Whats the risk here ? The default StringConverter in wicket does nothing
when invoked for String-String conversion.
Ari S.
----- Original Message -----
From: "Igor Vaynberg" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, March 09, 2006 10:42 AM
Subject: Re: [Wicket-user] TextField and trimming blanks at end (and maybe at
beginning)
this is not a kind of a problem i would want to be tracing for, especially
as a user. you add your own string converter and that suddenly breaks some
internal feature that you dont even know about, or maybe it even breaks some
3rd party components.
i know i feel strongly about this one. how strong do you feel? should we
have a vote?
-Igor
On 3/9/06, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
>
> It's potentially dangerous, second that. But the argument of whether
> it is a good use of converters or not aside, when I put on my user hat
> and look at that API, *I* would expect conversion to happen from input
> parameters to my model properties regardless whether it has the target
> type or not.
>
> Eelco
>
>
> On 3/9/06, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
> > this might have nasty side effects that we do not see right now. for
> example
> > converters are going to start running on things they werent running on
> > before. how is this going to affect existing applications?
> >
> > furthermore afaict the intention behind converters was to have a generic
> > /type/ conversion framework for use inside wicket core. you can see they
> are
> > intended to be /type/ converters by looking at the javadoc of
> > IConverter.convert(Object, Class). how is a trimming string converter
> that
> > is running on values that are already strings and trimming them going to
> > affect places in wicket's core outside form processing?
> >
> > i still dont think this is the right approach. we should think of
> something
> > else.
> >
> >
> > > getInput would be fine if we were just starting development. But we
> have a
> > big
> > > application going to production soon and I'm seeking some kind of
> another
> > alternative
> > > than telling all developers to change their TextFields to
> > MyTrimmerTextFields.
> > so why are you just now thinking about this? sounds to me like you are
> > dealing with this issue too late. (not that we are not willing to help
> you)
> >
> > -Igor
> >
> >
> >
> > On 3/8/06, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
> > >
> > I agree with Ari and I am not against removing that check.
> >
> > Eelco
> >
> >
> > On 3/8/06, Ari Suutari <[EMAIL PROTECTED]> wrote:
> > > Hi,
> > >
> > > getInput would be fine if we were just starting development. But we
> have
> > a big
> > > application going to production soon and I'm seeking some kind of
> another
> > alternative
> > > than telling all developers to change their TextFields to
> > MyTrimmerTextFields.
> > > Converter interface has been very handy for me before, but it just
> failed
> > on this one.
> > >
> > > Why should you think Converter only as datatype converter ? I'm sure
> that
> > > there are plenty of use cases where manipulating also the value would
> be
> > handy.
> > > Also, I don't think that removing the short-circuit done by
> > isAssignableFrom
> > > woundn't be a performace problem ?
> > >
> > > What I have liked about wicket a lot is that there are a lot of
> different
> > interfaces
> > > that one can use to get between things and alter the behaviour for
> local
> > needs
> > > without creating a derived component of each standard component. This
> is
> > also
> > > the reason I'm insisting about similar solution here.
> > >
> > > Ari S.
> > >
> > > ----- Original Message -----
> > > From: "Igor Vaynberg" <[EMAIL PROTECTED]>
> > > To: < [email protected]>
> > > Sent: Wednesday, March 08, 2006 9:23 AM
> > > Subject: Re: [Wicket-user] TextField and trimming blanks at end (and
> maybe
> > at beginning)
> > >
> > >
> > > but is it really then a conversion? why run a Integer->Integer
> conversion
> > or
> > > a String->String conversion? then you are really warping the converter
> > into
> > > an input postprocessor. why not create a simple subclass of textfield
> and
> > > override getInput() ?
> > >
> > > -Igor
> > >
> > >
> > > On 3/7/06, Ari Suutari <[EMAIL PROTECTED]> wrote:
> > > >
> > > > Could someone also take a look at Converter so it could be used ?
> > > > I mean this line in Converter.java:
> > > >
> > > > // Catch all cases where value is already the right type
> > > > if (c.isAssignableFrom(value.getClass()))
> > > > {
> > > > return value;
> > > > }
> > > >
> > > > This is some kind of a optimization, right ? But as a side effect
> > > > it makes it impossible to do any conversion on textfield input
> > > > if it is stored to String field in model (quite usual case, I
> think).
> > > >
> > > > Maybe just drop those lines ?
> > > >
> > > > Ari S.
> > > >
> > > > ----- Original Message -----
> > > > From: "Eelco Hillenius" < [EMAIL PROTECTED]>
> > > > To: <[email protected]>
> > > > Sent: Tuesday, March 07, 2006 7:22 PM
> > > > Subject: Re: [Wicket-user] TextField and trimming blanks at end (and
> > maybe
> > > > at beginning)
> > > >
> > > >
> > > > >I don't think we need it in core. Maybe as an example somewhere. We
> > > > > have to get our users get used to working with custom components
> more,
> > > > > as that's one of the key points of Wicket imo :)
> > > > >
> > > > > Eelco
> > > > >
> > > > >
> > > > > On 3/7/06, Igor Vaynberg < [EMAIL PROTECTED]> wrote:
> > > > >> but do we need this in core? its a trivial subclass, why not
> create
> > it
> > > > in
> > > > >> your own codebase?
> > > > >>
> > > > >> if you guys want it in core you can have it, just asking.
> > > > >>
> > > > >> -Igor
> > > > >>
> > > > >>
> > > > >>
> > > > >> On 3/7/06, Ryan Sonnek <[EMAIL PROTECTED] > wrote:
> > > > >> > +1 for this solution. this seems to be the cleanest
> implementation
> > > > to
> > > > >> > me and puts the responsibility on the developer to *use* the
> > correct
> > > > >> > component.
> > > > >> >
> > > > >> > On 3/7/06, Igor Vaynberg < [EMAIL PROTECTED]> wrote:
> > > > >> > > i guess thats true. you can create a subclass
> TrimmingTextField
> > > > that
> > > > >> > > overrides getInput() and trims it.
> > > > >> > >
> > > > >> > >
> > > > >> > > -Igor
> > > > >> > >
> > > > >> > >
> > > > >> > > On 3/7/06, Johan Compagner < [EMAIL PROTECTED]> wrote:
> > > > >> > > >
> > > > >> > > > So before the input goes into the required/type conversion
> and
> > > > >> validators
> > > > >> > > we first trim it
> > > > >> > > > when that flag is set?.
> > > > >> > > >
> > > > >> > > > he also could just overwrite getInput() and trim the text
> when
> > > > called.
> > > > >> > > >
> > > > >> > > >
> > > > >> > > > johan
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > > On 3/7/06, Igor Vaynberg < [EMAIL PROTECTED] > wrote:
> > > > >> > > > >
> > > > >> > > > > i was also thinking a trim flag on the textfield and
> textarea
> > > > only.
> > > > >> are
> > > > >> > > you opposed to that also Johan?
> > > > >> > > > >
> > > > >> > > > >
> > > > >> > > > > -Igor
> > > > >> > > > >
> > > > >> > > > >
> > > > >> > > > >
> > > > >> > > > >
> > > > >> > > > > On 3/7/06, Johan Compagner < [EMAIL PROTECTED]> wrote:
> > > > >> > > > > >
> > > > >> > > > > > You also could use a Converter for this i guess.
> > > > >> > > > > >
> > > > >> > > > > >
> > > > >> > > > > > johan
> > > > >> > > > > >
> > > > >> > > > > >
> > > > >> > > > > >
> > > > >> > > > > > On 3/7/06, Ari Suutari <[EMAIL PROTECTED] >
> > wrote:
> > > > >> > > > > > > Hi,
> > > > >> > > > > > >
> > > > >> > > > > > > But simple validation is already on wicket level. Of
> > course
> > > > we
> > > > >> could
> > > > >> > > > > > > argue on this, but I really think that right place
> for
> > > > simple
> > > > >> > > > > > > input "cleanup" is the user interface layer:
> > > > >> > > > > > >
> > > > >> > > > > > > - Let's say I have a model, which has field called
> > "code".
> > > > >> > > > > > > - If user types new value for this in a field, I (and
> > even
> > > > user,
> > > > >> I
> > > > >> > > think)
> > > > >> > > > > > > excepts that invisible blanks at end of "code" are
> > > > removed. It
> > > > >> is
> > > > >> > > > > > > very easy to accidentally put them there with copy
> &
> > > > paste,
> > > > >> for
> > > > >> > > example.
> > > > >> > > > > > > - However, if I code something like this: m.setCode
> ("ZAP
> > > > "); I
> > > > >> > > sure
> > > > >> > > > > > > except that it is stored excactly as I wrote.
> > > > >> > > > > > >
> > > > >> > > > > > > Besides, who it would harm if TextField & TextArea
> had a
> > > > flag
> > > > >> > > > > > > like this ? Nobody forces one to use it.
> > > > >> > > > > > >
> > > > >> > > > > > > Ari S.
> > > > >> > > > > > >
> > > > >> > > > > > > ----- Original Message -----
> > > > >> > > > > > > From: "Johan Compagner" <[EMAIL PROTECTED]>
> > > > >> > > > > > > To: < [email protected]>
> > > > >> > > > > > > Sent: Tuesday, March 07, 2006 11:35 AM
> > > > >> > > > > > > Subject: Re: [Wicket-user] TextField and trimming
> blanks
> > at
> > > > end
> > > > >> (and
> > > > >> > > maybe at beginning)
> > > > >> > > > > > >
> > > > >> > > > > > >
> > > > >> > > > > > > a trim flag on what?
> > > > >> > > > > > > Form component?
> > > > >> > > > > > > I don't like that what does it do for non text
> fields?
> > > > >> > > > > > >
> > > > >> > > > > > > trimming should belong in a model. For example a
> > > > ModelWrapper
> > > > >> where
> > > > >> > > you put
> > > > >> > > > > > > youre real models in.
> > > > >> > > > > > >
> > > > >> > > > > > > johan
> > > > >> > > > > > >
> > > > >> > > > > > >
> > > > >> > > > > > > On 3/7/06, Ari Suutari < [EMAIL PROTECTED]>
> > > > wrote:
> > > > >> > > > > > > >
> > > > >> > > > > > > > Hi,
> > > > >> > > > > > > >
> > > > >> > > > > > > > setTrimValue flag would be great (maybe there
> should be
> > > > >> settings
> > > > >> > > > > > > > for left/right trim ?).
> > > > >> > > > > > > >
> > > > >> > > > > > > > Model might be also a working solution, but somehow
> I
> > > > feel
> > > > >> that
> > > > >> > > > > > > > this kind of task belongs to upper layer.
> > > > >> > > > > > > >
> > > > >> > > > > > > > Ari S.
> > > > >> > > > > > > >
> > > > >> > > > > > > > ----- Original Message -----
> > > > >> > > > > > > > From: "Igor Vaynberg" < [EMAIL PROTECTED]>
> > > > >> > > > > > > > To: <
> > [email protected] >
> > > > >> > > > > > > > Sent: Monday, March 06, 2006 7:11 PM
> > > > >> > > > > > > > Subject: Re: [Wicket-user] TextField and trimming
> > blanks
> > > > at
> > > > >> end
> > > > >> > > (and maybe
> > > > >> > > > > > > > at beginning)
> > > > >> > > > > > > >
> > > > >> > > > > > > >
> > > > >> > > > > > > > this should be a flag on the textfield so you can
> call
> > > > >> > > > > > > > setTrimValue(boolean)
> > > > >> > > > > > > > what do others think?
> > > > >> > > > > > > >
> > > > >> > > > > > > > if not you can write a model that trims for you on
> > > > setObject()
> > > > >> > > > > > > >
> > > > >> > > > > > > > -Igor
> > > > >> > > > > > > >
> > > > >> > > > > > > >
> > > > >> > > > > > > > On 3/6/06, Ari Suutari <
> [EMAIL PROTECTED]>
> > > > wrote:
> > > > >> > > > > > > > >
> > > > >> > > > > > > > > Hi,
> > > > >> > > > > > > > >
> > > > >> > > > > > > > > What might be the simplest way to change
> behaviour of
> > > > whole
> > > > >> > > wicket
> > > > >> > > > > > > > > application
> > > > >> > > > > > > > > so that TextField have their input trimmed of
> blanks
> > at
> > > > end
> > > > >> ?
> > > > >> > > > > > > > >
> > > > >> > > > > > > > > I tried to do this via converters (I have my own
> > > > converter
> > > > >> > > factory),
> > > > >> > > > > > > > > but it didn't work because Converter.convertdoesn't
> > do
> > > > >> anything
> > > > >> > > > > > > > > if String is being assigned to String field in
> model
> > > > (it
> > > > >> uses
> > > > >> > > > > > > > > isAssignableFrom
> > > > >> > > > > > > > > for this check).
> > > > >> > > > > > > > >
> > > > >> > > > > > > > > Ari S.
> > > > >> > > > > > > > >
> > > > >> > > > > > > > >
> > > > >> > > > > > > > >
> > > > >> > > > > > > > >
> > > > >> > > > > > > > >
> > > > >> > >
> > -------------------------------------------------------
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> > > > >>
> > > >
> > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642
> > > > >> > > > > > > > >
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