public static List <SkybotObject> GetObjects(EquatorialPoint Location, double Radius, DateTime Time)
{
/* Prepares the query */
string url = GenerateSCSUrl(Location, Radius, Time);
string result = string.Empty;
/* Tries querying the SkyBoT server, returining nothing if it fails. */
try
{
result = (new WebClient()).DownloadString(url);
}
catch
{
return(new List <SkybotObject>());
}
/* Parsing Skybot output: specific selection of vot:TABLEDATA and namespace cleanup */
int sel1 = result.IndexOf("<vot:TABLEDATA>", StringComparison.InvariantCulture);
if (sel1 == -1)
{
return(new List <SkybotObject>());
}
string data = result.Substring(sel1);
int sel2 = data.IndexOf("</vot:TABLEDATA>", StringComparison.InvariantCulture);
data = data.Substring(0, sel2 + 16);
data = data.Replace("vot:", "");
/* Parsing xml output */
XDocument xdoc = XDocument.Parse(data);
List <SkybotObject> objs = new List <SkybotObject>();
XElement key = xdoc.Elements().ToArray()[0];
foreach (XElement xe in key.Elements())
{
var z = xe.Elements().ToArray();
string permdes = z[0].Value;
string name = z[1].Value;
string ra = z[2].Value;
string dec = z[3].Value;
string cls = z[4].Value;
int? pd = int.TryParse(permdes, out int pdi) ? (int?)pdi : null;
SkybotObject oj = new SkybotObject(name, ra + " " + dec, Time, pd, cls, 0, 0);
objs.Add(oj);
}
return(objs);
}
/// <summary>
/// Retrieves the list of objects from the given url.
/// </summary>
/// <remarks>
/// If the function returned false, but the object list is non-null, then requried fields in the VOTable were missing.
/// </remarks>
/// <returns><c>true</c>, if succeded in obtaining, <c>false</c> otherwise.</returns>
/// <param name="Url">The URL from which to retrieve objects.</param>
/// <param name="Time">Time corresponding to the given URL.</param>
/// <param name="Objects">The resulting list of objects.</param>
public static bool GetObjects(string Url, DateTime Time, out List <SkybotObject> Objects)
{
string result = string.Empty;
/* Tries querying the SkyBoT server, returining false if it fails. */
using (WebClient client = new WebClient())
try
{ client.Proxy = null; result = client.DownloadString(Url); }
catch
{ Objects = null; return(false); }
XmlNamespaceManager xmgr = new XmlNamespaceManager(new NameTable());
xmgr.AddNamespace("vot", VOTxmlns);
XDocument Doc = XDocument.Parse(result);
XElement Root = Doc.Root;
/* Parse column headers */
var Columns = Root.XPathSelectElements("/vot:VOTABLE/vot:RESOURCE/vot:TABLE/vot:FIELD", xmgr);
Dictionary <string, int> Cset = new Dictionary <string, int>();
int csn = 0;
foreach (var clmn in Columns)
{
Cset.Add(clmn.Attribute("name").Value, csn++);
}
/* Parse table */
var Rows = Root.XPathSelectElements("/vot:VOTABLE/vot:RESOURCE/vot:TABLE/vot:DATA/vot:TABLEDATA/vot:TR", xmgr);
Objects = new List <SkybotObject>();
foreach (var Row in Rows)
{
List <string> Values = Row.Elements().Select((x) => x.Value).ToList();
try
{
int?pd = int.TryParse(Values[Cset["Num"]], out int pdi) ? (int?)pdi : null;
double.TryParse(Values[Cset["Mv"]], out double magV);
double.TryParse(Values[Cset["ErrPos"]], out double ErrPos);
SkybotObject sko = new SkybotObject(Values[Cset["Name"]], Values[Cset["RA"]] + " " + Values[Cset["DEC"]], Time, pd, Values[Cset["Class"]], magV, ErrPos);
Objects.Add(sko);
}
catch (KeyNotFoundException) { return(false); }
}
return(true);
}
