[Opensource] Réf. : Re: [Opensource] ActionForms and Validation

[Raul DAVIDOVICH]

I sent ths email one hour too early... ;-)

I found the struts-config.xml part, but I extended DefaultForm instead of
ControllerForm, otherwise I get a class cast exception

Just by doing this it fills the bean correctly and I can use my get and set
methods...

what it's tricky (almost a hack) is the way to retrieve the ActionForm
inside the controller.. here's my code:


public class MyForm extends DefaultForm {
  private String myVar;

  public void setMyVar(String myVar) {
    this.myVar= myVar;
  }

  public String getMyVar() {
    return myVar;
  }
...
}

MyForm myForm = (MyForm) params.getSession
().getAttribute(params.getFormAttribute());
    if (myForm == null) {
      myForm = (MyForm) params.getSession
().getPersistentAttribute(params.getFormAttribute());
    }


there is a getDefautForm() method in ControllerResponse which does exactly
this, but it is protected and I didn't want to mess up with the interfaces
(I preffer to leave that to those who know what they do ;-)
but there is no ControllerRequest.getDefaultForm() method, which might do
some sense. is there a cleaner way to retrieve the form inside the
controller?


Anyway, this is not the interesting part, since request.getParameter
("name") is much easier and straightforward... where this is interesting is
to extend ValidatorForm, which uses commons-validator and then you can have
your validation in an xml file with all the benefits that pluggable
validators give.




I didn't fully get what you mean by State.perform() and State.run() If I
understand right, we could say that a State's perform method is equivalent
to a Struts' Action's perform() method, and then from my controller I call
MyState.perform() from inside runDoSomethingState()? or is this method
called automatically? I'm a bit confused here :-(

this is what I do usually:

public class MyController
    extends DBController {

public MyController() {
    super();
State doSomething = new State("doSomething ", "MyState");
addState(doSomething );
...
}

 protected ControllerResponse runDoSomethingState(ControllerRequest params,
                                                  ControllerResponse
response) throws
      ControllerException {
//do something
...
//go to next state, usually a list or prompt state
try {
          transition("doSomethingElse", params, response);
        }
        catch (NonHandleableException nhe) {
          errors.addError("problem after transition");
        }
}
...
}


according to what you say, should I do:


public class DoSomething extends State(){
...
public void perform(StateForm stateForm, ControllerRequest newRequest,
                        ControllerResponse newResponse)
            throws NonHandleableException, ControllerException {
        //do something
    }
}




import com.mycompany.myapp.states.DoSomething;

public class MyController
    extends DBController {

public MyController() {
    super();

addState(new DoSomething() );
...
}

 protected ControllerResponse runDoSomethingState(ControllerRequest params,
                                                  ControllerResponse
response) throws
      ControllerException {

//and here???

}
...
}




Also, what is the difference between transition("name", request, response)
and MyState.perform(stateForm, request, response)?



I'm really sorry to ask you all this on friday ;-)


thanks in advance


Best regards,



---------------------------------------------------
Raul Davidovich
Responsable Informatique
Cvitkovic & Associés Consultants

(33) 1 45 15 40 68
(33) 1 45 15 40 41 Fax
-------------------------------------------------------
http://www.caconcology.com


|---------+------------------------------->
|         |           Mike Traum          |
|         |           <mtraum at jgroup.net> |
|         |           Envoyé par :        |
|         |           opensource-admin at jco|
|         |           rporate.com         |
|         |                               |
|         |                               |
|         |           15/01/2004 19:22    |
|         |           Veuillez répondre à |
|         |           opensource          |
|         |                               |
|---------+------------------------------->
  >--------------------------------------------------------------------------------------------------------------------------------------------------|
  |                                                                                                                                                  |
  |       Pour :    opensource at jcorporate.com                                                                                                        |
  |       cc :                                                                                                                                       |
  |       Objet :   Re: [Opensource] ActionForms and Validation                                                                                      |
  >--------------------------------------------------------------------------------------------------------------------------------------------------|




ControllerForm extends ActionForm, so you can extend that. Then you
define that in struts-config.xml <form-beans/> and in the 'name'
parameter of the action mapping. To validate, I believe you override the
validate(ActionMapping mapping, HttpServletRequest request) method of
ActionForm. Also, I believe you should use State.perform instead of
State.run so that you'll have access to that form bean from the state.

You can also use Expresso methods, such as State.addParameter(String
newParam, boolean required, String mask, String maskError). See
SimpleLoginController.java for an example of this.

Or, there's State.setMask() & State.checkParamMasks(). Or,
State.autoValidate() to validate data based on a DBObject definition.

request.getParameter("name") is generally how you get a parameter in
expresso. It's getting it from the ControllerRequest. If you use a
custom ControllerForm, you'll want to use the form bean.

hth,
mike


On Thu, 2004-01-15 at 09:14, Raul DAVIDOVICH wrote:
> Hi all,
>
> I'm trying to implement form validation in expresso.
>
> In struts, one just needs to extend ValidatorForm instead of ActionForm
and
> the job is done.. but in expresso I'm having a real hard time to find out
> how and where action forms are implemented so I can add this.
>
> Up to now I've been using request.getParameter("paramName") for
retrieving
> the fields from the page, and now that I look further I cannott find them
> beeing mapped to an actionform anywhere.
>
> I did see that there are some methods in the controller for retrieving
the
> form from the request, but it's empty.
>
>
>
> if anyone can point me to where I can start looking it would be very
> helpful.
>
>
> Thanks in advance
>
> Best regards,
>
> ---------------------------------------------------
> Raul Davidovich
> Responsable Informatique
> Cvitkovic & Associés Consultants
>
> (33) 1 45 15 40 68
> (33) 1 45 15 40 41 Fax
> -------------------------------------------------------
> http://www.caconcology.com
>
>
> _______________________________________________
> Opensource mailing list
> Opensource at jcorporate.com
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--

Mike Traum
--
JGroup Expert
Expresso Core Developer
Providing support and development services - Available Now!

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