com.linecorp.armeria.common.util

Interface Unwrappable

All Known Subinterfaces:

Backoff, Client<I,O>, HttpClient, HttpService, HttpServiceWithRoutes, RpcClient, RpcService, RpcServiceWithRoutes, Service<I,O>, ServiceWithRoutes<I,O>, TransientHttpService, TransientRpcService, TransientService<I,O>, WebClient

All Known Implementing Classes:

AbstractBackoff, AbstractCircuitBreakerClient, AbstractCompositeService, AbstractConcurrencyLimitingClient, AbstractHttpService, AbstractRetryingClient, AbstractThrottlingService, AbstractUnwrappable, AnnotatedService, AuthService, BackoffWrapper, CircuitBreakerClient, CircuitBreakerHttpClient, CircuitBreakerRpcClient, ConcurrencyLimitingClient, ConcurrencyLimitingHttpClient, ContentPreviewingClient, ContentPreviewingService, CorsService, DecodingClient, DecoratingClient, DecoratingService, DocService, EncodingService, FileService, HealthCheckService, HttpAuthService, HttpDecodingClient, HttpFileService, HttpHealthCheckService, LoggingClient, LoggingRpcClient, LoggingService, ManagedHttpHealthCheckService, MetricCollectingClient, MetricCollectingRpcClient, MetricCollectingService, PrometheusExpositionService, RedirectService, RetryingClient, RetryingHttpClient, RetryingRpcClient, SimpleCompositeRpcService, SimpleCompositeService, SimpleDecoratingClient, SimpleDecoratingHttpClient, SimpleDecoratingHttpService, SimpleDecoratingRpcClient, SimpleDecoratingRpcService, SimpleDecoratingService, ThrottlingRpcService, ThrottlingService, UserClient

public interface Unwrappable

Provides a way to unwrap an object in decorator pattern, similar to down-casting in an inheritance pattern.

Method Summary

Modifier and Type	Method and Description
default <T> T	as(Class<T> type) Unwraps this object into the object of the specified type.

Method Detail

as

default <T> T as(Class<T> type)

Unwraps this object into the object of the specified type. Use this method instead of an explicit downcast. For example:

 class Foo {}

 class Bar<T> extends AbstractWrapper<T> {
     Bar(T delegate) {
         super(delegate);
     }
 }

 class Qux<T> extends AbstractWrapper<T> {
     Qux(T delegate) {
         super(delegate);
     }
 }

 Qux qux = new Qux(new Bar(new Foo()));
 Foo foo = qux.as(Foo.class);
 Bar bar = qux.as(Bar.class);
 

Parameters:

type - the type of the object to return

Returns:

the object of the specified type if found, or null if not found.