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/****************************************************************************
**
** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include "stringtoint_p.h"
#include <QMutex>
#include <QReadWriteLock>
#include <QHash>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
namespace {
struct StringToIntCache
{
QReadWriteLock lock;
QHash<QString, int> map = QHash<QString, int>();
QVector<QString> reverseMap = QVector<QString>();
static StringToIntCache& instance()
{
static StringToIntCache c;
return c;
}
};
} // anonymous
int StringToInt::lookupId(QLatin1String str)
{
// ### optimize me
return lookupId(QString(str));
}
int StringToInt::lookupId(const QString &str)
{
auto& cache = StringToIntCache::instance();
int idx;
{
QReadLocker readLocker(&cache.lock);
idx = cache.map.value(str, -1);
}
if (Q_UNLIKELY(idx < 0)) {
QWriteLocker writeLocker(&cache.lock);
idx = cache.map.value(str, -1);
if (idx < 0) {
idx = cache.reverseMap.size();
Q_ASSERT(cache.map.size() == cache.reverseMap.size());
cache.map.insert(str, idx);
cache.reverseMap.append(str);
}
}
return idx;
}
QString StringToInt::lookupString(int idx)
{
auto& cache = StringToIntCache::instance();
QReadLocker readLocker(&cache.lock);
if (Q_LIKELY(cache.reverseMap.size() > idx))
return cache.reverseMap.at(idx);
return QString();
}
} // Render
} // Qt3DRender
QT_END_NAMESPACE
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