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/*
* Copyright (C) 2010 Nicolas Bonnefon and other contributors
*
* This file is part of glogg.
*
* glogg is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* glogg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with glogg. If not, see <http://www.gnu.org/licenses/>.
*/
#include "log.h"
#include "filewatcher.h"
#include <QStringList>
#include <QFileInfo>
FileWatcher::FileWatcher() : qtFileWatcher_( this )
{
monitoringState_ = None;
connect( &qtFileWatcher_, SIGNAL( fileChanged( const QString& ) ),
this, SLOT( fileChangedOnDisk( const QString& ) ) );
connect( &qtFileWatcher_, SIGNAL( directoryChanged( const QString& ) ),
this, SLOT( directoryChangedOnDisk( const QString& ) ) );
}
FileWatcher::~FileWatcher()
{
disconnect( &qtFileWatcher_ );
}
void FileWatcher::addFile( const QString& fileName )
{
LOG(logDEBUG) << "FileWatcher::addFile " << fileName.toStdString();
QFileInfo fileInfo = QFileInfo( fileName );
if ( fileMonitored_.isEmpty() ) {
fileMonitored_ = fileName;
// Initialise the Qt file watcher
qtFileWatcher_.addPath( fileInfo.path() );
if ( fileInfo.exists() ) {
LOG(logDEBUG) << "FileWatcher::addFile: file exists.";
qtFileWatcher_.addPath( fileName );
monitoringState_ = FileExists;
}
else {
LOG(logDEBUG) << "FileWatcher::addFile: file doesn't exist.";
monitoringState_ = FileRemoved;
}
}
else {
LOG(logWARNING) << "FileWatcher::addFile " << fileName.toStdString()
<< "- Already watching a file (" << fileMonitored_.toStdString()
<< ")!";
}
}
void FileWatcher::removeFile( const QString& fileName )
{
LOG(logDEBUG) << "FileWatcher::removeFile " << fileName.toStdString();
QFileInfo fileInfo = QFileInfo( fileName );
if ( fileName == fileMonitored_ ) {
if ( monitoringState_ == FileExists )
qtFileWatcher_.removePath( fileName );
qtFileWatcher_.removePath( fileInfo.path() );
fileMonitored_.clear();
monitoringState_ = None;
}
else {
LOG(logWARNING) << "FileWatcher::removeFile - The file is not watched!";
}
// For debug purpose:
foreach (QString str, qtFileWatcher_.files()) {
LOG(logERROR) << "File still watched: " << str.toStdString();
}
foreach (QString str, qtFileWatcher_.directories()) {
LOG(logERROR) << "Directories still watched: " << str.toStdString();
}
}
//
// Slots
//
void FileWatcher::fileChangedOnDisk( const QString& filename )
{
LOG(logDEBUG) << "FileWatcher::fileChangedOnDisk " << filename.toStdString();
if ( ( monitoringState_ == FileExists ) && ( filename == fileMonitored_ ) )
{
emit fileChanged( filename );
// If the file has been removed...
if ( !QFileInfo( filename ).exists() )
monitoringState_ = FileRemoved;
}
else
LOG(logWARNING) << "FileWatcher::fileChangedOnDisk - call from Qt but no file monitored";
}
void FileWatcher::directoryChangedOnDisk( const QString& filename )
{
LOG(logDEBUG) << "FileWatcher::directoryChangedOnDisk " << filename.toStdString();
if ( monitoringState_ == FileRemoved ) {
if ( QFileInfo( fileMonitored_ ).exists() ) {
LOG(logDEBUG) << "FileWatcher::directoryChangedOnDisk - our file reappeared!";
// The file has been recreated, we have to watch it again.
monitoringState_ = FileExists;
// Restore the Qt file watcher (automatically cancelled
// when the file is deleted)
qtFileWatcher_.addPath( fileMonitored_ );
emit fileChanged( fileMonitored_ );
}
else {
LOG(logWARNING) << "FileWatcher::directoryChangedOnDisk - not the file we are watching";
}
}
else if ( monitoringState_ == FileExists )
{
if ( ! QFileInfo( fileMonitored_ ).exists() ) {
LOG(logDEBUG) << "FileWatcher::directoryChangedOnDisk - our file disappeared!";
monitoringState_ = FileRemoved;
emit fileChanged( filename );
}
else {
LOG(logWARNING) << "FileWatcher::directoryChangedOnDisk - not the file we are watching";
}
}
}
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