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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.
   */
  package org.apache.beam.it.cassandra.matchers;
  
  import static org.apache.beam.it.truthmatchers.PipelineAsserts.assertThatRecords;
  
  import com.datastax.oss.driver.api.core.cql.ColumnDefinition;
  import com.datastax.oss.driver.api.core.cql.Row;
  import com.datastax.oss.driver.api.core.type.DataTypes;
  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 CassandraAsserts {
  
    /**
     * Convert Cassandra {@link Row} list to a list of maps.
     *
     * @param rows Rows to parse.
     * @return List of maps to use in {@link RecordsSubject}.
     */
    @SuppressWarnings("nullness")
    public static List<Map<String, Object>> cassandraRowsToRecords(Iterable<Row> rows) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
  
        for (Row row : rows) {
          Map<String, Object> converted = new HashMap<>();
          for (ColumnDefinition columnDefinition : row.getColumnDefinitions()) {
  
            Object value = null;
            if (columnDefinition.getType().equals(DataTypes.TEXT)) {
              value = row.getString(columnDefinition.getName());
            } else if (columnDefinition.getType().equals(DataTypes.INT)) {
              value = row.getInt(columnDefinition.getName());
            }
            converted.put(columnDefinition.getName().toString(), value);
          }
          records.add(converted);
        }
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting Cassandra Rows to Records", e);
      }
    }
  
    /**
     * Creates a {@link RecordsSubject} to assert information within a list of records.
     *
     * @param rows Records in Cassandra's {@link Row} format to use in the comparison.
     * @return Truth subject to chain assertions on.
     */
    public static RecordsSubject assertThatCassandraRecords(Iterable<Row> rows) {
      return assertThatRecords(cassandraRowsToRecords(rows));
    }
  }
  