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39
40#include "qfilesystemwatcher_polling_p.h"
41#include <QtCore/qscopeguard.h>
42#include <QtCore/qtimer.h>
43
44QT_BEGIN_NAMESPACE
45
46QPollingFileSystemWatcherEngine::QPollingFileSystemWatcherEngine(QObject *parent)
47 : QFileSystemWatcherEngine(parent),
48 timer(this)
49{
50 connect(&timer, SIGNAL(timeout()), SLOT(timeout()));
51}
52
53QStringList QPollingFileSystemWatcherEngine::addPaths(const QStringList &paths,
54 QStringList *files,
55 QStringList *directories)
56{
57 QStringList unhandled;
58 for (const QString &path : paths) {
59 auto sg = qScopeGuard([&]{ unhandled.push_back(path); });
60 QFileInfo fi(path);
61 if (!fi.exists())
62 continue;
63 if (fi.isDir()) {
64 if (directories->contains(path))
65 continue;
66 directories->append(path);
67 if (!path.endsWith(QLatin1Char('/')))
68 fi = QFileInfo(path + QLatin1Char('/'));
69 this->directories.insert(path, fi);
70 } else {
71 if (files->contains(path))
72 continue;
73 files->append(path);
74 this->files.insert(path, fi);
75 }
76 sg.dismiss();
77 }
78
79 if ((!this->files.isEmpty() ||
80 !this->directories.isEmpty()) &&
81 !timer.isActive()) {
82 timer.start(PollingInterval);
83 }
84
85 return unhandled;
86}
87
88QStringList QPollingFileSystemWatcherEngine::removePaths(const QStringList &paths,
89 QStringList *files,
90 QStringList *directories)
91{
92 QStringList unhandled;
93 for (const QString &path : paths) {
94 if (this->directories.remove(path)) {
95 directories->removeAll(path);
96 } else if (this->files.remove(path)) {
97 files->removeAll(path);
98 } else {
99 unhandled.push_back(path);
100 }
101 }
102
103 if (this->files.isEmpty() &&
104 this->directories.isEmpty()) {
105 timer.stop();
106 }
107
108 return unhandled;
109}
110
111void QPollingFileSystemWatcherEngine::timeout()
112{
113 for (auto it = files.begin(), end = files.end(); it != end; /*erasing*/) {
114 QString path = it.key();
115 QFileInfo fi(path);
116 if (!fi.exists()) {
117 it = files.erase(it);
118 emit fileChanged(path, true);
119 continue;
120 } else if (it.value() != fi) {
121 it.value() = fi;
122 emit fileChanged(path, false);
123 }
124 ++it;
125 }
126
127 for (auto it = directories.begin(), end = directories.end(); it != end; /*erasing*/) {
128 QString path = it.key();
129 QFileInfo fi(path);
130 if (!path.endsWith(QLatin1Char('/')))
131 fi = QFileInfo(path + QLatin1Char('/'));
132 if (!fi.exists()) {
133 it = directories.erase(it);
134 emit directoryChanged(path, true);
135 continue;
136 } else if (it.value() != fi) {
137 fi.refresh();
138 if (!fi.exists()) {
139 it = directories.erase(it);
140 emit directoryChanged(path, true);
141 continue;
142 } else {
143 it.value() = fi;
144 emit directoryChanged(path, false);
145 }
146 }
147 ++it;
148 }
149}
150
151QT_END_NAMESPACE
152
153#include "moc_qfilesystemwatcher_polling_p.cpp"
154