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/*
Scan Tailor - Interactive post-processing tool for scanned pages.
Copyright (C) 2007-2008 Joseph Artsimovich <joseph_a@mail.ru>
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "AtomicFileOverwriter.h"
#include "Utils.h"
#include <QString>
#include <QFile>
#include <QTemporaryFile>
AtomicFileOverwriter::AtomicFileOverwriter()
{
}
AtomicFileOverwriter::~AtomicFileOverwriter()
{
abort();
}
QIODevice*
AtomicFileOverwriter::startWriting(QString const& file_path)
{
abort();
m_ptrTempFile.reset(new QTemporaryFile(file_path));
m_ptrTempFile->setAutoRemove(false);
if (!m_ptrTempFile->open()) {
m_ptrTempFile.reset();
}
return m_ptrTempFile.get();
}
bool
AtomicFileOverwriter::commit()
{
if (!m_ptrTempFile.get()) {
return false;
}
QString const temp_file_path(m_ptrTempFile->fileName());
QString const target_path(m_ptrTempFile->fileTemplate());
// Yes, we have to destroy this object here, because:
// 1. Under Windows, open files can't be renamed or deleted.
// 2. QTemporaryFile::close() doesn't really close it.
m_ptrTempFile.reset();
if (!Utils::overwritingRename(temp_file_path, target_path)) {
QFile::remove(temp_file_path);
return false;
}
return true;
}
void
AtomicFileOverwriter::abort()
{
if (!m_ptrTempFile.get()) {
return;
}
QString const temp_file_path(m_ptrTempFile->fileName());
m_ptrTempFile.reset(); // See comments in commit()
QFile::remove(temp_file_path);
}