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/*
* Copyright (C) 2011 Nicolas Bonnefon and other contributors
*
* This file is part of glogg.
*
* glogg 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.
*
* glogg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with glogg. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PERSISTENTINFO_H
#define PERSISTENTINFO_H
#include <QSettings>
class Persistable;
// Singleton class managing the saving of persistent data to permanent storage
// Clients must implement Persistable and register with this object, they can
// then be saved/loaded.
class PersistentInfo {
public:
// Initialise the storage backend for the Persistable, migrating the settings
// if needed. Must be called before any other function.
void migrateAndInit();
// Register a Persistable
void registerPersistable( Persistable* object, const QString& name );
// Get a Persistable (or NULL if it doesn't exist)
Persistable* getPersistable( const QString& name );
// Save a persistable to its permanent storage
void save( const QString& name );
// Retrieve a persistable from permanent storage
void retrieve( const QString& name );
private:
// Can't be constructed or copied (singleton)
PersistentInfo();
PersistentInfo( const PersistentInfo& );
~PersistentInfo();
// Has migrateAndInit() been called?
bool initialised_;
// List of persistables
QHash<QString, Persistable*> objectList_;
// Qt setting object
QSettings* settings_;
// allow this function to create one instance
friend PersistentInfo& GetPersistentInfo();
};
PersistentInfo& GetPersistentInfo();
// Global function used to get an object from the PersistentInfo store
template<typename T>
T& Persistent( const char* name )
{
Persistable* p = GetPersistentInfo().getPersistable( QString( name ) );
return dynamic_cast<T&>(*p);
}
#endif
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