FactoryParams.hh

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#if !defined(h_3e645482_ae6a_43e5_8f81_abbc4200212d)
#define h_3e645482_ae6a_43e5_8f81_abbc4200212d

#include "Base/GCException.h"
#include <map>
#include <string>
#include <sstream>
#include <stdexcept>
#include "Portability.hh"

LOG4CPP_NS_BEGIN
class FactoryParams;
namespace details
{
    class base_validator_data
    {
    public:
        base_validator_data(const char* tag, const FactoryParams* params) : tag_(tag), params_(params){}

    protected:
        const char* tag_;
        const FactoryParams* params_;

        template<typename T>
        void assign(const std::string& param_value, T& value) const
        {
            assign_impl(param_value, value);
        }

        template<typename T>
        void assign_impl(const std::string& param_value, T& value) const
        {
            std::stringstream s;
            s << param_value;
            s >> value;
        }

        void assign_impl(const std::string& param_value, std::string& value) const
        {
            value = param_value;
        }

        void throw_error(const char* param_name) const
        {
            std::stringstream s;
            s << "Property '" << param_name << "' required to configure " << tag_;
            //throw std::runtime_error(s.str());
            throw RUNTIME_EXCEPTION("%s", s.str().c_str());
        }
    };

    class optional_params_validator;
    class required_params_validator : public base_validator_data
    {
    public:
        required_params_validator(const char* tag, const FactoryParams* params) : base_validator_data(tag, params) {}

        template<typename T>
        optional_params_validator optional(const char* param, T& value) const;

        template<typename T>
        const required_params_validator& operator()(const char* param, T& value) const;
    };

    class optional_params_validator : public base_validator_data
    {
    public:
        optional_params_validator(const char* tag, const FactoryParams* params) : base_validator_data(tag, params) {}

        template<typename T>
        required_params_validator required(const char* param, T& value) const { required_params_validator v(tag_, params_); v(param, value); return v; }

        template<typename T>
        const optional_params_validator& operator()(const char* param, T& value) const;
    };

    template<typename T>
    optional_params_validator required_params_validator::optional(const char* param, T& value) const { optional_params_validator v(tag_, params_); v(param, value); return v; }

    class parameter_validator : public base_validator_data
    {
    public:
        parameter_validator(const char* tag, const FactoryParams* params) : base_validator_data(tag, params) {}

        template<typename T>
        required_params_validator required(const char* param, T& value) const { required_params_validator v(tag_, params_); v(param, value); return v; }

        template<typename T>
        optional_params_validator optional(const char* param, T& value) const { optional_params_validator v(tag_, params_); v(param, value); return v; }
    };
}

class LOG4CPP_EXPORT FactoryParams
{
    typedef std::map<std::string, std::string> storage_t;

    storage_t storage_;

public:
    typedef storage_t::const_iterator const_iterator;

    const std::string& operator[](const std::string& v) const;
    std::string& operator[](const std::string& v) { return storage_[v]; }
    details::parameter_validator get_for(const char* tag) const { return details::parameter_validator(tag, this); }
    const_iterator find(const std::string& t) const;
    const_iterator begin() const { return storage_.begin(); }
    const_iterator end() const { return storage_.end(); }

private:
    /*typedef std::map<std::string, std::string> storage_t;

    storage_t storage_; */
};

namespace details
{
    template<typename T>
    const required_params_validator& required_params_validator::operator()(const char* param, T& value) const
    {
        FactoryParams::const_iterator i = params_->find(param);
        if (i != params_->end())
            assign(i->second, value);
        else
            throw_error(param);

        return *this;
    }

    template<typename T>
    const optional_params_validator& optional_params_validator::operator()(const char* param, T& value) const
    {
        FactoryParams::const_iterator i = params_->find(param);
        if (i != params_->end())
            assign(i->second, value);

        return *this;
    }
}
LOG4CPP_NS_END

#endif // h_3e645482_ae6a_43e5_8f81_abbc4200212d