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.runners.dataflow.worker.util;
  
  import com.google.api.services.dataflow.model.Source;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.NativeReader;
  
  /** Utilities for working with Source Dataflow API definitions and {@link NativeReader} objects. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class CloudSourceUtils {
    /**
     * Returns a copy of the source with {@code baseSpecs} flattened into {@code spec}. On conflict
     * for a parameter name, values in {@code spec} override values in {@code baseSpecs}, and later
     * values in {@code baseSpecs} override earlier ones.
     */
    public static Source flattenBaseSpecs(Source source) {
      if (source.getBaseSpecs() == null) {
        return source;
      }
      Map<String, Object> params = new HashMap<>();
      for (Map<String, Object> baseSpec : source.getBaseSpecs()) {
        params.putAll(baseSpec);
      }
      params.putAll(source.getSpec());
  
      Source result = source.clone();
      result.setSpec(params);
      result.setBaseSpecs(null);
      return result;
    }
  }
  