comparison data/fileio/DataFileReader.h @ 148:1a42221a1522

* Reorganising code base.  This revision will not compile.

+/* -*- 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_H_
+#define _DATA_FILE_READER_H_
+
+#include <QString>
+
+class Model;
+
+class DataFileReader
+{
+public:
+    /**
+     * Return true if the file appears to be of the correct type.
+     *
+     * The DataFileReader will be constructed by passing a file path
+     * to its constructor.  If the file can at that time be determined
+     * to be not of a type that this reader can read, it should return
+     * false in response to any subsequent call to isOK().
+     *
+     * If the file is apparently of the correct type, isOK() should
+     * return true; if it turns out that the file cannot after all be
+     * read (because it's corrupted or the detection misfired), then
+     * the read() function may return NULL.
+     */
+    virtual bool isOK() const = 0;
+
+    virtual QString getError() const { return ""; }
+
+    /**
+     * Read the file and return the corresponding data model.  This
+     * function is not expected to be thread-safe or reentrant.  This
+     * function may be interactive (i.e. it's permitted to pop up
+     * dialogs and windows and ask the user to specify any details
+     * that can't be automatically extracted from the file).
+     *
+     * Return NULL if the file cannot be parsed at all (although it's
+     * preferable to return a partial model and warn the user).
+     *
+     * Caller owns the returned model and must delete it after use.
+     */
+    virtual Model *load() const = 0;
+};
+
+#endif