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#ifndef VARIABLES_H
#define VARIABLES_H
#include <boost/intrusive_ptr.hpp>
#include <boost/optional.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <stdint.h>
#include <glibmm/ustring.h>
#include <libxml++/nodes/element.h>
#include <libxml++/attribute.h>
#include "intrusivePtrBase.h"
#include "xmlObjectLoader.h"
#include <boost/variant.hpp>
#include <boost/shared_ptr.hpp>
class Null {
public:
bool operator<(const Null &) const;
};
typedef boost::variant<
Null,
// Strings
Glib::ustring,
// Numbers
long long unsigned int,
long unsigned int,
unsigned int,
short unsigned int,
long long int,
long int,
int,
short int,
double,
float,
// DateTimes
boost::posix_time::ptime
> _VT;
class VariableType : public _VT {
public:
typedef void(*Freer)(const void*);
template<typename T>
VariableType(const T & t) : _VT(t), convertCache(NULL), freer(NULL) { }
VariableType();
VariableType(const VariableType &);
~VariableType();
void operator=(const VariableType &);
bool operator<(const VariableType &) const;
operator const Glib::ustring &() const;
operator const std::string &() const;
operator const char *() const;
operator const unsigned char *() const;
operator int64_t() const;
operator int32_t() const;
operator double() const;
operator const boost::posix_time::ptime &() const;
template <typename T> const T * get() const { return boost::get<T>(this); }
private:
template <typename T> friend const T * set(const VariableType * var, const T * t, Freer);
mutable const void * convertCache;
mutable Freer freer;
};
/// Base class for Project2 variable accessors
class VariableImpl : public IntrusivePtrBase {
public:
virtual VariableType value() const = 0;
protected:
virtual ~VariableImpl() = 0;
};
class Variable {
public:
typedef boost::intrusive_ptr<VariableImpl> VariableImplPtr;
Variable(const xmlpp::Element *, const Glib::ustring & n, bool required = true, VariableType def = VariableType());
Variable(const xmlpp::Element *, const boost::optional<Glib::ustring> &);
Variable(VariableType def);
static Variable makeParent(const Glib::ustring & name, bool attr, unsigned int depth);
operator VariableType () const { return var->value(); }
VariableType operator()() const { return var->value(); }
private:
Variable(VariableImpl *);
friend class VariableParse;
VariableImplPtr var;
};
/// Base class for variables whose content is dynamic
class VariableImplDyn : public VariableImpl {
public:
VariableImplDyn(const xmlpp::Element * e);
virtual VariableType value() const = 0;
protected:
boost::optional<Variable> defaultValue;
};
/// Base class to create variables
class VariableLoader : public ComponentLoader {
public:
virtual VariableImpl * create(const xmlpp::Element *) const = 0;
};
/// Helper implementation of VariableLoader for specific variable types
template <class VarType>
class VariableLoaderImpl : public VariableLoader {
public:
virtual VariableImpl * create(const xmlpp::Element * e) const
{
return new VarType(e);
}
};
#endif
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