integers.hpp

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/*****************************************************************************
** Ifdefs
*****************************************************************************/

#ifndef ECL_CONVERTERS_CONVERTERS_INTEGERS_HPP_
#define ECL_CONVERTERS_CONVERTERS_INTEGERS_HPP_

/*****************************************************************************
** Includes
*****************************************************************************/

#include <string>
#include <sstream>
#include <ecl/exceptions/standard_exception.hpp>
#include "converter.hpp"

/*****************************************************************************
** Namespaces
*****************************************************************************/

namespace ecl {

/*****************************************************************************
** Interfaces
*****************************************************************************/

template <>
class Converter<int,std::string> : public converters::ConverterBase {
public:
        virtual ~Converter() {};
        int operator()(const std::string &input) {
                int i;
                std::istringstream stream(input);
                char c;
                if ( !( stream >> i ) || (stream.get(c))) { // Second part checks that there isn't leftover characters
                        ecl_debug_throw(StandardException(LOC,ConversionError));
                        error_handler = ConversionError;
                }
                return i;
        }
};
template <>
class Converter<int,char> : public converters::ConverterBase {
public:
        int operator()(char c) {
                if ( ( c < '0' ) || (c > '9') ) {
                        ecl_debug_throw(StandardException(LOC,ConversionError));
                        error_handler = ConversionError;
                }
                return static_cast<int>(c - '0');
        }
};

template <>
class Converter<int,unsigned char*> {
private:
        Converter() {
                // This class is being depracated! Use the byte array converters instead (converters/from_byte_array.hpp)
        }
public:
//      /**
//       * Converts a byte array to an integer type. The bytes are ordered from
//       * least significant to most significant (little-endian). Warning: the
//       * byte array must be the same size as the integer that it is being
//       * converted to (i.e. usually 4 bytes).
//       *
//       * @param byte_array : the input string to be converted.
//       * @return int : the integer representation of the digit.
//       **/
//      int operator()(const unsigned char* byte_array) {
//              int value = 0;
//              for (unsigned int i = 0; i < sizeof(int); ++i ) {
//                      value |= *(byte_array+i) << 8*i;
//              }
//              return value;
//      }
};
template <>
class Converter<int,char*> : public converters::ConverterBase {
private:
        Converter() {
                // This class is being depracated! Use the byte array converters instead (converters/from_byte_array.hpp)
        }
public:
// NEW
//        /**
//         * Converts a c string to an integer type. This converts
//         * ascii characters to an integer, not bytes to integer. For that
//         * see the byte array converters in this package.
//         *
//         * @todo Add checks to ensure the range of int is not exceeded.
//         *
//         * @param c_str : the input string to be converted.
//         * @return int : the integer representation of the digit.
//         *
//         * @exception : throws in debug mode if a non-digit char is found (debug mode only).
//         **/
//        int operator()(const char* c_str) {
//              int value = 0;
//              bool negative_flag = false;
//              unsigned int starting_index = 0;
//              if ( c_str[0] == '-' ) {
//                      negative_flag = true;
//                      starting_index = 1;
//              }
//              size_t length = ::strlen(c_str);
//              int multiplier = 1;
//              for ( unsigned int i = length-1; i >= starting_index; --i ) {
//                if ( ( c_str[i] < '0' ) || (c_str[i] > '9') ) {
//                    ecl_debug_throw(StandardException(LOC,ConversionError));
//                    error_handler = ConversionError;
//                }
//                value += multiplier*static_cast<int>(c_str[i] - '0');
//                multiplier *= 10;
//              }
//              if ( negative_flag) {
//                      value *= -1;
//              }
//            return value;
//        }
// OLD
//      /**
//       * Converts a char array to an integer type. The bytes are ordered from
//       * least significant to most significant (little-endian). Warning: the
//       * byte array must be the same size as the integer that it is being
//       * converted to (i.e. usually 4 bytes).
//       *
//       * @param byte_array : the input string to be converted.
//       * @return int : the integer representation of the digit.
//       **/
//      int operator()(const char* byte_array) {
//              if ( ::strlen(byte_array) != sizeof(int) ) {
//                      ecl_debug_throw(StandardException(LOC,InvalidInputError,"Input char string length is too large/small for conversion to int."));
//              }
//              int value = 0;
//              for (unsigned int i = 0; i < sizeof(int); ++i ) {
//                      value |= static_cast<unsigned char>(*(byte_array+i)) << 8*i;
//              }
//      return value;
//      }
};

template <>
class Converter<int,void>  :
        public Converter<int,std::string>,
        public Converter<int,char>
//        public Converter<int,unsigned char*>,
//        public Converter<int,char*>
{
    public:
        using Converter<int,std::string>::operator();
        using Converter<int,char>::operator();
//        using Converter<int,unsigned char*>::operator();
//        using Converter<int,char*>::operator();
};


} // namespace ecl

#endif /* ECL_CONVERTERS_INTEGERS_HPP_ */