public Action<Message> timeQuery(DBEngine<int, DBElement<int, string>> db)
{
Action<Message> TimeQuery = (msg) =>
{
QueryEngine<int, string> qe = new QueryEngine<int, string>(db);
XDocument doc = XDocument.Parse(msg.content);
string FirstTime = doc.Descendants("Msg").Descendants("Data").Descendants("firstTime").ElementAt(0).Value;
string SecondTime = doc.Descendants("Msg").Descendants("Data").Descendants("secondTime").ElementAt(0).Value;
DateTime firstTime = Convert.ToDateTime(FirstTime);
DateTime secondTime = Convert.ToDateTime(SecondTime);
string name = doc.Descendants("Msg").Descendants("DBName").ElementAt(0).Value;
Func<int, bool> timequery = qe.defineTimeQuery(firstTime, secondTime);
List<int> keys;
StringBuilder result = new StringBuilder(string.Format("<Msg><Reply>timeQuery</Reply><DBName>{0}</DBName><Data>",name));
if (qe.processQuery(timequery, out keys))
{
foreach (var key in keys)
result.Append(string.Format("<key>{0}</key>", key.ToString()));
}
else
result.Append("There is no element written in a specified time-date interval");
result.Append("</Data></Msg>");
msg.content = result.ToString();
Utilities.swapUrls(ref msg);
};
return TimeQuery;
}
public Action<Message> specPatternQuery(DBEngine<int, DBElement<int, string>> db)
{
Action<Message> SpecPatternQuery = (msg) =>
{
QueryEngine<int, string> qe = new QueryEngine<int, string>(db);
XDocument doc = XDocument.Parse(msg.content);
Func<int, bool> f = qe.defineSpecPatternQuery();
string name=doc.Descendants("Msg").Descendants("DBName").ElementAt(0).Value;
List<int> keys;
StringBuilder result = new StringBuilder(string.Format("<Msg><Reply>specPatternQuery</Reply><DBName>{0}</DBName><Data>",name));
if (qe.processQuery(f, out keys))
{
foreach (var key in keys)
result.Append(string.Format("<key>{0}</key>", key.ToString()));
}
else
result.Append("There is no key that matching a specified pattern");
result.Append("</Data></Msg>");
msg.content = result.ToString();
Utilities.swapUrls(ref msg);
};
return SpecPatternQuery;
}