public IActivity Build(IBuildContext context)
{
if (!OptionSet)
{
throw new ActivityBuildException("No valid option was set for the build of an activity");
}
try {
IActivity activity;
if (ActivityType != null)
{
if (context == null)
{
throw new ActivityResolveException(ActivityType, "The builder references a type that cannot be resolved outside a context");
}
activity = (IActivity)context.Resolve(ActivityType);
if (activity == null)
{
throw new ActivityResolveException(ActivityType, $"The type '{ActivityType}' is not a valid instance of {typeof(IActivity)}");
}
}
else if (ProxyActivity != null)
{
activity = ProxyActivity;
}
else if (ActivityBranchBuilder != null)
{
activity = ActivityBranchBuilder.Build(context);
}
else
{
activity = new Activity(Name, Decision, Execution);
if (Metadata != null)
{
((Activity)activity).SetMetadata(Metadata);
}
}
if (Factory)
{
if (StateFactory == null &&
StateFactoryType == null)
{
throw new InvalidOperationException("Invalid setup for a state factory");
}
var factory = StateFactory;
if (factory == null && StateFactoryType != null)
{
factory = context.Resolve(StateFactoryType) as IStateFactory;
}
activity = new ActivityFactoryActivity(Name, Decision, activity, factory);
}
return(activity);
} catch (ActivityBuildException) {
throw;
} catch (Exception ex) {
throw new ActivityBuildException("Could not build the activity because of an error: see inner exception for details.", ex);
}
}
