org.springframework.data.util

Class Lazy<T>

java.lang.Object

org.springframework.data.util.Lazy<T>

All Implemented Interfaces:

Supplier<T>

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

Simple value type to delay the creation of an object using a Supplier returning the produced object for subsequent lookups. Note, that no concurrency control is applied during the lookup of get(), which means in concurrent access scenarios, the provided Supplier can be called multiple times.

Since:

2.0

Author:

Oliver Gierke, Mark Paluch

Constructor Summary

Constructors

Constructor and Description
Lazy(Supplier<T> supplier)

Method Summary

Modifier and Type	Method and Description
protected boolean	canEqual(Object other)
boolean	equals(Object o)
<S> Lazy<S>	flatMap(Function<T,Lazy<S>> function) Creates a new Lazy with the given Function lazily applied to the current one.
T	get() Returns the value created by the configured Supplier.
int	hashCode()
<S> Lazy<S>	map(Function<T,S> function) Creates a new Lazy with the given Function lazily applied to the current one.
static <T> Lazy<T>	of(Supplier<T> supplier) Creates a new Lazy to produce an object lazily.
T	orElse(T value) Returns the value of the lazy computation or the given default value in case the computation yields null.
T	orElseGet(Supplier<T> supplier) Returns the value of the lazy computation or the value produced by the given Supplier in case the original value is null.

Methods inherited from class java.lang.Object

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

Constructor Detail

Lazy

@ConstructorProperties(value="supplier")
 @Generated(value="lombok")
public Lazy(Supplier<T> supplier)

Method Detail

of

public static <T> Lazy<T> of(Supplier<T> supplier)

Creates a new Lazy to produce an object lazily.

Type Parameters:

T - the type of which to produce an object of eventually.

Parameters:

supplier - the Supplier to create the object lazily.

Returns:

get

public T get()

Returns the value created by the configured Supplier. Will return the calculated instance for subsequent lookups.

Specified by:

get in interface Supplier<T>

Returns:

orElse

@Nullable
public T orElse(@Nullable
                          T value)

Returns the value of the lazy computation or the given default value in case the computation yields null.

Parameters:

value -

Returns:

orElseGet

@Nullable
public T orElseGet(Supplier<T> supplier)

Returns the value of the lazy computation or the value produced by the given Supplier in case the original value is null.

Parameters:

supplier - must not be null.

Returns:

map

public <S> Lazy<S> map(Function<T,S> function)

Creates a new Lazy with the given Function lazily applied to the current one.

Parameters:

function - must not be null.

Returns:

flatMap

public <S> Lazy<S> flatMap(Function<T,Lazy<S>> function)

Creates a new Lazy with the given Function lazily applied to the current one.

Parameters:

function - must not be null.

Returns:

equals

@Generated(value="lombok")
public boolean equals(Object o)

Overrides:

equals in class Object

canEqual

@Generated(value="lombok")
protected boolean canEqual(Object other)

hashCode

@Generated(value="lombok")
public int hashCode()

Overrides:

hashCode in class Object