org.apache.storm.streams.operations.mappers

Class ValueMapper<T>

java.lang.Object

org.apache.storm.streams.operations.mappers.ValueMapper<T>

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 and Description
ValueMapper(int index) Constructs a new ValueMapper that extracts the value at index ‘i’ from a tuple.

Method Summary

Modifier and Type	Method and 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 Detail

ValueMapper

public ValueMapper(int index)

Constructs a new ValueMapper that extracts the value at index ‘i’ from a tuple.

Parameters:

index - the index

Method Detail

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