/*
	$Revision: 14 $
	$Date: 10/02/04 16:34 $
	Copyright © 1999-2004, FSL Technologies Limited. Contact "http://fost3.fsltech.com".
*/


#include "stdafx.h"


namespace {


	const FSLib::Revision c_revision( L"$Archive: /FOST.3/F3Util/nullable.cpp $", __DATE__, L"$Revision: 14 $", L"$Date: 10/02/04 16:34 $" );


	const wchar_t c_nullMsg[]=L"Attempt to de-reference null value.";
	const wchar_t c_notNullMsg[]=L"This value can only be initialised once.";


}


/*
	Functions
*/


inline
FSLib::Nullable< FSLib::wstring > FSLib::concat( const FSLib::Nullable< FSLib::wstring > &left, const FSLib::wstring &mid, const FSLib::Nullable< FSLib::wstring > &right ) {
	if ( left.isnull() && right.isnull() ) {
		return FSLib::Nullable< FSLib::wstring >();
	} if ( left.isnull() && !right.isnull() ) {
		return right;
	} if ( !left.isnull() && right.isnull() ) {
		return left;
	} else {
		return left.value() + mid + right.value();
	}
}


inline
FSLib::Nullable< FSLib::wstring > FSLib::concat( const FSLib::wstring &left, const FSLib::wstring &mid, const FSLib::Nullable< FSLib::wstring > &right ) {
	if ( right.isnull() ) {
		return left;
	} else {
		return left + mid + right.value();
	}
}


inline
FSLib::Nullable< FSLib::wstring > FSLib::concat( const FSLib::Nullable< FSLib::wstring > &left, const FSLib::wstring &mid, const FSLib::wstring &right ) {
	if ( left.isnull() ) {
		return right;
	} else {
		return left.value() + mid + right;
	}
}


inline
FSLib::Nullable< FSLib::wstring > FSLib::concat( const FSLib::wstring &left, const FSLib::wstring &mid, const FSLib::wstring &right ) {
	return left + mid + right;
}


/*
	FSLib::Exceptions::Null
*/


inline
FSLib::Exceptions::Null::Null() {
}


inline
FSLib::Exceptions::Null::Null( const FSLib::wstring &mes )
: FSLib::Exceptions::Exception( mes ) {
}


inline
const wchar_t * const FSLib::Exceptions::Null::message() const {
	return c_nullMsg;
}


/*
	FSLib::Exceptions::NotNull
*/


inline
FSLib::Exceptions::NotNull::NotNull() {
}


inline
FSLib::Exceptions::NotNull::NotNull( const FSLib::wstring &mes )
: FSLib::Exceptions::Exception( mes ) {
}


inline
FSLib::Exceptions::NotNull::NotNull( const FSLib::wstring &mes, const FSLib::wstring &inf )
: FSLib::Exceptions::Exception( mes ) {
	info() << inf << std::endl;
}


inline
const wchar_t * const FSLib::Exceptions::NotNull::message() const {
	return c_notNullMsg;
}


/*
	$History: nullable.cpp $
 * 
 * *****************  Version 14  *****************
 * User: Kirit        Date: 10/02/04   Time: 16:34
 * Updated in $/FOST.3/F3Util
 * Added new constructor for NotNull exception so that it can take an
 * informational parameter.
 * 
 * *****************  Version 13  *****************
 * User: Kirit        Date: 9/10/03    Time: 15:44
 * Updated in $/FOST.3/F3Util
 * Headers re-arranged to give a proper SDK feel and to make determination
 * of required headers simpler.
 * 
 * *****************  Version 11  *****************
 * User: Kirit        Date: 3/10/03    Time: 16:09
 * Updated in $/FOST/Cpp/FSCppUtil
 * Added stdafx.h and stdafx.cpp pre-compiled header support.
 * 
 * *****************  Version 10  *****************
 * User: Kirit        Date: 10/05/03   Time: 13:55
 * Updated in $/FOST/Cpp/FSCppUtil
 * Added a NotNull exception to handle double initialisation etc.
 * 
 * *****************  Version 9  *****************
 * User: Kirit        Date: 9/03/03    Time: 15:54
 * Updated in $/FOST/Cpp/FSCppUtil
 * FSLib::Exceptions::Null can now take an error message.
 * 
 * *****************  Version 8  *****************
 * User: Kirit        Date: 8/03/03    Time: 17:18
 * Updated in $/FOST/Cpp/FSCppUtil
 * Extended FSLib::concat to better handle string literals.
 * 
 * *****************  Version 7  *****************
 * User: Kirit        Date: 16/06/02   Time: 20:57
 * Updated in $/FOST/Cpp/FSCppUtil
 * Added concatenation function for nullable strings.
 * 
 * *****************  Version 6  *****************
 * User: Kirit        Date: 19/03/02   Time: 20:54
 * Updated in $/FOST/Cpp/FSCppUtil
 * Corrected history from last check-in.
 * Updated TestAX.IDL to remove registry entries from removed classes.
 * 
 * *****************  Version 5  *****************
 * User: Kirit        Date: 19/03/02   Time: 19:48
 * Updated in $/FOST/Cpp/FSCppUtil
 * Debug compiles now all end in '_d'.
 * The C++ implementation names (Type.cppName) have been changed to also
 * include the DLL that the implementation is in as per the documentation.
 * In all source files the following have been done:
 * * Ensured that every header file has a revision object.
 * * Ensured that every translation unit has a revision object.
 * * Ensured that every source file (which understands comments)
 * has a history section.
 * * Changed all copyright notices to be for Obsideon Ltd.
 * * Changed copyright notices to use the longest possible timeframe.
 * 
 * *****************  Version 4  *****************
 * User: Kirit        Date: 20/02/02   Time: 0:40
 * Updated in $/FOST/Cpp/FSCppUtil
 * Added revision reporting to nullable.hpp.
 * Added throw specifiers to some Nullable< T > constructors.
 * 
 * *****************  Version 3  *****************
 * User: Kirit        Date: 5/07/01    Time: 17:41
 * Updated in $/FOST/FSCppUtil
 * First Unicode only version of FOST.
 * 
 * *****************  Version 2  *****************
 * User: Kirit        Date: 26/06/01   Time: 16:32
 * Updated in $/FOST/FSCppUtil
 * Nullable<> added and working.
 * 
 * *****************  Version 1  *****************
 * User: Kirit        Date: 26/06/01   Time: 16:14
 * Created in $/FOST/FSCppUtil
*/