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39
40#include "stringtoint_p.h"
41#include <QMutex>
42#include <QReadWriteLock>
43#include <QHash>
44
45QT_BEGIN_NAMESPACE
46
47namespace Qt3DRender {
48
49namespace Render {
50
51namespace {
52
53struct StringToIntCache
54{
55 QReadWriteLock lock;
56 QHash<QString, int> map = QHash<QString, int>();
57 QVector<QString> reverseMap = QVector<QString>();
58
59 static StringToIntCache& instance()
60 {
61 static StringToIntCache c;
62 return c;
63 }
64};
65
66} // anonymous
67
68int StringToInt::lookupId(QLatin1String str)
69{
70 // ### optimize me
71 return lookupId(str: QString(str));
72}
73
74int StringToInt::lookupId(const QString &str)
75{
76 auto& cache = StringToIntCache::instance();
77 int idx;
78 {
79 QReadLocker readLocker(&cache.lock);
80 idx = cache.map.value(akey: str, adefaultValue: -1);
81 }
82
83 if (Q_UNLIKELY(idx < 0)) {
84 QWriteLocker writeLocker(&cache.lock);
85 idx = cache.map.value(akey: str, adefaultValue: -1);
86 if (idx < 0) {
87 idx = cache.reverseMap.size();
88 Q_ASSERT(cache.map.size() == cache.reverseMap.size());
89 cache.map.insert(akey: str, avalue: idx);
90 cache.reverseMap.append(t: str);
91 }
92 }
93 return idx;
94}
95
96QString StringToInt::lookupString(int idx)
97{
98 auto& cache = StringToIntCache::instance();
99 QReadLocker readLocker(&cache.lock);
100 if (Q_LIKELY(cache.reverseMap.size() > idx))
101 return cache.reverseMap.at(i: idx);
102
103 return QString();
104}
105
106} // Render
107
108} // Qt3DRender
109
110QT_END_NAMESPACE
111

source code of qt3d/src/render/backend/stringtoint.cpp