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

Class KeyExtractingMapper<T,K>

java.lang.Object

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

org.apache.flink.api.common.functions.RichMapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

org.apache.flink.api.java.operators.translation.KeyExtractingMapper<T,K>

Type Parameters:

T - type of value

K - type of key

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.MapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>, org.apache.flink.api.common.functions.RichFunction

@Internal
public final class KeyExtractingMapper<T,K>
extends org.apache.flink.api.common.functions.RichMapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

Mapper that extracts keys.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
KeyExtractingMapper(org.apache.flink.api.java.functions.KeySelector<T,K> keySelector)

Method Summary

Modifier and Type	Method	Description
org.apache.flink.api.java.tuple.Tuple2<K,T>	map(T value)

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

KeyExtractingMapper

public KeyExtractingMapper(org.apache.flink.api.java.functions.KeySelector<T,K> keySelector)

Method Detail

map

public org.apache.flink.api.java.tuple.Tuple2<K,T> map(T value)
                                                      throws Exception

Specified by:

map in interface org.apache.flink.api.common.functions.MapFunction<T,K>

Specified by:

map in class org.apache.flink.api.common.functions.RichMapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

Throws:

Exception