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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.sdk.extensions.sql.meta.provider.test;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.extensions.sql.impl.BeamTableStatistics;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.testing.TestStream;
  import org.apache.beam.sdk.values.PBegin;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  import org.apache.beam.sdk.values.TimestampedValue;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Pair;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  
  /** A mocked unbounded table. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class TestUnboundedTable extends TestTable {
    /** rows flow out from this table with the specified watermark instant. */
    private final List<Pair<Duration, List<Row>>> timestampedRows = new ArrayList<>();
    /** specify the index of column in the row which stands for the event time field. */
    private int timestampField;
  
    private BeamTableStatistics statistics = BeamTableStatistics.UNBOUNDED_UNKNOWN;
  
    private TestUnboundedTable(Schema beamSchema) {
      super(beamSchema);
    }
  
    /**
     * Convenient way to build a mocked unbounded table.
     *
     * <p>e.g.
     *
     * <pre>{@code
     * TestUnboundedTable
     *   .of(Types.BIGINT, "order_id",
     *       Types.INTEGER, "site_id",
     *       Types.DOUBLE, "price",
     *       Types.TIMESTAMP, "order_time")
     * }</pre>
     */
    public static TestUnboundedTable of(final Object... args) {
      return new TestUnboundedTable(TestTableUtils.buildBeamSqlSchema(args));
    }
  
    public TestUnboundedTable setStatistics(BeamTableStatistics statistics) {
      this.statistics = statistics;
      return this;
    }
  
    @Override
    public BeamTableStatistics getTableStatistics(PipelineOptions options) {
      return this.statistics;
    }
  
    public TestUnboundedTable timestampColumnIndex(int idx) {
      this.timestampField = idx;
      return this;
    }
  
    @Override
    public PCollection.IsBounded isBounded() {
      return PCollection.IsBounded.UNBOUNDED;
    }
  
    /**
     * Add rows to the builder.
     *
     * <p>Sample usage:
     *
     * <pre>{@code
     * addRows(
     *   duration,      -- duration which stands for the corresponding watermark instant
     *   1, 3, "james", -- first row
     *   2, 5, "bond"   -- second row
     *   ...
     * )
     * }</pre>
     */
    public TestUnboundedTable addRows(Duration duration, Object... args) {
      List<Row> rows = TestTableUtils.buildRows(getSchema(), Arrays.asList(args));
      // record the watermark + rows
      this.timestampedRows.add(Pair.of(duration, rows));
      return this;
    }
  
    @Override
    public PCollection<Row> buildIOReader(PBegin begin) {
      TestStream.Builder<Row> values = TestStream.create(schema);
  
      for (Pair<Duration, List<Row>> pair : timestampedRows) {
        values = values.advanceWatermarkTo(new Instant(0).plus(pair.getKey()));
        for (int i = 0; i < pair.getValue().size(); i++) {
          values =
              values.addElements(
                  TimestampedValue.of(
                      pair.getValue().get(i),
                      new Instant(pair.getValue().get(i).getDateTime(timestampField))));
        }
      }
  
      return begin
          .apply(
              "MockedUnboundedTable_" + COUNTER.incrementAndGet(),
              values.advanceWatermarkToInfinity())
          .setRowSchema(getSchema());
    }
  }
  