initial version ( megaglest 3.2.3-beta3 )

source/shared_lib/include/util/factory.h

@@ -0,0 +1,86 @@
+// ==============================================================
+//	This file is part of Glest Shared Library (www.glest.org)
+//
+//	Copyright (C) 2001-2008 Marti<74>o Figueroa
+//
+//	You can redistribute this code and/or modify it under 
+//	the terms of the GNU General Public License as published 
+//	by the Free Software Foundation; either version 2 of the 
+//	License, or (at your option) any later version
+// ==============================================================
+
+#ifndef _SHARED_UTIL_FACTORY_
+#define _SHARED_UTIL_FACTORY_
+
+#include <map>
+#include <string>
+#include <stdexcept>
+
+using std::map;
+using std::string;
+using std::pair;
+using std::runtime_error;
+
+namespace Shared{ namespace Util{
+
+// =====================================================
+//	class SingleFactoryBase
+// =====================================================
+
+class SingleFactoryBase{
+public:
+	virtual ~SingleFactoryBase(){}
+	virtual void *newInstance()= 0;
+};
+
+// =====================================================
+//	class SingleFactory
+// =====================================================
+
+template<typename T>
+class SingleFactory: public SingleFactoryBase{
+public:
+	virtual void *newInstance()	{return new T();}
+};
+
+// =====================================================
+//	class MultiFactory
+// =====================================================
+
+template<typename T>
+class MultiFactory{
+private:
+	typedef map<string, SingleFactoryBase*> Factories;
+	typedef pair<string, SingleFactoryBase*> FactoryPair;
+
+private:
+	Factories factories;
+
+public:
+	virtual ~MultiFactory(){
+		for(Factories::iterator it= factories.begin(); it!=factories.end(); ++it){
+			delete it->second;
+		}
+	}
+
+	template<typename R>
+	void registerClass(string classId){
+		factories.insert(FactoryPair(classId, new SingleFactory<R>()));
+	}
+
+	T *newInstance(string classId){
+		Factories::iterator it= factories.find(classId);
+		if(it == factories.end()){
+			throw runtime_error("Unknown class identifier: " + classId);
+		}
+		return static_cast<T*>(it->second->newInstance());
+	}
+
+	bool isClassId(string classId){
+		return factories.find(classId)!=factories.end();
+	}
+};
+
+}}//end namespace
+
+#endif