granicus.if.org Git - icinga2/blob - lib/livestatus/minaggregator.cpp

   1 /* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
   2
   3 #include "livestatus/minaggregator.hpp"
   4
   5 using namespace icinga;
   6
   7 MinAggregator::MinAggregator(String attr)
   8         : m_MinAttr(std::move(attr))
   9 { }
  10
  11 MinAggregatorState *MinAggregator::EnsureState(AggregatorState **state)
  12 {
  13         if (!*state)
  14                 *state = new MinAggregatorState();
  15
  16         return static_cast<MinAggregatorState *>(*state);
  17 }
  18
  19 void MinAggregator::Apply(const Table::Ptr& table, const Value& row, AggregatorState **state)
  20 {
  21         Column column = table->GetColumn(m_MinAttr);
  22
  23         Value value = column.ExtractValue(row);
  24
  25         MinAggregatorState *pstate = EnsureState(state);
  26
  27         if (value < pstate->Min)
  28                 pstate->Min = value;
  29 }
  30
  31 double MinAggregator::GetResultAndFreeState(AggregatorState *state) const
  32 {
  33         MinAggregatorState *pstate = EnsureState(&state);
  34
  35         double result;
  36
  37         if (pstate->Min == DBL_MAX)
  38                 result = 0;
  39         else
  40                 result = pstate->Min;
  41
  42         delete pstate;
  43
  44         return result;
  45 }