annotate data/model/SparseModel.h @ 1455:ec9e65fcf749

The use of the begin/end pairs here just seems to cause too many rows to be deleted (from the visual representation, not the underlying model). Things apparently work better if we just modify the underlying model and let the change signals percolate back up again. To that end, update the change handlers so as to cover their proper ranges with dataChanged signals.

/* -*- 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_SPARSE_MODEL_H
#define SV_SPARSE_MODEL_H

#include "Model.h"
#include "TabularModel.h"
#include "base/Command.h"
#include "base/RealTime.h"
#include "system/System.h"

#include <iostream>

#include <set>
#include <vector>
#include <algorithm>
#include <iterator>

#include <cmath>

#include <QMutex>
#include <QTextStream>

/**
 * Model containing sparse data (points with some properties).  The
 * properties depend on the point type.
 */

template <typename PointType>
class SparseModel : public Model,
                    public TabularModel
{
public:
    SparseModel(sv_samplerate_t sampleRate, int resolution,
                bool notifyOnAdd = true);
    virtual ~SparseModel() { }
    
    virtual bool isOK() const { return true; }
    virtual sv_frame_t getStartFrame() const;
    virtual sv_frame_t getEndFrame() const;
    virtual sv_samplerate_t getSampleRate() const { return m_sampleRate; }

    // Number of frames of the underlying sample rate that this model
    // is capable of resolving to.  For example, if m_resolution == 10
    // then every point in this model will be at a multiple of 10
    // sample frames and should be considered to cover a window ending
    // 10 sample frames later.
    virtual int getResolution() const {
        return m_resolution ? m_resolution : 1;
    }
    virtual void setResolution(int resolution);
    
    typedef PointType Point;
    typedef std::multiset<PointType,
                          typename PointType::OrderComparator> PointList;
    typedef typename PointList::iterator PointListIterator;
    typedef typename PointList::const_iterator PointListConstIterator;

    /**
     * Return whether the model is empty or not.
     */
    virtual bool isEmpty() const;

    /**
     * Get the total number of points in the model.
     */
    virtual int getPointCount() const;

    /**
     * Get all points.
     */
    virtual const PointList &getPoints() const;

    /**
     * Get all of the points in this model between the given
     * boundaries (in frames), as well as up to two points before and
     * after the boundaries.  If you need exact boundaries, check the
     * point coordinates in the returned list.
     */
    virtual PointList getPoints(sv_frame_t start, sv_frame_t end) const;

    /**
     * Get all points that cover the given frame number, taking the
     * resolution of the model into account.
     */
    virtual PointList getPoints(sv_frame_t frame) const;

    /**
     * Return all points that share the nearest frame number prior to
     * the given one at which there are any points.
     */
    virtual PointList getPreviousPoints(sv_frame_t frame) const;

    /**
     * Return all points that share the nearest frame number
     * subsequent to the given one at which there are any points.
     */
    virtual PointList getNextPoints(sv_frame_t frame) const;

    /**
     * Remove all points.
     */
    virtual void clear();

    /**
     * Add a point.
     */
    virtual void addPoint(const PointType &point);

    /** 
     * Remove a point.  Points are not necessarily unique, so this
     * function will remove the first point that compares equal to the
     * supplied one using Point::Comparator.  Other identical points
     * may remain in the model.
     */
    virtual void deletePoint(const PointType &point);

    /**
     * Return true if the given point is found in this model, false
     * otherwise.
     */
    virtual bool containsPoint(const PointType &point);
    
    virtual bool isReady(int *completion = 0) const {
        bool ready = isOK() && (m_completion == 100);
        if (completion) *completion = m_completion;
        return ready;
    }

    virtual void setCompletion(int completion, bool update = true);
    virtual int getCompletion() const { return m_completion; }

    virtual bool hasTextLabels() const { return m_hasTextLabels; }

    virtual bool isSparse() const { return true; }

    QString getTypeName() const { return tr("Sparse"); }

    virtual QString getXmlOutputType() const { return "sparse"; }

    virtual void toXml(QTextStream &out,
                       QString indent = "",
                       QString extraAttributes = "") const;

    virtual QString toDelimitedDataString(QString delimiter) const {
        return toDelimitedDataStringWithOptions
            (delimiter, DataExportDefaults);
    }

    virtual QString toDelimitedDataStringWithOptions(QString delimiter,
                                                     DataExportOptions opts) const {
        return toDelimitedDataStringSubsetWithOptions
            (delimiter, opts,
             std::min(getStartFrame(), sv_frame_t(0)), getEndFrame());
    }

    virtual QString toDelimitedDataStringSubset(QString delimiter, sv_frame_t f0, sv_frame_t f1) const {
        return toDelimitedDataStringSubsetWithOptions
            (delimiter, DataExportDefaults, f0, f1);
    }

    virtual QString toDelimitedDataStringSubsetWithOptions(QString delimiter, DataExportOptions opts, sv_frame_t f0, sv_frame_t f1) const {
        if (opts & DataExportFillGaps) {
            return toDelimitedDataStringSubsetFilled(delimiter, opts, f0, f1);
        } else {
            QString s;
            for (PointListConstIterator i = m_points.begin(); i != m_points.end(); ++i) {
                if (i->frame >= f0 && i->frame < f1) {
                    s += i->toDelimitedDataString(delimiter, opts, m_sampleRate) + "\n";
                }
            }
            return s;
        }
    }

    /**
     * Command to add a point, with undo.
     */
    class AddPointCommand : public Command
    {
    public:
        AddPointCommand(SparseModel<PointType> *model,
                        const PointType &point,
                        QString name = "") :
            m_model(model), m_point(point), m_name(name) { }

        virtual QString getName() const {
            return (m_name == "" ? tr("Add Point") : m_name);
        }

        virtual void execute() { m_model->addPoint(m_point); }
        virtual void unexecute() { m_model->deletePoint(m_point); }

        const PointType &getPoint() const { return m_point; }

    private:
        SparseModel<PointType> *m_model;
        PointType m_point;
        QString m_name;
    };


    /**
     * Command to remove a point, with undo.
     */
    class DeletePointCommand : public Command
    {
    public:
        DeletePointCommand(SparseModel<PointType> *model,
                           const PointType &point) :
            m_model(model), m_point(point) { }

        virtual QString getName() const { return tr("Delete Point"); }

        virtual void execute() { m_model->deletePoint(m_point); }
        virtual void unexecute() { m_model->addPoint(m_point); }

        const PointType &getPoint() const { return m_point; }

    private:
        SparseModel<PointType> *m_model;
        PointType m_point;
    };

    
    /**
     * Command to add or remove a series of points, with undo.
     * Consecutive add/remove pairs for the same point are collapsed.
     */
    class EditCommand : public MacroCommand
    {
    public:
        EditCommand(SparseModel<PointType> *model, QString commandName);

        virtual void addPoint(const PointType &point);
        virtual void deletePoint(const PointType &point);

        /**
         * Stack an arbitrary other command in the same sequence.
         */
        virtual void addCommand(Command *command) { addCommand(command, true); }

        /**
         * If any points have been added or deleted, return this
         * command (so the caller can add it to the command history).
         * Otherwise delete the command and return NULL.
         */
        virtual EditCommand *finish();

    protected:
        virtual void addCommand(Command *command, bool executeFirst);

        SparseModel<PointType> *m_model;
    };


    /**
     * Command to relabel a point.
     */
    class RelabelCommand : public Command
    {
    public:
        RelabelCommand(SparseModel<PointType> *model,
                       const PointType &point,
                       QString newLabel) :
            m_model(model), m_oldPoint(point), m_newPoint(point) {
            m_newPoint.label = newLabel;
        }

        virtual QString getName() const { return tr("Re-Label Point"); }

        virtual void execute() { 
            m_model->deletePoint(m_oldPoint);
            m_model->addPoint(m_newPoint);
            std::swap(m_oldPoint, m_newPoint);
        }

        virtual void unexecute() { execute(); }

    private:
        SparseModel<PointType> *m_model;
        PointType m_oldPoint;
        PointType m_newPoint;
    };

    /**
     * TabularModel methods.  
     */

    virtual int getRowCount() const
    {
        return int(m_points.size());
    }

    virtual sv_frame_t getFrameForRow(int row) const
    {
        PointListConstIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return 0;
        return i->frame;
    }

    virtual int getRowForFrame(sv_frame_t frame) const
    {
        if (m_rows.empty()) rebuildRowVector();
        std::vector<sv_frame_t>::iterator i =
            std::lower_bound(m_rows.begin(), m_rows.end(), frame);
        ssize_t row = std::distance(m_rows.begin(), i);
        if (i != m_rows.begin() && (i == m_rows.end() || *i != frame)) {
            --row;
        }
        return int(row);
    }

    virtual int getColumnCount() const { return 1; }
    virtual QVariant getData(int row, int column, int role) const
    {
        PointListConstIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) {
//            cerr << "no iterator for row " << row << " (have " << getRowCount() << " rows)" << endl;
            return QVariant();
        }

//        cerr << "returning data for row " << row << " col " << column << endl;
        
        switch (column) {
        case 0: {
            if (role == SortRole) return int(i->frame);
            RealTime rt = RealTime::frame2RealTime(i->frame, getSampleRate());
            if (role == Qt::EditRole) return rt.toString().c_str();
            else return rt.toText().c_str();
        }
        case 1: return int(i->frame);
        }

        return QVariant();
    }

    virtual Command *getSetDataCommand(int row, int column,
                                       const QVariant &value, int role)
    {
        if (role != Qt::EditRole) return 0;
        PointListIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return 0;
        EditCommand *command = new EditCommand(this, tr("Edit Data"));

        Point point(*i);
        command->deletePoint(point);

        switch (column) {
        case 0: point.frame = lrint(value.toDouble() * getSampleRate()); break;
        case 1: point.frame = value.toInt(); break; 
        }

        command->addPoint(point);
        return command->finish();
    }

    virtual Command *getInsertRowCommand(int row)
    {
        EditCommand *command = new EditCommand(this, tr("Insert Data Point"));
        Point point(0);
        PointListIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end() && i != m_points.begin()) --i;
        if (i != m_points.end()) point = *i;
        command->addPoint(point);
        return command->finish();
    }
            
    virtual Command *getRemoveRowCommand(int row)
    {
        PointListIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return 0;
        EditCommand *command = new EditCommand(this, tr("Delete Data Point"));
        command->deletePoint(*i);
        return command->finish();
    }
            
protected:
    sv_samplerate_t m_sampleRate;
    int m_resolution;
    bool m_notifyOnAdd;
    sv_frame_t m_sinceLastNotifyMin;
    sv_frame_t m_sinceLastNotifyMax;
    bool m_hasTextLabels;

    PointList m_points;
    int m_pointCount;
    mutable QMutex m_mutex;
    int m_completion;

    void getPointIterators(sv_frame_t frame,
                           PointListIterator &startItr,
                           PointListIterator &endItr);
    void getPointIterators(sv_frame_t frame,
                           PointListConstIterator &startItr,
                           PointListConstIterator &endItr) const;

    // This is only used if the model is called on to act in
    // TabularModel mode
    mutable std::vector<sv_frame_t> m_rows; // map from row number to frame

    void rebuildRowVector() const
    {
        m_rows.clear();
        for (PointListConstIterator i = m_points.begin(); i != m_points.end(); ++i) {
//            std::cerr << "rebuildRowVector: row " << m_rows.size() << " -> " << i->frame << std::endl;
            m_rows.push_back(i->frame);
        }
    }

    PointListIterator getPointListIteratorForRow(int row)
    {
        if (m_rows.empty()) rebuildRowVector();
        if (row < 0 || row + 1 > int(m_rows.size())) return m_points.end();

        sv_frame_t frame = m_rows[row];
        int indexAtFrame = 0;
        int ri = row;
        while (ri > 0 && m_rows[ri-1] == m_rows[row]) { --ri; ++indexAtFrame; }
        int initialIndexAtFrame = indexAtFrame;

        PointListIterator i0, i1;
        getPointIterators(frame, i0, i1);
        PointListIterator i = i0;

        for (i = i0; i != i1; ++i) {
            if (i->frame < (int)frame) { continue; }
            if (indexAtFrame > 0) { --indexAtFrame; continue; }
            return i;
        }

        if (indexAtFrame > 0) {
            std::cerr << "WARNING: SparseModel::getPointListIteratorForRow: No iterator available for row " << row << " (frame = " << frame << ", index at frame = " << initialIndexAtFrame << ", leftover index " << indexAtFrame << ")" << std::endl;
        }
        return i;
    }

    PointListConstIterator getPointListIteratorForRow(int row) const
    {
        if (m_rows.empty()) rebuildRowVector();
        if (row < 0 || row + 1 > int(m_rows.size())) return m_points.end();

        sv_frame_t frame = m_rows[row];
        int indexAtFrame = 0;
        int ri = row;
        while (ri > 0 && m_rows[ri-1] == m_rows[row]) { --ri; ++indexAtFrame; }
        int initialIndexAtFrame = indexAtFrame;

//        std::cerr << "getPointListIteratorForRow " << row << ": initialIndexAtFrame = " << initialIndexAtFrame << " for frame " << frame << std::endl;

        PointListConstIterator i0, i1;
        getPointIterators(frame, i0, i1);
        PointListConstIterator i = i0;

        for (i = i0; i != i1; ++i) {
//            std::cerr << "i->frame is " << i->frame << ", wanting " << frame << std::endl;

            if (i->frame < (int)frame) { continue; }
            if (indexAtFrame > 0) { --indexAtFrame; continue; }
            return i;
        }
/*
        if (i == m_points.end()) {
            std::cerr << "returning i at end" << std::endl;
        } else {
            std::cerr << "returning i with i->frame = " << i->frame << std::endl;
        }
*/
        if (indexAtFrame > 0) {
            std::cerr << "WARNING: SparseModel::getPointListIteratorForRow: No iterator available for row " << row << " (frame = " << frame << ", index at frame = " << initialIndexAtFrame << ", leftover index " << indexAtFrame << ")" << std::endl;
        }
        return i;
    }

    QString toDelimitedDataStringSubsetFilled(QString delimiter,
                                              DataExportOptions opts,
                                              sv_frame_t f0,
                                              sv_frame_t f1) const {

        QString s;
        opts &= ~DataExportFillGaps;

        // find frame time of first point in range (if any)
        sv_frame_t first = f0;
        for (auto &p: m_points) {
            if (p.frame >= f0) {
                first = p.frame;
                break;
            }
        }

        // project back to first frame time in range according to
        // resolution.  e.g. if f0 = 2, first = 9, resolution = 4 then
        // we start at 5 (because 1 is too early and we need to arrive
        // at 9 to match the first actual point). This method is
        // stupid but easy to understand:
        sv_frame_t f = first;
        while (f >= f0 + m_resolution) f -= m_resolution;
        
        // now progress, either writing the next point (if within
        // distance) or a default point
        PointListConstIterator itr = m_points.begin();

        while (f < f1) {
            if (itr != m_points.end() && itr->frame <= f) {
                s += itr->toDelimitedDataString(delimiter, opts, m_sampleRate);
                ++itr;
            } else {
                s += Point(f).toDelimitedDataString(delimiter, opts, m_sampleRate);
            }
            s += "\n";
            f += m_resolution;
        }

        return s;
    }
};


template <typename PointType>
SparseModel<PointType>::SparseModel(sv_samplerate_t sampleRate,
                                    int resolution,
                                    bool notifyOnAdd) :
    m_sampleRate(sampleRate),
    m_resolution(resolution),
    m_notifyOnAdd(notifyOnAdd),
    m_sinceLastNotifyMin(-1),
    m_sinceLastNotifyMax(-1),
    m_hasTextLabels(false),
    m_pointCount(0),
    m_completion(100)
{
}

template <typename PointType>
sv_frame_t
SparseModel<PointType>::getStartFrame() const
{
    QMutexLocker locker(&m_mutex);
    sv_frame_t f = 0;
    if (!m_points.empty()) {
        f = m_points.begin()->frame;
    }
    return f;
}

template <typename PointType>
sv_frame_t
SparseModel<PointType>::getEndFrame() const
{
    QMutexLocker locker(&m_mutex);
    sv_frame_t f = 0;
    if (!m_points.empty()) {
        PointListConstIterator i(m_points.end());
        f = (--i)->frame + 1;
    }
    return f;
}

template <typename PointType>
bool
SparseModel<PointType>::isEmpty() const
{
    return m_pointCount == 0;
}

template <typename PointType>
int
SparseModel<PointType>::getPointCount() const
{
    return m_pointCount;
}

template <typename PointType>
const typename SparseModel<PointType>::PointList &
SparseModel<PointType>::getPoints() const
{
    return m_points;
}

template <typename PointType>
typename SparseModel<PointType>::PointList
SparseModel<PointType>::getPoints(sv_frame_t start, sv_frame_t end) const
{
    if (start > end) return PointList();
    QMutexLocker locker(&m_mutex);

    PointType startPoint(start), endPoint(end);
    
    PointListConstIterator startItr = m_points.lower_bound(startPoint);
    PointListConstIterator   endItr = m_points.upper_bound(endPoint);

    if (startItr != m_points.begin()) --startItr;
    if (startItr != m_points.begin()) --startItr;
    if (endItr != m_points.end()) ++endItr;
    if (endItr != m_points.end()) ++endItr;

    PointList rv;

    for (PointListConstIterator i = startItr; i != endItr; ++i) {
        rv.insert(*i);
    }

    return rv;
}

template <typename PointType>
typename SparseModel<PointType>::PointList
SparseModel<PointType>::getPoints(sv_frame_t frame) const
{
    PointListConstIterator startItr, endItr;
    getPointIterators(frame, startItr, endItr);

    PointList rv;

    for (PointListConstIterator i = startItr; i != endItr; ++i) {
        rv.insert(*i);
    }

    return rv;
}

template <typename PointType>
void
SparseModel<PointType>::getPointIterators(sv_frame_t frame,
                                          PointListIterator &startItr,
                                          PointListIterator &endItr)
{
    QMutexLocker locker(&m_mutex);

    if (m_resolution == 0) {
        startItr = m_points.end();
        endItr = m_points.end();
        return;
    }

    sv_frame_t start = (frame / m_resolution) * m_resolution;
    sv_frame_t end = start + m_resolution;

    PointType startPoint(start), endPoint(end);

    startItr = m_points.lower_bound(startPoint);
      endItr = m_points.upper_bound(endPoint);
}

template <typename PointType>
void
SparseModel<PointType>::getPointIterators(sv_frame_t frame,
                                          PointListConstIterator &startItr,
                                          PointListConstIterator &endItr) const
{
    QMutexLocker locker(&m_mutex);

    if (m_resolution == 0) {
//        std::cerr << "getPointIterators: resolution == 0, returning end()" << std::endl;
        startItr = m_points.end();
        endItr = m_points.end();
        return;
    }

    sv_frame_t start = (frame / m_resolution) * m_resolution;
    sv_frame_t end = start + m_resolution;

    PointType startPoint(start), endPoint(end);
    
//    std::cerr << "getPointIterators: start frame " << start << ", end frame " << end << ", m_resolution " << m_resolution << std::endl;

    startItr = m_points.lower_bound(startPoint);
      endItr = m_points.upper_bound(endPoint);
}

template <typename PointType>
typename SparseModel<PointType>::PointList
SparseModel<PointType>::getPreviousPoints(sv_frame_t originFrame) const
{
    QMutexLocker locker(&m_mutex);

    PointType lookupPoint(originFrame);
    PointList rv;

    PointListConstIterator i = m_points.lower_bound(lookupPoint);
    if (i == m_points.begin()) return rv;

    --i;
    sv_frame_t frame = i->frame;
    while (i->frame == frame) {
        rv.insert(*i);
        if (i == m_points.begin()) break;
        --i;
    }

    return rv;
}
 
template <typename PointType>
typename SparseModel<PointType>::PointList
SparseModel<PointType>::getNextPoints(sv_frame_t originFrame) const
{
    QMutexLocker locker(&m_mutex);

    PointType lookupPoint(originFrame);
    PointList rv;

    PointListConstIterator i = m_points.upper_bound(lookupPoint);
    if (i == m_points.end()) return rv;

    sv_frame_t frame = i->frame;
    while (i != m_points.end() && i->frame == frame) {
        rv.insert(*i);
        ++i;
    }

    return rv;
}

template <typename PointType>
void
SparseModel<PointType>::setResolution(int resolution)
{
    {
        QMutexLocker locker(&m_mutex);
        m_resolution = resolution;
        m_rows.clear();
    }
    emit modelChanged();
}

template <typename PointType>
void
SparseModel<PointType>::clear()
{
    {
        QMutexLocker locker(&m_mutex);
        m_points.clear();
        m_pointCount = 0;
        m_rows.clear();
    }
    emit modelChanged();
}

template <typename PointType>
void
SparseModel<PointType>::addPoint(const PointType &point)
{
    QMutexLocker locker(&m_mutex);

    m_points.insert(point);
    m_pointCount++;
    if (point.getLabel() != "") m_hasTextLabels = true;

    // Even though this model is nominally sparse, there may still be
    // too many signals going on here (especially as they'll probably
    // be queued from one thread to another), which is why we need the
    // notifyOnAdd as an option rather than a necessity (the
    // alternative is to notify on setCompletion).

    if (m_notifyOnAdd) {
        m_rows.clear(); //!!! inefficient
        emit modelChangedWithin(point.frame, point.frame + m_resolution);
    } else {
        if (m_sinceLastNotifyMin == -1 ||
            point.frame < m_sinceLastNotifyMin) {
            m_sinceLastNotifyMin = point.frame;
        }
        if (m_sinceLastNotifyMax == -1 ||
            point.frame > m_sinceLastNotifyMax) {
            m_sinceLastNotifyMax = point.frame;
        }
    }
}

template <typename PointType>
bool
SparseModel<PointType>::containsPoint(const PointType &point)
{
    QMutexLocker locker(&m_mutex);

    PointListIterator i = m_points.lower_bound(point);
    typename PointType::Comparator comparator;
    while (i != m_points.end()) {
        if (i->frame > point.frame) break;
        if (!comparator(*i, point) && !comparator(point, *i)) {
            return true;
        }
        ++i;
    }

    return false;
}

template <typename PointType>
void
SparseModel<PointType>::deletePoint(const PointType &point)
{
    QMutexLocker locker(&m_mutex);

    PointListIterator i = m_points.lower_bound(point);
    typename PointType::Comparator comparator;
    while (i != m_points.end()) {
        if (i->frame > point.frame) break;
        if (!comparator(*i, point) && !comparator(point, *i)) {
            m_points.erase(i);
            m_pointCount--;
            break;
            }
        ++i;
    }

//    std::cout << "SparseOneDimensionalModel: emit modelChanged("
//              << point.frame << ")" << std::endl;
    m_rows.clear(); //!!! inefficient
    emit modelChangedWithin(point.frame, point.frame + m_resolution);
}

template <typename PointType>
void
SparseModel<PointType>::setCompletion(int completion, bool update)
{
//    std::cerr << "SparseModel::setCompletion(" << completion << ")" << std::endl;

    QMutexLocker locker(&m_mutex);

    if (m_completion != completion) {
        m_completion = completion;

        if (completion == 100) {

            if (!m_notifyOnAdd) {
                emit completionChanged();
            }

            m_notifyOnAdd = true; // henceforth
            m_rows.clear(); //!!! inefficient
            emit modelChanged();

        } else if (!m_notifyOnAdd) {

            if (update &&
                m_sinceLastNotifyMin >= 0 &&
                m_sinceLastNotifyMax >= 0) {
                m_rows.clear(); //!!! inefficient
                emit modelChangedWithin(m_sinceLastNotifyMin, m_sinceLastNotifyMax);
                m_sinceLastNotifyMin = m_sinceLastNotifyMax = -1;
            } else {
                emit completionChanged();
            }
        } else {
            emit completionChanged();
        }            
    }
}

template <typename PointType>
void
SparseModel<PointType>::toXml(QTextStream &out,
                              QString indent,
                              QString extraAttributes) const
{
//    std::cerr << "SparseModel::toXml: extraAttributes = \"" 
//              << extraAttributes.toStdString() << std::endl;

    QString type = getXmlOutputType();

    Model::toXml
        (out,
         indent,
         QString("type=\"%1\" dimensions=\"%2\" resolution=\"%3\" notifyOnAdd=\"%4\" dataset=\"%5\" %6")
         .arg(type)
         .arg(PointType(0).getDimensions())
         .arg(m_resolution)
         .arg(m_notifyOnAdd ? "true" : "false")
         .arg(getObjectExportId(&m_points))
         .arg(extraAttributes));

    out << indent;
    out << QString("<dataset id=\"%1\" dimensions=\"%2\">\n")
        .arg(getObjectExportId(&m_points))
        .arg(PointType(0).getDimensions());

    for (PointListConstIterator i = m_points.begin(); i != m_points.end(); ++i) {
        i->toXml(out, indent + "  ");
    }

    out << indent;
    out << "</dataset>\n";
}

template <typename PointType>
SparseModel<PointType>::EditCommand::EditCommand(SparseModel *model,
                                                 QString commandName) :
    MacroCommand(commandName),
    m_model(model)
{
}

template <typename PointType>
void
SparseModel<PointType>::EditCommand::addPoint(const PointType &point)
{
    addCommand(new AddPointCommand(m_model, point), true);
}

template <typename PointType>
void
SparseModel<PointType>::EditCommand::deletePoint(const PointType &point)
{
    addCommand(new DeletePointCommand(m_model, point), true);
}

template <typename PointType>
typename SparseModel<PointType>::EditCommand *
SparseModel<PointType>::EditCommand::finish()
{
    if (!m_commands.empty()) {
        return this;
    } else {
        delete this;
        return 0;
    }
}

template <typename PointType>
void
SparseModel<PointType>::EditCommand::addCommand(Command *command,
                                                bool executeFirst)
{
    if (executeFirst) command->execute();

    if (!m_commands.empty()) {
        DeletePointCommand *dpc = dynamic_cast<DeletePointCommand *>(command);
        if (dpc) {
            AddPointCommand *apc = dynamic_cast<AddPointCommand *>
                (m_commands[m_commands.size() - 1]);
            typename PointType::Comparator comparator;
            if (apc) {
                if (!comparator(apc->getPoint(), dpc->getPoint()) &&
                    !comparator(dpc->getPoint(), apc->getPoint())) {
                    deleteCommand(apc);
                    return;
                }
            }
        }
    }

    MacroCommand::addCommand(command);
}


#endif