/// <summary>
/// Invoke this method during runtime to ensure that only one of the two given are setup to run and that only one is available.
/// </summary>
/// <param name="caller">The method in runtime validation</param>
/// <param name="resource"></param>
/// <param name="error">A description of the error if one occurs</param>
/// <param name="dataSource"></param>
/// <returns>True if there is no issue, false if both are either filler out or none are.</returns>
public static bool EnsureExactlyOneAndOfSameType <T>(this IModule caller, IDataSource <T> dataSource, IResource resource, ref string error)
{
return(caller.EnsureExactlyOne(dataSource, resource, ref error) || !caller.EnsureTypesMatch(dataSource, resource, ref error));
}