TransactionVertices.java

  1. /*
  2.  * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  3.  *
  4.  * Licensed under the Apache License, Version 2.0 (the "License");
  5.  * you may not use this file except in compliance with the License.
  6.  * You may obtain a copy of the License at
  7.  *
  8.  *     http://www.apache.org/licenses/LICENSE-2.0
  9.  *
  10.  * Unless required by applicable law or agreed to in writing, software
  11.  * distributed under the License is distributed on an "AS IS" BASIS,
  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13.  * See the License for the specific language governing permissions and
  14.  * limitations under the License.
  15.  */
  16. package org.gradoop.flink.model.impl.functions.epgm;

  17. import org.apache.flink.api.common.functions.FlatMapFunction;
  18. import org.apache.flink.api.java.tuple.Tuple3;
  19. import org.apache.flink.util.Collector;
  20. import org.gradoop.common.model.impl.pojo.EPGMEdge;
  21. import org.gradoop.common.model.impl.pojo.EPGMGraphHead;
  22. import org.gradoop.common.model.impl.pojo.EPGMVertex;

  23. import java.util.Set;

  24. /**
  25.  * {@code (graphHead, {vertex,..}, {edge,..}) => vertex,..}
  26.  *
  27.  * @param <T> tuple type
  28.  */
  29. public class TransactionVertices<T extends Tuple3<EPGMGraphHead, Set<EPGMVertex>, Set<EPGMEdge>>> implements
  30.   FlatMapFunction<T, EPGMVertex> {

  31.   @Override
  32.   public void flatMap(T graphTriple, Collector<EPGMVertex> collector) throws Exception {
  33.     graphTriple.f1.forEach(collector::collect);
  34.   }
  35. }