public TweetFilter(string config_file)
{
if (!System.IO.File.Exists(config_file))
{
ft = new FilterApp();
return;
}
XmlDocument cfg = new XmlDocument();
cfg.Load(config_file);
XmlNode ft_xml = cfg.GetElementsByTagName("Filter")[0];
if (ft_xml == null)
{
throw new Exception("Failed in config: not valid config");
}
ft = parse_xml(ft_xml);
loaded = true;
}
private FilterApp parse_xml(XmlNode ft)
{
if (ft.Attributes?["operation"] != null)
{
FilterOp op;
switch (ft.Attributes["operation"].Value)
{
case "or":
op = FilterOp.OP_OR;
break;
case "and":
op = FilterOp.OP_AND;
break;
case "xor":
op = FilterOp.OP_XOR;
break;
default:
throw new Exception("Failed in config: no such operation");
}
if (ft.ChildNodes.Count < 2)
{
throw new Exception("Failed in config: wrong parity");
}
else if (op == FilterOp.OP_XOR && ft.ChildNodes.Count > 2)
{
throw new Exception("Failed in config: xor operation is binary operation");
}
else
{
FilterApp f1 = parse_xml(ft.ChildNodes[0]);
FilterApp f2 = parse_xml(ft.ChildNodes[1]);
FilterApp f = new FilterApp(f1, f2, op);
for (int i = 2; i < ft.ChildNodes.Count; i++)
{
f = new FilterApp(f, parse_xml(ft.ChildNodes[i]), op);
}
return(f);
}
}
else
{
if (ft["Type"] == null || ft["Value"] == null)
{
throw new Exception("Failed in config: terminal filter is not valid");
}
FilterApp f = null;
if (ft["Type"].InnerText == "body")
{
f = new FilterApp(new Filter(FilterType.VAL_BODY, ft["Value"].InnerText));
}
else if (ft["Type"].InnerText == "retweet")
{
if (!int.TryParse(ft["Value"].InnerText, out int x))
{
throw new Exception("Failed in config: retweet filter must have integer threshold");
}
f = new FilterApp(new Filter(FilterType.VAL_RETWEET, x));
}
else if (ft["Type"].InnerText == "like")
{
if (!int.TryParse(ft["Value"].InnerText, out int x))
{
throw new Exception("Failed in config: like filter must have integer threshold");
}
f = new FilterApp(new Filter(FilterType.VAL_LIKE, x));
}
return(f);
}
}
public FilterApp(FilterApp lft, FilterApp rft, FilterOp fop)
{
m_filter = new Tuple <FilterApp, FilterApp, FilterOp>(lft, rft, fop);
multi = true;
}