src/corelib/io/qfilesystemwatcher_polling.cpp

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