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

- Packages that use org.apache.lucene.queries.function
  Package | Description
  --- | ---
  org.apache.lucene.queries | Filters and Queries that add to core Lucene.
  org.apache.lucene.queries.function | Queries that compute score based upon a function.
  org.apache.lucene.queries.function.docvalues | FunctionValues for different data types.
  org.apache.lucene.queries.function.valuesource | A variety of functions to use with FunctionQuery.

- Classes in org.apache.lucene.queries.function used by org.apache.lucene.queries
  Class and Description
  FunctionQuery Returns a score for each document based on a ValueSource, often some function of the value of a field.

- Classes in org.apache.lucene.queries.function used by org.apache.lucene.queries.function
  Class and Description
  FunctionQuery.FunctionWeight
  FunctionScoreQuery A query that wraps another query, and uses a DoubleValuesSource to replace or modify the wrapped query's score If the DoubleValuesSource doesn't return a value for a particular document, then that document will be given a score of 0.
  FunctionValues Represents field values as different types.
  FunctionValues.ValueFiller Abstraction of the logic required to fill the value of a specified doc into a reusable `MutableValue`.
  ValueSource Instantiates `FunctionValues` for a particular reader.
  ValueSourceScorer `Scorer` which returns the result of `FunctionValues.floatVal(int)` as the score for a document, and which filters out documents that don't match `ValueSourceScorer.matches(int)`.

- Classes in org.apache.lucene.queries.function used by org.apache.lucene.queries.function.docvalues
  Class and Description
  FunctionValues Represents field values as different types.
  FunctionValues.ValueFiller Abstraction of the logic required to fill the value of a specified doc into a reusable `MutableValue`.
  ValueSource Instantiates `FunctionValues` for a particular reader.
  ValueSourceScorer `Scorer` which returns the result of `FunctionValues.floatVal(int)` as the score for a document, and which filters out documents that don't match `ValueSourceScorer.matches(int)`.

- Classes in org.apache.lucene.queries.function used by org.apache.lucene.queries.function.valuesource
  Class and Description
  FunctionValues Represents field values as different types.
  FunctionValues.ValueFiller Abstraction of the logic required to fill the value of a specified doc into a reusable `MutableValue`.
  ValueSource Instantiates `FunctionValues` for a particular reader.

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