public static void WithSubmit(Action <MusicDataContext> op)
{
using (var db = new MusicDataContext()) {
op(db);
db.SubmitChanges();
}
}
public override Task AddPlayCount(string songPath)
{
return(TaskEx.Run(() => {
MusicDataContext.WithSubmit(db => {
var currentEntry = from PlayFrequency playFreq in db.PlayFrequencies
where playFreq.SongPath == songPath
select playFreq;
if (currentEntry.Any())
{
// if the entry already exists
foreach (PlayFrequency pf in currentEntry)
{
pf.PlayCount = pf.PlayCount + 1;
}
}
else
{
// if it doesn't exist
var newEntry = new PlayFrequency()
{
SongPath = songPath, PlayCount = 1
};
db.PlayFrequencies.InsertOnSubmit(newEntry);
}
});
}));
}
private static void Add(MusicDataContext db, PlaylistTrack track)
{
Add(db, new List <PlaylistTrack>()
{
track
});
}
public static PlaylistInfo TracksAndIndex()
{
return(MusicDataContext.WithConnection <PlaylistInfo>(db => {
var tracks = Tracks(db);
return new PlaylistInfo(tracks, Index(db));
}));
}
public static void SetPlaylist(PlaylistTrack track)
{
MusicDataContext.WithSubmit(db => {
Clear(db);
Add(db, track);
SetIndex(db, 0);
});
}
public static T WithSubmit <T>(Func <MusicDataContext, T> op)
{
using (var db = new MusicDataContext()) {
var ret = op(db);
db.SubmitChanges();
return(ret);
}
}
public static ObservableCollection <PlayFrequency> MostPlayed(int count = 100)
{
return(MusicDataContext.WithConnection(db => {
var mostPlayed = (from PlayFrequency playFreq in db.PlayFrequencies
orderby playFreq.PlayCount descending
select playFreq).Take(count);
return new ObservableCollection <PlayFrequency>(mostPlayed);
}));
}
public static void CreateIfNotExists()
{
// Creates the database if it does not yet exist.
using (var db = new MusicDataContext()) {
if (db.DatabaseExists() == false)
{
db.CreateDatabase();
}
}
}
public override Task <List <string> > LeastPlayed(int count = 20)
{
return(TaskEx.Run(() => {
return MusicDataContext.WithConnection(db => {
var leastPlayed = (from PlayFrequency playFreq in db.PlayFrequencies
orderby playFreq.PlayCount ascending
select playFreq.SongPath).Take(count);
return new List <string>(leastPlayed);
});
}));
}
/// <summary>
/// http://stackoverflow.com/questions/2801500/linq-display-row-numbers
/// </summary>
/// <param name="index"></param>
public static void Delete(int index)
{
MusicDataContext.WithSubmit(db => {
var songs = (from PlaylistItem song in db.Playlist orderby song.ItemId select song)
.AsEnumerable();
if (songs != null && songs.Count() > index)
{
var song = songs.ElementAt(index);
db.Playlist.DeleteOnSubmit(song);
}
});
}
private static int Index(MusicDataContext db)
{
var entry = (from PlaylistIndex i in db.PlayIndex select i).SingleOrDefault();
if (entry != null)
{
return(entry.Index);
}
else
{
return(-1);
}
}
public override Task DeleteSongEntry(string songPath)
{
return(TaskEx.Run(() => {
MusicDataContext.WithSubmit(db => {
var entry = from PlayFrequency playFreq in db.PlayFrequencies
where playFreq.SongPath == songPath
select playFreq;
foreach (PlayFrequency pf in entry)
{
db.PlayFrequencies.DeleteOnSubmit(pf);
}
});
}));
}
private static List <PlaylistTrack> Tracks(MusicDataContext db)
{
var allSongs = from PlaylistItem song in db.Playlist orderby song.ItemId select song;
if (allSongs.Any())
{
// throws OOM upon "next track" following eom
return(new List <PlaylistTrack>(allSongs.Select(item2track)));
}
else
{
return(new List <PlaylistTrack>());
}
}
public static PlaylistTrack Previous()
{
return(MusicDataContext.WithSubmit(db => {
var index = Index(db);
var tracks = Tracks(db);
if (index > 0 && tracks.Count > --index)
{
var track = tracks[index];
SetIndex(db, index);
return track;
}
else
{
return null;
}
}));
}
private static void SetIndex(MusicDataContext db, int newIndex)
{
var entry = (from PlaylistIndex i in db.PlayIndex select i);
if (entry.Any())
{
foreach (PlaylistIndex pi in entry)
{
pi.Index = newIndex;
}
}
else
{
var newEntry = new PlaylistIndex()
{
Index = newIndex
};
db.PlayIndex.InsertOnSubmit(newEntry);
}
}
public static T WithConnection <T>(Func <MusicDataContext, T> op)
{
using (var db = new MusicDataContext()) {
return(op(db));
}
}
public static List <PlaylistTrack> Tracks()
{
return(MusicDataContext.WithConnection <List <PlaylistTrack> >(db => {
return Tracks(db);
}));
}
private static void Clear(MusicDataContext db)
{
var allSongs = from PlaylistItem song in db.Playlist select song;
db.Playlist.DeleteAllOnSubmit(allSongs);
}
public static void AddAll(IEnumerable <PlaylistTrack> tracks)
{
MusicDataContext.WithSubmit(db => {
Add(db, tracks);
});
}
private static void Add(MusicDataContext db, IEnumerable <PlaylistTrack> tracks)
{
var entries = tracks.Select(track2item);
db.Playlist.InsertAllOnSubmit(entries);
}
public static void Clear()
{
MusicDataContext.WithSubmit(db => {
Clear(db);
});
}
public static int Index()
{
return(MusicDataContext.WithConnection <int>(db => {
return Index(db);
}));
}
public static void SetIndex(int newIndex)
{
MusicDataContext.WithSubmit(db => {
SetIndex(db, newIndex);
});
}
