Package com.linecorp.armeria.common.util

Class AbstractUnwrappable<T extends Unwrappable>

java.lang.Object
com.linecorp.armeria.common.util.AbstractUnwrappable<T>
Type Parameters:
T - the type of the object being decorated
All Implemented Interfaces:
Unwrappable
Direct Known Subclasses:
BackoffWrapper, ConnectionPoolListenerWrapper, DecoratingClient, DecoratingClientFactory, DecoratingService, RequestContextStorageWrapper, UserClient
public abstract class AbstractUnwrappable<T extends Unwrappable> extends Object implements Unwrappable
Skeletal Unwrappable implementation.

  • Constructor Details

    • AbstractUnwrappable

      protected AbstractUnwrappable​(T delegate)
      Creates a new decorator with the specified delegate.

  • Method Details

    • as

      public final <U> U as​(Class<U> type)
      Description copied from interface: Unwrappable
      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);
      Specified by:
      as in interface Unwrappable
      Parameters:
      type - the type of the object to return
      Returns:
      the object of the specified type if found, or null if not found.

    • unwrap

      public T unwrap()
      Description copied from interface: Unwrappable
      Unwraps this object and returns the object being decorated. If this Unwrappable is the innermost object, this method returns itself. For example: 
      
 class Foo implements Unwrappable {}

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

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

 Foo foo = new Foo();
 assert foo.unwrap() == foo;

 Bar<Foo> bar = new Bar<>(foo);
 assert bar.unwrap() == foo;

 Qux<Bar<Foo>> qux = new Qux<>(bar);
 assert qux.unwrap() == bar;
 assert qux.unwrap().unwrap() == foo;
      Specified by:
      unwrap in interface Unwrappable

    • toString

      public String toString()
      Overrides:
      toString in class Object