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   * 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.
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  package org.apache.beam.it.gcp.bigtable.matchers;
  
  import static org.apache.beam.it.truthmatchers.PipelineAsserts.assertThatRecords;
  
  import com.google.cloud.bigtable.data.v2.models.Row;
  import com.google.cloud.bigtable.data.v2.models.RowCell;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.it.truthmatchers.RecordsSubject;
  
  public class BigtableAsserts {
  
    /**
     * Convert Bigtable {@link Row} to a list of maps.
     *
     * @param rows Bigtable rows to parse.
     * @param family Bigtable column family to parse from.
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> bigtableRowsToRecords(Iterable<Row> rows, String family) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
  
        for (Row row : rows) {
          Map<String, Object> converted = new HashMap<>();
          for (RowCell cell : row.getCells(family)) {
  
            String col = cell.getQualifier().toStringUtf8();
            String val = cell.getValue().toStringUtf8();
            converted.put(col, val);
          }
          records.add(converted);
        }
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting Bigtable Row to Map", e);
      }
    }
  
    /**
     * Creates a {@link RecordsSubject} to assert information within a list of records.
     *
     * @param rows Records in Bigtable's {@link Row} format to use in the comparison.
     * @param family The column family to read records from.
     * @return Truth subject to chain assertions.
     */
    public static RecordsSubject assertThatBigtableRecords(Iterable<Row> rows, String family) {
      return assertThatRecords(bigtableRowsToRecords(rows, family));
    }
  }
  