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/****************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#pragma once
#include <qmldesignercorelib_global.h>
#include <model.h>
#include <utils/optional.h>
#include <QHash>
#include <QQueue>
namespace QmlDesigner {
template<class DataType>
class ModelCache
{
public:
ModelCache(int max = 20)
: m_maxEntries(max)
{}
void insert(Model *model, const DataType &data)
{
QObject::connect(model, &Model::destroyed, [this](QObject *o) {
QObject *deletedModel = o;
if (deletedModel) {
m_content.remove(deletedModel);
m_queue.removeAll(deletedModel);
}
});
m_content.insert(model, data);
if (!m_queue.contains(model))
m_queue.append(model);
if (m_queue.length() > m_maxEntries) {
QObject *first = m_queue.takeFirst();
m_content.remove(first);
}
}
Utils::optional<DataType> take(Model *model)
{
if (!m_content.contains(model))
return {};
m_queue.removeOne(model);
return m_content.take(model);
}
private:
QHash<QObject *, DataType> m_content;
QQueue<QObject *> m_queue;
int m_maxEntries = 20;
};
} // namespace QmlDesigner
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