src/corelib/io/qfilesystemwatcher_polling.cpp

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