ChangePropertyDelta.h

Go to the documentation of this file.

/* Copyright © 2009 James Legg.
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
*/

#ifndef CHANGE_PROPERTY_DELTA_H_
#define CHANGE_PROPERTY_DELTA_H_

#include "DocumentDelta.h"

namespace Document
{

template<class Data>
class PropertyDeltaIdentifier
{
public:
    virtual ~PropertyDeltaIdentifier()
    {
    }
    virtual void read(const Track::Track & track, Data & data) = 0;
    virtual void write(Track::Track & track, const Data & data) = 0;
};

template <class Identifier, class Data>
class ChangePropertyDelta
    :   public DocumentDelta
{
public:
    ChangePropertyDelta(Identifier identifier, Data data)
        :   identifier(identifier)
        ,   new_data(data)
    {
    }
    virtual void apply(Track::Track & track)
    {
        identifier.read(track, old_data);
        identifier.write(track, new_data);
    }
    virtual void unapply(Track::Track & track)
    {
        identifier.write(track, old_data);
    }
protected:
    Identifier identifier;
    Data new_data;
    Data old_data;
};

}

#endif

---

Generated at Mon Sep 6 00:41:11 2010 by Doxygen version 1.4.7 for Racer version svn335.