private void RemovePlaylistItemsInternal(DatabasePlaylist list)
{
foreach (var info in list.InfoItems)
{
resourcesDatabase.RemoveListFromItem(list, info);
}
}
public void UpdateIndex(DatabasePlaylist list, int offset)
{
if (!ContainingListInstances.ContainsKey(list))
{
throw new ArgumentException();
}
ContainingListInstances[list] = offset;
}
public bool TryAdd(DatabasePlaylist list, int offset)
{
if (ContainingListInstances.ContainsKey(list))
{
return(false);
}
ContainingListInstances.Add(list, offset);
return(true);
}
// Returns the index of the resource in the list
// O(log d)
private bool TryGetIndexOfInternal(DatabasePlaylist playlist, AudioResource resource, out int index)
{
if (resourcesDatabase.TryGet(resource, out var info) && info.TryGetIndexIn(playlist, out index))
{
return(true);
}
index = 0;
return(false);
}
// Moves and updates the moved items' index, ignores values at target
// O(n)
private static int MoveBackwards(DatabasePlaylist playlist, List <UniqueResourceInfo> items, int begin, int end, int targetEnd)
{
while (begin != end)
{
var item = items[--targetEnd] = items[--end];
item.UpdateIndex(playlist, targetEnd);
}
return(targetEnd);
}
private bool TryGetInternal(string id, out DatabasePlaylist value)
{
if (playlistCache.TryGetValue(id, out var data))
{
value = data;
return(true);
}
value = null;
return(false);
}
public bool GetOrCreateForListItem(AudioResource resource, DatabasePlaylist list, int index, out UniqueResourceInfo info)
{
if (uniqueSongs.TryGetValue(resource, out info))
{
return(info.TryAdd(list, index));
}
info = new UniqueResourceInfo(resource);
info.TryAdd(list, index);
uniqueSongs.Add(resource, info);
return(true);
}
// Moves and updates the moved items' index, ignores values at target
// O(n)
private static int Move(DatabasePlaylist playlist, List <UniqueResourceInfo> items, int begin, int end, int target)
{
while (begin != end)
{
var item = items[target] = items[begin];
item.UpdateIndex(playlist, target);
target++;
begin++;
}
return(target);
}
public void RemoveListFromItem(DatabasePlaylist list, UniqueResourceInfo info)
{
if (!info.RemoveList(list))
{
Log.Warn("Failed to remove song from database");
}
if (!info.IsContainedInAList)
{
uniqueSongs.Remove(info.Resource);
}
}
public bool CreatePlaylist(string listId, Uid owner)
{
lock (Lock) {
var list = new DatabasePlaylist(listId, owner);
if (io.TryGetRealId(listId, out _))
{
return(false);
}
playlistCache.Add(listId, list);
io.Write(listId, list);
return(true);
}
}
private void AddPlaylistInternal(string id, IPlaylist list)
{
var items = new List <UniqueResourceInfo>(list.Count);
var plist = new DatabasePlaylist(id, list.Owner, list.AdditionalEditors, items);
for (var index = 0; index < list.Count; index++)
{
var item = list[index];
if (resourcesDatabase.GetOrCreateForListItem(item, plist, index, out var info))
{
items.Add(info);
}
else
{
Log.Info($"Song {item.ResourceTitle} in playlist {id} at index {index} is already contained in this playlist, skipping");
}
}
playlistCache.Add(id, plist);
}
private static void RemoveIndices(DatabasePlaylist playlist, List <UniqueResourceInfo> items, IList <int> indices, int ibegin, int iend)
{
if (iend == ibegin)
{
return;
}
int count = items.Count;
int it = indices[ibegin];
for (int iit = ibegin; iit < iend; iit++)
{
int next = (iit + 1 == iend ? count : indices[iit + 1]);
int moveBegin = indices[iit] + 1;
int moveEnd = next;
it = Move(playlist, items, moveBegin, moveEnd, it);
}
items.RemoveRange(it, items.Count - it);
}
private void EditPlaylistAndWriteInteral(DatabasePlaylist list, Action <PlaylistEditor> editor)
{
editor(new PlaylistEditor(list, this));
AfterPlaylistChanged(list);
}
public PlaylistEditor(DatabasePlaylist playlist, PlaylistDatabase database)
{
this.playlist = playlist;
this.database = database;
}
public bool IsContainedIn(DatabasePlaylist list)
{
return(ContainingListInstances.ContainsKey(list));
}
public bool RemoveList(DatabasePlaylist list)
{
return(ContainingListInstances.Remove(list));
}
private void AfterPlaylistChanged(DatabasePlaylist playlist)
{
io.Write(playlist.Id, playlist);
}
public bool TryGetIndexIn(DatabasePlaylist list, out int index)
{
return(ContainingListInstances.TryGetValue(list, out index));
}
protected bool Equals(DatabasePlaylist other)
{
return(Id == other.Id);
}
