string hll_sketch_alloc::to_string()

in hll/include/HllSketch-internal.hpp [245:344]

• 96 lines of code
• 15 McCabe index (conditional complexity)

string<A> hll_sketch_alloc<A>::to_string(const bool summary,
                                         const bool detail,
                                         const bool aux_detail,
                                         const bool all) const {
  // Using a temporary stream for implementation here does not comply with AllocatorAwareContainer requirements.
  // The stream does not support passing an allocator instance, and alternatives are complicated.
  std::stringstream os;
  if (summary) {
    os << "### HLL sketch summary:" << std::endl
       << "  Log Config K   : " << std::to_string(get_lg_config_k()) << std::endl
       << "  Hll Target     : " << type_as_string() << std::endl
       << "  Current Mode   : " << mode_as_string() << std::endl
       << "  LB             : " << get_lower_bound(1) << std::endl
       << "  Estimate       : " << get_estimate() << std::endl
       << "  UB             : " << get_upper_bound(1) << std::endl
       << "  OutOfOrder flag: " << (is_out_of_order_flag() ? "true" : "false") << std::endl;
    if (get_current_mode() == HLL) {
      HllArray<A>* hllArray = (HllArray<A>*) sketch_impl;
      os << "  CurMin         : " << std::to_string(hllArray->getCurMin()) << std::endl
         << "  NumAtCurMin    : " << hllArray->getNumAtCurMin() << std::endl
         << "  HipAccum       : " << hllArray->getHipAccum() << std::endl
         << "  KxQ0           : " << hllArray->getKxQ0() << std::endl
         << "  KxQ1           : " << hllArray->getKxQ1() << std::endl;
      if (get_target_type() == HLL_4) {
        const Hll4Array<A>* hll4_ptr = static_cast<const Hll4Array<A>*>(sketch_impl);
        os << "  Aux table?     : " << (hll4_ptr->getAuxHashMap() != nullptr ? "true" : "false") << std::endl;
      }
    } else {
      os << "  Coupon count   : "
         << std::to_string(((CouponList<A>*) sketch_impl)->getCouponCount()) << std::endl;
    }
    os << "### End HLL sketch summary" << std::endl;
  }

  if (detail) {
    os << "### HLL sketch data detail:" << std::endl;
    if (get_current_mode() == HLL) {
      const HllArray<A>* hll_ptr = static_cast<const HllArray<A>*>(sketch_impl);
      os << std::left << std::setw(10) << "Slot" << std::setw(6) << "Value" << std::endl;
      auto it = hll_ptr->begin(all);
      while (it != hll_ptr->end()) {
        os << std::setw(10) << HllUtil<A>::getLow26(*it);
        os << std::setw(6) << HllUtil<A>::getValue(*it);
        os << std::endl;
        ++it;
      }
    } else {
      const CouponList<A>* list_ptr = static_cast<const CouponList<A>*>(sketch_impl);
      os << std::left;
      os << std::setw(10) << "Index";
      os << std::setw(10) << "Key";
      os << std::setw(10) << "Slot";
      os << std::setw(6) << "Value";
      os << std::endl;
      auto it = list_ptr->begin(all);
      int i = 0;
      int mask = (1 << get_lg_config_k()) - 1;
      while (it != list_ptr->end()) {
        os << std::setw(10) << i;
        os << std::setw(10) << HllUtil<A>::getLow26(*it);
        os << std::setw(10) << (HllUtil<A>::getLow26(*it) & mask);
        os << std::setw(6) << HllUtil<A>::getValue(*it);
        os << std::endl;
        ++it;
        ++i;
      }
    }
    os << "### End HLL sketch data detail" << std::endl;
  }
  if (aux_detail) {
    if ((get_current_mode() == HLL) && (get_target_type() == HLL_4)) {
      const Hll4Array<A>* hll4_ptr = static_cast<const Hll4Array<A>*>(sketch_impl);
      const AuxHashMap<A>* aux_ptr = hll4_ptr->getAuxHashMap();
      if (aux_ptr != nullptr) {
        os << "### HLL sketch aux detail:" << std::endl;
        os << std::left;
        os << std::setw(10) << "Index";
        os << std::setw(10) << "Key";
        os << std::setw(10) << "Slot";
        os << std::setw(6) << "Value";
        os << std::endl;
        auto it = aux_ptr->begin(all);
        int i = 0;
        int mask = (1 << get_lg_config_k()) - 1;
        while (it != aux_ptr->end()) {
          os << std::setw(10) << i;
          os << std::setw(10) << HllUtil<A>::getLow26(*it);
          os << std::setw(10) << (HllUtil<A>::getLow26(*it) & mask);
          os << std::setw(6) << HllUtil<A>::getValue(*it);
          os << std::endl;
          ++it;
          ++i;
        }
        os << "### End HLL sketch aux detail" << std::endl;
      }
    }
  }

  return string<A>(os.str().c_str(), sketch_impl->getAllocator());
}