CCSSubgraphDecoder.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.fsm.transactional.tle.functions;

import org.apache.flink.api.common.functions.MapFunction;
import org.gradoop.flink.algorithms.fsm.transactional.CategoryCharacteristicSubgraphs;
import org.gradoop.flink.algorithms.fsm.transactional.tle.tuples.CCSSubgraph;
import org.gradoop.flink.model.impl.layouts.transactional.tuples.GraphTransaction;
import org.gradoop.flink.util.GradoopFlinkConfig;

/**
 * {@code FSM subgraph -> Gradoop graph transaction}
 */
public class CCSSubgraphDecoder extends SubgraphDecoder
  implements MapFunction<CCSSubgraph, GraphTransaction> {

  /**
   * Label of frequent subgraphs.
   */
  private static final String SUBGRAPH_LABEL = "CharacteristicSubgraph";

  /**
   * Constructor.
   *
   * @param config Gradoop Flink configuration
   */
  public CCSSubgraphDecoder(GradoopFlinkConfig config) {
    super(config);
  }

  @Override
  public GraphTransaction map(CCSSubgraph value) throws Exception {
    GraphTransaction transaction = createTransaction(value, SUBGRAPH_LABEL);

    transaction.getGraphHead().setProperty(
      CategoryCharacteristicSubgraphs.CATEGORY_KEY,
      value.getCategory()
    );

    return transaction;
  }

}