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Returns an Optional instance with no contained reference.
Returns the equivalent dev.mccue.guava.base.Optional value to the given
java.util.Optional, or null if the argument is null.
If nullableReference is non-null, returns an Optional instance containing that
reference; otherwise returns Optional#absent.
Returns an optional enum constant for the given type, using Enum#valueOf.
Returns an Optional instance containing the given non-null reference.
Returns this Optional if it has a value present; secondChoice otherwise.
If the instance is present, it is transformed with the given Function; otherwise,
Optional#absent is returned.
Returns this Optional if it has a value present; secondChoice otherwise.
Returns the equivalent java.util.Optional value to the given
dev.mccue.guava.base.Optional, or null if the argument is null.
Returns the value of each present instance from the supplied optionals, in order,
skipping over occurrences of Optional#absent.