void PropertyConstraintList::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("ConstraintList");
    // get the value of my attribute
    int count = reader.getAttributeAsInteger("count");

    std::vector<Constraint*> values;
    values.reserve(count);
    for (int i = 0; i < count; i++) {
        Constraint *newC = new Constraint();
        newC->Restore(reader);
        // To keep upward compatibility ignore unknown constraint types
        if (newC->Type < Sketcher::NumConstraintTypes) {
            values.push_back(newC);
        }
        else {
            // reading a new constraint type which this version cannot handle
            delete newC;
        }
    }

    reader.readEndElement("ConstraintList");

    // assignment
    setValues(values);
    for (Constraint* it : values)
        delete it;
}

void PropertyLinkList::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("LinkList");
    // get the value of my attribute
    int count = reader.getAttributeAsInteger("count");
    assert(getContainer()->getTypeId().isDerivedFrom(App::DocumentObject::getClassTypeId()) );

    std::vector<DocumentObject*> values;
    values.reserve(count);
    for (int i = 0; i < count; i++) {
        reader.readElement("Link");
        std::string name = reader.getAttribute("value");
        // In order to do copy/paste it must be allowed to have defined some
        // referenced objects in XML which do not exist anymore in the new
        // document. Thus, we should silently ingore this.
        // Property not in an object!
        DocumentObject* father = static_cast<DocumentObject*>(getContainer());
        DocumentObject* child = father->getDocument()->getObject(name.c_str());
        if (child)
            values.push_back(child);
        else
            Base::Console().Warning("Lost link to '%s' while loading, maybe "
                                    "an object was not loaded correctly\n",name.c_str());
    }

    reader.readEndElement("LinkList");

    // assignment
    setValues(values);
}

void PropertyPythonObject::restoreObject(Base::XMLReader &reader)
{
    Base::PyGILStateLocker lock;
    try {
        PropertyContainer* parent = this->getContainer();
        if (reader.hasAttribute("object")) {
            if (strcmp(reader.getAttribute("object"),"yes") == 0) {
                Py::Object obj = Py::asObject(parent->getPyObject());
                this->object.setAttr("__object__", obj);
            }
        }
        if (reader.hasAttribute("vobject")) {
            if (strcmp(reader.getAttribute("vobject"),"yes") == 0) {
                Py::Object obj = Py::asObject(parent->getPyObject());
                this->object.setAttr("__vobject__", obj);
            }
        }
    }
    catch (Py::Exception& e) {
        e.clear();
    }
    catch (const Base::Exception& e) {
        Base::Console().Error("%s\n",e.what());
    }
    catch (...) {
        Base::Console().Error("Critical error in PropertyPythonObject::restoreObject\n");
    }
}

void PropertyFloat::Restore(Base::XMLReader &reader)
{
    // read my Element
    reader.readElement("Float");
    // get the value of my Attribute
    setValue((float)reader.getAttributeAsFloat("value"));
}

void PropertyMeshKernel::Restore(Base::XMLReader &reader)
{
    reader.readElement("Mesh");
    std::string file (reader.getAttribute("file") );
    
    if (file.empty()) {
        // read XML
        MeshCore::MeshKernel kernel;
        MeshCore::MeshInput restorer(kernel);
        restorer.LoadXML(reader);

        // avoid to duplicate the mesh in memory
        MeshCore::MeshPointArray points;
        MeshCore::MeshFacetArray facets;
        kernel.Adopt(points, facets);

        aboutToSetValue();
        _meshObject->getKernel().Adopt(points, facets);
        hasSetValue();
    } 
    else {
        // initate a file read
        reader.addFile(file.c_str(),this);
    }
}

void PropertyLink::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("Link");
    // get the value of my attribute
    std::string name = reader.getAttribute("value");

    // Property not in a DocumentObject!
    assert(getContainer()->getTypeId().isDerivedFrom(App::DocumentObject::getClassTypeId()) );

    if (name != "") {
        DocumentObject* parent = static_cast<DocumentObject*>(getContainer());

        App::Document* document = parent->getDocument();
        DocumentObject* object = document ? document->getObject(name.c_str()) : 0;
        if (!object) {
            if (reader.isVerbose()) {
                Base::Console().Warning("Lost link to '%s' while loading, maybe "
                                        "an object was not loaded correctly\n",name.c_str());
            }
        }
        else if (parent == object) {
            if (reader.isVerbose()) {
                Base::Console().Warning("Object '%s' links to itself, nullify it\n",name.c_str());
            }
            object = 0;
        }

        setValue(object);
    }
    else {
        setValue(0);
    }
}

void PropertyGreyValueList::Restore(Base::XMLReader &reader)
{
    reader.readElement("FloatList");
    string file (reader.getAttribute("file") );

    if (!file.empty()) {
        // initate a file read
        reader.addFile(file.c_str(),this);
    }
}

void PropertyFilletEdges::Restore(Base::XMLReader &reader)
{
    reader.readElement("FilletEdges");
    std::string file (reader.getAttribute("file") );

    if (!file.empty()) {
        // initate a file read
        reader.addFile(file.c_str(),this);
    }
}

void PropertyColumnWidths::Restore(Base::XMLReader &reader)
{
    int Cnt;

    // Column info
    reader.readElement("ColumnInfo");
    Cnt = reader.hasAttribute("Count") ? reader.getAttributeAsInteger("Count") : 0;
    for (int i = 0; i < Cnt; i++) {
        reader.readElement("Column");
        const char* name = reader.hasAttribute("name") ? reader.getAttribute("name") : 0;
        const char * width = reader.hasAttribute("width") ? reader.getAttribute("width") : 0;

        try {
            if (name && width) {
                int col = App::decodeColumn(name);
                int colWidth = atoi(width);

                setValue(col, colWidth);
            }
        }
        catch (...) {
            // Something is wrong, skip this column
        }

    }
    reader.readEndElement("ColumnInfo");
}

void PropertyRowHeights::Restore(Base::XMLReader &reader)
{
    int Cnt;

    // Row info
    reader.readElement("RowInfo");
    Cnt = reader.hasAttribute("Count") ? reader.getAttributeAsInteger("Count") : 0;
    for (int i = 0; i < Cnt; i++) {
        reader.readElement("Row");
        const char* name = reader.hasAttribute("name") ? reader.getAttribute("name") : 0;
        const char * height = reader.hasAttribute("height") ? reader.getAttribute("height") : 0;

        try {
            if (name && height) {
                int row = App::decodeRow(name);
                int rowHeight = atoi(height);

                setValue(row, rowHeight);
            }
        }
        catch (...) {
            // Something is wrong, skip this row
        }
    }
    reader.readEndElement("RowInfo");
}

void PropertyVector::Restore(Base::XMLReader &reader)
{
    // read my Element
    reader.readElement("PropertyVector");
    // get the value of my Attribute
    aboutToSetValue();
    _cVec.x = reader.getAttributeAsFloat("valueX");
    _cVec.y = reader.getAttributeAsFloat("valueY");
    _cVec.z = reader.getAttributeAsFloat("valueZ");
    hasSetValue();
}

void PropertyFileIncluded::Restore(Base::XMLReader &reader)
{
    reader.readElement("FileIncluded");
    if (reader.hasAttribute("file")) {
        string file (reader.getAttribute("file") );
        if (!file.empty()) {
            // initate a file read
            reader.addFile(file.c_str(),this);
            // is in the document transient path
            aboutToSetValue();
            _cValue = getDocTransientPath() + "/" + file;
            _BaseFileName = file;
            hasSetValue();
        }
    }
    // section is XML stream
    else if (reader.hasAttribute("data")) {
        string file (reader.getAttribute("data") );
        if (!file.empty()) {
            // is in the document transient path
            aboutToSetValue();
            _cValue = getDocTransientPath() + "/" + file;
            reader.readBinFile(_cValue.c_str());
            reader.readEndElement("FileIncluded");
            _BaseFileName = file;
            hasSetValue();
        }
    }
}

void PointKernel::Restore(Base::XMLReader &reader)
{
    clear();

    reader.readElement("Points");
    std::string file (reader.getAttribute("file") );

    if (!file.empty()) {
        // initiate a file read
        reader.addFile(file.c_str(),this);
    }
    if (reader.DocumentSchema > 3) {
        std::string Matrix (reader.getAttribute("mtrx") );
        _Mtrx.fromString(Matrix);
    }
}

void PropertyLinkSubList::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("LinkSubList");
    // get the value of my attribute
    int count = reader.getAttributeAsInteger("count");

    std::vector<DocumentObject*> values;
    values.reserve(count);
    std::vector<std::string> SubNames;
    SubNames.reserve(count);
    for (int i = 0; i < count; i++) {
        reader.readElement("Link");
        std::string name = reader.getAttribute("obj");
        // In order to do copy/paste it must be allowed to have defined some
        // referenced objects in XML which do not exist anymore in the new
        // document. Thus, we should silently ignore this.
        // Property not in an object!
        DocumentObject* father = dynamic_cast<DocumentObject*>(getContainer());
        App::Document* document = father ? father->getDocument() : 0;
        DocumentObject* child = document ? document->getObject(name.c_str()) : 0;
        if (child)
            values.push_back(child);
        else if (reader.isVerbose())
            Base::Console().Warning("Lost link to '%s' while loading, maybe "
                                    "an object was not loaded correctly\n",name.c_str());
        std::string subName = reader.getAttribute("sub");
        SubNames.push_back(subName);
    }

    reader.readEndElement("LinkSubList");

    // assignment
    setValues(values,SubNames);
}

/** 
 * Loads a separate XML file from the projects file with information about the view providers.
 */
void Document::Restore(Base::XMLReader &reader)
{
    reader.addFile("GuiDocument.xml",this);
    // hide all elements to avoid to update the 3d view when loading data files
    // RestoreDocFile then restores the visibility status again
    std::map<const App::DocumentObject*,ViewProviderDocumentObject*>::iterator it;
    for (it = d->_ViewProviderMap.begin(); it != d->_ViewProviderMap.end(); ++it) {
        it->second->startRestoring();
    }
}

void PropertyPointKernel::Restore(Base::XMLReader &reader)
{
    reader.readElement("Points");
    std::string file (reader.getAttribute("file") );

    if (!file.empty()) {
        // initate a file read
        reader.addFile(file.c_str(),this);
    }
    if(reader.DocumentSchema > 3)
    {
        std::string Matrix (reader.getAttribute("mtrx") );
        Base::Matrix4D mtrx;
        mtrx.fromString(Matrix);

        aboutToSetValue();
        _cPoints->setTransform(mtrx);
        hasSetValue();
    }
}

void MergeDocuments::importObject(const std::vector<App::DocumentObject*>& o, Base::XMLReader & r)
{
    objects = o;
    for (std::vector<App::DocumentObject*>::iterator it = objects.begin(); it != objects.end(); ++it) {
        Gui::ViewProvider* vp = document->getViewProvider(*it);
        if (vp) vp->hide();
    }
    Restore(r);

    r.readFiles(*this->stream);
}

void Chamfer::Restore(Base::XMLReader &reader)
{
    reader.readElement("Properties");
    int Cnt = reader.getAttributeAsInteger("Count");

    for (int i=0 ;i<Cnt ;i++) {
        reader.readElement("Property");
        const char* PropName = reader.getAttribute("name");
        const char* TypeName = reader.getAttribute("type");
        App::Property* prop = getPropertyByName(PropName);

        try {
            if (prop && strcmp(prop->getTypeId().getName(), TypeName) == 0) {
                prop->Restore(reader);
            }
            else if (prop && strcmp(TypeName,"App::PropertyFloatConstraint") == 0 &&
                     strcmp(prop->getTypeId().getName(), "App::PropertyQuantityConstraint") == 0) {
                App::PropertyFloatConstraint p;
                p.Restore(reader);
                static_cast<App::PropertyQuantityConstraint*>(prop)->setValue(p.getValue());
            }
        }
        catch (const Base::XMLParseException&) {
            throw; // re-throw
        }
        catch (const Base::Exception &e) {
            Base::Console().Error("%s\n", e.what());
        }
        catch (const std::exception &e) {
            Base::Console().Error("%s\n", e.what());
        }
        reader.readEndElement("Property");
    }
    reader.readEndElement("Properties");
}

void Part2DObject::Restore(Base::XMLReader &reader)
{
    //override generic restoration to convert Support property from PropertyLinkSub to PropertyLinkSubList

    reader.readElement("Properties");
    int Cnt = reader.getAttributeAsInteger("Count");

    for (int i=0 ;i<Cnt ;i++) {
        reader.readElement("Property");
        const char* PropName = reader.getAttribute("name");
        const char* TypeName = reader.getAttribute("type");
        App::Property* prop = getPropertyByName(PropName);
        // NOTE: We must also check the type of the current property because a
        // subclass of PropertyContainer might change the type of a property but
        // not its name. In this case we would force to read-in a wrong property
        // type and the behaviour would be undefined.
        try {
            if(prop){
                if (strcmp(prop->getTypeId().getName(), TypeName) == 0){
                    prop->Restore(reader);
                } else if (prop->isDerivedFrom(App::PropertyLinkSubList::getClassTypeId())){
                    //reading legacy Support - when the Support could only be a single flat face.
                    App::PropertyLinkSub tmp;
                    if (0 == strcmp(tmp.getTypeId().getName(),TypeName)) {
                        tmp.setContainer(this);
                        tmp.Restore(reader);
                        static_cast<App::PropertyLinkSubList*>(prop)->setValue(tmp.getValue(), tmp.getSubValues());
                    }
                    this->MapMode.setValue(Attacher::mmFlatFace);
                }
            }
        }
        catch (const Base::XMLParseException&) {
            throw; // re-throw
        }
        catch (const Base::Exception &e) {
            Base::Console().Error("%s\n", e.what());
        }
        catch (const std::exception &e) {
            Base::Console().Error("%s\n", e.what());
        }
        catch (const char* e) {
            Base::Console().Error("%s\n", e);
        }
#ifndef FC_DEBUG
        catch (...) {
            Base::Console().Error("PropertyContainer::Restore: Unknown C++ exception thrown");
        }
#endif

        reader.readEndElement("Property");
    }
    reader.readEndElement("Properties");
}

void PropertyExpressionEngine::Restore(Base::XMLReader &reader)
{
    reader.readElement("ExpressionEngine");

    int count = reader.getAttributeAsFloat("count");

    for (int i = 0; i < count; ++i) {
        DocumentObject * docObj = freecad_dynamic_cast<DocumentObject>(getContainer());

        reader.readElement("Expression");
        ObjectIdentifier path = ObjectIdentifier::parse(docObj, reader.getAttribute("path"));
        boost::shared_ptr<Expression> expression(ExpressionParser::parse(docObj, reader.getAttribute("expression")));
        const char * comment = reader.hasAttribute("comment") ? reader.getAttribute("comment") : 0;

        setValue(path, expression, comment);
    }

    reader.readEndElement("ExpressionEngine");
}