com.dataartisans.flink.cascading.runtime.coGroup.bufferJoin.BufferJoinKeyExtractor Maven / Gradle / Ivy
/*
* Copyright 2015 data Artisans GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.dataartisans.flink.cascading.runtime.coGroup.bufferJoin;
import cascading.tuple.Tuple;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.tuple.Tuple3;
public class BufferJoinKeyExtractor implements MapFunction> {
private int[] keyPos;
private Tuple3 outT;
private Tuple defaultKey = new Tuple(1);
public BufferJoinKeyExtractor(int inputId, int[] keyPos) {
this.keyPos = keyPos;
this.outT = new Tuple3<>(null, inputId, null);
}
@Override
public Tuple3 map(Tuple value) throws Exception {
if(keyPos.length > 0) {
outT.f0 = value.get(keyPos);
}
else {
outT.f0 = defaultKey;
}
outT.f2 = value;
return outT;
}
}