public override Entity Resolve(Entity owner, string key, bool fallback = false)
{
using (cycleChecker = cycleChecker?.SpawnChild() ?? new CycleChecker <Resolution>(ExceptionTexts.ContentProviderCycle,
() => cycleChecker = null))
{
fallback = false;
IEntityContentProvider provider = GetContentProvider();
if (provider == null)
{
fallback = true;
provider = GetContentProvider();
}
if (provider == null)
{
throw new ContentProviderException(key, owner);
}
cycleChecker.AddItem(new Resolution(owner, key, provider));
return(provider.Resolve(owner, key, fallback));
}
IEntityContentProvider GetContentProvider()
{
return(contentResolvers.Where(r => !cycleChecker.HasItem(new Resolution(owner, key, r)))
.FirstOrDefault(r => r.CanResolve(owner, key, fallback))
?? contentResolvers.FirstOrDefault(r => r.CanResolve(owner, key, fallback)));
}
}
public override bool CanResolve(Entity owner, string key, bool fallback = false)
{
if (cycleChecker?.HasItem(new Resolution(owner, key)) == true)
{
//break cycles before they form
return(false);
}
using (canCycleChecker = canCycleChecker?.SpawnChild() ?? new CycleChecker <Resolution>(ExceptionTexts.ContentProviderCycle,
() => canCycleChecker = null))
{
Resolution resolution = new Resolution(owner, key);
canCycleChecker.AddItem(resolution);
bool result = contentResolvers.Any(r => r.CanResolve(owner, key, false));
if (!result)
{
canCycleChecker.RemoveAfter(resolution);
result = contentResolvers.Any(r => r.CanResolve(owner, key, true));
}
return(result);
}
}
