forked from qt-creator/qt-creator
107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
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/**************************************************************************
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**
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** This file is part of Qt Creator
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**
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** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (info@qt.nokia.com)
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**
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**
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** GNU Lesser General Public License Usage
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**
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** Other Usage
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**
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**************************************************************************/
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#include "savefile.h"
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#include "qtcassert.h"
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#include <QtCore/QFileInfo>
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#include <QtCore/QTemporaryFile>
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namespace Utils {
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SaveFile::SaveFile(const QString &filename)
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{
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m_finalFileName = filename;
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m_finalized = false;
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m_backup = false;
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}
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SaveFile::~SaveFile()
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{
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QTC_ASSERT(m_finalized, rollback());
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}
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bool SaveFile::open(OpenMode flags)
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{
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QTC_ASSERT(!m_finalFileName.isEmpty() && fileName().isEmpty(), return false);
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QFile ofi(m_finalFileName);
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// Check whether the existing file is writable
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if (ofi.exists() && !ofi.open(QIODevice::ReadWrite)) {
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setErrorString(ofi.errorString());
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return false;
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}
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setAutoRemove(false);
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setFileTemplate(m_finalFileName);
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if (!QTemporaryFile::open(flags))
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return false;
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if (ofi.exists())
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setPermissions(ofi.permissions()); // Ignore errors
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return true;
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}
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void SaveFile::rollback()
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{
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remove();
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m_finalized = true;
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}
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bool SaveFile::commit()
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{
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QTC_ASSERT(!m_finalized, return false);
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m_finalized = true;
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close();
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if (error() != NoError) {
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remove();
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return false;
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}
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QString bakname = m_finalFileName + QLatin1Char('~');
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QFile::remove(bakname); // Kill old backup
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QFile::rename(m_finalFileName, bakname); // Backup current file
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if (!rename(m_finalFileName)) { // Replace current file
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QFile::rename(bakname, m_finalFileName); // Rollback to current file
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return false;
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}
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if (!m_backup)
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QFile::remove(bakname);
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return true;
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}
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} // namespace Utils
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