public override void Visit(BasicRule visitee)
{
PathBasedFieldSelector pathSelector = FindPathSelector(visitee.Selector);
if (pathSelector == null)
{
//TODO: Allow other selectors if they are all equal.
throw new InvalidOperationException("Self referencing selector requires a path based selector.");
}
if (SelectorPath == null)
{
SelectorPath = pathSelector.Path;
Alias = visitee.Alias;
return;
}
if (SelectorPath != pathSelector.Path)
{
throw new InvalidOperationException("Json Rule Tree had multiple different selectors.");
}
if (Alias == null)
{
//Note: If Alias is null, we allow the next rule to provide one.
Alias = visitee.Alias;
return;
}
if (Alias != visitee.Alias)
{
//Note: If multiple aliases was found, we defer back to the selector.
Alias = SelectorPath;
}
}
private static PathBasedFieldSelector FindPathSelector(FieldSelector selector)
{
PathBasedFieldSelector pathSelector = selector as PathBasedFieldSelector;
if (pathSelector != null)
{
return(pathSelector);
}
AggregateFieldSelector aggregateSelector = selector as AggregateFieldSelector;
if (aggregateSelector != null)
{
return(FindPathSelector(aggregateSelector.Selector));
}
return(null);
}
