Tuple2ToWithCount.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.tuple;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.functions.FunctionAnnotation;
import org.apache.flink.api.java.tuple.Tuple2;
import org.gradoop.flink.model.impl.tuples.WithCount;

/**
 * {@code (object, count) -> WithCount(object, count)}
 *
 * @param <T> object type
 */
@FunctionAnnotation.ForwardedFields("f0;f1")
public class Tuple2ToWithCount<T> implements MapFunction<Tuple2<T, Long>, WithCount<T>> {
  /**
   * Reduce object instantiations
   */
  private final WithCount<T> reuseTuple = new WithCount<>();

  @Override
  public WithCount<T> map(Tuple2<T, Long> value) throws Exception {
    reuseTuple.setObject(value.f0);
    reuseTuple.setCount(value.f1);
    return reuseTuple;
  }
}