public bool Delete(IEnumerable <DataRepository> observedDataToBeRemoved)
{
var observedDataToRemoveList = observedDataToBeRemoved.ToList();
var usedInAnalyzablesCache = new Cache <DataRepository, IEnumerable <IUsesObservedData> >();
observedDataToRemoveList.Each(x =>
{
usedInAnalyzablesCache[x] = allUsersOfObservedData(x);
});
var observedDataThatCanBeRemoved = observedDataToRemoveList.Where(x => !usedInAnalyzablesCache[x].Any()).ToList();
var observedDataNotDeleted = observedDataToRemoveList.Except(observedDataThatCanBeRemoved);
var observedDataNotDeletedMessage = observedDataNotDeleted.Select(x => messageForObservedDataUsedByAnalysable(x, usedInAnalyzablesCache));
//not one observed data can be deleted because all of them are used
if (!observedDataThatCanBeRemoved.Any())
{
throw new CannotDeleteObservedDataException(observedDataNotDeletedMessage);
}
var viewResult = _dialogCreator.MessageBoxYesNo(Captions.ReallyDeleteAllObservedData(observedDataNotDeletedMessage));
if (viewResult == ViewResult.No)
{
return(false);
}
return(deleteAll(observedDataThatCanBeRemoved));
}