view framework/Document.cpp @ 636:e2715204feaa fix-static-analysis

Use nullptr throughout

/* -*- 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 and QMUL.
    
    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.
*/

#include "Document.h"

#include "Align.h"

#include "data/model/WaveFileModel.h"
#include "data/model/WritableWaveFileModel.h"
#include "data/model/DenseThreeDimensionalModel.h"
#include "data/model/DenseTimeValueModel.h"
#include "data/model/FlexiNoteModel.h"
#include "data/model/AggregateWaveModel.h"

#include "layer/Layer.h"
#include "widgets/CommandHistory.h"
#include "base/Command.h"
#include "view/View.h"
#include "base/PlayParameterRepository.h"
#include "base/PlayParameters.h"
#include "transform/TransformFactory.h"
#include "transform/ModelTransformerFactory.h"
#include "transform/FeatureExtractionModelTransformer.h"
#include <QApplication>
#include <QTextStream>
#include <QSettings>
#include <iostream>
#include <typeinfo>

#include "data/model/AlignmentModel.h"
#include "Align.h"

using std::vector;

//#define DEBUG_DOCUMENT 1

//!!! still need to handle command history, documentRestored/documentModified

Document::Document() :
    m_mainModel(nullptr),
    m_autoAlignment(false),
    m_align(new Align()),
    m_isIncomplete(false)
{
    connect(this,
            SIGNAL(modelAboutToBeDeleted(Model *)),
            ModelTransformerFactory::getInstance(),
            SLOT(modelAboutToBeDeleted(Model *)));

    connect(ModelTransformerFactory::getInstance(),
            SIGNAL(transformFailed(QString, QString)),
            this,
            SIGNAL(modelGenerationFailed(QString, QString)));

    connect(m_align, SIGNAL(alignmentComplete(AlignmentModel *)),
            this, SIGNAL(alignmentComplete(AlignmentModel *)));
}

Document::~Document()
{
    //!!! Document should really own the command history.  atm we
    //still refer to it in various places that don't have access to
    //the document, be nice to fix that

#ifdef DEBUG_DOCUMENT
    cerr << "\n\nDocument::~Document: about to clear command history" << endl;
#endif
    CommandHistory::getInstance()->clear();
    
#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::~Document: about to delete layers" << endl;
#endif
    while (!m_layers.empty()) {
        deleteLayer(*m_layers.begin(), true);
    }

    if (!m_models.empty()) {
        SVDEBUG << "Document::~Document: WARNING: " 
                  << m_models.size() << " model(s) still remain -- "
                  << "should have been garbage collected when deleting layers"
                  << endl;
        while (!m_models.empty()) {
            Model *model = m_models.begin()->first;
            if (model == m_mainModel) {
                // just in case!
                SVDEBUG << "Document::~Document: WARNING: Main model is also"
                          << " in models list!" << endl;
            } else if (model) {
                model->aboutToDelete();
                emit modelAboutToBeDeleted(model);
                delete model;
            }
            m_models.erase(m_models.begin());
        }
    }

#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::~Document: About to get rid of main model"
              << endl;
#endif
    if (m_mainModel) {
        m_mainModel->aboutToDelete();
        emit modelAboutToBeDeleted(m_mainModel);
    }

    emit mainModelChanged(nullptr);
    delete m_mainModel;
}

Layer *
Document::createLayer(LayerFactory::LayerType type)
{
    Layer *newLayer = LayerFactory::getInstance()->createLayer(type);
    if (!newLayer) return nullptr;

    newLayer->setObjectName(getUniqueLayerName(newLayer->objectName()));

    m_layers.insert(newLayer);

#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::createLayer: Added layer of type " << type
              << ", now have " << m_layers.size() << " layers" << endl;
#endif

    emit layerAdded(newLayer);

    return newLayer;
}

Layer *
Document::createMainModelLayer(LayerFactory::LayerType type)
{
    Layer *newLayer = createLayer(type);
    if (!newLayer) return nullptr;
    setModel(newLayer, m_mainModel);
    return newLayer;
}

Layer *
Document::createImportedLayer(Model *model)
{
    LayerFactory::LayerTypeSet types =
        LayerFactory::getInstance()->getValidLayerTypes(model);

    if (types.empty()) {
        cerr << "WARNING: Document::importLayer: no valid display layer for model" << endl;
        return nullptr;
    }

    //!!! for now, just use the first suitable layer type
    LayerFactory::LayerType type = *types.begin();

    Layer *newLayer = LayerFactory::getInstance()->createLayer(type);
    if (!newLayer) return nullptr;

    newLayer->setObjectName(getUniqueLayerName(newLayer->objectName()));

    addImportedModel(model);
    setModel(newLayer, model);

    //!!! and all channels
    setChannel(newLayer, -1);

    m_layers.insert(newLayer);

#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::createImportedLayer: Added layer of type " << type
              << ", now have " << m_layers.size() << " layers" << endl;
#endif

    emit layerAdded(newLayer);
    return newLayer;
}

Layer *
Document::createEmptyLayer(LayerFactory::LayerType type)
{
    if (!m_mainModel) return nullptr;

    Model *newModel =
        LayerFactory::getInstance()->createEmptyModel(type, m_mainModel);
    if (!newModel) return nullptr;

    Layer *newLayer = createLayer(type);
    if (!newLayer) {
        delete newModel;
        return nullptr;
    }

    addImportedModel(newModel);
    setModel(newLayer, newModel);

    return newLayer;
}

Layer *
Document::createDerivedLayer(LayerFactory::LayerType type,
                             TransformId transform)
{
    Layer *newLayer = createLayer(type);
    if (!newLayer) return nullptr;

    newLayer->setObjectName(getUniqueLayerName
                            (TransformFactory::getInstance()->
                             getTransformFriendlyName(transform)));

    return newLayer;
}

Layer *
Document::createDerivedLayer(const Transform &transform,
                             const ModelTransformer::Input &input)
{
    Transforms transforms;
    transforms.push_back(transform);
    vector<Layer *> layers = createDerivedLayers(transforms, input);
    if (layers.empty()) return nullptr;
    else return layers[0];
}

vector<Layer *>
Document::createDerivedLayers(const Transforms &transforms,
                              const ModelTransformer::Input &input)
{
    QString message;
    vector<Model *> newModels = addDerivedModels(transforms, input, message, nullptr);

    if (newModels.empty()) {
        //!!! This identifier may be wrong!
        emit modelGenerationFailed(transforms[0].getIdentifier(), message);
        return vector<Layer *>();
    } else if (message != "") {
        //!!! This identifier may be wrong!
        emit modelGenerationWarning(transforms[0].getIdentifier(), message);
    }

    QStringList names;
    for (int i = 0; i < (int)newModels.size(); ++i) {
        names.push_back(getUniqueLayerName
                        (TransformFactory::getInstance()->
                         getTransformFriendlyName
                         (transforms[i].getIdentifier())));
    }

    vector<Layer *> layers = createLayersForDerivedModels(newModels, names);
    return layers;
}

class AdditionalModelConverter : 
    public ModelTransformerFactory::AdditionalModelHandler
{
public:
    AdditionalModelConverter(Document *doc, 
                             Document::LayerCreationHandler *handler) :
        m_doc(doc),
        m_handler(handler) {
    }

    ~AdditionalModelConverter() override { }

    void
    setPrimaryLayers(vector<Layer *> layers) {
        m_primary = layers;
    }

    void
    moreModelsAvailable(vector<Model *> models) override {
        std::cerr << "AdditionalModelConverter::moreModelsAvailable: " << models.size() << " model(s)" << std::endl;
        // We can't automatically regenerate the additional models on
        // reload -- we should delete them instead
        QStringList names;
        foreach (Model *model, models) {
            m_doc->addAdditionalModel(model);
            names.push_back(QString());
        }
        vector<Layer *> layers = m_doc->createLayersForDerivedModels
            (models, names);
        m_handler->layersCreated(this, m_primary, layers);
        delete this;
    }

    void
    noMoreModelsAvailable() override {
        std::cerr << "AdditionalModelConverter::noMoreModelsAvailable" << std::endl;
        m_handler->layersCreated(this, m_primary, vector<Layer *>());
        delete this;
    }

    void cancel() {
        foreach (Layer *layer, m_primary) {
            Model *model = layer->getModel();
            if (model) {
                model->abandon();
            }
        }
    }

private:
    Document *m_doc;
    vector<Layer *> m_primary;
    Document::LayerCreationHandler *m_handler; //!!! how to handle destruction of this?
};

Document::LayerCreationAsyncHandle
Document::createDerivedLayersAsync(const Transforms &transforms,
                                   const ModelTransformer::Input &input,
                                   LayerCreationHandler *handler)
{
    QString message;

    AdditionalModelConverter *amc = new AdditionalModelConverter(this, handler);
    
    vector<Model *> newModels = addDerivedModels
        (transforms, input, message, amc);

    QStringList names;
    for (int i = 0; i < (int)newModels.size(); ++i) {
        names.push_back(getUniqueLayerName
                        (TransformFactory::getInstance()->
                         getTransformFriendlyName
                         (transforms[i].getIdentifier())));
    }

    vector<Layer *> layers = createLayersForDerivedModels(newModels, names);
    amc->setPrimaryLayers(layers);

    if (newModels.empty()) {
        //!!! This identifier may be wrong!
        emit modelGenerationFailed(transforms[0].getIdentifier(), message);
        //!!! what to do with amc?
    } else if (message != "") {
        //!!! This identifier may be wrong!
        emit modelGenerationWarning(transforms[0].getIdentifier(), message);
        //!!! what to do with amc?
    }

    return amc;
}

void
Document::cancelAsyncLayerCreation(Document::LayerCreationAsyncHandle h)
{
    AdditionalModelConverter *conv = static_cast<AdditionalModelConverter *>(h);
    conv->cancel();
}

vector<Layer *>
Document::createLayersForDerivedModels(vector<Model *> newModels, 
                                       QStringList names)
{
    vector<Layer *> layers;
    
    for (int i = 0; i < (int)newModels.size(); ++i) {

        Model *newModel = newModels[i];

        LayerFactory::LayerTypeSet types =
            LayerFactory::getInstance()->getValidLayerTypes(newModel);

        if (types.empty()) {
            cerr << "WARNING: Document::createLayerForTransformer: no valid display layer for output of transform " << names[i] << endl;
            //!!! inadequate cleanup:
            newModel->aboutToDelete();
            emit modelAboutToBeDeleted(newModel);
            m_models.erase(newModel);
            delete newModel;
            return vector<Layer *>();
        }

        //!!! for now, just use the first suitable layer type

        Layer *newLayer = createLayer(*types.begin());
        setModel(newLayer, newModel);

        //!!! We need to clone the model when adding the layer, so that it
        //can be edited without affecting other layers that are based on
        //the same model.  Unfortunately we can't just clone it now,
        //because it probably hasn't been completed yet -- the transform
        //runs in the background.  Maybe the transform has to handle
        //cloning and cacheing models itself.
        //
        // Once we do clone models here, of course, we'll have to avoid
        // leaking them too.
        //
        // We want the user to be able to add a model to a second layer
        // _while it's still being calculated in the first_ and have it
        // work quickly.  That means we need to put the same physical
        // model pointer in both layers, so they can't actually be cloned.
    
        if (newLayer) {
            newLayer->setObjectName(names[i]);
        }

        emit layerAdded(newLayer);
        layers.push_back(newLayer);
    }

    return layers;
}

void
Document::setMainModel(WaveFileModel *model)
{
    Model *oldMainModel = m_mainModel;
    m_mainModel = model;
    
    emit modelAdded(m_mainModel);
    if (model) {
        emit activity(tr("Set main model to %1").arg(model->objectName()));
    } else {
        emit activity(tr("Clear main model"));
    }

    std::vector<Layer *> obsoleteLayers;
    std::set<QString> failedTransformers;

    // We need to ensure that no layer is left using oldMainModel or
    // any of the old derived models as its model.  Either replace the
    // model, or delete the layer for each layer that is currently
    // using one of these.  Carry out this replacement before we
    // delete any of the models.

#ifdef DEBUG_DOCUMENT
    cerr << "Document::setMainModel: Have "
              << m_layers.size() << " layers" << endl;
    cerr << "Models now: ";
    for (ModelMap::const_iterator i = m_models.begin(); i != m_models.end(); ++i) {
        cerr << i->first << " ";
    } 
    cerr << endl;
    cerr << "Old main model: " << oldMainModel << endl;
#endif

    for (LayerSet::iterator i = m_layers.begin(); i != m_layers.end(); ++i) {

        Layer *layer = *i;
        Model *model = layer->getModel();

#ifdef DEBUG_DOCUMENT
        cerr << "Document::setMainModel: inspecting model "
                  << (model ? model->objectName(): "(null)") << " in layer "
                  << layer->objectName() << endl;
#endif

        if (model == oldMainModel) {
#ifdef DEBUG_DOCUMENT
            cerr << "... it uses the old main model, replacing" << endl;
#endif
            LayerFactory::getInstance()->setModel(layer, m_mainModel);
            continue;
        }

        if (!model) {
            cerr << "WARNING: Document::setMainModel: Null model in layer "
                      << layer << endl;
            // get rid of this hideous degenerate
            obsoleteLayers.push_back(layer);
            continue;
        }

        if (m_models.find(model) == m_models.end()) {
            cerr << "WARNING: Document::setMainModel: Unknown model "
                      << model << " in layer " << layer << endl;
            // and this one
            obsoleteLayers.push_back(layer);
            continue;
        }
            
        if (m_models[model].source &&
            (m_models[model].source == oldMainModel)) {

#ifdef DEBUG_DOCUMENT
            cerr << "... it uses a model derived from the old main model, regenerating" << endl;
#endif

            // This model was derived from the previous main
            // model: regenerate it.
            
            const Transform &transform = m_models[model].transform;
            QString transformId = transform.getIdentifier();
            
            //!!! We have a problem here if the number of channels in
            //the main model has changed.

            QString message;
            Model *replacementModel =
                addDerivedModel(transform,
                                ModelTransformer::Input
                                (m_mainModel, m_models[model].channel),
                                message);
            
            if (!replacementModel) {
                cerr << "WARNING: Document::setMainModel: Failed to regenerate model for transform \""
                          << transformId << "\"" << " in layer " << layer << endl;
                if (failedTransformers.find(transformId)
                    == failedTransformers.end()) {
                    emit modelRegenerationFailed(layer->objectName(),
                                                 transformId,
                                                 message);
                    failedTransformers.insert(transformId);
                }
                obsoleteLayers.push_back(layer);
            } else {
                if (message != "") {
                    emit modelRegenerationWarning(layer->objectName(),
                                                  transformId,
                                                  message);
                }
#ifdef DEBUG_DOCUMENT
                cerr << "Replacing model " << model << " (type "
                          << typeid(*model).name() << ") with model "
                          << replacementModel << " (type "
                          << typeid(*replacementModel).name() << ") in layer "
                          << layer << " (name " << layer->objectName() << ")"
                          << endl;

                RangeSummarisableTimeValueModel *rm =
                    dynamic_cast<RangeSummarisableTimeValueModel *>(replacementModel);
                if (rm) {
                    cerr << "new model has " << rm->getChannelCount() << " channels " << endl;
                } else {
                    cerr << "new model " << replacementModel << " is not a RangeSummarisableTimeValueModel!" << endl;
                }
#endif
                setModel(layer, replacementModel);
            }
        }            
    }

    for (size_t k = 0; k < obsoleteLayers.size(); ++k) {
        deleteLayer(obsoleteLayers[k], true);
    }

    for (ModelMap::iterator i = m_models.begin(); i != m_models.end(); ++i) {
        if (i->second.additional) {
            Model *m = i->first;
            m->aboutToDelete();
            emit modelAboutToBeDeleted(m);
            delete m;
        }
    }

    for (ModelMap::iterator i = m_models.begin(); i != m_models.end(); ++i) {

        Model *m = i->first;

#ifdef DEBUG_DOCUMENT
        SVDEBUG << "considering alignment for model " << m << " (name \""
                  << m->objectName() << "\")" << endl;
#endif

        if (m_autoAlignment) {

            alignModel(m);

        } else if (oldMainModel &&
                   (m->getAlignmentReference() == oldMainModel)) {

            alignModel(m);
        }
    }

    if (oldMainModel) {
        oldMainModel->aboutToDelete();
        emit modelAboutToBeDeleted(oldMainModel);
    }

    if (m_autoAlignment) {
        SVDEBUG << "Document::setMainModel: auto-alignment is on, aligning model if possible" << endl;
        alignModel(m_mainModel);
    }

    emit mainModelChanged(m_mainModel);

    delete oldMainModel;
}

void
Document::addAlreadyDerivedModel(const Transform &transform,
                                 const ModelTransformer::Input &input,
                                 Model *outputModelToAdd)
{
    if (m_models.find(outputModelToAdd) != m_models.end()) {
        cerr << "WARNING: Document::addAlreadyDerivedModel: Model already added"
                  << endl;
        return;
    }

#ifdef DEBUG_DOCUMENT
    if (input.getModel()) {
        cerr << "Document::addAlreadyDerivedModel: source is " << input.getModel() << " \"" << input.getModel()->objectName() << "\"" << endl;
    } else {
        cerr << "Document::addAlreadyDerivedModel: source is " << input.getModel() << endl;
    }
#endif

    ModelRecord rec;
    rec.source = input.getModel();
    rec.channel = input.getChannel();
    rec.transform = transform;
    rec.additional = false;
    rec.refcount = 0;

    outputModelToAdd->setSourceModel(input.getModel());

    m_models[outputModelToAdd] = rec;

#ifdef DEBUG_DOCUMENT
    cerr << "Document::addAlreadyDerivedModel: Added model " << outputModelToAdd << endl;
    cerr << "Models now: ";
    for (ModelMap::const_iterator i = m_models.begin(); i != m_models.end(); ++i) {
        cerr << i->first << " ";
    } 
    cerr << endl;
#endif

    emit modelAdded(outputModelToAdd);
}


void
Document::addImportedModel(Model *model)
{
    if (m_models.find(model) != m_models.end()) {
        cerr << "WARNING: Document::addImportedModel: Model already added"
                  << endl;
        return;
    }

    ModelRecord rec;
    rec.source = nullptr;
    rec.channel = 0;
    rec.refcount = 0;
    rec.additional = false;

    m_models[model] = rec;

#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::addImportedModel: Added model " << model << endl;
    cerr << "Models now: ";
    for (ModelMap::const_iterator i = m_models.begin(); i != m_models.end(); ++i) {
        cerr << i->first << " ";
    } 
    cerr << endl;
#endif

    if (m_autoAlignment) {
        SVDEBUG << "Document::addImportedModel: auto-alignment is on, aligning model if possible" << endl;
        alignModel(model);
    } else {
        SVDEBUG << "Document(" << this << "): addImportedModel: auto-alignment is off" << endl;
    }

    emit modelAdded(model);
}

void
Document::addAdditionalModel(Model *model)
{
    if (m_models.find(model) != m_models.end()) {
        cerr << "WARNING: Document::addAdditionalModel: Model already added"
                  << endl;
        return;
    }

    ModelRecord rec;
    rec.source = nullptr;
    rec.channel = 0;
    rec.refcount = 0;
    rec.additional = true;

    m_models[model] = rec;

#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::addAdditionalModel: Added model " << model << endl;
    cerr << "Models now: ";
    for (ModelMap::const_iterator i = m_models.begin(); i != m_models.end(); ++i) {
        cerr << i->first << " ";
    } 
    cerr << endl;
#endif

    if (m_autoAlignment) {
        SVDEBUG << "Document::addAdditionalModel: auto-alignment is on, aligning model if possible" << endl;
        alignModel(model);
    }

    emit modelAdded(model);
}

void
Document::addAggregateModel(AggregateWaveModel *model)
{
    connect(model, SIGNAL(modelInvalidated()),
            this, SLOT(aggregateModelInvalidated()));
    m_aggregateModels.insert(model);
}

void
Document::aggregateModelInvalidated()
{
    QObject *s = sender();
    AggregateWaveModel *aggregate = qobject_cast<AggregateWaveModel *>(s);
    if (aggregate) releaseModel(aggregate);
}

Model *
Document::addDerivedModel(const Transform &transform,
                          const ModelTransformer::Input &input,
                          QString &message)
{
    for (ModelMap::iterator i = m_models.begin(); i != m_models.end(); ++i) {
        if (i->second.transform == transform &&
            i->second.source == input.getModel() && 
            i->second.channel == input.getChannel()) {
            std::cerr << "derived model taken from map " << std::endl;
            return i->first;
        }
    }

    Transforms tt;
    tt.push_back(transform);
    vector<Model *> mm = addDerivedModels(tt, input, message, nullptr);
    if (mm.empty()) return nullptr;
    else return mm[0];
}

vector<Model *>
Document::addDerivedModels(const Transforms &transforms,
                           const ModelTransformer::Input &input,
                           QString &message,
                           AdditionalModelConverter *amc)
{
    vector<Model *> mm = 
        ModelTransformerFactory::getInstance()->transformMultiple
        (transforms, input, message, amc);

    for (int j = 0; j < (int)mm.size(); ++j) {

        Model *model = mm[j];

        // The transform we actually used was presumably identical to
        // the one asked for, except that the version of the plugin
        // may differ.  It's possible that the returned message
        // contains a warning about this; that doesn't concern us
        // here, but we do need to ensure that the transform we
        // remember is correct for what was actually applied, with the
        // current plugin version.

        //!!! would be nice to short-circuit this -- the version is
        //!!! static data, shouldn't have to construct a plugin for it
        //!!! (which may be expensive in Piper-world)
        
        Transform applied = transforms[j];
        applied.setPluginVersion
            (TransformFactory::getInstance()->
             getDefaultTransformFor(applied.getIdentifier(),
                                    applied.getSampleRate())
             .getPluginVersion());

        if (!model) {
            cerr << "WARNING: Document::addDerivedModel: no output model for transform " << applied.getIdentifier() << endl;
        } else {
            addAlreadyDerivedModel(applied, input, model);
        }
    }
        
    return mm;
}

void
Document::releaseModel(Model *model) // Will _not_ release main model!
{
    if (model == nullptr) {
        return;
    }

    if (model == m_mainModel) {
        return;
    }

    bool toDelete = false;

    if (m_models.find(model) != m_models.end()) {
        if (m_models[model].refcount == 0) {
            SVCERR << "WARNING: Document::releaseModel: model " << model
                   << " reference count is zero already!" << endl;
        } else {
            if (--m_models[model].refcount == 0) {
                toDelete = true;
            }
        }
    } else if (m_aggregateModels.find(model) != m_aggregateModels.end()) {
        SVDEBUG << "Document::releaseModel: is an aggregate model" << endl;
        toDelete = true;
    } else { 
        SVCERR << "WARNING: Document::releaseModel: Unfound model "
               << model << endl;
        toDelete = true;
    }

    if (toDelete) {

        int sourceCount = 0;

        for (ModelMap::iterator i = m_models.begin(); i != m_models.end(); ++i) {
            if (i->second.source == model) {
                ++sourceCount;
                i->second.source = nullptr;
            }
        }

        if (sourceCount > 0) {
            SVDEBUG << "Document::releaseModel: Deleting model "
                    << model << " even though it is source for "
                    << sourceCount << " other derived model(s) -- resetting "
                    << "their source fields appropriately" << endl;
        }

        model->aboutToDelete();
        emit modelAboutToBeDeleted(model);
        m_models.erase(model);

#ifdef DEBUG_DOCUMENT
        SVDEBUG << "Document::releaseModel: Deleted model " << model << endl;
        cerr << "Models now: ";
        for (ModelMap::const_iterator i = m_models.begin(); i != m_models.end(); ++i) {
            cerr << i->first << " ";
        } 
        cerr << endl;
#endif

        delete model;
    }
}

void
Document::deleteLayer(Layer *layer, bool force)
{
    if (m_layerViewMap.find(layer) != m_layerViewMap.end() &&
        m_layerViewMap[layer].size() > 0) {

        cerr << "WARNING: Document::deleteLayer: Layer "
                  << layer << " [" << layer->objectName() << "]"
                  << " is still used in " << m_layerViewMap[layer].size()
                  << " views!" << endl;

        if (force) {

#ifdef DEBUG_DOCUMENT
            cerr << "(force flag set -- deleting from all views)" << endl;
#endif

            for (std::set<View *>::iterator j = m_layerViewMap[layer].begin();
                 j != m_layerViewMap[layer].end(); ++j) {
                // don't use removeLayerFromView, as it issues a command
                layer->setLayerDormant(*j, true);
                (*j)->removeLayer(layer);
            }
            
            m_layerViewMap.erase(layer);

        } else {
            return;
        }
    }

    if (m_layers.find(layer) == m_layers.end()) {
        SVDEBUG << "Document::deleteLayer: Layer "
                  << layer << " (" << typeid(layer).name() <<
                  ") does not exist, or has already been deleted "
                  << "(this may not be as serious as it sounds)" << endl;
        return;
    }

    m_layers.erase(layer);

#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::deleteLayer: Removing, now have "
              << m_layers.size() << " layers" << endl;
#endif

    releaseModel(layer->getModel());
    emit layerRemoved(layer);
    emit layerAboutToBeDeleted(layer);
    delete layer;
}

void
Document::setModel(Layer *layer, Model *model)
{
    if (model && 
        model != m_mainModel &&
        m_models.find(model) == m_models.end()) {
        cerr << "ERROR: Document::setModel: Layer " << layer
                  << " (\"" << layer->objectName()
                  << "\") wants to use unregistered model " << model
                  << ": register the layer's model before setting it!"
                  << endl;
        return;
    }

    Model *previousModel = layer->getModel();

    if (previousModel == model) {
        SVDEBUG << "NOTE: Document::setModel: Layer " << layer << " (\""
                  << layer->objectName()                  << "\") is already set to model "
                  << model << " (\""
                  << (model ? model->objectName(): "(null)")
                  << "\")" << endl;
        return;
    }

    if (model && model != m_mainModel) {
        m_models[model].refcount ++;
    }

    if (model && previousModel) {
        PlayParameterRepository::getInstance()->copyParameters
            (previousModel, model);
    }

    LayerFactory::getInstance()->setModel(layer, model);
        // std::cerr << "layer type: " << LayerFactory::getInstance()->getLayerTypeName(LayerFactory::getInstance()->getLayerType(layer)) << std::endl;

    if (previousModel) {
        releaseModel(previousModel);
    }
}

void
Document::setChannel(Layer *layer, int channel)
{
    LayerFactory::getInstance()->setChannel(layer, channel);
}

void
Document::addLayerToView(View *view, Layer *layer)
{
    Model *model = layer->getModel();
    if (!model) {
#ifdef DEBUG_DOCUMENT
        SVDEBUG << "Document::addLayerToView: Layer (\""
                  << layer->objectName()                  << "\") with no model being added to view: "
                  << "normally you want to set the model first" << endl;
#endif
    } else {
        if (model != m_mainModel &&
            m_models.find(model) == m_models.end()) {
            cerr << "ERROR: Document::addLayerToView: Layer " << layer
                      << " has unregistered model " << model
                      << " -- register the layer's model before adding the layer!" << endl;
            return;
        }
    }

    CommandHistory::getInstance()->addCommand
        (new Document::AddLayerCommand(this, view, layer));
}

void
Document::removeLayerFromView(View *view, Layer *layer)
{
    CommandHistory::getInstance()->addCommand
        (new Document::RemoveLayerCommand(this, view, layer));
}

void
Document::addToLayerViewMap(Layer *layer, View *view)
{
    bool firstView = (m_layerViewMap.find(layer) == m_layerViewMap.end() ||
                      m_layerViewMap[layer].empty());

    if (m_layerViewMap[layer].find(view) !=
        m_layerViewMap[layer].end()) {
        cerr << "WARNING: Document::addToLayerViewMap:"
                  << " Layer " << layer << " -> view " << view << " already in"
                  << " layer view map -- internal inconsistency" << endl;
    }

    m_layerViewMap[layer].insert(view);

    if (firstView) emit layerInAView(layer, true);
}
    
void
Document::removeFromLayerViewMap(Layer *layer, View *view)
{
    if (m_layerViewMap[layer].find(view) ==
        m_layerViewMap[layer].end()) {
        cerr << "WARNING: Document::removeFromLayerViewMap:"
                  << " Layer " << layer << " -> view " << view << " not in"
                  << " layer view map -- internal inconsistency" << endl;
    }

    m_layerViewMap[layer].erase(view);

    if (m_layerViewMap[layer].empty()) {
        m_layerViewMap.erase(layer);
        emit layerInAView(layer, false);
    }
}

QString
Document::getUniqueLayerName(QString candidate)
{
    for (int count = 1; ; ++count) {

        QString adjusted =
            (count > 1 ? QString("%1 <%2>").arg(candidate).arg(count) :
             candidate);
        
        bool duplicate = false;

        for (LayerSet::iterator i = m_layers.begin(); i != m_layers.end(); ++i) {
            if ((*i)->objectName() == adjusted) {
                duplicate = true;
                break;
            }
        }

        if (!duplicate) return adjusted;
    }
}

std::vector<Model *>
Document::getTransformInputModels()
{
    std::vector<Model *> models;

    if (!m_mainModel) return models;

    models.push_back(m_mainModel);

    //!!! This will pick up all models, including those that aren't visible...

    for (ModelMap::iterator i = m_models.begin(); i != m_models.end(); ++i) {

        Model *model = i->first;
        if (!model || model == m_mainModel) continue;
        DenseTimeValueModel *dtvm = dynamic_cast<DenseTimeValueModel *>(model);
        
        if (dtvm) {
            models.push_back(dtvm);
        }
    }

    return models;
}

bool
Document::isKnownModel(const Model *model) const
{
    if (model == m_mainModel) return true;
    return (m_models.find(const_cast<Model *>(model)) != m_models.end());
}

bool
Document::canAlign()
{
    return Align::canAlign();
}

void
Document::alignModel(Model *model)
{
    SVDEBUG << "Document::alignModel(" << model << ")" << endl;

    if (!m_mainModel) {
        SVDEBUG << "(no main model to align to)" << endl;
        return;
    }

    RangeSummarisableTimeValueModel *rm = 
        dynamic_cast<RangeSummarisableTimeValueModel *>(model);
    if (!rm) {
        SVDEBUG << "(main model is not alignable-to)" << endl;
        return;
    }

    if (rm->getAlignmentReference() == m_mainModel) {
        SVDEBUG << "(model " << rm << " is already aligned to main model " << m_mainModel << ")" << endl;
        return;
    }
    
    if (model == m_mainModel) {
        // The reference has an empty alignment to itself.  This makes
        // it possible to distinguish between the reference and any
        // unaligned model just by looking at the model itself,
        // without also knowing what the main model is
        SVDEBUG << "Document::alignModel(" << model << "): is main model, setting appropriately" << endl;
        rm->setAlignment(new AlignmentModel(model, model, nullptr, nullptr));
        return;
    }

    if (!m_align->alignModel(m_mainModel, rm)) {
        cerr << "Alignment failed: " << m_align->getError() << endl;
        emit alignmentFailed(m_align->getError());
    }
}

void
Document::alignModels()
{
    for (ModelMap::iterator i = m_models.begin(); i != m_models.end(); ++i) {
        alignModel(i->first);
    }
    alignModel(m_mainModel);
}

Document::AddLayerCommand::AddLayerCommand(Document *d,
                                           View *view,
                                           Layer *layer) :
    m_d(d),
    m_view(view),
    m_layer(layer),
    m_name(qApp->translate("AddLayerCommand", "Add %1 Layer").arg(layer->objectName())),
    m_added(false)
{
}

Document::AddLayerCommand::~AddLayerCommand()
{
#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::AddLayerCommand::~AddLayerCommand" << endl;
#endif
    if (!m_added) {
        m_d->deleteLayer(m_layer);
    }
}

QString
Document::AddLayerCommand::getName() const
{
#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::AddLayerCommand::getName(): Name is "
              << m_name << endl;
#endif
    return m_name;
}

void
Document::AddLayerCommand::execute()
{
    for (int i = 0; i < m_view->getLayerCount(); ++i) {
        if (m_view->getLayer(i) == m_layer) {
            // already there
            m_layer->setLayerDormant(m_view, false);
            m_added = true;
            return;
        }
    }

    m_view->addLayer(m_layer);
    m_layer->setLayerDormant(m_view, false);

    m_d->addToLayerViewMap(m_layer, m_view);
    m_added = true;
}

void
Document::AddLayerCommand::unexecute()
{
    m_view->removeLayer(m_layer);
    m_layer->setLayerDormant(m_view, true);

    m_d->removeFromLayerViewMap(m_layer, m_view);
    m_added = false;
}

Document::RemoveLayerCommand::RemoveLayerCommand(Document *d,
                                                 View *view,
                                                 Layer *layer) :
    m_d(d),
    m_view(view),
    m_layer(layer),
    m_wasDormant(layer->isLayerDormant(view)),
    m_name(qApp->translate("RemoveLayerCommand", "Delete %1 Layer").arg(layer->objectName())),
    m_added(true)
{
}

Document::RemoveLayerCommand::~RemoveLayerCommand()
{
#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::RemoveLayerCommand::~RemoveLayerCommand" << endl;
#endif
    if (!m_added) {
        m_d->deleteLayer(m_layer);
    }
}

QString
Document::RemoveLayerCommand::getName() const
{
#ifdef DEBUG_DOCUMENT
    SVDEBUG << "Document::RemoveLayerCommand::getName(): Name is "
              << m_name << endl;
#endif
    return m_name;
}

void
Document::RemoveLayerCommand::execute()
{
    bool have = false;
    for (int i = 0; i < m_view->getLayerCount(); ++i) {
        if (m_view->getLayer(i) == m_layer) {
            have = true;
            break;
        }
    }

    if (!have) { // not there!
        m_layer->setLayerDormant(m_view, true);
        m_added = false;
        return;
    }

    m_view->removeLayer(m_layer);
    m_layer->setLayerDormant(m_view, true);

    m_d->removeFromLayerViewMap(m_layer, m_view);
    m_added = false;
}

void
Document::RemoveLayerCommand::unexecute()
{
    m_view->addLayer(m_layer);
    m_layer->setLayerDormant(m_view, m_wasDormant);

    m_d->addToLayerViewMap(m_layer, m_view);
    m_added = true;
}

void
Document::toXml(QTextStream &out, QString indent, QString extraAttributes) const
{
    toXml(out, indent, extraAttributes, false);
}

void
Document::toXmlAsTemplate(QTextStream &out, QString indent, QString extraAttributes) const
{
    toXml(out, indent, extraAttributes, true);
}

void
Document::toXml(QTextStream &out, QString indent, QString extraAttributes,
                bool asTemplate) const
{
    out << indent + QString("<data%1%2>\n")
        .arg(extraAttributes == "" ? "" : " ").arg(extraAttributes);

    if (m_mainModel) {

        if (asTemplate) {
            writePlaceholderMainModel(out, indent + "  ");
        } else {
            m_mainModel->toXml(out, indent + "  ", "mainModel=\"true\"");
        }

        PlayParameters *playParameters =
            PlayParameterRepository::getInstance()->getPlayParameters(m_mainModel);
        if (playParameters) {
            playParameters->toXml
                (out, indent + "  ",
                 QString("model=\"%1\"")
                 .arg(XmlExportable::getObjectExportId(m_mainModel)));
        }
    }

    // Models that are not used in a layer that is in a view should
    // not be written.  Get our list of required models first.

    std::set<const Model *> used;

    for (LayerViewMap::const_iterator i = m_layerViewMap.begin();
         i != m_layerViewMap.end(); ++i) {

        if (i->first && !i->second.empty()) { // Layer exists, is in views
            Model *m = i->first->getModel();
            if (m) {
                used.insert(m);
                if (m->getSourceModel()) {
                    used.insert(m->getSourceModel());
                }
            }
        }
    }

    // Write aggregate models first, so that when re-reading
    // derivations we already know about their existence. But only
    // those that are actually used
    //
    // Later note: This turns out not to be a great idea - we can't
    // use an aggregate model to drive a derivation unless its
    // component models have all also already been loaded. So we
    // really should have written non-aggregate read-only
    // (i.e. non-derived) wave-type models first, then aggregate
    // models, then models that have derivations. But we didn't do
    // that, so existing sessions will always have the aggregate
    // models first and we might as well stick with that.

    for (std::set<Model *>::iterator i = m_aggregateModels.begin();
         i != m_aggregateModels.end(); ++i) {

        SVDEBUG << "checking aggregate model " << *i << endl;
        
        AggregateWaveModel *aggregate = qobject_cast<AggregateWaveModel *>(*i);
        if (!aggregate) continue; 
        if (used.find(aggregate) == used.end()) {
            SVDEBUG << "(unused, skipping)" << endl;
            continue;
        }

        SVDEBUG << "(used, writing)" << endl;

        aggregate->toXml(out, indent + "  ");
    }

    std::set<Model *> written;

    // Now write the other models in two passes: first the models that
    // aren't derived from anything (in case they are source
    // components for an aggregate model, in which case we need to
    // have seen them before we see any models derived from aggregates
    // that use them - see the lament above) and then the models that
    // have derivations.

    const int nonDerivedPass = 0, derivedPass = 1;
    for (int pass = nonDerivedPass; pass <= derivedPass; ++pass) {
    
        for (ModelMap::const_iterator i = m_models.begin();
             i != m_models.end(); ++i) {

            Model *model = i->first;
            const ModelRecord &rec = i->second;

            if (used.find(model) == used.end()) continue;
        
            // We need an intelligent way to determine which models
            // need to be streamed (i.e. have been edited, or are
            // small) and which should not be (i.e. remain as
            // generated by a transform, and are large).
            //
            // At the moment we can get away with deciding not to
            // stream dense 3d models or writable wave file models,
            // provided they were generated from a transform, because
            // at the moment there is no way to edit those model types
            // so it should be safe to regenerate them.  That won't
            // always work in future though.  It would be particularly
            // nice to be able to ask the user, as well as making an
            // intelligent guess.

            bool writeModel = true;
            bool haveDerivation = false;
        
            if (rec.source && rec.transform.getIdentifier() != "") {
                haveDerivation = true;
            }

            if (pass == nonDerivedPass) {
                if (haveDerivation) {
                    SVDEBUG << "skipping derived model " << model->objectName() << " during nonDerivedPass" << endl;
                    continue;
                }
            } else {
                if (!haveDerivation) {
                    SVDEBUG << "skipping non-derived model " << model->objectName() << " during derivedPass" << endl;
                    continue;
                }
            }            

            if (haveDerivation) {
                if (dynamic_cast<const WritableWaveFileModel *>(model)) {
                    writeModel = false;
                } else if (dynamic_cast<const DenseThreeDimensionalModel *>(model)) {
                    writeModel = false;
                }
            }
            
            if (writeModel) {
                model->toXml(out, indent + "  ");
                written.insert(model);
            }
            
            if (haveDerivation) {
                writeBackwardCompatibleDerivation(out, indent + "  ",
                                                  model, rec);
            }

            //!!! We should probably own the PlayParameterRepository
            PlayParameters *playParameters =
                PlayParameterRepository::getInstance()->getPlayParameters(model);
            if (playParameters) {
                playParameters->toXml
                    (out, indent + "  ",
                     QString("model=\"%1\"")
                     .arg(XmlExportable::getObjectExportId(model)));
            }
        }
    }

    // We should write out the alignment models here.  AlignmentModel
    // needs a toXml that writes out the export IDs of its reference
    // and aligned models, and then streams its path model.  Note that
    // this will only work when the alignment is complete, so we
    // should probably wait for it if it isn't already by this point.

    for (std::set<Model *>::const_iterator i = written.begin();
         i != written.end(); ++i) {

        const Model *model = *i;
        const AlignmentModel *alignment = model->getAlignment();
        if (!alignment) continue;

        alignment->toXml(out, indent + "  ");
    }

    for (LayerSet::const_iterator i = m_layers.begin();
         i != m_layers.end(); ++i) {

        (*i)->toXml(out, indent + "  ");
    }

    out << indent + "</data>\n";
}

void
Document::writePlaceholderMainModel(QTextStream &out, QString indent) const
{
    out << indent;
    out << QString("<model id=\"%1\" name=\"placeholder\" sampleRate=\"%2\" type=\"wavefile\" file=\":samples/silent.wav\" mainModel=\"true\"/>\n")
        .arg(getObjectExportId(m_mainModel))
        .arg(m_mainModel->getSampleRate());
}

void
Document::writeBackwardCompatibleDerivation(QTextStream &out, QString indent,
                                            Model *targetModel,
                                            const ModelRecord &rec) const
{
    // There is a lot of redundancy in the XML we output here, because
    // we want it to work with older SV session file reading code as
    // well.
    //
    // Formerly, a transform was described using a derivation element
    // which set out the source and target models, execution context
    // (step size, input channel etc) and transform id, containing a
    // plugin element which set out the transform parameters and so
    // on.  (The plugin element came from a "configurationXml" string
    // obtained from PluginXml.)
    // 
    // This has been replaced by a derivation element setting out the
    // source and target models and input channel, containing a
    // transform element which sets out everything in the Transform.
    //
    // In order to retain compatibility with older SV code, however,
    // we have to write out the same stuff into the derivation as
    // before, and manufacture an appropriate plugin element as well
    // as the transform element.  In order that newer code knows it's
    // dealing with a newer format, we will also write an attribute
    // 'type="transform"' in the derivation element.

    const Transform &transform = rec.transform;

    // Just for reference, this is what we would write if we didn't
    // have to be backward compatible:
    //
    //    out << indent
    //        << QString("<derivation type=\"transform\" source=\"%1\" "
    //                   "model=\"%2\" channel=\"%3\">\n")
    //        .arg(XmlExportable::getObjectExportId(rec.source))
    //        .arg(XmlExportable::getObjectExportId(targetModel))
    //        .arg(rec.channel);
    //
    //    transform.toXml(out, indent + "  ");
    //
    //    out << indent << "</derivation>\n";
    // 
    // Unfortunately, we can't just do that.  So we do this...

    QString extentsAttributes;
    if (transform.getStartTime() != RealTime::zeroTime ||
        transform.getDuration() != RealTime::zeroTime) {
        extentsAttributes = QString("startFrame=\"%1\" duration=\"%2\" ")
            .arg(RealTime::realTime2Frame(transform.getStartTime(),
                                          targetModel->getSampleRate()))
            .arg(RealTime::realTime2Frame(transform.getDuration(),
                                          targetModel->getSampleRate()));
    }
            
    out << indent;
    out << QString("<derivation type=\"transform\" source=\"%1\" "
                   "model=\"%2\" channel=\"%3\" domain=\"%4\" "
                   "stepSize=\"%5\" blockSize=\"%6\" %7windowType=\"%8\" "
                   "transform=\"%9\">\n")
        .arg(XmlExportable::getObjectExportId(rec.source))
        .arg(XmlExportable::getObjectExportId(targetModel))
        .arg(rec.channel)
        .arg(TransformFactory::getInstance()->getTransformInputDomain
             (transform.getIdentifier()))
        .arg(transform.getStepSize())
        .arg(transform.getBlockSize())
        .arg(extentsAttributes)
        .arg(int(transform.getWindowType()))
        .arg(XmlExportable::encodeEntities(transform.getIdentifier()));

    transform.toXml(out, indent + "  ");
    
    out << indent << "  "
        << TransformFactory::getInstance()->getPluginConfigurationXml(transform);

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