TransactionVertices.java

/*
 * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
 *
 * 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 org.gradoop.flink.model.impl.functions.epgm;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.util.Collector;
import org.gradoop.common.model.impl.pojo.EPGMEdge;
import org.gradoop.common.model.impl.pojo.EPGMGraphHead;
import org.gradoop.common.model.impl.pojo.EPGMVertex;

import java.util.Set;

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

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