Package com.sun.enterprise.universal

Class JavaLangUtils

java.lang.Object

com.sun.enterprise.universal.JavaLangUtils

public final class JavaLangUtils
extends Object

Utility class for all trivial functions missing in Java.

Author:

David Matejcek

Method Summary

Modifier and Type	Method	Description
static <T> T	nonNull(T value, Supplier<? extends T> supplierOfDefault)	If the value is null, calls the supplier to obtain the default value.
static <V, T> T	nonNull(V value, Function<V,T> function, Supplier<? extends T> supplierOfDefault)	If the value is null, calls the supplier to obtain the default value.

Methods inherited from class java.lang.Object

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

Method Details

nonNull

public static <T> T nonNull(T value,
 Supplier<? extends T> supplierOfDefault)

If the value is null, calls the supplier to obtain the default value.

Type Parameters:

T - expected type

Parameters:

value - provided value

supplierOfDefault - must not be null.

Returns:

value OR value provided by the supplier. Note that it may be null too.

nonNull

public static <V,
T> T nonNull(V value,
 Function<V,T> function,
 Supplier<? extends T> supplierOfDefault)

If the value is null, calls the supplier to obtain the default value.

If the value is not null, applies the function.

Type Parameters:

V - input value type

T - expected type

Parameters:

value - provided value - can be null

function - function to apply to the value. Must not be null.

supplierOfDefault - can be null, then supplies null.

Returns:

result of a function OR value provided by the supplier. Note that the returned value may be null too.