/*

* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  

*

*/

#ifndef __TCHANGE_H__

#define __TCHANGE_H__

#include <string>

#include <list>

#include <utility>

using namespace std;

/**

* This template is used for making it a little easier to keep information about 

* which files the value is associated, namely base and current files. 

* At the moment used only in MacroAnalyser.

*/

template <class KTvalue> class TChange

{

public:

    TChange(string aBase, KTvalue aValue);

    TChange(string aBase, string aCurrent, KTvalue aValue);

    ~TChange(void);

    string GetBase();

    string GetCurrent();

    KTvalue& GetValue();

    void SetBase(string aBase);

    void SetCurrent(string aCurrent);

    void SetValue(KTvalue aValue);

private:

    pair<list<string>, KTvalue> iValue;

};

template <class KTvalue> TChange<KTvalue>::TChange(string aBase, KTvalue aValue)

{

    iValue.first.push_back(aBase);

    iValue.second = aValue;

}

template <class KTvalue> TChange<KTvalue>::TChange(string aBase, string aCurrent, KTvalue aValue)

{

    iValue.first.push_back(aBase);

    iValue.first.push_back(aCurrent);

    iValue.second = aValue;

}

template <class KTvalue> TChange<KTvalue>::~TChange(void)

{

}

template <class KTvalue> string TChange<KTvalue>::GetBase()

{

    return iValue.first.front();

}

template <class KTvalue> string TChange<KTvalue>::GetCurrent()

{

    string ret;

    if (iValue.first.size() == 2)

    {

        ret = iValue.first.back();

    } else

    {

        ret = "";

    }

    return ret;

}

template <class KTvalue> KTvalue& TChange<KTvalue>::GetValue()

{

    return iValue.second;

}

template <class KTvalue> void TChange<KTvalue>::SetBase(string aBase)

{

    iValue.first.pop_front();

    iValue.first.push_front(aBase);

}

template <class KTvalue> void TChange<KTvalue>::SetCurrent(string aCurrent)

{

    if (iValue.first.size() == 2)

    {

        iValue.first.pop_back();

        iValue.first.push_back(aCurrent);

    } else

    {

        iValue.first.push_back(aCurrent);

    }

}

template <class KTvalue> void TChange<KTvalue>::SetValue(KTvalue aValue)

{

    iValue.second = aValue;

}

#endif