}

  enum TargetSupplier {
    STRING_WRITER {
      @Override
      Appendable get(int sz) {
        return new StringWriter(sz);
      }
    },
    STRING_BUILDER {
      @Override
      Appendable get(int sz) {
        return new StringBuilder(sz);
      }
    };

    abstract Appendable get(int sz);
  }

  @Param CopyStrategy strategy;
  @Param TargetSupplier target;

  }

  enum TargetSupplier {
    STRING_WRITER {
      @Override
      Appendable get(int sz) {
        return new StringWriter(sz);
      }
    },
    STRING_BUILDER {
      @Override
      Appendable get(int sz) {
        return new StringBuilder(sz);
      }
    };

    abstract Appendable get(int sz);
  }

  @Param CopyStrategy strategy;
  @Param TargetSupplier target;

    }

    @Override
    public int hashCode() {
      int result = 17;
      result = 37 * result + aspect1;
      result = 37 * result + aspect2;
      return result;
    }
  }

  /** Test class with invalid hashCode method. */
  private static class InvalidHashCodeObject {
    private int aspect1;
    private int aspect2;

    InvalidHashCodeObject(int aspect1, int aspect2) {

    static final int O_RDONLY = 0x01;
    static final int O_WRONLY = 0x02;
    static final int O_RDWR   = 0x03;
    static final int O_APPEND = 0x04;

    // Open Function Encoding
    // create if the file does not exist
    static final int O_CREAT  = 0x0010;
    // fail if the file exists
    static final int O_EXCL   = 0x0020;
    // truncate if the file exists

  Collection<Object> collection;

  @BeforeExperiment
  void setUp() {
    collection = source.supplier.get();
    for (int i = 0; i < size; i++) {
      collection.add(new Object());
    }
  }

  @Benchmark
  int runOperation(int reps) {
    int result = 0;
    for (int i = 0; i < reps; i++) {
      result += System.identityHashCode(operation.operate(collection.stream()));
    }
    return result;
  }

 */
public class PowerSetBenchmark {
  @Param({"2", "4", "8", "16"})
  int elements;

  Set<Set<Integer>> powerSet;

  @BeforeExperiment
  void setUp() {
    Set<Integer> set = ContiguousSet.create(Range.closed(1, elements), integers());
    powerSet = Sets.powerSet(set);
  }

  @Benchmark
  int iteration(int reps) {
    int sum = 0;
    for (int i = 0; i < reps; i++) {
      for (Set<Integer> subset : powerSet) {

        doDelete(entity, null);
    }

    public int queryDelete(CBCall<DataConfigCB> cbLambda) {
        return doQueryDelete(createCB(cbLambda), null);
    }

    public int[] batchInsert(List<DataConfig> list) {
        return batchInsert(list, null, null);
    }

    public int[] batchInsert(List<DataConfig> list, RequestOptionCall<BulkRequestBuilder> call) {

        doDelete(entity, null);
    }

    public int queryDelete(CBCall<LabelTypeCB> cbLambda) {
        return doQueryDelete(createCB(cbLambda), null);
    }

    public int[] batchInsert(List<LabelType> list) {
        return batchInsert(list, null, null);
    }

    public int[] batchInsert(List<LabelType> list, RequestOptionCall<BulkRequestBuilder> call) {

        doDelete(entity, null);
    }

    public int queryDelete(CBCall<FavoriteLogCB> cbLambda) {
        return doQueryDelete(createCB(cbLambda), null);
    }

    public int[] batchInsert(List<FavoriteLog> list) {
        return batchInsert(list, null, null);
    }

    public int[] batchInsert(List<FavoriteLog> list, RequestOptionCall<BulkRequestBuilder> call) {

        doDelete(entity, null);
    }

    public int queryDelete(CBCall<RoleCB> cbLambda) {
        return doQueryDelete(createCB(cbLambda), null);
    }

    public int[] batchInsert(List<Role> list) {
        return batchInsert(list, null, null);
    }

    public int[] batchInsert(List<Role> list, RequestOptionCall<BulkRequestBuilder> call) {