/// <summary>
/// Generic Deserialize method that will attempt to deserialize any class
/// in the GCheckout.AutoGen namespace.
/// </summary>
/// <param name="Xml">The XML that should be made into an object.</param>
/// <returns>The reconstituted object.</returns>
public static object Deserialize(Stream Xml)
{
long originalPos = Xml.Position;
//Keep the XmlReader from closing the stream on a failure.
StreamWrapper wrap = new StreamWrapper(Xml);
wrap.Position = 0;
try {
//get the name of the node, this is what we will use for the lookup.
string nodeName = GetTopElement(wrap);
string nameSpace = typeof(AutoGen.Hello).Namespace;
Type[] types
= System.Reflection.Assembly.GetExecutingAssembly().GetTypes();
Type reflectedType = GetReflectedType(types, nameSpace, nodeName);
//ok either the type is supported or it is not
//if we could not find the correct type then we must have either
//an incorrect dll for the message, or the message
//is not a Google Checkout message. Return null if the type
//can't be deserialized.
if (reflectedType != null) {
XmlSerializer myDeserializer = new XmlSerializer(reflectedType);
object retVal = myDeserializer.Deserialize(wrap);
wrap.Position = originalPos;
return retVal;
}
else {
System.Diagnostics.Debug.WriteLine("Deserialize was not able" +
"To locate a message of type:" + nodeName + "");
wrap.Position = originalPos;
return null;
}
}
catch (Exception e) {
wrap.Position = 0;
string passedXml;
using (StreamReader reader = new StreamReader(wrap)) {
passedXml = reader.ReadToEnd();
}
bool containsBom = false;
if (wrap != null && wrap.Length >= 3) {
byte[] theBom = Encoding.UTF8.GetPreamble();
wrap.Position = 0;
//try to determine we have a bom in the message,
//which may cause the deserializer to fail.
if (wrap.ReadByte() == theBom[0]
&& wrap.ReadByte() == theBom[1]
&& wrap.ReadByte() == theBom[2]) {
containsBom = true;
}
}
wrap.Position = originalPos;
throw new ApplicationException(
string.Format("Couldn't parse XML: '{0}'; Contains BOM: {1}.",
passedXml, containsBom), e);
}
}
