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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#ifndef AGGREGATE_H
#define AGGREGATE_H
#include "aggregation_global.h"
#include <QObject>
#include <QList>
#include <QHash>
#include <QReadWriteLock>
#include <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 // AGGREGATE_H
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