org.apache.storm.streams.operations.mappers

## Class PairValueMapper<K,V>

- java.lang.Object
- - org.apache.storm.streams.operations.mappers.PairValueMapper<K,V>

- All Implemented Interfaces:
    Serializable, Function<Tuple,Pair<K,V>>, TupleValueMapper<Pair<K,V>>, Operation, PairFunction<Tuple,K,V>

      public class PairValueMapper<K,V>
      extends Object
      implements TupleValueMapper<Pair<K,V>>, PairFunction<Tuple,K,V>

  Extracts a typed key-value pair from a tuple.

  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `PairValueMapper(int keyIndex, int valueIndex)` Constructs a new `PairValueMapper` that constructs a pair from a tuple based on the key and value index.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Pair<K,V>` | `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 Detail

    - #### PairValueMapper

          public PairValueMapper(int keyIndex,
                                 int valueIndex)

      Constructs a new `PairValueMapper` that constructs a pair from a tuple based on the key and value index.

      Parameters:
        `keyIndex` - the key index
        `valueIndex` - the value index

  - ### Method Detail

    - #### apply

          public Pair<K,V> apply(Tuple input)

      Description copied from interface: `Function`

      Applies this function to the given argument.

      Specified by:
        `apply` in interface `Function<Tuple,Pair<K,V>>`
      Parameters:
        `input` - the input to the function
      Returns:
        the function result

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