/// <summary>
/// Lookup/create a key set for a scheme.
/// </summary>
/// <param name="scheme"></param>
/// <returns></returns>
private IKeySet NewKeysetFor(KeyScheme scheme)
{
if (scheme.IsDual())
return NewKeysetFor((DualKeyScheme)scheme);
else
return NewKeysetFor((SingleKeyScheme)scheme);
}
/// <summary>
/// Get the key set for a given scheme. This set should not be modified.
/// </summary>
/// <param name="scheme">The scheme.</param>
/// <returns>The key set for the scheme. Will be empty if no keys are
/// defined for the scheme.</returns>
private IKeySet KeysetFor(KeyScheme scheme)
{
IKeySet keys;
if (!keySets.TryGetValue(scheme, out keys))
return scheme.IsDual() ? (IKeySet)EmptyDualKeyset : (IKeySet)EmptySingleKeyset;
else
return keys;
}