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.cassandra.index.sai.disk.v1;
  
  import java.util.Arrays;
  
  import org.junit.Test;
  
  import org.apache.cassandra.index.sai.utils.SAIRandomizedTester;
  import org.apache.lucene.util.IntroSorter;
  import org.apache.lucene.util.Sorter;
  
  import static org.junit.Assert.assertArrayEquals;
  
  public class SorterTest
  {
      @Test
      public void test()
      {
          final int[] array = new int[100];
          for (int x=0; x < array.length; x++)
          {
              array[x] = x;
          }
  
          int[] sortedArray = Arrays.copyOf(array, array.length);
  
          SAIRandomizedTester.shuffle(array);
  
          final Sorter sorter = new IntroSorter() {
              int pivotDoc;
  
              @Override
              protected void swap(int i, int j) {
                  int o = array[i];
                  array[i] = array[j];
                  array[j] = o;
              }
  
              @Override
              protected void setPivot(int i)
              {
                  pivotDoc = array[i];
              }
  
              @Override
              protected int comparePivot(int j) {
                  return pivotDoc - array[j];
              }
          };
  
          sorter.sort(0, array.length);
  
          assertArrayEquals(sortedArray, array);
      }
  }
  