/// <summary>
/// Queries the inverted index
/// </summary>
/// <returns>Returns the document ids that meets the query</returns>
public SortedSet <int> QueryString()
{
//Handles one word and free text query.
List <SortedSet <int> > eachWordsDocIds = new List <SortedSet <int> >();
SortedSet <int> result = new SortedSet <int>();
var wordsInQuery = EachTermSearched();
//separate each word in the query
for (int index = 0; index < wordsInQuery.Length; index++)
{
eachWordsDocIds.Add(new SortedSet <int>());
var term = wordsInQuery[index];
if (invertedIndex.ContainTerm(term)) //if the term is present in the invertedIndex
{
foreach (var tuple in invertedIndex[term])
{
eachWordsDocIds[index].Add(tuple.DocumentId);
//get the docIds of in the postings list of the term
}
}
result.UnionWith(eachWordsDocIds[index]); //Union the idList of each term with the final result.
}
return(result);
}
