/// <summary>
/// Returns postings for a query
/// </summary>
/// <param name="query">the query which the user is making to the search engine</param>
public List <string> SearchQuery(string query)
{
try
{
//the list of strings to return
List <String> results = new List <string>();
if (mode == false)
{
Console.WriteLine("In Ranked Retrieval");
Console.WriteLine("Query:" + query);
//parser to parse the query
RankedRetrievalParser parser = new RankedRetrievalParser();
List <string> finalTerms = parser.ParseQuery(query);
//retrieves the top ten documents of the normalized tokens
RankedRetrieval rv = new RankedRetrieval(corpus, index, RankedRetrievalMode);
IList <MaxPriorityQueue.InvertedIndex> topTenDocs = rv.GetTopTen(finalTerms);
//parse the query
List <string> terms = parser.ParseQuery(query);
if (topTenDocs.Count > 0)
{
//add the count of the postings to the list of strings to be returned
results.Add(topTenDocs.Count.ToString());
//for each posting...
int numberRank = 1;
foreach (MaxPriorityQueue.InvertedIndex p in topTenDocs)
{
//use the document id to access the document
IDocument doc = corpus.GetDocument(p.GetDocumentId());
//add the title to the list of strings to be returned
results.Add("#" + numberRank + ": (" + Math.Round(p.GetRank(), 5).ToString() + ") " + doc.Title);
//add the document id to the list of strings to be returned
results.Add(doc.DocumentId.ToString());
Console.WriteLine(p.GetDocumentId() + "" + doc.Title);
numberRank++;
}
}
return(results);
}
// end of ranked retrieval segment (if statement)
else
{
Console.WriteLine(query);
//the list of postings
IList <Posting> postings;
IQueryComponent component;
//create a stemming token processor
ITokenProcessor processor = new StemmingTokenProcesor();
//create a boolean query parser
BooleanQueryParser parser = new BooleanQueryParser();
//parse the query
component = parser.ParseQuery(query);
//get the postings
postings = component.GetPostings(index, processor);
//if there are any postings...
if (postings.Count > 0)
{
//add the count of the postings to the list of strings to be returned
results.Add(postings.Count.ToString());
//for each posting...
foreach (Posting p in postings)
{
//use the document id to access the document
IDocument doc = corpus.GetDocument(p.DocumentId);
//add the title to the list of strings to be returned
results.Add(doc.Title);
//add the document id to the list of strings to be returned
results.Add(doc.DocumentId.ToString());
}
Console.WriteLine(results.Count);
}
//if there aren't any postings...
else
{
//add a zero to the list of strings to be returned
results.Add("0");
}
//return the list of strings
return(results);
}
}
catch (Exception e)
{
return(new List <string>());
}
// Console.Write("Corpus size is:");
// Console.WriteLine(corpus.CorpusSize);
}
public void ParsingSingleQueryTest_ReturnsTermLiteral()
{
//Arrange
string query = "smoothie";
TermLiteral expected = new TermLiteral(query);
//Act
IQueryComponent actual = parser.ParseQuery(query);
//Assert
actual.Should().BeOfType(typeof(TermLiteral));
((TermLiteral)actual).Term.Should().BeSameAs(expected.Term);
}