com.ur.urcap.api.util

Interface Optional<T>

Type Parameters:

T - The type of the value contained in this Optional

public interface Optional<T>

A container which may or may not contain a value. It is used for wrapping the return value of getter methods, where the return value might not be available.

If a value is present (available), the isPresent() method will return true and the value can be retrieved using the get() method.

Method Summary

Modifier and Type	Method and Description
T	get() Gets the value held by this Optional, if a value is present.
boolean	isPresent() Checks if a value is present in this Optional.

Method Detail

isPresent

boolean isPresent()

Checks if a value is present in this Optional. Always use this method to determine, if the Optional holds a value, before accessing it using the get() method.

Returns:

true if there is a value present, otherwise false

get

T get()

Gets the value held by this Optional, if a value is present. Always call the isPresent() method to verify, that a value is available, before calling this method.

Returns:

The value (of type T) held by this Optional

Throws:

NoSuchElementException - if there is no value present in this Optional