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CollectGradoopIds.java
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CollectGradoopIds.java
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/*
* Copyright © 2014 - 2019 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.algorithms.btgs.functions;
import org.apache.flink.api.common.functions.GroupCombineFunction;
import org.apache.flink.api.common.functions.GroupReduceFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.util.Collector;
import org.gradoop.common.model.impl.id.GradoopId;
import org.gradoop.common.model.impl.id.GradoopIdSet;
/**
* {@code (a,b),(a,c) => (a,{b,c})}<br>
* {@code (a,{b,c}),(a,{d,e}) => (a,{b,c,d,e})}
*/
public class CollectGradoopIds implements
GroupCombineFunction
<Tuple2<GradoopId, GradoopIdSet>, Tuple2<GradoopId, GradoopIdSet>>,
GroupReduceFunction
<Tuple2<GradoopId, GradoopId>, Tuple2<GradoopId, GradoopIdSet>> {
@Override
public void reduce(Iterable<Tuple2<GradoopId, GradoopId>> mappings,
Collector<Tuple2<GradoopId, GradoopIdSet>> collector) throws Exception {
boolean first = true;
GradoopId vertexId = null;
GradoopIdSet btgIds = new GradoopIdSet();
for (Tuple2<GradoopId, GradoopId> pair : mappings) {
if (first) {
vertexId = pair.f0;
first = false;
}
btgIds.add(pair.f1);
}
collector.collect(new Tuple2<>(vertexId, btgIds));
}
@Override
public void combine(Iterable<Tuple2<GradoopId, GradoopIdSet>> mappings,
Collector<Tuple2<GradoopId, GradoopIdSet>> collector) {
boolean first = true;
GradoopId vertexId = null;
GradoopIdSet btgIds = null;
for (Tuple2<GradoopId, GradoopIdSet> pair : mappings) {
if (first) {
vertexId = pair.f0;
btgIds = pair.f1;
first = false;
}
btgIds.addAll(pair.f1);
}
collector.collect(new Tuple2<>(vertexId, btgIds));
}
}