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.io.Serializable;
  import java.util.Optional;
  import org.apache.beam.sdk.extensions.euphoria.core.annotation.audience.Audience;
  import org.apache.beam.sdk.extensions.euphoria.core.client.type.TypeAware;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** An operator base class. All operators extends this class. */
  @Audience(Audience.Type.INTERNAL)
  public abstract class Operator<OutputT> implements Serializable, TypeAware.Output<OutputT> {
  
    /** Name of the operator. */
    private final @Nullable String name;
  
    /** The type of output elements. */
    private final transient @Nullable TypeDescriptor<OutputT> outputType;
  
    protected Operator(@Nullable String name, @Nullable TypeDescriptor<OutputT> outputType) {
      this.name = name;
      this.outputType = outputType;
    }
  
    /**
     * Returns user provided name of the operator.
     *
     * @return maybe name
     */
    public Optional<String> getName() {
      return Optional.ofNullable(name);
    }
  
    @Override
    public Optional<TypeDescriptor<OutputT>> getOutputType() {
      return Optional.ofNullable(outputType);
    }
  
    @Override
    public String toString() {
      return this.getClass().getSimpleName() + " operator{" + "name='" + name + '\'' + '}';
    }
  }
  