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

# Class MultiFunction

java.lang.Object
org.apache.lucene.queries.function.ValueSource
org.apache.lucene.queries.function.valuesource.MultiFunction

Direct Known Subclasses:
  `DefFunction`

public abstract class MultiFunction extends ValueSource
Abstract parent class for `ValueSource` implementations that wrap multiple ValueSources and apply their own logic.

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `class`
  `MultiFunction.Values`
  Base implementation that wraps multiple sources

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected final List<ValueSource>`
  `sources`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `MultiFunction(List<ValueSource> sources)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static boolean`
  `allExists(int doc, FunctionValues[] values)`
  Helper utility for `FunctionValues`
  `static boolean`
  `allExists(int doc, FunctionValues values1, FunctionValues values2)`
  Equivalent to the `FunctionValues[]` method with the same name, but optimized for dealing with exactly 2 arguments.
  `static boolean`
  `anyExists(int doc, FunctionValues[] values)`
  Helper utility for `FunctionValues`
  `static boolean`
  `anyExists(int doc, FunctionValues values1, FunctionValues values2)`
  Equivalent to the `FunctionValues[]` method with the same name, but optimized for dealing with exactly 2 arguments.
  `void`
  `createWeight(Map<Object,Object> context, IndexSearcher searcher)`
  Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context.
  `String`
  `description()`
  description of field, used in explain()
  `static String`
  `description(String name, List<ValueSource> sources)`
  `boolean`
  `equals(Object o)`
  `int`
  `hashCode()`
  `protected abstract String`
  `name()`
  `static String`
  `toString(String name, FunctionValues[] valsArr, int doc)`
  `static FunctionValues[]`
  `valsArr(List<ValueSource> sources, Map<Object,Object> fcontext, LeafReaderContext readerContext)`

  ### Methods inherited from class org.apache.lucene.queries.function.ValueSource

  `asDoubleValuesSource, asLongValuesSource, fromDoubleValuesSource, getSortField, getValues, newContext, toString`

  ### Methods inherited from class java.lang.Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### sources

    protected final List<ValueSource> sources

- ## Constructor Details

  - ### MultiFunction

    public MultiFunction(List<ValueSource> sources)

- ## Method Details

  - ### name

    protected abstract String name()

  - ### description

    public String description()
    Description copied from class: `ValueSource`
    description of field, used in explain()
    Specified by:
      `description` in class `ValueSource`

  - ### allExists

    public static boolean allExists(int doc, FunctionValues[] values) throws IOException
    Helper utility for `FunctionValues`
    Returns:
      true if all of the specified `values` `FunctionValues.exists(int)` for the specified doc, else false.
    Throws:
      `IOException`

  - ### anyExists

    public static boolean anyExists(int doc, FunctionValues[] values) throws IOException
    Helper utility for `FunctionValues`
    Returns:
      true if any of the specified `values` `FunctionValues.exists(int)` for the specified doc, else false.
    Throws:
      `IOException`

  - ### allExists

    public static boolean allExists(int doc, FunctionValues values1, FunctionValues values2) throws IOException
    Equivalent to the `FunctionValues[]` method with the same name, but optimized for dealing with exactly 2 arguments.
    Returns:
      true if both of the specified `values` `FunctionValues.exists(int)` for the specified doc, else false.
    Throws:
      `IOException`
    See Also:
      - `anyExists(int,FunctionValues[])`

  - ### anyExists

    public static boolean anyExists(int doc, FunctionValues values1, FunctionValues values2) throws IOException
    Equivalent to the `FunctionValues[]` method with the same name, but optimized for dealing with exactly 2 arguments.
    Returns:
      true if either of the specified `values` `FunctionValues.exists(int)` for the specified doc, else false.
    Throws:
      `IOException`
    See Also:
      - `anyExists(int,FunctionValues[])`

  - ### description

    public static String description(String name, List<ValueSource> sources)

  - ### valsArr

    public static FunctionValues[] valsArr(List<ValueSource> sources, Map<Object,Object> fcontext, LeafReaderContext readerContext) throws IOException
    Throws:
      `IOException`

  - ### toString

    public static String toString(String name, FunctionValues[] valsArr, int doc) throws IOException
    Throws:
      `IOException`

  - ### createWeight

    public void createWeight(Map<Object,Object> context, IndexSearcher searcher) throws IOException
    Description copied from class: `ValueSource`
    Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context. The context object will be passed to getValues() where this info can be retrieved.
    Overrides:
      `createWeight` in class `ValueSource`
    Throws:
      `IOException`

  - ### hashCode

    public int hashCode()
    Specified by:
      `hashCode` in class `ValueSource`

  - ### equals

    public boolean equals(Object o)
    Specified by:
      `equals` in class `ValueSource`