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.sql.meta.provider.datacatalog;
  
  import com.google.cloud.datacatalog.v1beta1.Entry;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Optional;
  import org.apache.beam.sdk.extensions.sql.meta.Table;
  
  /** {@link TableFactory} that uses the first applicable sub-{@link TableFactory}. */
  class ChainedTableFactory implements TableFactory {
  
    private final List<TableFactory> subTableFactories;
  
    public static ChainedTableFactory of(TableFactory... subTableFactories) {
      return new ChainedTableFactory(Arrays.asList(subTableFactories));
    }
  
    private ChainedTableFactory(List<TableFactory> subTableFactories) {
      this.subTableFactories = subTableFactories;
    }
  
    /** Creates a Beam SQL table description from a GCS fileset entry. */
    @Override
    public Optional<Table.Builder> tableBuilder(Entry entry) {
      for (TableFactory tableFactory : subTableFactories) {
        Optional<Table.Builder> tableBuilder = tableFactory.tableBuilder(entry);
        if (tableBuilder.isPresent()) {
          return tableBuilder;
        }
      }
      return Optional.empty();
    }
  }
  