protected bool LoadChildren()
{
bool success = true;
children.Clear();
foreach (XmlNode currXmlNode in xmlNode.ChildNodes)
{
ScraperNode newScraperNode = ScraperNode.Load(currXmlNode, Context);
if (newScraperNode != null && newScraperNode.LoadSuccess)
{
children.Add(newScraperNode);
}
if (newScraperNode != null && !newScraperNode.LoadSuccess)
{
success = false;
}
}
return(success);
}
public static ScraperNode Load(XmlNode xmlNode, ScriptableScraper context)
{
if (xmlNode == null || xmlNode.NodeType == XmlNodeType.Comment || xmlNode.NodeType == XmlNodeType.CDATA)
{
return(null);
}
Type nodeType = null;
string nodeTypeName = xmlNode.Name;
string nodeTypeKey = "node:" + nodeTypeName;
// try to grab the type from our dictionary
if (TypeCache.ContainsKey(nodeTypeKey))
{
nodeType = TypeCache[nodeTypeKey];
}
// if it's not there, search the assembly for the type
else
{
Type[] typeList = Assembly.GetExecutingAssembly().GetTypes();
foreach (Type currType in typeList)
{
foreach (Attribute currAttr in currType.GetCustomAttributes(true))
{
if (currAttr.GetType() == typeof(ScraperNodeAttribute) &&
nodeTypeName.Equals(((ScraperNodeAttribute)currAttr).NodeName))
{
// store our type and put it in our dictionary so we don't have to
// look it up again
TypeCache[nodeTypeKey] = currType;
nodeType = currType;
break;
}
}
}
}
// if we couldn't find anything log the unhandled node and exit
if (nodeType == null)
{
Logger.Error("ScriptableScraperProvider: Unsupported node type: {0}", xmlNode.OuterXml);
return(null);
}
// try to create a new scraper node object
try
{
ConstructorInfo constructor = nodeType.GetConstructor(new Type[] { typeof(XmlNode), typeof(ScriptableScraper) });
ScraperNode newNode = (ScraperNode)constructor.Invoke(new object[] { xmlNode, context });
return(newNode);
}
catch (Exception e)
{
if (e.GetType() == typeof(ThreadAbortException))
{
throw e;
}
Logger.Error("ScriptableScraperProvider: Error instantiating ScraperNode based on: {0}", xmlNode.OuterXml, e);
return(null);
}
}
