Package org.qubership.atp.dataset.db.utils

Class Proxies

java.lang.Object

org.qubership.atp.dataset.db.utils.Proxies

public class Proxies
extends Object

Constructor Summary

Constructors

Constructor	Description
Proxies()

Method Summary

Modifier and Type	Method	Description
static <T> T	base(Class<T> type, Supplier<? extends T> sup)	Wraps an supplier into object type of T.
static <T> List<T>	list(Supplier<List<T>> sup)	Wraps a list into proxy.
static <T extends Identified, IdT> T	withId(Class<T> type, IdT id, Function<IdT,? extends T> sourceFunc)	Proxy which obtains a real object using id and sourceFunc on access.

Methods inherited from class java.lang.Object

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

Constructor Details

Proxies

public Proxies()

Method Details

withId

public static <T extends Identified,
IdT> T withId(@Nonnull
 Class<T> type,
 @Nonnull
 IdT id,
 @Nonnull
 Function<IdT,? extends T> sourceFunc)

Proxy which obtains a real object using id and sourceFunc on access. Methods Object.equals(Object), Object.hashCode(), Identified.getId() do not trigger the sourceFunc.

Type Parameters:

T - target

Parameters:

type - target interface

id - identified object id

sourceFunc - explains how to obtain a real instance, should not return null ever

Returns:

proxy

list

public static <T> List<T> list(@Nonnull
 Supplier<List<T>> sup)

Wraps a list into proxy. See base(Class, Supplier)

base

public static <T> T base(@Nonnull
 Class<T> type,
 @Nonnull
 Supplier<? extends T> sup)

Wraps an supplier into object type of T. Supplier is triggered once on access to object methods.

Type Parameters:

T - target

Parameters:

type - target object type

sup - Supplier should not return null ever

Returns:

proxy