public bool Join(List <Origin> voters, Origin voterToJoin)
{
bool joined = false;
UndoBuffer.Push(new UndoAction(UndoActionType.Join, VoteStorage));
foreach (var voter in voters)
{
joined = JoinImpl(voter, voterToJoin) || joined;
}
if (joined)
{
OnPropertyChanged("Votes");
OnPropertyChanged("Voters");
OnPropertyChanged(nameof(HasUndoActions));
}
else
{
UndoBuffer.Pop();
}
return(joined);
/// <summary>
/// Implement joining logic per voter.
/// </summary>
/// <param name="joiningVoter">The voter being moved to a new voting support set.</param>
/// <param name="voterToJoin">The voter being joined.</param>
/// <returns>Returns true if the join was completed.</returns>
bool JoinImpl(Origin joiningVoter, Origin voterToJoin)
{
var source = GetVotesBy(joiningVoter);
var dest = GetVotesBy(voterToJoin);
if (!source.Any() || !dest.Any())
{
return(false);
}
bool joined = false;
// Remove support from any votes where the target voter isn't also present.
foreach (var vote in source)
{
if (!VoteStorage.DoesVoterSupportVote(voterToJoin, vote))
{
VoteStorage.RemoveSupporterFromVote(vote, joiningVoter);
}
}
VoteStorage.RemoveUnsupportedVotes();
foreach (var vote in dest)
{
if (!VoteStorage.DoesVoterSupportVote(joiningVoter, vote))
{
VoteStorage.AddSupporterToVote(vote, joiningVoter);
joined = true;
}
}
return(joined);
}
}
