public NullabilityAttributeSymbols GetSymbols(Compilation compilation,
CancellationToken cancellationToken = default(CancellationToken))
{
Guard.NotNull(compilation, nameof(compilation));
NullabilityAttributeSymbols symbolsSnapshot = symbols.Value;
NullabilityAttributeMetadataNames previousNames =
symbolsSnapshot?.GetMetadataNames() ?? names.Value ?? LastSeenNames.Value;
symbolsSnapshot = previousNames?.GetSymbolsOrNull(compilation);
if (symbolsSnapshot == null)
{
var provider = new SimpleNullabilityAttributeProvider();
symbolsSnapshot = provider.GetSymbols(compilation, cancellationToken);
}
if (symbolsSnapshot != null)
{
names.Value = symbolsSnapshot.GetMetadataNames();
LastSeenNames.Value = names.Value;
}
symbols.Value = symbolsSnapshot;
return(symbolsSnapshot);
}
public CachingNullabilityAttributeProvider([CanBeNull] NullabilityAttributeMetadataNames names = null)
{
this.names.Value = names;
}