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.arrow.driver.jdbc.utils;
  
  import static java.util.stream.IntStream.range;
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.Function;
  
  /**
   * Utility class for testing that require asserting that the values in a {@link ResultSet} are
   * expected.
   */
  public final class ResultSetTestUtils {
  
    /**
     * Checks that the values (rows and columns) in the provided {@link ResultSet} are expected.
     *
     * @param resultSet the {@code ResultSet} to assert.
     * @param expectedResults the rows and columns representing the only values the {@code resultSet}
     *     is expected to have.
     * @param <T> the type to be found in the expected results for the {@code resultSet}.
     * @throws SQLException if querying the {@code ResultSet} fails at some point unexpectedly.
     */
    public static <T> void testData(final ResultSet resultSet, final List<List<T>> expectedResults)
        throws SQLException {
      testData(
          resultSet,
          range(1, resultSet.getMetaData().getColumnCount() + 1).toArray(),
          expectedResults);
    }
  
    /**
     * Checks that the values (rows and columns) in the provided {@link ResultSet} are expected.
     *
     * @param resultSet the {@code ResultSet} to assert.
     * @param columnNames the column names to fetch in the {@code ResultSet} for comparison.
     * @param expectedResults the rows and columns representing the only values the {@code resultSet}
     *     is expected to have.
     * @param <T> the type to be found in the expected results for the {@code resultSet}.
     * @throws SQLException if querying the {@code ResultSet} fails at some point unexpectedly.
     */
    @SuppressWarnings("unchecked")
    public static <T> void testData(
        final ResultSet resultSet,
        final List<String> columnNames,
        final List<List<T>> expectedResults)
        throws SQLException {
      testData(
          resultSet,
          data -> {
            final List<T> columns = new ArrayList<>();
            for (final String columnName : columnNames) {
              try {
                columns.add((T) resultSet.getObject(columnName));
              } catch (final SQLException e) {
                throw new RuntimeException(e);
              }
            }
            return columns;
          },
          expectedResults);
    }
  
    /**
     * Checks that the values (rows and columns) in the provided {@link ResultSet} are expected.
     *
     * @param resultSet the {@code ResultSet} to assert.
     * @param columnIndices the column indices to fetch in the {@code ResultSet} for comparison.
     * @param expectedResults the rows and columns representing the only values the {@code resultSet}
     *     is expected to have.
     * @param <T> the type to be found in the expected results for the {@code resultSet}.
     * @throws SQLException if querying the {@code ResultSet} fails at some point unexpectedly.
     */
    @SuppressWarnings("unchecked")
    public static <T> void testData(
        final ResultSet resultSet, final int[] columnIndices, final List<List<T>> expectedResults)
        throws SQLException {
      testData(
          resultSet,
          data -> {
            final List<T> columns = new ArrayList<>();
            for (final int columnIndex : columnIndices) {
              try {
                columns.add((T) resultSet.getObject(columnIndex));
              } catch (final SQLException e) {
                throw new RuntimeException(e);
              }
            }
            return columns;
          },
          expectedResults);
    }
  
    /**
     * Checks that the values (rows and columns) in the provided {@link ResultSet} are expected.
     *
     * @param resultSet the {@code ResultSet} to assert.
     * @param dataConsumer the column indices to fetch in the {@code ResultSet} for comparison.
     * @param expectedResults the rows and columns representing the only values the {@code resultSet}
     *     is expected to have.
     * @param <T> the type to be found in the expected results for the {@code resultSet}.
     * @throws SQLException if querying the {@code ResultSet} fails at some point unexpectedly.
     */
    public static <T> void testData(
        final ResultSet resultSet,
        final Function<ResultSet, List<T>> dataConsumer,
        final List<List<T>> expectedResults)
        throws SQLException {
      final List<List<T>> actualResults = new ArrayList<>();
      while (resultSet.next()) {
        actualResults.add(dataConsumer.apply(resultSet));
      }
      assertThat(actualResults, is(expectedResults));
    }
  }
  