//
// ConfigurationMapper.h
//
// $Id: //poco/Main/Util/include/Util/ConfigurationMapper.h#1 $
//
// Definition of the ConfigurationMapper class.
//
// Copyright (c) 2004-2005, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
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//
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//


#ifndef Util_ConfigurationMapper_INCLUDED
#define Util_ConfigurationMapper_INCLUDED


#ifndef Util_Util_INCLUDED
#include "Util/Util.h"
#endif
#ifndef Util_AbstractConfiguration_INCLUDED
#include "Util/AbstractConfiguration.h"
#endif


Util_BEGIN


class Util_API ConfigurationMapper: public AbstractConfiguration
	/// This configuration maps a property hierarchy into another
	/// hierarchy.
	/// 
	/// For example, given a configuration with the following properties:
	///     config.value1
	///     config.value2
	///     config.sub.value1
	///     config.sub.value2
	/// and a ConfigurationView with fromPrefix == "config" and toPrefix == "root.conf", then
	/// the above properties will be available via the mapper as
	///     root.conf.value1
	///     root.conf.value2
	///     root.conf.sub.value1
	///     root.conf.sub.value2
	///
	/// FromPrefix can be empty, in which case, and given toPrefix == "root",
	/// the properties will be available as
	///     root.config.value1
	///     root.config.value2
	///     root.config.sub.value1
	///     root.config.sub.value2
	///
	/// This is equivalent to the functionality of the ConfigurationView class.
	///
	/// Similarly, toPrefix can also be empty. Given fromPrefix == "config" and
	/// toPrefix == "", the properties will be available as
	///     value1
	///     value2
	///     sub.value1
	///     sub.value2
	///
	/// If both fromPrefix and toPrefix are empty, no mapping is performed.
	///
	/// A ConfigurationMapper is most useful in combination with a
	/// LayeredConfiguration.
{
public:
	ConfigurationMapper(const std::string& fromPrefix, const std::string& toPrefix, AbstractConfiguration* pConfig);
		/// Creates the ConfigurationMapper. The ConfigurationMapper does not take
		/// ownership of the passed configuration.

protected:
	bool getRaw(const std::string& key, std::string& value) const;
	void setRaw(const std::string& key, const std::string& value);
	void enumerate(const std::string& key, Keys& range) const;
	
	std::string translateKey(const std::string& key) const;
	
	~ConfigurationMapper();

private:
	ConfigurationMapper(const ConfigurationMapper&);
	ConfigurationMapper& operator = (const ConfigurationMapper&);

	std::string _fromPrefix;
	std::string _toPrefix;
	AbstractConfiguration* _pConfig;
};


Util_END


#endif // Util_ConfigurationMapper_INCLUDED