Adding to CompositePattern

[Marco Tedone]

Hi, while looking at the @CompositePattern I reliased that it's
missing something: a @DefaultMethod annotation to put on default
methods defined in the "Component" participants. I suggest we add the
following:

@Retention(value = RetentionPolicy.RUNTIME)
@Target(value = ElementType.METHOD)
@Documented
public @interface DefaultMethod {
String comment() default "";
}

This way one would know which methods in the "Component" are provided
just because of the signature but don't actually do anything (options
are ignore, throw a UnsupportedOperationException, etc).

Marco

[Dr Heinz M. Kabutz]

I would vote against this for now, as this is not in the standard GoF
pattern. Any other opinions on this suggestion from Marco?

Regards

Heinz
--
Dr Heinz M. Kabutz (PhD CompSci)
Author of "The Java(tm) Specialists' Newsletter"
Sun Java Champion
http://www.javaspecialists.eu
Tel: +30 69 72 850 460
Skype: kabutz

[Marco Tedone]

Heinz, standard operations are shown in the gof diagram and personally I'd find useful to possibility to tag them as such.
Regards,

Marco

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[Dr Heinz M. Kabutz]

Hi Marco,

you mean the way I did this for the Template Method Pattern?

Regards

Heinz
--
Dr Heinz M. Kabutz (PhD CompSci)
Author of "The Java(tm) Specialists' Newsletter"
Sun Java Champion
http://www.javaspecialists.eu
Tel: +30 69 72 850 460
Skype: kabutz

[Marco Tedone]

Yep, like the templatemethod annotation.

[Marco Tedone]

Errrrmmn sorry I meant primitiveoperation :-)

[Dr Heinz M. Kabutz]

Compare the two diagrams though:

Composite:

http://www.jpatterns.org/apidocs/org/jpatterns/gof/CompositePattern.html

Template Method:

http://www.jpatterns.org/apidocs/org/jpatterns/gof/TemplateMethodPattern.html

(by the way, I just noticed that my naming was wrong. It should've been
PrimitiveOperation, not PrimitiveMethod.)

What would you like to make defaultMethod()? add/remove/getChild()? or
the operation()?

Regards

Heinz
--
Dr Heinz M. Kabutz (PhD CompSci)
Author of "The Java(tm) Specialists' Newsletter"
Sun Java Champion
http://www.javaspecialists.eu
Tel: +30 69 72 850 460
Skype: kabutz

[Marco Tedone]

add/remove/getChild() - Or, applying to the Composite exercise for the
webinar, isLeaf() and children(), so to speak.

Marco