view data/fileio/DataFileReaderFactory.h @ 1376:d9511f9e04d7 dev/refactor-piper-related

Introduce some POD structs for describing an external server application and the desired libraries to load from it, and disambiguating between empty list request and invalid list request. This allows for overriding PiperVampPluginFactory behaviour for using a PluginScan to populate the list request.

/* -*- 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.
*/

#ifndef _DATA_FILE_READER_FACTORY_H_
#define _DATA_FILE_READER_FACTORY_H_

#include <QString>

#include "CSVFormat.h"
#include "MIDIFileReader.h"

class DataFileReader;
class Model;

class DataFileReaderFactory
{
public:
    enum Exception { ImportCancelled };

    /**
     * Return the file extensions that we have data file readers for,
     * in a format suitable for use with QFileDialog.  For example,
     * "*.csv *.xml".
     */
    static QString getKnownExtensions();

    /**
     * Return a data file reader initialised to the file at the
     * given path, or NULL if no suitable reader for this path is
     * available or the file cannot be opened.
     *
     * Caller owns the returned object and must delete it after use.
     * 
     * Note that this function is non-interactive -- the user is not
     * asked for file format preferences.
     */
    static DataFileReader *createReader(QString path,
                                        MIDIFileImportPreferenceAcquirer *,
					sv_samplerate_t mainModelSampleRate);

    /**
     * Read the given path, if a suitable reader is available.
     * Return NULL if no reader succeeded in reading this file.
     * 
     * Note that this function is non-interactive -- the user is not
     * asked for file format preferences.  If the CSV file reader is
     * used, it is with default format.
     */
    static Model *load(QString path,
                       MIDIFileImportPreferenceAcquirer *acquirer,
                       sv_samplerate_t mainModelSampleRate);

    /**
     * Read the given path, if a suitable reader is available.
     * Return NULL if no reader succeeded in reading this file.
     * Do not attempt the general CSV reader.
     */
    static Model *loadNonCSV(QString path,
                             MIDIFileImportPreferenceAcquirer *acquirer,
                             sv_samplerate_t mainModelSampleRate);

    /**
     * Read the given path using the CSV reader with the given format.
     * Return NULL if it failed in reading this file.
     */
    static Model *loadCSV(QString path,
                          CSVFormat format,
                          sv_samplerate_t mainModelSampleRate);

protected:
    static DataFileReader *createReader(QString path, bool csv,
                                        MIDIFileImportPreferenceAcquirer *,
                                        CSVFormat format,
					sv_samplerate_t mainModelSampleRate);
};

#endif