MagicSetEditor2/src/util/io/package_manager.hpp

//+----------------------------------------------------------------------------+
//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
//| Copyright:    (C) 2001 - 2006 Twan van Laarhoven                           |
//| License:      GNU General Public License 2 or later (see file COPYING)     |
//+----------------------------------------------------------------------------+

#ifndef HEADER_UTIL_IO_PACKAGE_MANAGER
#define HEADER_UTIL_IO_PACKAGE_MANAGER

// ----------------------------------------------------------------------------- : Includes

#include <util/prec.hpp>
#include <util/io/package.hpp>
#include <wx/filename.h>

DECLARE_POINTER_TYPE(Packaged);

// ----------------------------------------------------------------------------- : PackageManager

/// Package manager, loads data files from the default data directory
/** The PackageManager ensures that each package is only loaded once.
 *  There is a single global instance of the PackageManager, called packages
 */
class PackageManager {
  public:
	PackageManager();
	
	/// Open a package with the specified name (including extension)
	template <typename T>
	shared_ptr<T> open(const String& name) {
		wxFileName fn(dataDirectory + _("/") + name);
		fn.Normalize();
		String filename = fn.GetFullPath();
		// Is this package already loaded?
		PackagedP& p = loadedPackages[filename];
		shared_ptr<T> typedP = dynamic_pointer_cast<T>(p);
		if (typedP) {
			return typedP;
		} else {
			// not loaded, or loaded with wrong type
			p = typedP = new_shared<T>();
			typedP->open(filename);
			return typedP;
		}
	}
	
	/// Open a package with the specified name
	/// the type of package is determined by its extension!
	PackagedP openAnyPackage(const String& filename);
	
  private:
	map<String, PackagedP> loadedPackages;
	String dataDirectory;
};

/// The global PackageManager instance
extern PackageManager packages;

// ----------------------------------------------------------------------------- : EOF
#endif