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 org.apache.beam.sdk.extensions.euphoria.core.client.functional;
  
  import java.util.stream.Stream;
  import org.apache.beam.sdk.extensions.euphoria.core.annotation.audience.Audience;
  import org.apache.beam.sdk.extensions.euphoria.core.client.io.Collector;
  
  /**
   * Reduce function reducing iterable of elements into multiple elements (of possibly different
   * type).
   *
   * @deprecated Use Java SDK directly, Euphoria is scheduled for removal in a future release.
   */
  @Audience(Audience.Type.CLIENT)
  @FunctionalInterface
  @Deprecated
  public interface ReduceFunctor<InputT, OutputT> extends UnaryFunctor<Stream<InputT>, OutputT> {
  
    /**
     * Create reduce functor from combinable function.
     *
     * @param combinableFunction combinable function
     * @param <V> value type
     * @return reduce functor
     */
    static <V> ReduceFunctor<V, V> of(CombinableReduceFunction<V> combinableFunction) {
  
      return new ReduceFunctor<V, V>() {
  
        @Override
        public boolean isCombinable() {
          return true;
        }
  
        @Override
        public void apply(Stream<V> elem, Collector<V> context) {
          context.collect(combinableFunction.apply(elem));
        }
      };
    }
  
    /**
     * Is this a commutative associative function with single final output?
     *
     * @return {@code true} if this is combinable function. NOTE: user code should not need to
     *     override this
     */
    default boolean isCombinable() {
      return false;
    }
  }
  