HitsResultKeySelector.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.algorithms.gelly.hits.functions;

import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.graph.library.linkanalysis.HITS;
import org.gradoop.common.model.impl.id.GradoopId;

/**
 * Key selector for HITS.Result
 */
public class HitsResultKeySelector
  implements KeySelector<org.apache.flink.graph.library.linkanalysis.HITS.Result<GradoopId>,
  GradoopId> {

  /**
   * Selects GradoopId as key
   *
   * @param gradoopIdResult HITS Algorithm result
   * @return selects gradoop id
   * @throws Exception on failure
   */
  @Override
  public GradoopId getKey(HITS.Result<GradoopId> gradoopIdResult) throws Exception {
    return gradoopIdResult.getVertexId0();
  }
}