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ReduceSameTypeOperation xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.giraph.reducers;
19  
20  import org.apache.hadoop.io.Writable;
21  
22  /**
23   * ReduceOperation object when single object being reduced is of
24   * same type as reduced value.
25   *
26   * @param <R> Reduced object type.
27   */
28  public abstract class ReduceSameTypeOperation<R extends Writable>
29      implements ReduceOperation<R, R> {
30    @Override
31    public final R reduceMerge(R curValue, R valueToReduce) {
32      return reduce(curValue, valueToReduce);
33    }
34  }