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.translate;
  
  import org.apache.beam.sdk.extensions.euphoria.core.client.operator.Union;
  import org.apache.beam.sdk.transforms.Flatten;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionList;
  import org.apache.beam.sdk.values.TypeDescriptor;
  
  /**
   * Euphoria to Beam translation of {@link Union} operator.
   *
   * @deprecated Use Java SDK directly, Euphoria is scheduled for removal in a future release.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  @Deprecated
  public class UnionTranslator<InputT> implements OperatorTranslator<InputT, InputT, Union<InputT>> {
  
    @Override
    public PCollection<InputT> translate(Union<InputT> operator, PCollectionList<InputT> inputs) {
      final TypeDescriptor<InputT> outputType = operator.getOutputType().orElse(null);
      return operator
          .getName()
          .map(name -> inputs.apply(name, Flatten.pCollections()).setTypeDescriptor(outputType))
          .orElseGet(() -> inputs.apply(Flatten.pCollections()).setTypeDescriptor(outputType));
    }
  }
  