public static object CastArg([Implict] Executive engine, object value, XQuerySequenceType destType)
{
XQueryContext context = (XQueryContext)engine.Owner;
if (destType == XQuerySequenceType.Item)
return value;
if (value == Undefined.Value)
{
if (destType.Cardinality == XmlTypeCardinality.ZeroOrMore)
return EmptyIterator.Shared;
if (destType.TypeCode != XmlTypeCode.None && destType.Cardinality != XmlTypeCardinality.ZeroOrOne)
throw new XQueryException(Properties.Resources.XPTY0004, "empty-sequence()", destType);
return Undefined.Value;
}
if (destType.Cardinality == XmlTypeCardinality.One ||
destType.Cardinality == XmlTypeCardinality.ZeroOrOne)
{
object res;
XQueryNodeIterator iter = value as XQueryNodeIterator;
if (iter != null)
{
iter = iter.Clone();
if (!iter.MoveNext())
{
if (destType.TypeCode != XmlTypeCode.None &&
(destType.Cardinality == XmlTypeCardinality.One || destType.Cardinality == XmlTypeCardinality.OneOrMore))
throw new XQueryException(Properties.Resources.XPTY0004, "empty-sequence()", destType);
return Undefined.Value;
}
if (destType.IsNode)
{
if (!destType.Match(iter.Current, context))
throw new XQueryException(Properties.Resources.XPTY0004,
new XQuerySequenceType(iter.Current.XmlType, XmlTypeCardinality.OneOrMore, null), destType);
res = iter.Current.Clone();
}
else
res = XQueryConvert.ValueAs(iter.Current.TypedValue, destType, context.nameTable, context.NamespaceManager);
if (iter.MoveNext())
throw new XQueryException(Properties.Resources.MoreThanOneItem);
return res;
}
else
{
XPathItem item = value as XPathItem;
if (item != null)
{
if (item.IsNode)
{
if (!destType.Match(item, context))
throw new XQueryException(Properties.Resources.XPTY0004,
new XQuerySequenceType(item.XmlType, XmlTypeCardinality.OneOrMore, null), destType);
return item;
}
else
return XQueryConvert.ValueAs(item.TypedValue, destType,
context.nameTable, context.NamespaceManager);
}
return XQueryConvert.ValueAs(value, destType, context.nameTable, context.NamespaceManager);
}
}
else
return new NodeIterator(XPathFactory.ValueIterator(XQueryNodeIterator.Create(value), destType, context));
}
public static bool InstanceOf([Implict] Executive engine, object value, XQuerySequenceType destType)
{
XQueryContext context = (XQueryContext)engine.Owner;
if (value == Undefined.Value)
return destType.Cardinality == XmlTypeCardinality.ZeroOrOne ||
destType.Cardinality == XmlTypeCardinality.ZeroOrMore;
if (value == null)
value = CoreServices.Generation.RuntimeOps.False;
XQueryNodeIterator iter = value as XQueryNodeIterator;
if (iter != null)
{
int num = 0;
foreach (XPathItem item in iter)
{
if (num == 1)
{
if (destType.Cardinality == XmlTypeCardinality.ZeroOrOne ||
destType.Cardinality == XmlTypeCardinality.One)
return false;
}
if (!destType.Match(item, context))
return false;
num++;
}
if (num == 0)
{
if (destType.TypeCode != XmlTypeCode.None && (destType.Cardinality == XmlTypeCardinality.One ||
destType.Cardinality == XmlTypeCardinality.OneOrMore))
return false;
}
return true;
}
else
{
if (destType.ItemType == value.GetType())
return true;
XPathItem item = value as XPathItem;
if (item == null)
item = new XQueryItem(value);
return destType.Match(item, context);
}
}
