///<summary>
/// Extract location ParsedURL parameters into a HashMap.
/// Let ParamOps operate on this Map.
/// Derive a new ParsedURL using the base of the original location's ParsedURL and the transformed parameter map.
/// If the new ParsedURL is different than the old one, make the old one an additional location for this,
/// and add the transformed ParsedURL to the DocumentLocationMap.
/// <p/>
/// If the location changes, then reconnect to the new one.
///</summary>
public override Object Perform(Object obj) // throws IOException
{
bool usingThisDoc = true; // if we are changing this document's location, or its child field's location
Document document = (Document)SemanticOperationHandler.SemanticOperationVariableMap.Get(SemanticOperationKeyWords.Metadata);
if (ObjectStr != null)
{
Object o = SemanticOperationHandler.SemanticOperationVariableMap.Get(ObjectStr);
if (o != null && o is Document)
{
document = (Document)o;
usingThisDoc = false;
}
}
ParsedUri origLocation = document.Location.value;
if (origLocation.IsFile)
{
Debug.WriteLine("Not doing <filter_location> because this is a file: " + origLocation);
return(null);
}
SemanticsGlobalCollection <Document> globalCollection = SemanticOperationHandler.SemanticsScope.GlobalDocumentCollection;
bool locationChanged = false;
if (paramOps != null && paramOps.Count > 0)
{
Dictionary <String, String> parametersMap = new Dictionary <string, string>();
foreach (String param in origLocation.Query.Split('&'))
{
parametersMap.Add(param.Split('=')[0], param.Split('=')[1]);
}
if (parametersMap.Count == 0)
{
parametersMap = new Dictionary <string, string>(paramOps.Count);
}
foreach (ParamOp paramOp in paramOps)
{
paramOp.SemanticHandler = SemanticOperationHandler;
paramOp.TransformParams(parametersMap);
}
String str = origLocation.AbsolutePath + "?";
foreach (KeyValuePair <string, string> pair in parametersMap)
{
str += pair.Key + "=" + pair.Value + "&";
}
if (str[str.Length - 1] == '&')
{
str = str.Substring(0, str.Length - 1);
}
ParsedUri transformedLocation = new ParsedUri(str);
if (origLocation != transformedLocation)
{
document.Location.Value = transformedLocation;
locationChanged = true;
}
}
if (alternativeHosts != null)
{
String origHost = origLocation.Host;
foreach (String alternativeHost in alternativeHosts)
{
if (!origHost.Equals(alternativeHost))
{
ParsedUri newLocation = new ParsedUri(origLocation.AbsoluteUri.Replace(origLocation.Host, alternativeHost));
document.AddAdditionalLocation(new MetadataParsedURL(newLocation));
globalCollection.AddDocument(document, newLocation);
}
}
}
if (regex != null)
{
ParsedUri location = document.Location.Value;
ParsedUri regexURL = regex.Perform(location);
document.ChangeLocation(regexURL);
locationChanged = true;
}
if (stripPrefix != null)
{
String origlLocationString = origLocation.ToString();
int index = origlLocationString.IndexOf(stripPrefix);
if (index > 6)
{
String newLocationString = origlLocationString.Substring(0, index);
ParsedUri newLocation = new ParsedUri(newLocationString);
if (newLocation != null)
{
document.ChangeLocation(newLocation);
}
}
}
if (locationChanged && usingThisDoc) // if we are just changing the location of a field, we don't have to reconnect.
{
if (documentParser != null)
{
//documentParser.reConnect(); // changed the location, so we better connect again!
}
else
{
//imageClosure.RequestMetadata();
}
}
return(null);
}
