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.operator.base;
  
  import java.util.Optional;
  import org.apache.beam.sdk.extensions.euphoria.core.annotation.audience.Audience;
  import org.apache.beam.sdk.extensions.euphoria.core.client.functional.UnaryFunction;
  import org.apache.beam.sdk.extensions.euphoria.core.client.type.TypeAware;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** Operator working on some context. */
  @Audience(Audience.Type.INTERNAL)
  public abstract class ShuffleOperator<InputT, KeyT, OutputT> extends Operator<OutputT>
      implements TypeAware.Key<KeyT>, WindowAware<InputT> {
  
    private final UnaryFunction<InputT, KeyT> keyExtractor;
    private final @Nullable TypeDescriptor<KeyT> keyType;
    private final @Nullable Window<InputT> window;
  
    protected ShuffleOperator(
        @Nullable String name,
        @Nullable TypeDescriptor<OutputT> outputType,
        UnaryFunction<InputT, KeyT> keyExtractor,
        @Nullable TypeDescriptor<KeyT> keyType,
        @Nullable Window<InputT> windowing) {
  
      super(name, outputType);
      this.keyExtractor = keyExtractor;
      this.keyType = keyType;
      this.window = windowing;
    }
  
    public UnaryFunction<InputT, KeyT> getKeyExtractor() {
      return keyExtractor;
    }
  
    @Override
    public Optional<TypeDescriptor<KeyT>> getKeyType() {
      return Optional.ofNullable(keyType);
    }
  
    @Override
    public Optional<Window<InputT>> getWindow() {
      return Optional.ofNullable(window);
    }
  }
  