Package manager for maanging the data files

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@10 0fc631ac-6414-0410-93d0-97cfa31319b6

src/util/io/package_manager.hpp

@@ -0,0 +1,60 @@
+//+----------------------------------------------------------------------------+
+//| 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