ExpandGraphsToIdSet.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.graphcontainment;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.functions.FunctionAnnotation;
import org.gradoop.common.model.impl.pojo.EPGMGraphElement;
import org.gradoop.common.model.impl.id.GradoopIdSet;

/**
 * Maps an element to a GradoopIdSet of all graph ids the element is contained in.
 * <p>
 * {@code graph-element -> {graph id 1, graph id 2, ..., graph id n}}
 *
 * @param <GE> EPGM graph element (i.e. vertex / edge)
 */
@FunctionAnnotation.ForwardedFields("graphIds->*")
public class ExpandGraphsToIdSet<GE extends EPGMGraphElement>
  implements MapFunction<GE, GradoopIdSet> {

  @Override
  public GradoopIdSet map(GE ge) {
    return ge.getGraphIds();
  }
}