--- Jim Barrows <[EMAIL PROTECTED]> escreveu:
>
>
> > -----Original Message-----
> > From: Leandro Melo
> [mailto:[EMAIL PROTECTED]
> > Sent: Wednesday, September 08, 2004 4:28 PM
> > To: Struts Users Mailing List
> > Subject: Re: ActionForm data type X BeanUtils ->
> using Dates
> >
> >
> > I got one doubt in your code when used in a
> situation
> > that i mentioned (transforming data from action
> form
> > to dto).
> > When date comes from action form, they usually
> come in
> > Strings, but in your method you verify
> >
> > value instanceof Date...
>
> Bi-directional conversion. Look at what he does if
> it is a date. This isn't just for ActionForm to
> DTO, it's for any other time you have to convert a
> string to a date using BeanUtils.
Yes Jim, "to convert a String to a Date", so if i use
value instanceof Date
i will allways fail!!! Because value is a String, you
just said that.
> > This will never happen, as the value comes in
> String.
> >
> > Am i saying something stupid???
>
> Not really... just not being generic enough for the
> solution.
>
> >
> > I'm not saying your code is wrong, but not
> appropriate
> > for the situation in question.
> >
> > Am i right?
>
> Sorta :)
>
> >
> >
> > --- Bryce Fischer <[EMAIL PROTECTED]>
> > escreveu:
> > > The custom converter is done independently of
> the
> > > action, form or DTO.
> > >
> > > First step is to implement the interface
> > > org.apache.commons.beanutils.Converter.
> > >
> > > Keep in mind that the converter you are writing
> uses
> > > the appropriate
> > > converter for the original class. So, if you
> were
> > > converting from a
> > > String to a Date, you would create a String
> > > converter. And vice versa,
> > > if you were converting from a Date to a String
> you
> > > would create a Date
> > > converter. Example below
> > >
> > > Then, to override the standard converters, you
> call:
> > > ConvertUtils.register(<Your converter class>,
> <class
> > > to use converter
> > > on>.class);
> > >
> > > First parameter is your new converter, and the
> > > second is the class its
> > > used for. I call this in a static initializer of
> a
> > > utility class, you
> > > just need to make sure its called before any
> > > validations occur, and it
> > > only needs to be done once.
> > >
> > > Since we are interested in customizing
> conversions
> > > from String to Date,
> > > I override the String converter:
> > >
> > > public class StringConverter implements
> Converter{
> > > public Object convert(Class type, Object
> value) {
> > > Object returnObj = null;
> > > if (value != null) {
> > > if (value instanceof Date){
> > > returnObj =
> > > dateFormatter.format((Date)value);
> > > } else if (value instanceof
> BigDecimal){
> > > returnObj =
> > > decimalFormatter.format((BigDecimal)value);
> > > } else {
> > > returnObj = value.toString();
> > > }
> > > }
> > >
> > > return returnObj;
> > > }
> > > }
> > >
> > > I've left out some properties, their getters and
> > > setters, but I think
> > > you get the gist of what I'm doing. Now, I
> register
> > > this converter as such:
> > >
> > > ConvertUtils.register(new StringConverter(),
> > > String.class);
> > >
> > > I actually have a utility class, where the
> register
> > > is done in the
> > > static initializer. I suppose another way would
> be
> > > to use a servlet that
> > > loads prior to Struts.. Or if your Actions have
> a
> > > base class, etc...
> > >
> > > Maybe there's a more elegant way of doing that.
> This
> > > is what I've come
> > > up with. If someone has a better way, post
> please,
> > > I'm always looking
> > > for more elegant ways of accomplishing stuff
> like
> > > this.
> > >
> > > Jason King wrote:
> > >
> > > > Could you point us at some code that does
> this?
> > > Do you customize in
> > > > the action, the form or the DTO?
> > >
> > >
> > >
> >
>
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> > >
> >
> >
> >
> >
> >
> >
>
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