content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 accord.utils;
  
  import java.util.function.BiFunction;
  import java.util.function.Function;
  
  public interface MapReduce<I, O> extends Function<I, O>, Reduce<O, O>
  {
      // TODO (desired, safety): ensure mutual exclusivity when calling each of these methods
      @Override
      O apply(I in);
      O reduce(O o1, O o2);
  
      static <I, O> MapReduce<I, O> of(Function<I, O> map, BiFunction<O, O, O> reduce)
      {
          return new MapReduce<I, O>()
          {
              @Override
              public O apply(I in)
              {
                  return map.apply(in);
              }
  
              @Override
              public O reduce(O o1, O o2)
              {
                  return reduce.apply(o1, o2);
              }
          };
      }
  }
  