aggregate.cpp

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/* 
 * 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.
 * 
 * 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 General Public License along 
 * with this program; if not, see <http://www.gnu.org/licenses/>
 */

#include "aggregate.h"

#include <QtCore/QWriteLocker>

using namespace Aggregation;

Aggregate *Aggregate::parentAggregate(QObject *obj)
{
    QReadLocker locker(&lock());
    return aggregateMap().value(obj);
}

QHash<QObject *, Aggregate *> &Aggregate::aggregateMap()
{
    static QHash<QObject *, Aggregate *> map;
    return map;
}

QReadWriteLock &Aggregate::lock()
{
    static QReadWriteLock lock;
    return lock;
}

Aggregate::Aggregate(QObject *parent)
    : QObject(parent)
{
    QWriteLocker locker(&lock());
    aggregateMap().insert(this, this);
}

Aggregate::~Aggregate()
{
    QWriteLocker locker(&lock());
    foreach (QObject *component, m_components) {
        disconnect(component, SIGNAL(destroyed(QObject*)), this, SLOT(deleteSelf(QObject*)));
        aggregateMap().remove(component);
    }
    qDeleteAll(m_components);
    m_components.clear();
    aggregateMap().remove(this);
}

void Aggregate::deleteSelf(QObject *obj)
{
    {
        QWriteLocker locker(&lock());
        aggregateMap().remove(obj);
        m_components.removeAll(obj);
    }
    delete this;
}

void Aggregate::add(QObject *component)
{
    if (!component)
        return;
    QWriteLocker locker(&lock());
    Aggregate *parentAggregation = aggregateMap().value(component);
    if (parentAggregation == this)
        return;
    if (parentAggregation)
        parentAggregation->remove(component);
    m_components.append(component);
    connect(component, SIGNAL(destroyed(QObject*)), this, SLOT(deleteSelf(QObject*)));
    aggregateMap().insert(component, this);
}

void Aggregate::remove(QObject *component)
{
    if (!component)
        return;
    QWriteLocker locker(&lock());
    aggregateMap().remove(component);
    m_components.removeAll(component);
    disconnect(component, SIGNAL(destroyed(QObject*)), this, SLOT(deleteSelf(QObject*)));
}