/// <summary> Write the attributes of a SifElement to the output stream</summary>
/// <param name="o">The SifElement whose attributes are to be written
/// </param>
private void WriteAttributes(SifElement o)
{
// TODO: We need to make sure the GetFields() API returns a usable collection
ICollection <SimpleField> fields = fFormatter.GetFields(o, fVersion);
foreach (SimpleField f in fields)
{
IElementVersionInfo evi = f.ElementDef.GetVersionInfo(fVersion);
if (evi != null && evi.IsAttribute)
{
// Null attribute values are not supported in SIF, unlike
// element values, which can be represented with xs:nil
SifSimpleType sst = f.SifValue;
if (sst.RawValue != null)
{
String tag = evi.Tag;
Boolean handled = false;
if (tag.StartsWith("x"))
{
if (evi.Tag.Equals("xml:lang"))
{
fWriter.WriteAttributeString("xml", "lang", null, sst.ToString(fFormatter));
}
else if (evi.Tag.Equals("xsi:type"))
{
fWriter.WriteAttributeString("type", XmlSchema.InstanceNamespace, sst.ToString(fFormatter));
}
handled = true;
}
if (!handled)
{
fWriter.WriteStartAttribute(evi.Tag, string.Empty);
fWriter.WriteString(sst.ToString(fFormatter));
fWriter.WriteEndAttribute();
}
}
}
}
if (fSerializeIds && o.XmlId != null)
{
fWriter.WriteAttributeString("id", XML_NAMESPACE, o.XmlId);
}
}
private void ParseLegacyXML(
XmlReader reader,
SifVersion version,
IZone zone,
SifElement currentElement,
SifFormatter formatter,
String xmlName)
{
bool handled = false;
// Determine if any surrogate formatters that are defined as children
// of the current element can resolve it
// NOTE: Until we fix this in the ADK, elements from the common package loose their
// metadata information that was originally defined.
IElementDef currentDef = currentElement.ElementDef;
IList <IElementDef> children = currentDef.Children;
if (children == null || children.Count == 0)
{
// try to get the actual element def
// WARNING! this is somewhat of a hack until
// we get support for what we need in the ADK metadata
try
{
SifElement copy =
(SifElement)ClassFactory.CreateInstance(currentDef.FQClassName);
children = copy.ElementDef.Children;
}
catch (Exception cnfe)
{
throw new SifException(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_GENERIC_VALIDATION_3,
"Unable to parse" + xmlName + " " + version.ToString() + cnfe.Message, zone);
}
}
using (XmlReader subtreeReader = reader.ReadSubtree())
{
subtreeReader.Read();
foreach (IElementDef candidate in children)
{
if (candidate.EarliestVersion.CompareTo(version) > 0)
{
continue;
}
IElementVersionInfo evi = candidate.GetVersionInfo(version);
if (evi != null)
{
IRenderSurrogate rs = evi.GetSurrogate();
if (rs != null)
{
try
{
bool surrogateHandled = rs.ReadRaw(subtreeReader, version, currentElement, formatter);
if (surrogateHandled)
{
handled = true;
break;
}
}
catch (AdkTypeParseException e)
{
HandleTypeParseException("Unable to parse element or attribute value: " + e.Message, e,
zone);
handled = true;
break;
}
catch (AdkParsingException e)
{
throw new SifException(SifErrorCategoryCode.Xml,
SifErrorCodes.XML_GENERIC_VALIDATION_3,
"unable to parse xml: " + e.Message
+ version.ToString(), zone);
}
}
}
}
subtreeReader.Close();
}
// advance to the next tag
reader.Read();
if (!handled)
{
String _tag = currentElement != null
? currentElement.ElementDef.Name + "/" + xmlName
: xmlName;
throw new SifException(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_GENERIC_VALIDATION_3, "Unknown element or attribute",
_tag + " is not a recognized element of SIF " + version.ToString(), zone);
}
}
private SifElement ParseElementStream(XmlReader reader,
SifVersion version,
IDtd dtd,
IZone zone,
SifParserFlags flags)
{
bool legacyParse = version.CompareTo(SifVersion.SIF20) < 0;
// The current SIFElement being parsed
SifElement currentElement = null;
// The actual tag name of the current element
SifFormatter formatter = Adk.Dtd.GetFormatter(version);
reader.MoveToContent();
bool doneParsing = false;
while (!(reader.EOF || doneParsing))
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
if (reader.LocalName == "SIF_Message")
{
// Special case for embedded SIF_Message envelopes
if ((flags & SifParserFlags.ExpectInnerEnvelope) != 0)
{
SifElement msgElement =
ReadSIFMessageElement(reader, dtd, zone, SifParserFlags.None, version);
currentElement.AddChild(msgElement);
currentElement = msgElement;
}
else
{
throw new AdkParsingException
("Unexpected SIF_Message encountered in parsing", zone);
}
}
else
{
String xmlName = reader.LocalName;
if (xmlName == "Teacher")
{
Console.WriteLine("Ready to break");
}
IElementDef foundDef = LookupElementDef(currentElement, reader, dtd, version, zone);
if (foundDef == null)
{
if (legacyParse)
{
ParseLegacyXML(reader, version, zone, currentElement, formatter, xmlName);
continue;
}
else if (currentElement != null && currentElement.ElementDef.Name.Equals("XMLData"))
{
// Parse this into a DOM and set on the XMLData
// element
XmlReader nestedReader = reader.ReadSubtree();
XmlDocument doc = new XmlDocument();
doc.Load(nestedReader);
((XMLData)currentElement).Xml = doc;
continue;
}
else
{
String _tag = currentElement != null ? currentElement.ElementDef.Name
+ "/" + xmlName
: xmlName;
throw new SifException(SifErrorCategoryCode.Xml, SifErrorCodes.XML_GENERIC_VALIDATION_3, "Unknown element or attribute", _tag
+ " is not a recognized element of SIF "
+ version.ToString(), zone);
}
}
if (legacyParse)
{
IElementVersionInfo evi = foundDef.GetVersionInfo(version);
if (evi != null)
{
IRenderSurrogate rs = evi.GetSurrogate();
if (rs != null)
{
using (XmlReader subtreeReader = reader.ReadSubtree())
{
bool shouldContinue = true;
subtreeReader.Read();
try
{
shouldContinue = rs.ReadRaw(subtreeReader, version, currentElement, formatter);
}
catch (AdkTypeParseException atpe)
{
HandleTypeParseException("Unable to parse value: " + atpe.Message, atpe,
zone);
}
subtreeReader.Close();
// advance to the next tag
reader.Read();
if (shouldContinue)
{
continue;
}
else
{
throw new SifException(SifErrorCategoryCode.Xml,
SifErrorCodes.XML_GENERIC_VALIDATION_3,
"Unknown element or attribute", reader.LocalName
+
" was not able to be parsed by "
+ rs, zone);
}
}
}
}
}
if (foundDef.Field)
{
SetFieldValueFromElement
(foundDef, currentElement, reader, version, formatter, zone);
// Advance to the next tag
do
{
reader.Read();
} while (
!(reader.EOF || reader.NodeType == XmlNodeType.Element ||
reader.NodeType == XmlNodeType.EndElement));
continue;
}
else if (reader.IsEmptyElement)
{
// The .Net XmlReader does not return an EndElement event for
// tags with empty content. Therefore, this region of the code is
// slightly different from Java
ReadSifElementFromElementNode(foundDef, reader, dtd, currentElement, formatter,
version, zone);
}
else
{
currentElement =
ReadSifElementFromElementNode(foundDef, reader, dtd, currentElement, formatter,
version, zone);
}
}
break;
case XmlNodeType.Text:
if (currentElement.ElementDef.HasSimpleContent)
{
SetFieldValueFromElement(currentElement.ElementDef, currentElement, reader, version,
formatter, zone);
// The XML Reader cursor is automatically advanced by this method, so we
// need to continue on without calling read()
continue;
}
break;
case XmlNodeType.EndElement:
if (currentElement.Parent != null)
{
currentElement = (SifElement)currentElement.Parent;
while (legacyParse && currentElement.ElementDef.IsCollapsed(version))
{
currentElement = (SifElement)currentElement.Parent;
}
}
if (reader.LocalName == "SIF_Message")
{
// We need to return here. If we let the reader keep reading, and we are reading an embedded
// SIF_Message, it will keep parsing the end tags and not let the stack of SifElement objects
// propertly unwind. We're done anyway.
doneParsing = true;
}
break;
}
// Advance the cursor
reader.Read();
}
if (currentElement == null)
{
return(null);
}
else
{
// Now, unwind and pop off the top element parsed
Element top = currentElement;
Element current;
while ((current = top.Parent) != null)
{
top = current;
}
return((SifElement)top);
}
}
