granicus.if.org Git - icinga2/blob - lib/base/convert.hpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/)  *
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  19
  20 #ifndef CONVERT_H
  21 #define CONVERT_H
  22
  23 #include "base/i2-base.hpp"
  24 #include "base/value.hpp"
  25 #include <boost/lexical_cast.hpp>
  26
  27 namespace icinga
  28 {
  29
  30 /**
  31  * Utility class for converting types.
  32  *
  33  * @ingroup base
  34  */
  35 class Convert
  36 {
  37 public:
  38         template<typename T>
  39         static long ToLong(const T& val)
  40         {
  41                 try {
  42                         return boost::lexical_cast<long>(val);
  43                 } catch (const std::exception&) {
  44                         std::ostringstream msgbuf;
  45                         msgbuf << "Can't convert '" << val << "' to an integer.";
  46                         BOOST_THROW_EXCEPTION(std::invalid_argument(msgbuf.str()));
  47                 }
  48         }
  49
  50         template<typename T>
  51         static double ToDouble(const T& val)
  52         {
  53                 try {
  54                         return boost::lexical_cast<double>(val);
  55                 } catch (const std::exception&) {
  56                         std::ostringstream msgbuf;
  57                         msgbuf << "Can't convert '" << val << "' to a floating point number.";
  58                         BOOST_THROW_EXCEPTION(std::invalid_argument(msgbuf.str()));
  59                 }
  60         }
  61
  62         static long ToLong(const Value& val)
  63         {
  64                 return val;
  65         }
  66
  67         static double ToDouble(const Value& val)
  68         {
  69                 return val;
  70         }
  71
  72         static bool ToBool(const Value& val)
  73         {
  74                 return val.ToBool();
  75         }
  76
  77         template<typename T>
  78         static String ToString(const T& val)
  79         {
  80                 return boost::lexical_cast<std::string>(val);
  81         }
  82
  83         static String ToString(const String& val);
  84         static String ToString(const Value& val);
  85         static String ToString(double val);
  86
  87         static double ToDateTimeValue(double val);
  88         static double ToDateTimeValue(const Value& val);
  89
  90 private:
  91         Convert();
  92 };
  93
  94 }
  95
  96 #endif /* CONVERT_H */