org.apache.lucene.queries.function.valuesource

## Class LinearFloatFunction

- java.lang.Object
- - org.apache.lucene.queries.function.ValueSource
  - - org.apache.lucene.queries.function.valuesource.LinearFloatFunction

-     public class LinearFloatFunction
      extends ValueSource

  `LinearFloatFunction` implements a linear function over another `ValueSource`.
  Normally Used as an argument to a `FunctionQuery`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected float` | `intercept`
    `protected float` | `slope`
    `protected ValueSource` | `source`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `LinearFloatFunction(ValueSource source, float slope, float intercept)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `createWeight(Map 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()
    `boolean` | `equals(Object o)`
    `FunctionValues` | `getValues(Map 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

      `asDoubleValuesSource, asLongValuesSource, getSortField, newContext, toString`

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

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

- - ### Field Detail

    - #### source

          protected final ValueSource source

    - #### slope

          protected final float slope

    - #### intercept

          protected final float intercept

  - ### Constructor Detail

    - #### LinearFloatFunction

          public LinearFloatFunction(ValueSource source,
                                     float slope,
                                     float intercept)

  - ### Method Detail

    - #### description

          public String description()

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

    - #### getValues

          public FunctionValues getValues(Map 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()
      Specified by:
        `getValues` in class `ValueSource`
      Throws:
        `IOException`

    - #### createWeight

          public void createWeight(Map 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`

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