net.lenni0451.commons.lazy

Class Lazy<T>

java.lang.Object

net.lenni0451.commons.lazy.Lazy<T>

Type Parameters:

T - The type of the object

Direct Known Subclasses:

ExpiringLazy

@ThreadSafe
public abstract class Lazy<T>
extends java.lang.Object

An object to store a value that is only initialized when required.
Useful for objects that are expensive to create and are not always needed.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.lang.Object	lock

Constructor Summary

Constructors

Constructor and Description
Lazy()

Method Summary

Modifier and Type	Method and Description
protected abstract T	calculate()
T	get()
void	invalidate() Invalidate the current value so that it will be recalculated on the next call of get().
boolean	isInitialized()
static <T> Lazy<T>	of(java.util.function.Supplier<T> supplier) Create a new lazy object.

Methods inherited from class java.lang.Object

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

Field Detail

lock

protected final java.lang.Object lock

Constructor Detail

Lazy

public Lazy()

Method Detail

of

public static <T> Lazy<T> of(java.util.function.Supplier<T> supplier)

Create a new lazy object.

Type Parameters:

T - The type of the object

Parameters:

supplier - The supplier to create the object

Returns:

The lazy object

isInitialized

public boolean isInitialized()

get

public T get()

Returns:

The value of the object

invalidate

public void invalidate()

Invalidate the current value so that it will be recalculated on the next call of get().
This method only sets the initialized flag to false and does not reset the value itself.

calculate

protected abstract T calculate()