Package org.kiwiproject.base

Class KiwiObjects

java.lang.Object

org.kiwiproject.base.KiwiObjects

public final class KiwiObjects
extends Object

Utilities for any object which are not in Objects or MoreObjects.

Method Summary

Modifier and Type	Method	Description
static <T> Optional<T>	firstNonNull(T first, T second, T... rest)	Return an Optional containing the first non-null object, or an empty Optional if all are null.
static <T> T	firstNonNullOrNull(T first, T second, T... rest)	Return the first non-null object, or null if all are null.
static <T> Optional<T>	firstSuppliedNonNull(Supplier<T> first, Supplier<T> second, Supplier<T>... rest)	Return an Optional containing the first non-null object, or an empty Optional if all suppliers return null.
static <T> T	firstSuppliedNonNullOrNull(Supplier<T> first, Supplier<T> second, Supplier<T>... rest)	Return the first supplied non-null object, or null if all suppliers return null.

Methods inherited from class java.lang.Object

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

Method Details

firstNonNullOrNull

@SafeVarargs
public static <T> T firstNonNullOrNull(T first,
 T second,
 T... rest)

Return the first non-null object, or null if all are null.

Type Parameters:

T - the type of objects

Parameters:

first - the first object

second - the second object

rest - zero or more additional objects

Returns:

the first non-null object or null if all are null

firstSuppliedNonNullOrNull

@SafeVarargs
public static <T> T firstSuppliedNonNullOrNull(Supplier<T> first,
 Supplier<T> second,
 Supplier<T>... rest)

Return the first supplied non-null object, or null if all suppliers return null.

Type Parameters:

T - the type of objects

Parameters:

first - the first object supplier

second - the second object supplier

rest - zero or more additional object suppliers

Returns:

the first non-null supplied object or null if all suppliers return null

Implementation Note:

once a non-null object is supplied, no further suppliers are called

firstNonNull

@SafeVarargs
public static <T> Optional<T> firstNonNull(T first,
 T second,
 T... rest)

Return an Optional containing the first non-null object, or an empty Optional if all are null.

Type Parameters:

T - the type of objects

Parameters:

first - the first object

second - the second object

rest - zero or more additional objects

Returns:

an optional containing the first non-null object or empty optional if all are null

firstSuppliedNonNull

@SafeVarargs
public static <T> Optional<T> firstSuppliedNonNull(Supplier<T> first,
 Supplier<T> second,
 Supplier<T>... rest)

Return an Optional containing the first non-null object, or an empty Optional if all suppliers return null.

Type Parameters:

T - the type of objects

Parameters:

first - the first object supplier

second - the second object supplier

rest - zero or more additional object suppliers

Returns:

an optional containing the first non-null supplied object or empty optional if all suppliers return null

Implementation Note:

once a non-null object is supplied, no further suppliers are called