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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006 Chris Cannam.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #ifndef _DATA_FILE_READER_H_
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17 #define _DATA_FILE_READER_H_
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18
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19 #include <QString>
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20 #include <QObject>
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21
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22 class Model;
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23
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24 class DataFileReader : public QObject
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25 {
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26 public:
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27 /**
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28 * Return true if the file appears to be of the correct type.
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29 *
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30 * The DataFileReader will be constructed by passing a file path
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31 * to its constructor. If the file can at that time be determined
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32 * to be not of a type that this reader can read, it should return
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33 * false in response to any subsequent call to isOK().
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34 *
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35 * If the file is apparently of the correct type, isOK() should
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36 * return true; if it turns out that the file cannot after all be
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37 * read (because it's corrupted or the detection misfired), then
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38 * the read() function may return NULL.
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39 */
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40 virtual bool isOK() const = 0;
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41
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42 virtual QString getError() const { return ""; }
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43
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44 /**
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45 * Read the file and return the corresponding data model. This
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46 * function is not expected to be thread-safe or reentrant. This
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47 * function may be interactive (i.e. it's permitted to pop up
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48 * dialogs and windows and ask the user to specify any details
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49 * that can't be automatically extracted from the file).
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50 *
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51 * Return NULL if the file cannot be parsed at all (although it's
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52 * preferable to return a partial model and warn the user).
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53 *
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54 * Caller owns the returned model and must delete it after use.
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55 */
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56 virtual Model *load() const = 0;
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57 };
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58
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59 #endif
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