FloatFieldSource (Lucene 10.5.1 queries API)
Description: declaration: package: org.apache.lucene.queries.function.valuesource, class: FloatFieldSource

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

# Class FloatFieldSource

java.lang.Object
org.apache.lucene.queries.function.ValueSource
org.apache.lucene.queries.function.valuesource.FieldCacheSource
org.apache.lucene.queries.function.valuesource.FloatFieldSource

Direct Known Subclasses:
  `MultiValuedFloatFieldSource`

public class FloatFieldSource extends FieldCacheSource
Obtains float field values from `LeafReader.getNumericDocValues(java.lang.String)` and makes those values available as other numeric types, casting as needed.

- ## Field Summary

  ### Fields inherited from class org.apache.lucene.queries.function.valuesource.FieldCacheSource

  `field`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FloatFieldSource(String field)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `String`
  `description()`
  description of field, used in explain()
  `boolean`
  `equals(Object o)`
  `protected NumericDocValues`
  `getNumericDocValues(Map<Object,Object> context, LeafReaderContext readerContext)`
  `SortField`
  `getSortField(boolean reverse)`
  EXPERIMENTAL: This method is subject to change.
  `FunctionValues`
  `getValues(Map<Object,Object> context, LeafReaderContext readerContext)`
  Gets the values for this reader and the context that was previously passed to createWeight().
  `int`
  `hashCode()`

  ### Methods inherited from class org.apache.lucene.queries.function.valuesource.FieldCacheSource

  `getField`

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

  `asDoubleValuesSource, asLongValuesSource, createWeight, fromDoubleValuesSource, newContext, toString`

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

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

- ## Constructor Details

  - ### FloatFieldSource

    public FloatFieldSource(String field)

- ## Method Details

  - ### description

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

  - ### getSortField

    public SortField getSortField(boolean reverse)
    Description copied from class: `ValueSource`
    EXPERIMENTAL: This method is subject to change.

    Get the SortField for this ValueSource. Uses the `ValueSource.getValues(java.util.Map, org.apache.lucene.index.LeafReaderContext)` to populate the SortField.

    Overrides:
      `getSortField` in class `ValueSource`
    Parameters:
      `reverse` - true if this is a reverse sort.
    Returns:
      The `SortField` for the ValueSource

  - ### getValues

    public FunctionValues getValues(Map<Object,Object> context, LeafReaderContext readerContext) throws IOException
    Description copied from class: `ValueSource`
    Gets the values for this reader and the context that was previously passed to createWeight(). The values must be consumed in a forward docID manner, and you must call this method again to iterate through the values again.
    Specified by:
      `getValues` in class `ValueSource`
    Throws:
      `IOException`

  - ### getNumericDocValues

    protected NumericDocValues getNumericDocValues(Map<Object,Object> context, LeafReaderContext readerContext) throws IOException
    Throws:
      `IOException`

  - ### equals

    public boolean equals(Object o)
    Overrides:
      `equals` in class `FieldCacheSource`

  - ### hashCode

    public int hashCode()
    Overrides:
      `hashCode` in class `FieldCacheSource`