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/****************************************************************************
**
** Copyright (C) 2006-2009 fullmetalcoder <fullmetalcoder@hotmail.fr>
**
** This file is part of the Edyuk project <http://edyuk.org>
**
** This file may be used under the terms of the GNU General Public License
** version 3 as published by the Free Software Foundation and appearing in the
** file GPL.txt included in the packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include "qreliablefilewatch.h"
/*!
\file qreliablefilewatch.cpp
\brief Implementation of the QReliableFileWatch class.
*/
/*!
\class QReliableFileWatch
\brief A specialized file monitor that works around some issues in QFileSystemWatcher
*/
QReliableFileWatch::QReliableFileWatch(QObject *p)
: QFileSystemWatcher(p)
{
connect(this, SIGNAL( fileChanged(QString) ),
this, SLOT ( sourceChanged(QString) ) );
}
QReliableFileWatch::~QReliableFileWatch()
{
}
void QReliableFileWatch::addWatch(const QString& file, QObject *recipient)
{
QHash<QString, Watch>::iterator it = m_targets.find(file);
if ( it != m_targets.end() )
{
if (!it->recipients.contains(recipient))
it->recipients << recipient;
} else {
QFile f(file);
QFileInfo info(file);
Watch w;
w.state = Clean;
w.size = f.size();
w.lastModified=info.lastModified();
w.recipients << recipient;
m_targets[file] = w;
addPath(file);
}
}
void QReliableFileWatch::removeWatch(QObject *recipient)
{
removeWatch(QString(), recipient);
}
void QReliableFileWatch::removeWatch(const QString& file, QObject *recipient)
{
QHash<QString, Watch>::iterator it = m_targets.find(file);
if ( it == m_targets.end() )
{
if ( !recipient )
return;
// given recipient stop watching any file
it = m_targets.begin();
while ( it != m_targets.end() )
{
int n = it->recipients.removeAll(recipient);
if ( n && it->recipients.isEmpty() )
{
// no more recipients watching this file
removePath(it.key());
it = m_targets.erase(it);
} else {
++it;
}
}
} else {
if ( recipient )
{
// given recipient stops watching given file
it->recipients.removeAll(recipient);
if ( it->recipients.isEmpty() )
{
// no more recipients watching this file
removePath(it.key());
m_targets.erase(it);
}
} else {
// stop watching given file at all
removePath(it.key());
m_targets.erase(it);
}
}
}
void QReliableFileWatch::timerEvent(QTimerEvent *e)
{
if ( e->timerId() != m_timer.timerId() )
return QFileSystemWatcher::timerEvent(e);
int postponedEmissions = 0;
QHash<QString, Watch> targets=m_targets; //copy targets, so m_targets can be modified from the invoken functions without crashing
QHash<QString, Watch>::iterator it = targets.begin();
while ( it != targets.end() )
{
if ( it->state & Duplicate )
{
// postpone signal emission...
++postponedEmissions;
} else if ( it->state & Recent ) {
// // send signal
// it->state = Clean;
/*
QFile f(it.key());
if ( f.size() == (unsigned int)(it->size) )
{
// TODO : avoid signal emission if checksum match
// DO this in editor or here?
}*/
//qDebug("%s emission.", qPrintable(it.key()));
it->recipients.removeAll(0);
foreach ( QObject *r, it->recipients )
QMetaObject::invokeMethod(r, "fileChanged", Q_ARG(QString, it.key()));
//it = m_state.erase(it);
}
++it;
}
m_timer.stop();
if ( postponedEmissions )
{
//remove duplicates from the real hash
it = m_targets.begin();
while (it != m_targets.end()) {
if ( it->state & Duplicate )
it->state = Recent;
++it;
}
//qDebug("%i postponed emissions", postponedEmissions);
m_timer.start(20, this);
} else {
//remove changes from the real hash
it = m_targets.begin();
while (it != m_targets.end()) {
if ( it->state & Recent )
it->state = Clean;
++it;
}
}
}
void QReliableFileWatch::sourceChanged(const QString& filepath)
{
m_timer.stop();
QHash<QString, Watch>::iterator it = m_targets.find(filepath);
if ( it == m_targets.end() )
return;
qDebug("%s modified.", qPrintable(filepath));
QFileInfo info(filepath);
if(it->lastModified==info.lastModified()){
qDebug("filtered");
return;
}
if ( it->state )
{
it->state = Recent | Duplicate;
} else {
it->state = Recent;
}
m_timer.start(20, this);
}
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