public ThingBase DeserializeItem(XPathNavigator thingNav)
{
ThingBase result;
Guid typeId = new Guid(thingNav.SelectSingleNode("type-id").Value);
Type handler = null;
if (typeId == _applicationSpecificTypeId)
{
// Handle application specific health item records by checking for handlers
// for the application ID and subtype tag. If the handler doesn't exist
// the default handler will be picked up below.
AppDataKey appDataKey = GetAppDataKey(thingNav);
if (appDataKey != null)
{
var appSpecificHandlers = _thingTypeRegistrar.RegisteredAppSpecificHandlers;
if (appSpecificHandlers.ContainsKey(appDataKey.AppId))
{
if (appSpecificHandlers[appDataKey.AppId].ContainsKey(appDataKey.SubtypeTag))
{
handler = appSpecificHandlers[appDataKey.AppId][appDataKey.SubtypeTag];
}
}
}
}
if (handler == null && _typeHandlers.ContainsKey(typeId))
{
handler = _typeHandlers[typeId];
}
if (handler != null)
{
result = (ThingBase)Activator.CreateInstance(handler);
}
else
{
result = new ThingBase(typeId);
}
result.ParseXml(thingNav, thingNav.OuterXml);
return(result);
}
private AppDataKey GetAppDataKey(XPathNavigator thingNav)
{
AppDataKey result = null;
XPathNavigator appIdNav =
thingNav.SelectSingleNode("data-xml/app-specific/format-appid");
XPathNavigator subtypeNav =
thingNav.SelectSingleNode("data-xml/app-specific/format-tag");
if (appIdNav != null && subtypeNav != null)
{
result = new AppDataKey
{
AppId = appIdNav.Value,
SubtypeTag = subtypeNav.Value
};
}
return(result);
}
private static AppDataKey GetAppDataKey(XPathNavigator thingNav)
{
AppDataKey result = null;
XPathNavigator appIdNav =
thingNav.SelectSingleNode("data-xml/app-specific/format-appid");
XPathNavigator subtypeNav =
thingNav.SelectSingleNode("data-xml/app-specific/format-tag");
if (appIdNav != null && subtypeNav != null)
{
result = new AppDataKey();
result.AppId = appIdNav.Value;
result.SubtypeTag = subtypeNav.Value;
}
return result;
}
