Re: [ve-dev] How to extend VE in the following situation:

[Dr Gili Mendel <gmendel@xxxxxxxxxx>]

There are a few options to do this with
VE.

The main inhibition in your example
is the "this" part.  VE can not instantiate the "this"
part, as it is the class that you are working on.   The target VM
works with (saved) compiled files.
If you will use a "this" in
the constructor or setting, VE will give you "too complicated to evaluate".

... so you have two options.  Let
me start with a high level description for now, and we can dive into detail
as we go along:

1.  
      ivjActSend = new sample.vep.SendAction(this);
// The "this" must be in the constructor for all 
       
                     
                     
                     
  //classes derived from MyGenericAction after I put action to Panel


The constructor statement is typically
generated by a method template.   You can use the VE override files
to specify a different method generation template that will use the proper
constructor for the sample.vep.SendAction
class hierarchy.  ... but you will also have to change the BeanProxyAdapter
classes so that on the target VM a new
sample.vep.SendAction(this)
 will be invoked as new
sample.vep.SendAction(); null constructor.
This will enable the target VM to
instantiate the SendAction bean, and still generate the proper run time
code (WYSIWYG issues here)


2.  
ivjActSend = new sample.vep.SendAction();
       ivjActSend.setOwner(this);
 // this code must be inserted automatically 
       
                     
                    //for
all classes derived from MyGenericAction after I put action to Panel


You can extend VE to generate the setOwner
setting as you drop the component .... but as noted above if you use a
"this" for the setting, VE will generate an error.
 

Rather than this, VE can work with static
element within your "this" class; if this is an option for you
can avoid the "this" problems.



------------
Dr. Gili Mendel
IBM
Software Development
RTP Raleigh, NC
(919)543 6408, tie: 441 6408

"Max" <max@xxxxxxxx>
Sent by: ve-dev-admin@xxxxxxxxxxx

07/05/2004 09:40 AM

Please respond to
ve-dev

To	<ve-dev@xxxxxxxxxxx>
cc
Subject	Re: [ve-dev] How to extend VE in the following situation:

Dear VE developers,
 
I've asked the question (see below) two times
and unfortunately have no
any response. Probably this is not the right
place for asking such questions?
Please, give me any feedback. Where I should
ask such questions? Or give any
information source I could figure out answer
from.
Sorry, if this is not the right place for
such questions.
 
Thanks,
Maxim
 
----- Original Message ----- 
From: Max

To: ve-dev@xxxxxxxxxxx

Sent: Friday, July 02, 2004 5:31 PM
Subject: [ve-dev] How to extend VE in the following
situation:

Hi,
 
I'd like to change/extend VE to generate
a slightly different code in getter method
for a particular class. (SWING based)
 
1. In my application I have class:
 
class MyGenericAction extends
javax.swing.AbstractAction {
    public void setOwner(Jpanel
owner) {
       
....
    }
}
 
And I have different particular implementations
of MyGenericAction e.g:
 
class SendAction extends MyGenericAction
{
}
 
2. I create JPanel in VE and put my
SendAction into the panel and set
properties Enabled and Name. VE generates
the following code:
private sample.vep.SendAction
getIvjActSend() {
    if (ivjActSend
== null) {
       ivjActSend
= new sample.vep.SendAction();
       ivjActSend.setEnabled(true);
       ivjActSend.setName("Hello");
  }
   return ivjActSend;
}
3. The issue is that I know that any
MyGenericAction instance always requires
also Owner property to be specified and the
user can forget to specify it explicitly.
So I need to override code generation for
all classes extending MyGenericAction
in the following way:
 
1st option
private sample.vep.SendAction
getIvjActSend() {
    if (ivjActSend
== null) {
       ivjActSend
= new sample.vep.SendAction(this); // The "this" must
be in the constructor for all 
       
                     
                     
                     
  //classes derived from MyGenericAction after I put action to Panel
       ivjActSend.setEnabled(true);
       ivjActSend.setName("Hello");
  }
   return ivjActSend;
}
 
2nd option
private sample.vep.SendAction
getIvjActSend() {
    if (ivjActSend
== null) {
       ivjActSend
= new sample.vep.SendAction();
       ivjActSend.setOwner(this);
 // this code must be inserted automatically 
       
                     
                    //for
all classes derived from MyGenericAction after I put action to Panel
       ivjActSend.setEnabled(true);
       ivjActSend.setName("Hello");
  }
   return ivjActSend;
}

Questions
Could you please provide some recommendations
for implementig such or similar functionality?
Which extension points I need to implement
to add the functionality?
 
Thanks in advance,
Maxim