Package com.yahoo.collections

Class Optionals

java.lang.Object

com.yahoo.collections.Optionals

public class Optionals
extends Object

Author:

jonmv

Method Summary

Modifier and Type	Method	Description
static <T> boolean	emptyOrEqual(Optional<T> optional, T value)	Returns whether the optional is empty, or present and equal to the given value.
static <T> boolean	equalIfBothPresent(Optional<T> first, Optional<T> second)	Returns whether either optional is empty, or both are present and equal.
static <T> Optional<T>	firstNonEmpty(Optional<T>... optionals)	Returns the first non-empty optional, or empty if all are empty.
static <T extends Comparable<T>> Optional<T>	max(Optional<T>... optionals)	Returns the non-empty optional with the highest value, or empty if all are empty.
static <T extends Comparable<T>> Optional<T>	min(Optional<T>... optionals)	Returns the non-empty optional with the lowest value, or empty if all are empty.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

firstNonEmpty

@SafeVarargs
public static <T> Optional<T> firstNonEmpty(Optional<T>... optionals)

Returns the first non-empty optional, or empty if all are empty.

min

@SafeVarargs
public static <T extends Comparable<T>> Optional<T> min(Optional<T>... optionals)

Returns the non-empty optional with the lowest value, or empty if all are empty.

max

@SafeVarargs
public static <T extends Comparable<T>> Optional<T> max(Optional<T>... optionals)

Returns the non-empty optional with the highest value, or empty if all are empty.

equalIfBothPresent

public static <T> boolean equalIfBothPresent(Optional<T> first,
 Optional<T> second)

Returns whether either optional is empty, or both are present and equal.

emptyOrEqual

public static <T> boolean emptyOrEqual(Optional<T> optional,
 T value)

Returns whether the optional is empty, or present and equal to the given value.