses of Package
org.apache.lucene.queries.function.valuesource

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

- Classes in org.apache.lucene.queries.function.valuesource used by org.apache.lucene.queries.function.valuesource
  Class and Description
  BoolFunction Abstract parent class for those `ValueSource` implementations which apply boolean logic to their values
  ConstNumberSource `ConstNumberSource` is the base class for all constant numbers
  DocFreqValueSource `DocFreqValueSource` returns the number of documents containing the term.
  DoubleFieldSource Obtains double field values from `LeafReader.getNumericDocValues(java.lang.String)` and makes those values available as other numeric types, casting as needed.
  DualFloatFunction Abstract `ValueSource` implementation which wraps two ValueSources and applies an extendible float function to their values.
  FieldCacheSource A base class for ValueSource implementations that retrieve values for a single field from DocValues.
  FloatFieldSource Obtains float field values from `LeafReader.getNumericDocValues(java.lang.String)` and makes those values available as other numeric types, casting as needed.
  IntFieldSource Obtains int field values from `LeafReader.getNumericDocValues(java.lang.String)` and makes those values available as other numeric types, casting as needed.
  LongFieldSource Obtains long field values from `LeafReader.getNumericDocValues(java.lang.String)` and makes those values available as other numeric types, casting as needed.
  MultiFloatFunction Abstract `ValueSource` implementation which wraps multiple ValueSources and applies an extendible float function to their values.
  MultiFunction Abstract parent class for `ValueSource` implementations that wrap multiple ValueSources and apply their own logic.
  MultiValueSource A `ValueSource` that abstractly represents `ValueSource`s for poly fields, and other things.
  SingleFunction A function with a single argument
  TermFreqValueSource Function that returns `PostingsEnum.freq()` for the supplied term in every document.

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