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c22391b2 Christian Ehringfeld
/*
* Copyright (C) 2015 Christian Ehringfeld <c.ehringfeld@t-online.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* This program 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 Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
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#ifndef ENTITYINSTANCEFACTORY_H
#define ENTITYINSTANCEFACTORY_H
#include <QString>
#include <QVariant>
#include <QHash>
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#include "attribute.h"
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namespace CuteEntityManager {
class Entity;
class EntityInstanceFactory {
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public:
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static Entity *createInstance(const char *className);
static Entity *createInstance(const QString &className);
static Entity *createInstance(int metaTypeId);
static Entity *createInstance(const char *className,
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const QHash<QString, QVariant> &attributes);
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static void setAttributes(Entity *&e,
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const QHash<QString, QVariant> &attributes,
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QHash<QString, QMetaProperty> metaprops);
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static void setAttributes(Entity *&e,
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const QHash<QString, QVariant> &attributes);
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static const QString extractEntityType(const QString &s);
static Entity *newSuperClassInstance(const Entity *e);
static Entity *createInstance(const QMetaObject *object);
static QList<QSharedPointer<Entity>> castQVariantList(QVariant &list);
static QSharedPointer<Entity> castQVariant(QVariant &entity);
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static QStringList getRegisteredClasses();
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template<typename T>
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static Entity *createInstance() {
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return EntityInstanceFactory::createInstance(qMetaTypeId<T>());
}
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static Entity *createInstance(Attribute *&attr);

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//http://www.mimec.org/node/350
template<typename T>
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static void registerClass() {
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if (!EntityInstanceFactory::instance.contains(
T::staticMetaObject.className())) {
EntityInstanceFactory::instance.insert( T::staticMetaObject.className(),
&constructorHelper<T> );
QString lName = "QList<QSharedPointer<";
lName.append(T::staticMetaObject.className());
lName.append(">>");
qRegisterMetaType<QList<QSharedPointer<T>>>(lName.toLatin1().constData());
}
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}

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static Entity *createObject( const QByteArray &className) {
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Constructor constructor = EntityInstanceFactory::instance.value( className );
if ( constructor == nullptr ) {
return nullptr;
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}
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return (*constructor)();
}

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private:
typedef Entity *(*Constructor)();
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template<typename T>
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static Entity *constructorHelper() {
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return new T();
}
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static QHash<QByteArray, Constructor> instance;
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protected:
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EntityInstanceFactory();
};
}
#endif // ENTITYINSTANCEFACTORY_H