view data/fileio/CSVFileWriter.cpp @ 1752:6d09d68165a4 by-id

Further review of ById: make IDs only available when adding a model to the ById store, not by querying the item directly. This means any id encountered in the wild must have been added to the store at some point (even if later released), which simplifies reasoning about lifecycles

/* -*- 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 file copyright 2006 Chris Cannam.
    
    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 "CSVFileWriter.h"
#include "CSVStreamWriter.h"

#include "model/Model.h"
#include "model/SparseOneDimensionalModel.h"
#include "model/SparseTimeValueModel.h"
#include "model/NoteModel.h"
#include "model/TextModel.h"

#include "base/TempWriteFile.h"
#include "base/Exceptions.h"
#include "base/Selection.h"

#include <QFile>
#include <QTextStream>
#include <exception>

CSVFileWriter::CSVFileWriter(QString path,
                             Model *model,
                             QString delimiter,
                             DataExportOptions options) :
    m_path(path),
    m_model(model),
    m_error(""),
    m_delimiter(delimiter),
    m_options(options)
{
}

CSVFileWriter::~CSVFileWriter()
{
}

bool
CSVFileWriter::isOK() const
{
    return m_error == "";
}

QString
CSVFileWriter::getError() const
{
    return m_error;
}

void
CSVFileWriter::write()
{
    Selection all {
        m_model->getStartFrame(),
        m_model->getEndFrame()
    };
    MultiSelection selections;
    selections.addSelection(all);
    writeSelection(selections); 
}

void
CSVFileWriter::writeSelection(MultiSelection selection)
{
    try {
        TempWriteFile temp(m_path);

        QFile file(temp.getTemporaryFilename());
        if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
            m_error = tr("Failed to open file %1 for writing")
                .arg(temp.getTemporaryFilename());
            return;
        }
    
        QTextStream out(&file);

        sv_frame_t blockSize = 65536;

        if (m_model->isSparse()) {
            // Write the whole in one go, as re-seeking for each block
            // may be very costly otherwise
            sv_frame_t startFrame, endFrame;
            selection.getExtents(startFrame, endFrame);
            blockSize = endFrame - startFrame;
        }
        
        bool completed = CSVStreamWriter::writeInChunks(
            out,
            *m_model,
            selection,
            m_reporter,
            m_delimiter,
            m_options,
            blockSize
        );

        file.close();
        if (completed) {
            temp.moveToTarget();
        }

    } catch (FileOperationFailed &f) {
        m_error = f.what();
    } catch (const std::exception &e) { // ProgressReporter could throw
        m_error = e.what();
    }
}