Module org.eclipse.milo.opcua.stack.core

Package org.eclipse.milo.opcua.stack.core.util

Class Lazy<T>

java.lang.Object

org.eclipse.milo.opcua.stack.core.util.Lazy<T>

Type Parameters:

T - the type of value computed and held.

public final class Lazy<T>
extends Object

Thread-safe holder for a lazily-computed value.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	Lazy.ThrowingSupplier<E extends Exception,T>	Like Supplier but it can throw an Exception.

Constructor Summary

Constructors

Constructor	Description
Lazy()

Method Summary

Modifier and Type	Method	Description
T	get(Supplier<T> supplier)	Get the lazily computed value, computing it if necessary using supplier.
<E extends Exception> T	getOrThrow(Lazy.ThrowingSupplier<E,T> supplier)	Get the lazily computed value, computing it if necessary using supplier.
void	reset()	Reset the value to null.
void	set(T value)	Set the value.

Methods inherited from class java.lang.Object

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

Constructor Details

Lazy

public Lazy()

Method Details

get

public T get(Supplier<T> supplier)

Get the lazily computed value, computing it if necessary using supplier.

null values returned by the supplier are not held, i.e. the next call will compute the value again.

Parameters:

supplier - a Supplier that computes the value if necessary.

Returns:

the lazily computed value.

getOrThrow

public <E extends Exception> T getOrThrow(Lazy.ThrowingSupplier<E,T> supplier)
                                   throws E

Get the lazily computed value, computing it if necessary using supplier.

null values returned by the supplier are not held, i.e. the next call will compute the value again.

Parameters:

supplier - a Lazy.ThrowingSupplier that computes the value if necessary.

Returns:

the lazily computed value.

Throws:

E - if the supplier throws an exception.

set

public void set(T value)

Set the value.

Parameters:

value - the value to set.

reset

public void reset()

Reset the value to null.