IDocumentStateComparator.h

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/********************************************************************************
**  This file is part of the ICF Framework. Copyright (C) Witold Gantzke & Kirill Lepskiy
**  ICF Framework may be used under the terms of the LGPL License v. 2.1 by the Free Software Foundation.
********************************************************************************/
 
#pragma once
 
 
// ICF includes
#include <istd/IChangeable.h>
 
 
namespace idoc
{
 
 
class IDocumentStateComparator: virtual public istd::IChangeable
{
public:
    enum DocumentChangeFlag
    {
        DCF_UNKNOWN,
        DCF_EQUAL,
        DCF_DIFFERENT
    };
 
    virtual bool HasStoredDocumentState() const = 0;
    virtual bool StoreDocumentState() = 0;
    virtual bool RestoreDocumentState() = 0;
    virtual DocumentChangeFlag GetDocumentChangeFlag() const = 0;
};
 
 
} // namespace idoc