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Re: [aspectj-users] initialising instance variables
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From memory only, I believe that you had:
b = new Foo();
where b was some inherited instance variable. That has to be in a
constructor or initialier because it's not part of a member declaration.
This:
> private PropertyChangeSupport Point.support = new
> PropertyChangeSupport(this);
is part of one.
That is (I *think*) the answer to the first implicit problem.
As to your follow-on question, I need a clarification:
> If I make the instance variables static and add a
> static constructor to LoggingAspect, it compiles (and
> works) fine.
What do you mean by "static constructor"?
Cheers,
Nick
--- Aaron Blishen <aaron_blishen@xxxxxxxxx> wrote:
> Hi All,
>
> I have tried to intialise the intance variables in a
> constructor (I assumed that one was not needed as some
> of the examples in the programming guide do not have
> one) i.e:
>
> aspect BoundPoint {
> private PropertyChangeSupport Point.support = new
> PropertyChangeSupport(this);
>
> ....
>
> }
> Is this becuase the aspect is adding an instance
> variable to the class Point, and adds initialisation
> of support into the Point constructor?
>
> Here is my problem when I add a constructor:
>
> public abstract aspect LoggingAspect
> {
> // call depth per logger
> protected int callDepth;
>
> // (commons) Log4j logger
> protected Log log;
>
> // class unspecified
> public abstract pointcut cutClass(Object o);
>
> // pointcuts and advice for intercepting constructor
> and
> // method calls based on unspecified class
> }
>
> public aspect myClassLogger extends LoggingAspect
> {
> // initialise logger and calldepth
> public myClassLogger()
> {
> callDepth = 2;
> log = LogFactory.getLogger
> (myClassLogger.class);
> }
>
> public pointcut cutClass(Object o) : this(o)
> && within(com.foo.myClass);
>
> // custom logging methods for myClass
> }
>
> The compiler complains:
>
> inherited abstract pointcut
> LoggingAspect.cutClass(java.lang.Object) is not made
> concrete in com.foo.myClassLogger
>
> If I make the instance variables static and add a
> static constructor to LoggingAspect, it compiles (and
> works) fine.
>
> Cheers,
>
> Aaron.
>
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