# 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
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.
VectorSimilarityFunction
`VectorSimilarityFunction` returns a similarity function between two knn vectors.