view document/SVFileReader.h @ 45:6b6bca31ad53

* When setting a new model on a layer, don't delete the old one until after
  the new one has been set (a layer's setModel may want to compare against the
  old one, as WaveformLayer does)

/* -*- 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 _SV_FILE_READER_H_
#define _SV_FILE_READER_H_

#include "layer/LayerFactory.h"
#include "transform/Transform.h"
#include "transform/PluginTransform.h"

#include <QXmlDefaultHandler>

#include <map>

class Pane;
class Model;
class Document;
class PlayParameters;

class SVFileReaderPaneCallback
{
public:
    virtual Pane *addPane() = 0;
    virtual void setWindowSize(int width, int height) = 0;
    virtual void addSelection(int start, int end) = 0;
};

class SVFileReader : public QXmlDefaultHandler
{
public:
    SVFileReader(Document *document,
		 SVFileReaderPaneCallback &callback);
    virtual ~SVFileReader();

    void parse(const QString &xmlData);
    void parse(QXmlInputSource &source);

    bool isOK();
    QString getErrorString() const { return m_errorString; }

    // For loading a single layer onto an existing pane
    void setCurrentPane(Pane *pane) { m_currentPane = pane; }
    
    virtual bool startElement(const QString &namespaceURI,
			      const QString &localName,
			      const QString &qName,
			      const QXmlAttributes& atts);

    virtual bool characters(const QString &);

    virtual bool endElement(const QString &namespaceURI,
			    const QString &localName,
			    const QString &qName);

    bool error(const QXmlParseException &exception);
    bool fatalError(const QXmlParseException &exception);

protected:
    bool readWindow(const QXmlAttributes &);
    bool readModel(const QXmlAttributes &);
    bool readView(const QXmlAttributes &);
    bool readLayer(const QXmlAttributes &);
    bool readDatasetStart(const QXmlAttributes &);
    bool addBinToDataset(const QXmlAttributes &);
    bool addPointToDataset(const QXmlAttributes &);
    bool addRowToDataset(const QXmlAttributes &);
    bool readRowData(const QString &);
    bool readDerivation(const QXmlAttributes &);
    bool readPlayParameters(const QXmlAttributes &);
    bool readPlugin(const QXmlAttributes &);
    bool readSelection(const QXmlAttributes &);
    void addUnaddedModels();

    Document *m_document;
    SVFileReaderPaneCallback &m_paneCallback;
    Pane *m_currentPane;
    std::map<int, Layer *> m_layers;
    std::map<int, Model *> m_models;
    std::set<Model *> m_addedModels;
    std::map<int, int> m_awaitingDatasets; // map dataset id -> model id
    Model *m_currentDataset;
    Model *m_currentDerivedModel;
    PlayParameters *m_currentPlayParameters;
    QString m_currentTransform;
    PluginTransform::ExecutionContext m_currentTransformContext;
    QString m_currentTransformConfiguration;
    QString m_datasetSeparator;
    bool m_inRow;
    bool m_inView;
    bool m_inData;
    bool m_inSelections;
    int m_rowNumber;
    QString m_errorString;
    bool m_ok;
};

#endif