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

# Class PairValueMapper<K,V>

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

Type Parameters:
  `K` - the key type
  `V` - the value type

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
  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

  Modifier and Type
  Method
  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 Details

  - ### 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 Details

  - ### 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<K,V>`
    Parameters:
      `input` - the input to the function
    Returns:
      the function result