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

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