See: Description
Class  Description 

BoolFunction 
Abstract parent class for those
ValueSource implementations which
apply boolean logic to their values 
BytesRefFieldSource 
An implementation for retrieving
FunctionValues instances for string based fields. 
ComparisonBoolFunction 
Base class for comparison operators useful within an "if"/conditional.

ConstNumberSource 
ConstNumberSource is the base class for all constant numbers 
ConstValueSource 
ConstValueSource returns a constant for all documents 
DefFunction 
ValueSource implementation which only returns the values from the provided
ValueSources which are available for a particular docId. 
DivFloatFunction 
Function to divide "a" by "b"

DocFreqValueSource 
DocFreqValueSource returns the number of documents containing the term. 
DoubleConstValueSource 
Function that returns a constant double value for every document.

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. 
EnumFieldSource 
Obtains int field values from
LeafReader.getNumericDocValues(java.lang.String) and makes
those values available as other numeric types, casting as needed. 
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. 
IDFValueSource 
Function that returns
#idf(long, long)
for every document. 
IfFunction 
Depending on the boolean value of the
ifSource function,
returns the value of the trueSource or falseSource function. 
IntFieldSource 
Obtains int field values from
LeafReader.getNumericDocValues(java.lang.String) and makes those
values available as other numeric types, casting as needed. 
JoinDocFreqValueSource 
Use a field value and find the Document Frequency within another field.

LinearFloatFunction 
LinearFloatFunction implements a linear function over
another ValueSource . 
LiteralValueSource 
Pass a the field value through as a String, no matter the type // Q: doesn't this mean it's a "string"?

LongFieldSource 
Obtains long field values from
LeafReader.getNumericDocValues(java.lang.String) and makes those
values available as other numeric types, casting as needed. 
MaxDocValueSource 
Returns the value of
IndexReader.maxDoc()
for every document. 
MaxFloatFunction 
MaxFloatFunction returns the max of its components. 
MinFloatFunction 
MinFloatFunction returns the min of its components. 
MultiBoolFunction 
Abstract
ValueSource implementation which wraps multiple ValueSources
and applies an extendible boolean function to their values. 
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. 
MultiValuedDoubleFieldSource 
Obtains double field values from
LeafReader.getSortedNumericDocValues(java.lang.String) and using a
SortedNumericSelector it gives a singlevalued ValueSource view of a field. 
MultiValuedFloatFieldSource 
Obtains float field values from
LeafReader.getSortedNumericDocValues(java.lang.String) and using a
SortedNumericSelector it gives a singlevalued ValueSource view of a field. 
MultiValuedIntFieldSource 
Obtains int field values from
LeafReader.getSortedNumericDocValues(java.lang.String) and using a
SortedNumericSelector it gives a singlevalued ValueSource view of a field. 
MultiValuedLongFieldSource 
Obtains long field values from
LeafReader.getSortedNumericDocValues(java.lang.String) and using a
SortedNumericSelector it gives a singlevalued ValueSource view of a field. 
MultiValueSource 
A
ValueSource that abstractly represents ValueSource s for
poly fields, and other things. 
NormValueSource 
Function that returns the decoded norm for every document.

NumDocsValueSource 
Returns the value of
IndexReader.numDocs()
for every document. 
PowFloatFunction 
Function to raise the base "a" to the power "b"

ProductFloatFunction 
ProductFloatFunction returns the product of its components. 
QueryValueSource 
QueryValueSource returns the relevance score of the query 
RangeMapFloatFunction 
RangeMapFloatFunction implements a map function over
another ValueSource whose values fall within min and max inclusive to target. 
ReciprocalFloatFunction 
ReciprocalFloatFunction implements a reciprocal function f(x) = a/(mx+b), based on
the float value of a field or function as exported by ValueSource . 
ScaleFloatFunction 
Scales values to be between min and max.

SimpleBoolFunction 
BoolFunction implementation which applies an extendible boolean
function to the values of a single wrapped ValueSource . 
SimpleFloatFunction 
A simple float function with a single argument

SingleFunction 
A function with a single argument

SortedSetFieldSource 
Retrieves
FunctionValues instances for multivalued string based fields. 
SumFloatFunction 
SumFloatFunction returns the sum of its components. 
SumTotalTermFreqValueSource 
SumTotalTermFreqValueSource returns the number of tokens. 
TermFreqValueSource 
Function that returns
PostingsEnum.freq() for the
supplied term in every document. 
TFValueSource 
Function that returns
TFIDFSimilarity.tf(float)
for every document. 
TotalTermFreqValueSource 
TotalTermFreqValueSource returns the total term freq
(sum of term freqs across all documents). 
VectorValueSource 
Converts individual ValueSource instances to leverage the FunctionValues *Val functions that work with multiple values,
i.e.

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