Package org.apache.storm.streams.operations

## Interface Function<T,​R>

- Type Parameters:
    `T` - the type of the input to the function
    `R` - the type of the result of the function
  All Superinterfaces:
    `Operation`, `Serializable`
  All Known Subinterfaces:
    `FlatMapFunction<T,​R>`, `PairFlatMapFunction<T,​K,​V>`, `PairFunction<T,​K,​V>`, `TupleValueMapper<T>`
  All Known Implementing Classes:
    `EvaluationCalc`, `EvaluationFunction`, `IdentityFunction`, `PairValueMapper`, `StreamInsertMapToPairFunction`, `StreamsScanTupleValueMapper`, `ValueMapper`, `ValuesMapper`

      public interface Function<T,​R>
      extends Operation

  Represents a function that accepts one argument and produces a result.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `R` | `apply​(T input)` | Applies this function to the given argument.

- - ### Method Detail

    - #### apply

          R apply​(T input)

      Applies this function to the given argument.
      Parameters:
        `input` - the input to the function
      Returns:
        the function result