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 com.google.cloud.datacatalog.v1beta1.GcsFilesetSpec;
  import java.util.List;
  import java.util.Optional;
  import org.apache.beam.sdk.extensions.sql.TableUtils;
  import org.apache.beam.sdk.extensions.sql.meta.Table;
  
  /** {@link TableFactory} that understands Data Catalog GCS entries. */
  class GcsTableFactory implements TableFactory {
  
    /** Creates a Beam SQL table description from a GCS fileset entry. */
    @Override
    public Optional<Table.Builder> tableBuilder(Entry entry) {
      if (!entry.hasGcsFilesetSpec()) {
        return Optional.empty();
      }
  
      GcsFilesetSpec gcsFilesetSpec = entry.getGcsFilesetSpec();
      List<String> filePatterns = gcsFilesetSpec.getFilePatternsList();
  
      // We support exactly one 'file_patterns' field and nothing else at the moment
      if (filePatterns.size() != 1) {
        throw new UnsupportedOperationException(
            "Unable to parse GCS entry '" + entry.getName() + "'");
      }
  
      String filePattern = filePatterns.get(0);
  
      if (!filePattern.startsWith("gs://")) {
        throw new UnsupportedOperationException(
            "Unsupported file pattern. "
                + "Only file patterns with 'gs://' schema are supported at the moment.");
      }
  
      return Optional.of(
          Table.builder()
              .type("text")
              .location(filePattern)
              .properties(TableUtils.emptyProperties())
              .comment(""));
    }
  }
  