CelAttributeResolver

```
public interface CelAttributeResolver
```
Resolver for attribute lookups at runtime.
Attributes identify resolvable parts of state available in the CEL expression.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.Optional<CelUnknownSet>`	`maybePartialUnknown(CelAttribute attr)`	Returns an unknown set containing the attribute if it is determined as partially unknown.
`java.util.Optional<java.lang.Object>`	`resolve(CelAttribute attr)`	Attempts to resolve an attribute exactly.

- Method Detail
  - resolve
```
java.util.Optional<java.lang.Object> resolve(CelAttribute attr)
```
    Attempts to resolve an attribute exactly.
    May return an UnknownSet if the attribute is unknown, a value if it has been resolved, or Optional.empty() if the attribute isn't declared as an unknown.
  - maybePartialUnknown
```
java.util.Optional<CelUnknownSet> maybePartialUnknown(CelAttribute attr)
```
    Returns an unknown set containing the attribute if it is determined as partially unknown.
    A partial match is defined as an attribute whose sub-elements match an unknown pattern. E.g., attribute com.google.container is partially unknown with pattern com.google.container.element