Re: [aspectj-users] Introduction/mixin

["Wes Isberg" <wes@xxxxxxxxxxxxxx>]

The standard pattern for mixins offers a slightly simpler way to do this.
Declare an interface and an implementation, then declare that the 
target class implements the interface:

  public aspect IBeanImplementation {
   public interface IBean { ... }
   PropertyChangeSupport IBean.support = new PropertyChangeSupport(this);     
   ...
  }

  aspect BeanSupport { 
     declare parents: C implements IBeanImplementation.IBean;
  }
  class C {  }

Since declare-parents takes a type pattern, you can use something like

     interface ITag {}
     declare parents: ITag+ implements IBeanImplementation.IBean;

or 

     declare parents: (C || D || E) implements IBeanImplementation.IBean;

Wes

------------Original Message------------
From: <mohan.radhakrishnan@xxxxxxxxxxxxx>
To: aspectj-users@xxxxxxxxxxx
Date: Wed, Aug-3-2005 5:53 AM
Subject: [aspectj-users] Introduction/mixin
Hi,
        I want to make the properties of a bean bound properties. So if the properties are changed the listener will
be notified. So if I use introductions then I have to hard-code the name of the bean. 

For example if I have to add this

   private PropertyChangeSupport Operation.support = new PropertyChangeSupport(this);

then 'Operation' is hard-coded.

Is this one of the problems that mixins solve ? I'd like to do this without hard-coding the bean name.


Thanks,
Mohan
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