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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (info@qt.nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#ifndef QAGGREGATION_H
#define QAGGREGATION_H
#include "aggregation_global.h"
#include <QtCore/QObject>
#include <QtCore/QList>
#include <QtCore/QHash>
#include <QtCore/QReadWriteLock>
#include <QtCore/QReadLocker>
namespace Aggregation {
class AGGREGATION_EXPORT Aggregate : public QObject
{
Q_OBJECT
public:
Aggregate(QObject *parent = 0);
virtual ~Aggregate();
void add(QObject *component);
void remove(QObject *component);
template <typename T> T *component() {
QReadLocker(&lock());
foreach (QObject *component, m_components) {
if (T *result = qobject_cast<T *>(component))
return result;
}
return (T *)0;
}
template <typename T> QList<T *> components() {
QReadLocker(&lock());
QList<T *> results;
foreach (QObject *component, m_components) {
if (T *result = qobject_cast<T *>(component)) {
results << result;
}
}
return results;
}
static Aggregate *parentAggregate(QObject *obj);
static QReadWriteLock &lock();
signals:
void changed();
private slots:
void deleteSelf(QObject *obj);
private:
static QHash<QObject *, Aggregate *> &aggregateMap();
QList<QObject *> m_components;
};
// get a component via global template function
template <typename T> T *query(Aggregate *obj)
{
if (!obj)
return (T *)0;
return obj->template component<T>();
}
template <typename T> T *query(QObject *obj)
{
if (!obj)
return (T *)0;
T *result = qobject_cast<T *>(obj);
if (!result) {
QReadLocker(&lock());
Aggregate *parentAggregation = Aggregate::parentAggregate(obj);
result = (parentAggregation ? query<T>(parentAggregation) : 0);
}
return result;
}
// get all components of a specific type via template function
template <typename T> QList<T *> query_all(Aggregate *obj)
{
if (!obj)
return QList<T *>();
return obj->template components<T>();
}
template <typename T> QList<T *> query_all(QObject *obj)
{
if (!obj)
return QList<T *>();
QReadLocker(&lock());
Aggregate *parentAggregation = Aggregate::parentAggregate(obj);
QList<T *> results;
if (parentAggregation)
results = query_all<T>(parentAggregation);
else if (T *result = qobject_cast<T *>(obj))
results.append(result);
return results;
}
} // namespace Aggregation
#endif // QAGGREGATION_H
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