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| |
| #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 |