public ActionResult Index(string q, string city, string lat, string @long, string miles, string count)
{
IList<SelectListItem> listOfMiles = new List<SelectListItem>
{
new SelectListItem {Text = "50", Value = "50"},
new SelectListItem {Text = "100", Value = "100"}
};
IList<SelectListItem> listOfCounts = new List<SelectListItem>
{
new SelectListItem {Text = "10", Value = "10"},
new SelectListItem {Text = "50", Value = "50"},
new SelectListItem {Text = "100", Value = "100"}
};
ViewData["Miles"] = listOfMiles;
ViewData["Counts"] = listOfCounts;
var indexViewModel = new IndexViewModel
{
q = q,
lat = lat,
@long = @long
};
var analyzer = new StandardAnalyzer(_luceneVersion);
Query query;
if (string.IsNullOrEmpty(q))
{
query = new MatchAllDocsQuery();
}
else
{
var multiFieldQueryParser = new MultiFieldQueryParser(_luceneVersion, _searchFields, analyzer);
query = multiFieldQueryParser.Parse(q);
}
// create a distance query
// https://svn.apache.org/repos/asf/incubator/lucene.net/trunk/test/contrib/Spatial/TestCartesian.cs
double milesDouble = 100.0;
int countInt = 50;
double latitudeDouble;
double longitudeDouble;
if (!String.IsNullOrEmpty(miles))
{
Double.TryParse(miles, out milesDouble);
}
if (!String.IsNullOrEmpty(count))
{
int.TryParse(count, out countInt);
}
Double.TryParse(lat, out latitudeDouble);
Double.TryParse(@long, out longitudeDouble);
var distanceQuery = new DistanceQueryBuilder(latitudeDouble, longitudeDouble, milesDouble, LuceneIndexFieldMap.LatitudeField, LuceneIndexFieldMap.LongitudeField, CartesianTierPlotter.DefaltFieldPrefix, true);
var dsort = new DistanceFieldComparatorSource(distanceQuery.DistanceFilter);
var sort = new Sort(new SortField("foo", dsort, false));
var startTime = DateTime.Now;
var distanceHelper = new DistanceHelper();
// search for documents
{
TopDocs topDocs = _indexSearcher.Search(query, distanceQuery.Filter, countInt, sort);
indexViewModel.TotalHits = topDocs.TotalHits;
foreach (ScoreDoc match in topDocs.ScoreDocs)
{
Document doc = _indexSearcher.Doc(match.doc);
double prefixCodedToDouble = NumericUtils.PrefixCodedToDouble(doc.Get(LuceneIndexFieldMap.LatitudeField));
double codedToDouble = NumericUtils.PrefixCodedToDouble(doc.Get(LuceneIndexFieldMap.LongitudeField));
double distanceInKilometres = distanceHelper.DistanceInKilometres(latitudeDouble, longitudeDouble,
prefixCodedToDouble, codedToDouble);
var geo = new GeoName
{
Name = doc.Get(LuceneIndexFieldMap.FirstNameField),
Asciiname = doc.Get(LuceneIndexFieldMap.CityField),
FeatureClass = doc.Get(LuceneIndexFieldMap.FeatureClassField),
FeatureCode = doc.Get(LuceneIndexFieldMap.FeatureCodeField),
Latitude = prefixCodedToDouble,
Longitude = codedToDouble,
Timezone = doc.Get(LuceneIndexFieldMap.TimeZoneField),
DistanceInKm = distanceInKilometres
};
indexViewModel.SearchResults.Add(geo);
}
}
indexViewModel.SearchTimeMs = DateTime.Now.Subtract(startTime).TotalMilliseconds;
return View(indexViewModel);
}
private IList<GeoName> GetDestinations(string countryCode)
{
IList<GeoName> names = new List<GeoName>();
//http://download.geonames.org/export/dump/
HttpContext context = HttpContext.Current;
string filePath = context.Server.MapPath(String.Format("~/App_Data/{0}.txt", countryCode));
using (TextReader tr = File.OpenText(filePath))
{
string line;
while ((line = tr.ReadLine()) != null)
{
string[] columns = line.Split('\t');
/*
The main 'geoname' table has the following fields :
---------------------------------------------------
0 geonameid : integer id of record in geonames database
1 - name : name of geographical point (utf8) varchar(200)
2 - asciiname : name of geographical point in plain ascii characters, varchar(200)
3 - alternatenames : alternatenames, comma separated varchar(5000)
4 - latitude : latitude in decimal degrees (wgs84)
5 - longitude : longitude in decimal degrees (wgs84)
6 - feature class : see http://www.geonames.org/export/codes.html, char(1)
7 - feature code : see http://www.geonames.org/export/codes.html, varchar(10)
8 - country code : ISO-3166 2-letter country code, 2 characters
9 - cc2 : alternate country codes, comma separated, ISO-3166 2-letter country code, 60 characters
10 - admin1 code : fipscode (subject to change to iso code), see exceptions below, see file admin1Codes.txt for display names of this code; varchar(20)
11 - admin2 code : code for the second administrative division, a county in the US, see file admin2Codes.txt; varchar(80)
12 - admin3 code : code for third level administrative division, varchar(20)
13 - admin4 code : code for fourth level administrative division, varchar(20)
14 - population : bigint (8 byte int)
15 - elevation : in meters, integer
16 - gtopo30 : average elevation of 30''x30'' (ca 900mx900m) area in meters, integer
17 - timezone : the timezone id (see file timeZone.txt)
18 - modification date : date of last modification in yyyy-MM-dd format
*/
var geoName = new GeoName
{
Asciiname = columns[2].Trim(),
FeatureClass = columns[6].Trim(),
FeatureCode = columns[7].Trim(),
Timezone = columns[17].Trim()
};
double latitude;
if (Double.TryParse(columns[4], out latitude))
{
geoName.Latitude = latitude;
}
double longitude;
if (Double.TryParse(columns[5], out longitude))
{
geoName.Longitude = longitude;
}
names.Add(geoName);
}
tr.Close();
}
return names;
}
