/************************************************************************
	filename: 	CEGUISchemeManager.h
	created:	21/2/2004
	author:		Paul D Turner
	
	purpose:	Defines the interface to the SchemeManager class
*************************************************************************/
/*************************************************************************
    Crazy Eddie's GUI System (http://www.cegui.org.uk)
    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/
#ifndef _CEGUISchemeManager_h_
#define _CEGUISchemeManager_h_

#include "CEGUIBase.h"
#include "CEGUIString.h"
#include "CEGUISingleton.h"
#include "CEGUIIteratorBase.h"
#include <map>


#if defined(_MSC_VER)
#	pragma warning(push)
#	pragma warning(disable : 4275)
#	pragma warning(disable : 4251)
#endif


// Start of CEGUI namespace section
namespace CEGUI
{
/*!
\brief
	A class that manages the creation of, access to, and destruction of GUI Scheme objects
*/
class CEGUIEXPORT SchemeManager : public Singleton<SchemeManager>
{
public:
	/*!
	\brief
		Constructor for SchemeManager objects
	*/
	SchemeManager(void);


	/*!
	\brief
		Destructor for SchemeManager objects
	*/
	~SchemeManager(void);


	/*!
	\brief
		Return singleton SchemeManager object

	\return
		Singleton SchemeManager object
	*/
	static	SchemeManager&	getSingleton(void);


	/*!
	\brief
		Return pointer to singleton SchemeManager object

	\return
		Pointer to singleton SchemeManager object
	*/
	static	SchemeManager*	getSingletonPtr(void);


	/*!
	\brief
		Loads a scheme

	\param scheme_filename
		String object that holds the filename of the scheme to be loaded

    \param resourceGroup
        Resource group identifier to be passed to the resource manager.  NB: This
        affects loading of the scheme xml file only, scheme resources may specify
        their own groups.

	\return
		Pointer to an object representing the loaded Scheme.
	*/
	Scheme*	loadScheme(const String& scheme_filename, const String& resourceGroup = "");


	/*!
	\brief
		Unloads all data referenced in a scheme.  If any object is using some resource which is listed in the scheme, this function
		will effectively pull the rug out from under those objects.  This should be used with extreme caution, or not at all.

	\param scheme_name
		String object specifying the name of the Scheme to be unloaded.
	*/
	void	unloadScheme(const String& scheme_name);


	/*!
	\brief
		Returns true if the named Scheme is present in the system (though the resources for the scheme may or may not be loaded)

	\param scheme_name
		String object specifying the name of the Scheme to check for.

	\return
		true if the scheme is loaded, false if it is not.
	*/
	bool	isSchemePresent(const String& scheme_name) const		{return (d_schemes.find(scheme_name) != d_schemes.end());}


	/*!
	\brief
		Returns a pointer to the Scheme object with the specified name.

	\param name
		String object holding the name of the Scheme to be returned.

	\return
		Pointer to the Scheme named \a name.

	\exception UnknownObjectException	thrown if no Scheme named \a name is present in the system
	*/
	Scheme*	getScheme(const String& name) const;


	/*!
	\brief
		Unload all schemes currently defined within the system.

	\note
		Calling this method has the potential to be very dangerous; if any of the
		data that forms part of the scheme is still in use, you can expect
		fireworks shortly after!

	\return
		Nothing.
	*/
	void	unloadAllSchemes(void);

private:
	/*************************************************************************
		Implementation Data
	*************************************************************************/
	typedef	std::map<String, Scheme*> SchemeRegistry;
	SchemeRegistry	d_schemes;			//!< Collection that tracks the loaded Schemes.


public:
	/*************************************************************************
		Iterator stuff
	*************************************************************************/
	typedef	ConstBaseIterator<SchemeRegistry>	SchemeIterator;

	/*!
	\brief
		Return a SchemeManager::SchemeIterator object to iterate over the available schemes.
	*/
	SchemeIterator	getIterator(void) const;
};

} // End of  CEGUI namespace section

#if defined(_MSC_VER)
#	pragma warning(pop)
#endif

#endif	// end of guard _CEGUISchemeManager_h_