/// <summary>
/// Translate base type of a model EntityType into view Inheritance (creates an Inheritance if not yet created)
/// </summary>
/// <param name="viewModel"></param>
/// <param name="entityType"></param>
/// <returns></returns>
private static Inheritance TranslateBaseType(EntityDesignerViewModel viewModel, ConceptualEntityType entityType)
{
if (entityType.BaseType.Status == BindingStatus.Known)
{
var baseType =
ModelToDesignerModelXRef.GetExisting(viewModel.EditingContext, entityType.BaseType.Target, viewModel.Partition) as
ViewModelEntityType;
var derivedType =
ModelToDesignerModelXRef.GetExisting(viewModel.EditingContext, entityType, viewModel.Partition) as ViewModelEntityType;
// in Multiple diagram scenario, baseType and derivedType might not exist in the diagram.
if (baseType != null &&
derivedType != null)
{
return
(ModelToDesignerModelXRef.GetNewOrExisting(viewModel.EditingContext, entityType.BaseType, baseType, derivedType) as
Inheritance);
}
}
return(null);
}
/// <summary>
/// Translate model NavigationProperty into view NavigationProperty (creates a view NavigationProperty if not yet created)
/// </summary>
private ViewModelNavigationProperty TranslateNavigationProperty(ViewModelEntityType viewEntityType, ModelNavigationProperty navProp)
{
var viewNavProp =
ModelToDesignerModelXRef.GetNewOrExisting(EditingContext, navProp, viewEntityType.Partition) as ViewModelNavigationProperty;
Debug.Assert(viewNavProp != null, "Expected non-null navigation property");
viewNavProp.Name = navProp.LocalName.Value;
if (navProp.Relationship.Status == BindingStatus.Known)
{
var association =
ModelToDesignerModelXRef.GetExisting(EditingContext, navProp.Relationship.Target, viewEntityType.Partition) as
ViewModelAssociation;
// Association might be null here if the related entity does not exist in the current diagram.
if (association != null)
{
viewNavProp.Association = association;
// On a self-relationship case, we ensure that the Source and Target NavProps are not set with the same value.
// The source is set first only if SourceEntity == TargetEntityType and the Source navprop has not been set yet. The other case would be
// if this is not a self-relationship.
if (viewEntityType == association.SourceEntityType &&
((association.SourceEntityType == association.TargetEntityType && association.SourceNavigationProperty == null) ||
(association.SourceEntityType != association.TargetEntityType)))
{
association.SourceNavigationProperty = viewNavProp;
}
// SourceEntityType might be the same as TargetEntityType, so we need to check this as well
if (viewEntityType == association.TargetEntityType)
{
association.TargetNavigationProperty = viewNavProp;
}
}
}
return(viewNavProp);
}
/// <summary>
/// Translate model Association into view Association (creates a view Association if not yet created)
/// </summary>
/// <param name="viewModel"></param>
/// <param name="association"></param>
/// <returns></returns>
private static ViewModelAssociation TranslateAssociation(
EntityDesignerViewModel viewModel,
ModelAssociation association)
{
var ends = association.AssociationEnds();
var end1 = ends[0];
var end2 = ends[1];
if (end1.Type.Status == BindingStatus.Known &&
end2.Type.Status == BindingStatus.Known)
{
var viewEnd1 =
ModelToDesignerModelXRef.GetExisting(viewModel.EditingContext, end1.Type.Target, viewModel.Partition) as
ViewModelEntityType;
var viewEnd2 =
ModelToDesignerModelXRef.GetExisting(viewModel.EditingContext, end2.Type.Target, viewModel.Partition) as
ViewModelEntityType;
// Only create association if both entityType exist.
if (viewEnd1 != null &&
viewEnd2 != null)
{
var viewAssoc =
ModelToDesignerModelXRef.GetNewOrExisting(viewModel.EditingContext, association, viewEnd1, viewEnd2) as
ViewModelAssociation;
viewAssoc.Name = association.LocalName.Value;
viewAssoc.SourceMultiplicity = end1.Multiplicity.Value;
viewAssoc.TargetMultiplicity = end2.Multiplicity.Value;
// There could be a situation where association is created after navigation property (for example: the user add an entity-type and then add related types ).
// In that case we need to make sure that view's association and navigation property are linked.
Debug.Assert(
end1.Type.Target != null, "Association End: " + end1.DisplayName + " does not reference a valid entity-type.");
if (end1.Type.Target != null)
{
var modelSourceNavigationProperty =
ModelHelper.FindNavigationPropertyForAssociationEnd(end1.Type.Target as ConceptualEntityType, end1);
if (modelSourceNavigationProperty != null)
{
var viewSourceNavigationProperty =
ModelToDesignerModelXRef.GetExisting(
viewModel.EditingContext, modelSourceNavigationProperty, viewModel.Partition) as
ViewModelNavigationProperty;
if (viewSourceNavigationProperty != null)
{
viewAssoc.SourceNavigationProperty = viewSourceNavigationProperty;
viewSourceNavigationProperty.Association = viewAssoc;
}
}
}
Debug.Assert(
end2.Type.Target != null, "Association End: " + end2.DisplayName + " does not reference a valid entity-type.");
if (end2.Type.Target != null)
{
var modelTargetNavigatioNProperty =
ModelHelper.FindNavigationPropertyForAssociationEnd(end2.Type.Target as ConceptualEntityType, end2);
if (modelTargetNavigatioNProperty != null)
{
var viewTargetNavigationProperty =
ModelToDesignerModelXRef.GetExisting(
viewModel.EditingContext, modelTargetNavigatioNProperty, viewModel.Partition) as
ViewModelNavigationProperty;
if (viewTargetNavigationProperty != null)
{
viewAssoc.TargetNavigationProperty = viewTargetNavigationProperty;
viewTargetNavigationProperty.Association = viewAssoc;
}
}
}
return(viewAssoc);
}
}
return(null);
}
