[Mod-c-cvs] ehtml/include Plugin.h,NONE,1.1

[Gonzalo A. <ga...@us...>]

Update of /cvsroot/mod-c/ehtml/include
In directory sc8-pr-cvs7.sourceforge.net:/tmp/cvs-serv14484/include

Added Files:
	Plugin.h 
Log Message:
Plugin<C>: a plug-in class framework (see SessionDriver for an example).


--- NEW FILE: Plugin.h ---

#ifndef __PLUGIN_H_
#define __PLUGIN_H_

#include <assert.h>
#include <string>
#include <map>

template <class C>
class Pluggable {
	typedef std::map<std::string,C*> _map_t;
	static _map_t _map;
	std::string _name;

	static C* _selected;
public:
	Pluggable() { ; }
	Pluggable(const char* name): _name(name) { ; }
	virtual ~Pluggable() { ; }

	const std::string& name() const { return _name; }
	std::string& name() { return _name; }
	void name(const std::string& __name) { _name = __name; }

	static C* Selected() { return _selected; }
	static C* Select(std::string name) { return _selected = getByName(name); }
	static C* Select(C* c) { return _selected = getByName(c->name()); }

	static C* getByName(std::string name) {
		typename _map_t::iterator i = _map.find(name);
		if (i == _map.end()) {
			errno = ENOENT;
			return NULL;
		}
		return i->second;
	}

	static bool Register(C* c) {
		_map[c->name()] = c;
		// this does not work ....
		//std::pair<typename _map_t::iterator,bool> dev =
		//	_map.insert(_map_t::value_type(c->name(),c));
		return true;
	}

	typedef C* (*Factory)();
};

#define DECLARE_PLUGIN(C) \
	map<string,C*> Pluggable<C>::_map; \
	C* Pluggable<C>::_selected = NULL;

//@TODO: write a plug-in registerer

#endif