private ChangeData CreateChangeData(DescriptorData descriptorData, IDictionary <object, IEnumerable <NamedValue> > propertyValuesBeforeSave)
{
var entityDescriptorData = descriptorData as EntityDescriptorData;
if (entityDescriptorData != null)
{
IEnumerable <NamedValue> propertyValues;
ExceptionUtilities.Assert(propertyValuesBeforeSave.TryGetValue(entityDescriptorData.Entity, out propertyValues), "Could not find property values for descriptor: {0}", entityDescriptorData);
return(EntityChangeData.Create(entityDescriptorData, propertyValues));
}
var linkDescriptorData = descriptorData as LinkDescriptorData;
ExceptionUtilities.CheckObjectNotNull(linkDescriptorData, "Descriptor was neither an entity nor a link");
return(LinkChangeData.Create(linkDescriptorData));
}
