private TasteRecommend GetRecommendationBaseOnInitialSelection(string userId, string initialType)
{
switch (initialType)
{
case "genre":
try
{
var genreRecommendations = new TasteRecommend();
var genrePoints = this.cassandraConnector.getMapper()
.SingleOrDefault <InitProfileGenre>("WHERE uid = ?", userId)
.profile
.ToArray();
var firstGenreIndex = 0;
for (int i = 0; i < genrePoints.Length; i++)
{
if (genrePoints[i] > 0)
{
firstGenreIndex = i;
break;
}
}
var firstGenre = this.cassandraConnector.getMapper()
.SingleOrDefault <Genre>("WHERE idx=?", firstGenreIndex)
.name;
genreRecommendations.uid = userId;
genreRecommendations.recommendType = initialType;
genreRecommendations.recommendations = this.cassandraConnector.getMapper()
.Fetch <Song>("WHERE genre=? LIMIT ?", firstGenre, 10)
.ToList();
return(genreRecommendations);
}
catch (System.Exception)
{
return(null);
}
case "artist":
try
{
var artistRecommendations = new TasteRecommend();
var artistPoints = this.cassandraConnector.getMapper()
.SingleOrDefault <InitProfileArtist>("WHERE uid = ?", userId)
.profile
.ToArray();
var firstArtistIndex = 0;
for (int i = 0; i < artistPoints.Length; i++)
{
if (artistPoints[i] > 0)
{
firstArtistIndex = i;
break;
}
}
var firstArtist = this.cassandraConnector.getMapper()
.SingleOrDefault <Artist>("WHERE idx=?", firstArtistIndex)
.name;
artistRecommendations.uid = userId;
artistRecommendations.recommendType = initialType;
artistRecommendations.recommendations = this.cassandraConnector.getMapper()
.Fetch <Song>("WHERE artist=? LIMIT ?", firstArtist, 10)
.ToList();
return(artistRecommendations);
}
catch (System.Exception)
{
return(null);
}
case "composer":
try
{
var composerRecommendations = new TasteRecommend();
var composerPoints = this.cassandraConnector.getMapper()
.SingleOrDefault <InitProfileComposer>("WHERE uid = ?", userId)
.profile
.ToArray();
var firstComposerIndex = 0;
for (int i = 0; i < composerPoints.Length; i++)
{
if (composerPoints[i] > 0)
{
firstComposerIndex = i;
break;
}
}
var firstComposer = this.cassandraConnector.getMapper()
.SingleOrDefault <Composer>("WHERE idx=?", firstComposerIndex)
.name;
composerRecommendations.uid = userId;
composerRecommendations.recommendType = initialType;
composerRecommendations.recommendations = this.cassandraConnector.getMapper()
.Fetch <Song>("WHERE composer=? LIMIT ?", firstComposer, 10)
.ToList();
return(composerRecommendations);
}
catch (System.Exception)
{
return(null);
}
default:
return(null);
}
}
private TasteRecommend GetRecommendationsBaseOnTaste(string userId, string tasteType, int numberOfRecommendationPerEvent)
{
List <string> songIds = new List <string>();
switch (tasteType)
{
case "genre":
try
{
var genreRecommendations = new TasteRecommend();
songIds = this.cassandraConnector.getMapper()
.SingleOrDefault <RecommendationByGenre>("WHERE uid = ?", userId)
.recommendations;
genreRecommendations.uid = userId;
genreRecommendations.recommendType = tasteType;
genreRecommendations.recommendations = this.cassandraConnector.getMapper()
.Fetch <Song>("WHERE sid IN ? LIMIT ?", songIds, numberOfRecommendationPerEvent)
.ToList();
return(genreRecommendations);
}
catch (System.Exception)
{
return(null);
}
case "artist":
try
{
var artistRecommendations = new TasteRecommend();
songIds = this.cassandraConnector.getMapper()
.SingleOrDefault <RecommendationByArtist>("WHERE uid = ?", userId)
.recommendations;
artistRecommendations.uid = userId;
artistRecommendations.recommendType = tasteType;
artistRecommendations.recommendations = this.cassandraConnector.getMapper()
.Fetch <Song>("WHERE sid IN ? LIMIT ?", songIds, numberOfRecommendationPerEvent)
.ToList();
return(artistRecommendations);
}
catch (System.Exception)
{
return(null);
}
case "composer":
try
{
var composerRecommendations = new TasteRecommend();
songIds = this.cassandraConnector.getMapper()
.SingleOrDefault <RecommendationByComposer>("WHERE uid = ?", userId)
.recommendations;
composerRecommendations.uid = userId;
composerRecommendations.recommendType = tasteType;
composerRecommendations.recommendations = this.cassandraConnector.getMapper()
.Fetch <Song>("WHERE sid IN ? LIMIT ?", songIds, numberOfRecommendationPerEvent)
.ToList();
return(composerRecommendations);
}
catch (System.Exception)
{
return(null);
}
default:
return(null);
}
}
