EdgeToTemporalEdge.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.temporal.model.impl.functions.tpgm;
- import org.apache.flink.api.common.functions.MapFunction;
- import org.apache.flink.api.java.functions.FunctionAnnotation;
- import org.gradoop.common.model.api.entities.Edge;
- import org.gradoop.common.model.api.entities.EdgeFactory;
- import org.gradoop.common.model.impl.id.GradoopId;
- import org.gradoop.temporal.model.api.functions.TimeIntervalExtractor;
- import org.gradoop.temporal.model.impl.pojo.TemporalEdge;
- /**
- * Initializes a {@link TemporalEdge} from a {@link Edge} instance by setting either
- * default temporal information or, if a timeIntervalExtractor is given, by the extracted time information.
- *
- * @param <E> The (non-temporal) edge type.
- */
- @FunctionAnnotation.ForwardedFields("id;sourceId;targetId;label;properties;graphIds")
- public class EdgeToTemporalEdge<E extends Edge> implements MapFunction<E, TemporalEdge> {
- /**
- * The user defined timestamp extractor.
- */
- private TimeIntervalExtractor<E> timeIntervalExtractor;
- /**
- * Reuse this instance to reduce instantiations.
- */
- private TemporalEdge reuse;
- /**
- * Creates an instance of the TemporalEdgeFromNonTemporal map function. The temporal instance
- * will have default temporal information.
- *
- * @param elementFactory factory that is responsible for creating a temporal edge instance
- */
- public EdgeToTemporalEdge(EdgeFactory<TemporalEdge> elementFactory) {
- this.reuse = elementFactory.createEdge(GradoopId.NULL_VALUE, GradoopId.NULL_VALUE);
- }
- /**
- * Creates an instance of the TemporalEdgeFromNonTemporal map function. The temporal instance
- * will have valid times extracted from the non-temporal instance by the given timeIntervalExtractor.
- *
- * @param elementFactory factory that is responsible for creating a temporal edge instance
- * @param timeIntervalExtractor the extractor instance fetches the validFrom and validTo values
- */
- public EdgeToTemporalEdge(
- EdgeFactory<TemporalEdge> elementFactory,
- TimeIntervalExtractor<E> timeIntervalExtractor) {
- this(elementFactory);
- this.timeIntervalExtractor = timeIntervalExtractor;
- }
- @Override
- public TemporalEdge map(E value) throws Exception {
- reuse.setId(value.getId());
- reuse.setLabel(value.getLabel());
- reuse.setSourceId(value.getSourceId());
- reuse.setTargetId(value.getTargetId());
- reuse.setProperties(value.getProperties());
- reuse.setGraphIds(value.getGraphIds());
- if (timeIntervalExtractor != null) {
- reuse.setValidTime(timeIntervalExtractor.map(value));
- }
- return reuse;
- }
- }