private static bool ValidateDUInConditionTransition(NativeActivityUpdateMapMetadata metadata, InternalTransition updatedTransition, InternalTransition originalTransition, out string errorMessage)
{
Fx.Assert(!originalTransition.IsUnconditional, "Transition should be conditional in the original definition.");
errorMessage = string.Empty;
foreach (TransitionData updatedTData in updatedTransition.TransitionDataList)
{
if (metadata.IsReferenceToImportedChild(updatedTData.Condition))
{
// if the trigger is referenced, it might have another save values already.
errorMessage = SR.TriggerOrConditionIsReferenced;
return(false);
}
Fx.Assert(null != updatedTData.Condition, "Must be a condition transition.");
Activity conditionMatch = metadata.GetMatch(updatedTData.Condition);
if (null == conditionMatch && null != metadata.GetMatch(updatedTData.Action))
{
// new Transition.Condition with an Transition.Action moved from within the InternalState.
errorMessage = SR.MovingActivitiesInStateBlockDU;
return(false);
}
else if (null != conditionMatch)
{
bool foundMatchingOriginalCondition = false;
for (int transitionIndex = 0; transitionIndex < originalTransition.TransitionDataList.Count; transitionIndex++)
{
if (object.ReferenceEquals(originalTransition.TransitionDataList[transitionIndex].Condition, conditionMatch))
{
foundMatchingOriginalCondition = true;
// found the original matching condition in updated transition definition.
TransitionData originalTData = originalTransition.TransitionDataList[transitionIndex];
Activity originalAction = originalTData.Action;
// NOTE: Transition.Action is allowed to be removed, because it doesn't change the execution semantics of SM
// if this removed activity was executing, WF runtime would disallow the update.
Activity actionMatch = metadata.GetMatch(updatedTData.Action);
if (null != actionMatch && !object.ReferenceEquals(originalAction, actionMatch))
{
// Transition.Action is an activity moved from elsewhere within the InternalState
errorMessage = SR.MovingActivitiesInStateBlockDU;
return(false);
}
metadata.SaveOriginalValue(updatedTransition.Trigger, originalTransition.InternalTransitionIndex);
metadata.SaveOriginalValue(updatedTData.Condition, transitionIndex);
}
}
if (!foundMatchingOriginalCondition)
{
// another child activity is move to the Transition.Condition.
errorMessage = SR.DUDisallowIfCannotFindingMatchingCondition;
return(false);
}
}
}
return(true);
}