public void AddTheme(Theme theme)
{
lock (this)
{
if (!_themes.ContainsKey(theme))
{
_themes.Add(theme, new LinkedList<User>());
}
else
{
throw new InvalidOperationException("Theme already exists!");
}
}
}
public void AddUser(Theme theme, User user)
{
lock (this)
{
if (_themes.ContainsKey(theme))
{
var themeUserContainer = _themes[theme];
if (!themeUserContainer.Contains(user))
{
themeUserContainer.AddLast(user);
}
else
{
throw new InvalidOperationException("User already exists!");
}
}
else
{
throw new InvalidOperationException("Theme doesn't exist!");
}
}
}
public void RemoveUser(Theme theme, User user)
{
lock (this)
{
_themes[theme].Remove(user);
}
}
public IEnumerable<User> GetUsers(Theme theme)
{
lock (this)
{
if (_themes.ContainsKey(theme))
{
return _themes[theme];
}
throw new InvalidOperationException("Theme doesn't exist!");
}
}