/// Executes the query.
// Preprocesses the query text entered by the user
// and queries the index.
// Calculates the total time to run the query
// and sets some text variables for later use.
public int RunQuery(string text, bool preproc, out string qText)
{
// start timer...
DateTime start = DateTime.Now;
// get the query settings from the collection
IRQueryParams queryParams = myCollection.GetQueryParams();
string[] queryFields = queryParams.Fields;
float[] queryFieldBoosts = queryParams.FieldBoosts;
// build field boost dictionary
IDictionary <string, float> boosts = new Dictionary <string, float>();
for (int i = 0; i < queryFields.Length; i++)
{
boosts.Add(queryFields[i], queryFieldBoosts[i]);
}
// setup searcher, query and parser
CreateSearcher();
Query query;
parser = new MultiFieldQueryParser(Lucene.Net.Util.Version.LUCENE_30,
queryFields, analyzer, boosts);
// preprocess query (if required)
if (preproc == true)
{
query = PreprocessQuery(text, parser);
}
else
{
// no preprocessing
query = parser.Parse(text);
}
// print query text to form
qText = query.ToString();
// execute the search
searchResults = searcher.Search(query, maxResults);
// end timer and calculate total time
DateTime end = DateTime.Now;
TimeSpan duration = end - start;
queryTime = duration.Seconds + (float)duration.Milliseconds / 1000;
CleanUpSearcher();
return(searchResults.TotalHits);
}
// set the query parameters for this IRDocument type
public override IRQueryParams GetQueryParams()
{
string[] fields = { "title", "words" };
float[] fieldBoost = { 1.0f, 1.0f };
bool removeStopWords = false;
int nGrams = 3;
float nGramBoost = 0.2f;
bool addSynonyms = false;
float synonymBoost = 0.5f;
IRQueryParams querySettings = new IRQueryParams(fields, fieldBoost,
removeStopWords,
nGrams, nGramBoost,
addSynonyms, synonymBoost);
return(querySettings);
}