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.harry.gen;
  
  import org.apache.cassandra.harry.MagicConstants;
  
  public class IndexGenerators
  {
      private final ValueGenerators valueGenerators;
      public final Generator<Integer> pkIdxGen;
      public final Generator<Integer> ckIdxGen;
      public final Generator<Integer>[] regularIdxGens;
      public final Generator<Integer>[] staticIdxGens;
  
      public static IndexGenerators withDefaults(ValueGenerators valueGenerators)
      {
          Generator<Integer>[] regularIdxGens = new Generator[valueGenerators.regularColumnGens.size()];
          Generator<Integer>[] staticIdxGens = new Generator[valueGenerators.staticColumnGens.size()];
  
          for (int i = 0; i < regularIdxGens.length; i++)
          {
              int column = i;
              regularIdxGens[i] = (rng) -> rng.nextInt(valueGenerators.regularPopulation(column));
          }
  
          for (int i = 0; i < staticIdxGens.length; i++)
          {
              int column = i;
              staticIdxGens[i] = (rng) -> rng.nextInt(valueGenerators.staticPopulation(column));
          }
  
          return new IndexGenerators(valueGenerators,
                                     // TODO: distribution for visits
                                     Generators.int32(0, valueGenerators.pkPopulation()),
                                     Generators.int32(0, valueGenerators.ckPopulation()),
                                     regularIdxGens,
                                     staticIdxGens);
      }
  
      public IndexGenerators(ValueGenerators valueGenerators,
                             Generator<Integer> pkIdxGen,
                             Generator<Integer> ckIdxGen,
                             Generator<Integer>[] regularIdxGens,
                             Generator<Integer>[] staticIdxGens)
      {
          this.valueGenerators = valueGenerators;
          this.pkIdxGen = pkIdxGen;
          this.ckIdxGen = ckIdxGen;
          this.regularIdxGens = regularIdxGens;
          this.staticIdxGens = staticIdxGens;
  
      }
  
      public IndexGenerators roundRobinPk()
      {
          Generator<Integer> pkIdxGen = new Generator<Integer>()
          {
              int offset = 0;
              @Override
              public Integer generate(EntropySource rng)
              {
                  int next = offset++;
  
                  if (offset < 0)
                      offset = 0;
  
                  return next % valueGenerators.pkPopulation();
              }
          };
  
          return new IndexGenerators(valueGenerators,
                                     pkIdxGen,
                                     ckIdxGen,
                                     regularIdxGens,
                                     staticIdxGens);
      }
  
      public IndexGenerators trackPk()
      {
          if (pkIdxGen instanceof Generators.TrackingGenerator<?>)
              return this;
  
          return new IndexGenerators(valueGenerators,
                                     Generators.tracking(pkIdxGen),
                                     ckIdxGen,
                                     regularIdxGens,
                                     staticIdxGens);
      }
  
      public IndexGenerators withChanceOfUnset(double chanceOfUnset)
      {
          Generator<Integer>[] regularIdxGens = new Generator[valueGenerators.regularColumnGens.size()];
          Generator<Integer>[] staticIdxGens = new Generator[valueGenerators.staticColumnGens.size()];
  
          for (int i = 0; i < regularIdxGens.length; i++)
          {
              int column = i;
              regularIdxGens[i] = (rng) -> rng.nextDouble() <= chanceOfUnset ? MagicConstants.UNSET_IDX : rng.nextInt(valueGenerators.regularPopulation(column));
          }
  
          for (int i = 0; i < staticIdxGens.length; i++)
          {
              int column = i;
              staticIdxGens[i] = (rng) -> rng.nextDouble() <= chanceOfUnset ? MagicConstants.UNSET_IDX : rng.nextInt(valueGenerators.staticPopulation(column));
          }
  
          return new IndexGenerators(valueGenerators,
                                     // TODO: distribution for visits
                                     Generators.int32(0, valueGenerators.pkPopulation()),
                                     Generators.int32(0, valueGenerators.ckPopulation()),
                                     regularIdxGens,
                                     staticIdxGens);
      }
  }
  