annotate base/TempWriteFile.cpp @ 1671:82d03c9661f9 single-point

Rework isReady()/getCompletion() on models. Previously the new overhauled models were implementing getCompletion() but inheriting a version of isReady() (from the Model base) that didn't call it, referring only to isOK(). So they were reporting completion as soon as they had begun. Instead hoist getCompletion() to abstract base and call it from Model::isReady().

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "TempWriteFile.h"

#include "Exceptions.h"

#include <QTemporaryFile>
#include <QDir>
#include <iostream>

TempWriteFile::TempWriteFile(QString target) :
    m_target(target)
{
    QTemporaryFile temp(m_target + ".");
    temp.setAutoRemove(false);
    temp.open(); // creates the file and opens it atomically
    if (temp.error()) {
        SVCERR << "TempWriteFile: Failed to create temporary file in directory of " << m_target << ": " << temp.errorString() << endl;
        throw FileOperationFailed(temp.fileName(), "creation");
    }
    
    m_temp = temp.fileName();
    temp.close(); // does not remove the file
}

TempWriteFile::~TempWriteFile()
{
    if (m_temp != "") {
        QDir dir(QFileInfo(m_temp).dir());
        dir.remove(m_temp);
    }
}

QString
TempWriteFile::getTemporaryFilename()
{
    return m_temp;
}

void
TempWriteFile::moveToTarget()
{
    if (m_temp == "") return;

    QFile tempFile(m_temp);
    QFile targetFile(m_target);
    
    if (targetFile.exists()) {
        if (!targetFile.remove()) {
            SVCERR << "TempWriteFile: WARNING: Failed to remove existing target file " << m_target << " prior to moving temporary file " << m_temp << " to it" << endl;
        }
    }
    
    if (!tempFile.rename(m_target)) {
        SVCERR << "TempWriteFile: Failed to rename temporary file " << m_temp << " to target " << m_target << endl;
        throw FileOperationFailed(m_temp, "rename");
    }

    m_temp = "";
}