org.grouplens.lenskit.util

Class LazyValue<T>

java.lang.Object

org.grouplens.lenskit.util.LazyValue<T>

Type Parameters:

T - The type of value in the lazy value.

All Implemented Interfaces:

Supplier<T>

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

A thread-safe lazy value class. It waits until its value is actually required to compute it, then caches it.

Author:

GroupLens Research

Constructor Summary

Constructors

Constructor and Description
LazyValue(Callable<T> f) Create a lazy value whose value will be provided by a callable.

Method Summary

Methods

Modifier and Type	Method and Description
T	get() Get the value, computing it if necessary.

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyValue

public LazyValue(@Nonnull
         Callable<T> f)

Create a lazy value whose value will be provided by a callable.

Parameters:

f - The callable responsible for providing the lazy value. The callable's Callable.call() method cannot return null.

Method Detail

get

public T get()

Get the value, computing it if necessary.

Specified by:

get in interface Supplier<T>

Returns:

The value returned by the callable.