Chris@674: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@674: 
Chris@674: /*
Chris@674:     Sonic Visualiser
Chris@674:     An audio file viewer and annotation editor.
Chris@674:     Centre for Digital Music, Queen Mary, University of London.
Chris@674:     
Chris@674:     This program is free software; you can redistribute it and/or
Chris@674:     modify it under the terms of the GNU General Public License as
Chris@674:     published by the Free Software Foundation; either version 2 of the
Chris@674:     License, or (at your option) any later version.  See the file
Chris@674:     COPYING included with this distribution for more information.
Chris@674: */
Chris@674: 
Chris@674: #include "TempWriteFile.h"
Chris@674: 
Chris@674: #include "Exceptions.h"
Chris@674: 
Chris@674: #include <QTemporaryFile>
Chris@674: #include <QDir>
Chris@674: #include <iostream>
Chris@674: 
Chris@674: TempWriteFile::TempWriteFile(QString target) :
Chris@674:     m_target(target)
Chris@674: {
Chris@674:     QTemporaryFile temp(m_target + ".");
Chris@674:     temp.setAutoRemove(false);
Chris@674:     temp.open(); // creates the file and opens it atomically
Chris@674:     if (temp.error()) {
Chris@674: 	std::cerr << "TempWriteFile: Failed to create temporary file in directory of " << m_target.toStdString() << ": " << temp.errorString().toStdString() << std::endl;
Chris@674: 	throw FileOperationFailed(temp.fileName(), "creation");
Chris@674:     }
Chris@674:     
Chris@674:     m_temp = temp.fileName();
Chris@675:     temp.close(); // does not remove the file
Chris@674: }
Chris@674: 
Chris@674: TempWriteFile::~TempWriteFile()
Chris@674: {
Chris@674:     if (m_temp != "") {
Chris@674: 	QDir dir(QFileInfo(m_temp).dir());
Chris@674: 	dir.remove(m_temp);
Chris@674:     }
Chris@674: }
Chris@674: 
Chris@674: QString
Chris@674: TempWriteFile::getTemporaryFilename()
Chris@674: {
Chris@674:     return m_temp;
Chris@674: }
Chris@674: 
Chris@674: void
Chris@674: TempWriteFile::moveToTarget()
Chris@674: {
Chris@674:     if (m_temp == "") return;
Chris@674: 
Chris@674:     QDir dir(QFileInfo(m_temp).dir());
Chris@674:     // According to  http://doc.trolltech.com/4.4/qdir.html#rename
Chris@674:     // some systems fail, if renaming over an existing file.
Chris@674:     // Therefore, delete first the existing file.
Chris@674:     if (dir.exists(m_target)) dir.remove(m_target);
Chris@674:     if (!dir.rename(m_temp, m_target)) {
Chris@674: 	std::cerr << "TempWriteFile: Failed to rename temporary file " << m_temp.toStdString() << " to target " << m_target.toStdString() << std::endl;
Chris@674: 	throw FileOperationFailed(m_temp, "rename");
Chris@674:     }
Chris@674: 
Chris@674:     m_temp = "";
Chris@674: }
Chris@674: