Package org.apache.qpid.proton.engine

Class ExtendableAccessor<E extends Extendable,​T>

  • Type Parameters:
    E - An Extendable type where the data is to be stored
    T - The type of the data to be stored
    public final class ExtendableAccessor<E extends Extendable,​T>
extends java.lang.Object
    A typesafe convenience class for associating additional data with Extendable classes.

    An instance of ExtendableAccessor uses itself as the key in the Extendable.attachments() so it's best instantiated as a static final member. 

    
   class Foo extends BaseHandler {
     private static ExtendableAccessor<Link, Bar> LINK_BAR = new ExtendableAccessor<>(Bar.class);
     void onLinkRemoteOpen(Event e) {
       Bar bar = LINK_BAR.get(e.getLink());
       if (bar == null) {
         bar = new Bar();
         LINK_BAR.set(e.getLink(), bar);
         }
       }
     }

    • Constructor Summary

      Constructors 
      Constructor Description
      ExtendableAccessor​(java.lang.Class<T> klass)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      T get​(E e)  
      void set​(E e, T value)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • ExtendableAccessor

        public ExtendableAccessor​(java.lang.Class<T> klass)

    • Method Detail

      • get

        public T get​(E e)

      • set

        public void set​(E e,
                T value)