org.apache.flink.api.java.operators.translation

Class TwoKeyExtractingMapper<T,K1,K2>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichMapFunction<T,Tuple3<K1,K2,T>>

org.apache.flink.api.java.operators.translation.TwoKeyExtractingMapper<T,K1,K2>

Type Parameters:

T - type of the values

K1 - type of the first key

K2 - type of the second key

All Implemented Interfaces:

Serializable, Function, MapFunction<T,Tuple3<K1,K2,T>>, RichFunction

@Internal
public final class TwoKeyExtractingMapper<T,K1,K2>
extends RichMapFunction<T,Tuple3<K1,K2,T>>

Mapper that extracts two keys of a value.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TwoKeyExtractingMapper(KeySelector<T,K1> keySelector1, KeySelector<T,K2> keySelector2)

Method Summary

Modifier and Type	Method and Description
Tuple3<K1,K2,T>	map(T value) The mapping method.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TwoKeyExtractingMapper

public TwoKeyExtractingMapper(KeySelector<T,K1> keySelector1,
                              KeySelector<T,K2> keySelector2)

Method Detail

map

public Tuple3<K1,K2,T> map(T value)
                    throws Exception

Description copied from interface: MapFunction

The mapping method. Takes an element from the input data set and transforms it into exactly one element.

Specified by:

map in interface MapFunction<T,Tuple3<K1,K2,T>>

Specified by:

map in class RichMapFunction<T,Tuple3<K1,K2,T>>

Parameters:

value - The input value.

Returns:

The transformed value

Throws:

Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.