SelectableValue

All Known Implementing Classes:

OptionalValue, StructValue
```
public interface SelectableValue<T>
```
SelectableValue is an interface for representing a value that supports field selection and presence tests. Few examples are structs, protobuf messages, maps and optional values.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.Optional<? extends java.lang.Object>`	`find(T field)`	Finds the field.
`java.lang.Object`	`select(T field)`	Performs field selection.

- Method Detail
  - select
```
java.lang.Object select(T field)
```
    Performs field selection. The behavior depends on the concrete implementation of the value being selected. For structs and maps, this must throw an exception if the field does not exist. For optional values, this will return an optional.none().
  - find
```
java.util.Optional<? extends java.lang.Object> find(T field)
```
    Finds the field. This will return an Optional.empty() if the field does not exist. This can be used for presence testing.