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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.cassandra.index.sai.disk.v1.bitpack;
  
  import java.util.function.LongFunction;
  
  import org.junit.Test;
  
  import org.apache.cassandra.index.sai.disk.format.IndexComponent;
  import org.apache.cassandra.index.sai.disk.format.IndexDescriptor;
  import org.apache.cassandra.index.sai.disk.v1.LongArray;
  import org.apache.cassandra.index.sai.disk.v1.MetadataSource;
  import org.apache.cassandra.index.sai.disk.v1.MetadataWriter;
  import org.apache.cassandra.index.sai.utils.SAIRandomizedTester;
  import org.apache.cassandra.io.util.FileHandle;
  
  import static org.junit.Assert.assertEquals;
  
  public class NumericValuesTest extends SAIRandomizedTester
  {
      @Test
      public void testMonotonic() throws Exception
      {
          doTest(true);
      }
  
      @Test
      public void testRegular() throws Exception
      {
          doTest(false);
      }
  
      @Test
      public void testRepeatsMonotonicValues() throws Exception
      {
          testRepeatedNumericValues(true);
      }
  
      @Test
      public void testRepeatsRegularValues() throws Exception
      {
          testRepeatedNumericValues(false);
      }
  
      private void testRepeatedNumericValues(boolean monotonic) throws Exception
      {
          int length = 64_000;
          final IndexDescriptor indexDescriptor = newIndexDescriptor();
          writeTokens(monotonic, indexDescriptor, new long[length], prev -> 1000L);
  
          final MetadataSource source = MetadataSource.loadGroupMetadata(indexDescriptor);
  
          NumericValuesMeta tokensMeta = new NumericValuesMeta(source.get(indexDescriptor.componentName(IndexComponent.ROW_TO_TOKEN)));
  
          try (FileHandle fileHandle = indexDescriptor.createPerSSTableFileHandle(IndexComponent.ROW_TO_TOKEN, null);
               LongArray reader = monotonic ? new MonotonicBlockPackedReader(fileHandle, tokensMeta).open()
                                            : new BlockPackedReader(fileHandle, tokensMeta).open())
          {
              for (int x = 0; x < length; x++)
              {
                  assertEquals(reader.get(x), 1000);
              }
          }
      }
  
      private void doTest(boolean monotonic) throws Exception
      {
          final long[] array = new long[64_000];
          final IndexDescriptor indexDescriptor = newIndexDescriptor();
          writeTokens(monotonic, indexDescriptor, array, prev -> monotonic ? prev + nextInt(100) : nextLong(0, Long.MAX_VALUE));
  
          final MetadataSource source = MetadataSource.loadGroupMetadata(indexDescriptor);
          NumericValuesMeta tokensMeta = new NumericValuesMeta(source.get(indexDescriptor.componentName(IndexComponent.ROW_TO_TOKEN)));
  
          try (FileHandle fileHandle = indexDescriptor.createPerSSTableFileHandle(IndexComponent.ROW_TO_TOKEN, null);
               LongArray reader = (monotonic ? new MonotonicBlockPackedReader(fileHandle, tokensMeta)
                                             : new BlockPackedReader(fileHandle, tokensMeta)).open())
          {
              assertEquals(array.length, reader.length());
  
              for (int x = 0; x < array.length; x++)
              {
                  assertEquals(array[x], reader.get(x));
              }
          }
      }
  
      private void writeTokens(boolean monotonic, IndexDescriptor indexDescriptor, long[] array, LongFunction<Long> generator) throws Exception
      {
          final int blockSize = 1 << nextInt(8, 15);
  
          long current = 0;
          try (MetadataWriter metadataWriter = new MetadataWriter(indexDescriptor.openPerSSTableOutput(IndexComponent.GROUP_META));
               final NumericValuesWriter numericWriter = new NumericValuesWriter(indexDescriptor,
                                                                                 IndexComponent.ROW_TO_TOKEN,
                                                                                 metadataWriter,
                                                                                 monotonic,
                                                                                 blockSize))
          {
              for (int x = 0; x < array.length; x++)
              {
                  current = generator.apply(current);
  
                  numericWriter.add(current);
  
                  array[x] = current;
              }
          }
      }
  }
  