Package org.apache.storm.streams.operations.mappers

# Class ValueMapper<T>

java.lang.Object
org.apache.storm.streams.operations.mappers.ValueMapper<T>

Type Parameters:
  `T` - the value type

All Implemented Interfaces:
  `Serializable`, `Function<Tuple,T>`, `TupleValueMapper<T>`, `Operation`

public class ValueMapper<T> extends Object implements TupleValueMapper<T>
Extracts a single typed value from a tuple.

See Also:
  - Serialized Form

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ValueMapper(int index)`
  Constructs a new `ValueMapper` that extracts the value at index 'i' from a tuple.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `T`
  `apply(Tuple input)`
  Applies this function to the given argument.

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

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### ValueMapper

    public ValueMapper(int index)
    Constructs a new `ValueMapper` that extracts the value at index 'i' from a tuple.
    Parameters:
      `index` - the index

- ## Method Details

  - ### apply

    public T apply(Tuple input)
    Description copied from interface: `Function`
    Applies this function to the given argument.
    Specified by:
      `apply` in interface `Function<Tuple,T>`
    Parameters:
      `input` - the input to the function
    Returns:
      the function result