public override void StartElement(string name, Variant attributes, Variant.EnumType variantType)
{
ElementInfo context = new ElementInfo(name, attributes, variantType);
if (m_stack.Count != 0)
{
ElementInfo parentContext = m_stack.Peek();
switch (parentContext.m_type)
{
case Variant.EnumType.Any:
if (!parentContext.m_isTyped)
{
// Untyped elements with children are converted to Bags
parentContext.m_type = Variant.EnumType.Bag;
parentContext.m_element = new Variant(parentContext.m_type);
}
break;
case Variant.EnumType.None:
case Variant.EnumType.String:
case Variant.EnumType.Int32:
case Variant.EnumType.UInt32:
case Variant.EnumType.Int64:
case Variant.EnumType.UInt64:
case Variant.EnumType.Float:
case Variant.EnumType.Double:
case Variant.EnumType.Boolean:
case Variant.EnumType.Date:
case Variant.EnumType.Time:
case Variant.EnumType.DateTime:
case Variant.EnumType.Buffer:
throw new VariantException("Unexpected start element");
case Variant.EnumType.TimeSeries:
if (context.m_attributes.ContainsKey("time"))
{
context.m_time = context.m_attributes["time"].As <DateTime>();
context.m_attributes.Remove("time");
}
else
{
throw new VariantException("Missing 'time' attribute for TimeSeries element");
}
break;
}
}
m_stack.Push(context);
// infer type from 'variant' attribute
if (context.m_attributes.ContainsKey("variant"))
{
context.m_type = Variant.StringToEnum(context.m_attributes["variant"].As <string>());
context.m_isTyped = true;
context.m_attributes.Remove("variant");
}
switch (context.m_type)
{
case Variant.EnumType.Any:
if (!context.m_isTyped && !context.m_attributes.Empty)
{
// untyped elements with attributes are assumed
// to be bags
context.m_type = Variant.EnumType.Bag;
context.m_element = new Variant(context.m_type);
}
break;
case Variant.EnumType.None:
case Variant.EnumType.String:
case Variant.EnumType.Int32:
case Variant.EnumType.UInt32:
case Variant.EnumType.Int64:
case Variant.EnumType.UInt64:
case Variant.EnumType.Float:
case Variant.EnumType.Double:
case Variant.EnumType.Boolean:
case Variant.EnumType.Date:
case Variant.EnumType.Time:
case Variant.EnumType.DateTime:
case Variant.EnumType.Buffer:
break;
case Variant.EnumType.List:
case Variant.EnumType.Dictionary:
case Variant.EnumType.Bag:
case Variant.EnumType.TimeSeries:
context.m_element = new Variant(context.m_type);
break;
case Variant.EnumType.Exception:
case Variant.EnumType.Object:
// Exception and Object are parsed via a dictionary for convenience.
context.m_element = new Variant(Variant.EnumType.Dictionary);
break;
case Variant.EnumType.Tuple:
{
if (context.m_attributes.ContainsKey("size"))
{
context.m_element = new Variant(Variant.EnumType.Tuple, context.m_attributes["size"].As <int>());
context.m_attributes.Remove("size");
}
else
{
throw new VariantException("Missing 'size' attribute for Tuple variant");
}
break;
}
default:
throw new VariantException("Case exhaustion: " + context.m_type.ToString());
}
}