Package org.apache.lucene.queries.function.valuesource

A variety of functions to use with FunctionQuery.

Class Summary

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 single-valued ValueSource view of a field.
MultiValuedFloatFieldSource	Obtains float field values from LeafReader.getSortedNumericDocValues(java.lang.String) and using a SortedNumericSelector it gives a single-valued ValueSource view of a field.
MultiValuedIntFieldSource	Obtains int field values from LeafReader.getSortedNumericDocValues(java.lang.String) and using a SortedNumericSelector it gives a single-valued ValueSource view of a field.
MultiValuedLongFieldSource	Obtains long field values from LeafReader.getSortedNumericDocValues(java.lang.String) and using a SortedNumericSelector it gives a single-valued ValueSource view of a field.
MultiValueSource	A ValueSource that abstractly represents ValueSources 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 multi-valued 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.