PairValueMapper (Storm 2.7.1 API)

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

All Methods Instance Methods Concrete Methods
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 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<K,V>
    
    Parameters:
    
    input - the input to the function
    
    Returns:
    
    the function result