private IEnumerable <Command> CreateCommandFromElement(XElement element)
{
Debug.Assert(element.HasAttributes, element.ToString());
switch (element.LocalName())
{
case ElementNames.Set:
{
foreach (XAttribute attribute in element.Attributes())
{
yield return(CreateCommandFromAttribute(attribute));
}
break;
}
case ElementNames.Append:
{
foreach (XAttribute attribute in element.Attributes())
{
yield return(new AppendCommand(GetPropertyName(attribute), GetValue(attribute)));
}
break;
}
case ElementNames.Prefix:
{
foreach (XAttribute attribute in element.Attributes())
{
yield return(new PrefixCommand(GetPropertyName(attribute), GetValue(attribute)));
}
break;
}
case ElementNames.Tag:
{
XAttribute attribute = element
.Attributes()
.FirstOrDefault(f => f.LocalName() == AttributeNames.Value);
if (attribute != null)
{
yield return(new AddTagCommand(GetValue(attribute)));
}
break;
}
case ElementNames.Add:
{
foreach (XAttribute attribute in element.Attributes())
{
string propertyName = GetAttributeName(attribute);
PropertyDefinition property = Entity.FindProperty(propertyName);
if (property == null)
{
Throw(ExceptionMessages.PropertyIsNotDefined(propertyName));
}
else if (!property.IsCollection)
{
Throw(ExceptionMessages.CannotAddItemToNonCollectionProperty(propertyName));
}
yield return(new AddItemCommand(propertyName, GetValue(attribute)));
}
break;
}
default:
{
Throw(ExceptionMessages.CommandIsNotDefined(element.LocalName()));
break;
}
}
}
