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[dbs-leipzig#1433] Handle edges between retained vertices.
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51 changes: 51 additions & 0 deletions
51
...radoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithId.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * 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.model.impl.operators.keyedgrouping.functions; | ||
|
|
||
| import org.apache.flink.api.java.tuple.Tuple; | ||
| import org.gradoop.common.model.api.entities.Edge; | ||
| import org.gradoop.flink.model.api.functions.AggregateFunction; | ||
| import org.gradoop.flink.model.api.functions.KeyFunction; | ||
|
|
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| import java.util.List; | ||
|
|
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| /** | ||
| * Build a tuple-based representation of edges for grouping with an additional source ID field at position | ||
| * {@value GroupingConstants#EDGE_TUPLE_ID}. All other fields will be shifted by | ||
| * {@value GroupingConstants#EDGE_RETENTION_OFFSET}. | ||
| * | ||
| * @param <E> The edge type. | ||
| */ | ||
| public class BuildTuplesFromEdgesWithId<E extends Edge> extends BuildTuplesFromEdges<E> { | ||
|
|
||
| /** | ||
| * Initialize this function, setting the grouping keys and aggregate functions. | ||
| * | ||
| * @param keys The edge grouping keys. | ||
| * @param aggregateFunctions The edge aggregate functions. | ||
| */ | ||
| public BuildTuplesFromEdgesWithId(List<KeyFunction<E, ?>> keys, | ||
| List<AggregateFunction> aggregateFunctions) { | ||
| super(keys, aggregateFunctions, GroupingConstants.EDGE_RETENTION_OFFSET); | ||
| } | ||
|
|
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| @Override | ||
| public Tuple map(E element) throws Exception { | ||
| final Tuple tuple = super.map(element); | ||
| tuple.setField(element.getId(), GroupingConstants.EDGE_TUPLE_ID); | ||
| return tuple; | ||
| } | ||
| } |
42 changes: 42 additions & 0 deletions
42
...radoop/flink/model/impl/operators/keyedgrouping/functions/CreateElementMappingToSelf.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.model.impl.operators.keyedgrouping.functions; | ||
|
|
||
| import org.apache.flink.api.common.functions.MapFunction; | ||
| import org.apache.flink.api.java.tuple.Tuple2; | ||
| import org.gradoop.common.model.api.entities.Identifiable; | ||
| import org.gradoop.common.model.impl.id.GradoopId; | ||
|
|
||
| /** | ||
| * Create a mapping (in the form of a {@link Tuple2}) from the ID of an element to itself. | ||
| * | ||
| * @param <E> The element type. | ||
| */ | ||
| public class CreateElementMappingToSelf<E extends Identifiable> | ||
| implements MapFunction<E, Tuple2<GradoopId, GradoopId>> { | ||
|
|
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| /** | ||
| * Reduce object instantiations. | ||
| */ | ||
| private final Tuple2<GradoopId, GradoopId> reuse = new Tuple2<>(); | ||
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| @Override | ||
| public Tuple2<GradoopId, GradoopId> map(E element) { | ||
| reuse.f0 = element.getId(); | ||
| reuse.f1 = element.getId(); | ||
| return reuse; | ||
| } | ||
| } |
33 changes: 33 additions & 0 deletions
33
...va/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/FilterEdgesToGroup.java
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|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| * 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.model.impl.operators.keyedgrouping.functions; | ||
|
|
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| import org.apache.flink.api.common.functions.FilterFunction; | ||
| import org.apache.flink.api.java.tuple.Tuple; | ||
| import org.gradoop.common.model.impl.id.GradoopId; | ||
|
|
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| /** | ||
| * A filter function accepting all edges that were not marked for retention. | ||
| * | ||
| * @param <T> The edge tuple type. | ||
| */ | ||
| public class FilterEdgesToGroup<T extends Tuple> implements FilterFunction<T> { | ||
|
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| @Override | ||
| public boolean filter(T tuple) { | ||
| return tuple.getField(GroupingConstants.EDGE_TUPLE_ID).equals(GradoopId.NULL_VALUE); | ||
| } | ||
| } |
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37 changes: 37 additions & 0 deletions
37
...a/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDs.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /* | ||
| * 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.model.impl.operators.keyedgrouping.functions; | ||
|
|
||
| import org.apache.flink.api.common.functions.FlatMapFunction; | ||
| import org.apache.flink.api.java.tuple.Tuple; | ||
| import org.apache.flink.util.Collector; | ||
| import org.gradoop.common.model.impl.id.GradoopId; | ||
|
|
||
| /** | ||
| * Picks the ID from a tuple if that ID is not {@link GradoopId#NULL_VALUE}. | ||
| * | ||
| * @param <T> The input tuple type. | ||
| */ | ||
| public class PickRetainedEdgeIDs<T extends Tuple> implements FlatMapFunction<T, GradoopId> { | ||
|
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| @Override | ||
| public void flatMap(T tuple, Collector<GradoopId> collector) { | ||
| final GradoopId id = tuple.getField(GroupingConstants.EDGE_TUPLE_ID); | ||
| if (!id.equals(GradoopId.NULL_VALUE)) { | ||
| collector.collect(id); | ||
| } | ||
| } | ||
| } |
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