de.larssh.utils

Class Finals

java.lang.Object

de.larssh.utils.Finals

public final class Finals
extends Object

This class contains helper methods for final fields.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Finals.CachingSupplier<T> Supplier implementation proxying another supplier while calculating its return value at most one time.

Method Summary

Modifier and Type	Method and Description
static <T> T	constant(T value) Returns value unchanged.
static <T> Finals.CachingSupplier<T>	lazy(Supplier<T> supplier) Returns a new Supplier that calculates its return value at most one time.

Methods inherited from class java.lang.Object

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

Method Detail

constant

public static <T> T constant(T value)

Returns value unchanged. This prevents compilers from inlining constants (static final fields). Depending classes referring to the constant do not need to be recompiled if the constant value changes.

Inlining affects primitive data types and strings.

Usage example:

public static final String CONSTANT_FIELD = constant("constant value");

Type Parameters:

T - return type

Parameters:

value - value

Returns:

value

lazy

public static <T> Finals.CachingSupplier<T> lazy(Supplier<T> supplier)

Returns a new Supplier that calculates its return value at most one time. Therefore it can be used to create lazy fields.

This implementation is synchronized. supplier is guaranteed to be called at max once.

Type Parameters:

T - return type

Parameters:

supplier - value supplier

Returns:

value