/// <summary>
/// Creates an <see cref="IEnumerable{T}" /> from an <see cref="IMMPxTransition" />
/// </summary>
/// <param name="source">An <see cref="IMMPxTransition" /> to create an <see cref="IEnumerable{T}" /> from.</param>
/// <returns>An <see cref="IEnumerable{T}" /> that contains the fields from the input source.</returns>
public static IEnumerable <IMMPxTransition> AsEnumerable(this IMMEnumPxTransition source)
{
if (source != null)
{
source.Reset();
IMMPxTransition transition = source.Next();
while (transition != null)
{
yield return(transition);
transition = source.Next();
}
}
}
/// <summary>
/// Determines if a transition exists between the <paramref name="fromState" /> and
/// the <paramref name="toState" /> states for the specified <paramref name="user" />.
/// </summary>
/// <param name="source">The transitions.</param>
/// <param name="user">The user.</param>
/// <param name="fromState">The From state.</param>
/// <param name="toState">The To state.</param>
/// <returns>
/// Returns a <see cref="bool" /> representing <c>true</c> if there exists a transition; otherwise, <c>false</c>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// user
/// or
/// fromState
/// or
/// toState
/// </exception>
public static bool IsValidTransition(this IMMEnumPxTransition source, IMMPxUser user, IMMPxState fromState, IMMPxState toState)
{
if (source == null)
{
return(false);
}
if (user == null)
{
throw new ArgumentNullException("user");
}
if (fromState == null)
{
throw new ArgumentNullException("fromState");
}
if (toState == null)
{
throw new ArgumentNullException("toState");
}
return(source.AsEnumerable().Any(transition => transition.IsValidTransition(user, fromState, toState)));
}
