Module it.tidalwave.util

Package it.tidalwave.util

Class LazySupplier<T>

java.lang.Object

it.tidalwave.util.LazySupplier<T>

All Implemented Interfaces:

Supplier<T>

public class LazySupplier<T>
extends Object
implements Supplier<T>

A supplier of an object that is lazily evaluated (when its value is requested for the first time). It warranties that the real wrapped supplier is called only once.

Since:

3.2-ALPHA-13

Author:

Fabrizio Giudici

Constructor Summary

Constructors

Constructor	Description
LazySupplier()

Method Summary

Modifier and Type	Method	Description
void	clear()	Clears the supplier.
T	get()
Optional<T>	peek()	Returns the value without computing it: unlike get(), this method never calls the wrapped supplier, so it can be used to find out whether the value is available without the side effects of computing it.
void	set(T ref)	Changes the reference.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

LazySupplier

public LazySupplier()

Method Details

get

@Nonnull
public T get()

Specified by:

get in interface Supplier<T>

peek

@Nonnull
public Optional<T> peek()

Returns the value without computing it: unlike get(), this method never calls the wrapped supplier, so it can be used to find out whether the value is available without the side effects of computing it. The returned Optional contains the value if it has been computed and is not null.

Returns:

the value, if available, or an empty Optional

Since:

5.0-ALPHA-4

clear

public void clear()

Clears the supplier.

set

public void set(@Nonnull
 T ref)

Changes the reference.

Parameters:

ref - the new reference

toString

@Nonnull
public String toString()

Overrides:

toString in class Object