Re: adding a custom Type converter

[Cosmin Bucur <co...@gmail.com>]

So you need to configure a SqueezeAdaptor for each data object you are
using in tapestry ?

Also what's not clear to me is , does the tapestry end need to be
modified at all , or theese SqueezeAdaptors will  simply work
automatically on the existing tap4 code .

Thanks

On 12/9/05, Paul Cantrell <ca...@pobox.com> wrote:
> I've done this, and it works quite well. You need to implement the
> interface org.apache.tapestry.util.io.SqueezeAdaptor, something like
> this:
>
> public class DomainObjectSqueezeAdaptor
>     implements SqueezeAdaptor
>     {
>     public static final char PREFIX = '*';
>     private static final Pattern squeezeFormat = Pattern.compile("\\*
> ([A-Za-z0-9_\\.\\$]+)_([0-9]+)");
>
>     public String getPrefix()
>         { return String.valueOf(PREFIX); }
>
>     public Class getDataClass()
>         { return DomainObject.class; }
>
>     public String squeeze(DataSqueezer squeezer, Object data)
>         { return squeeze(data); }
>
>     public static String squeeze(Object data)
>         {
>         return PREFIX
>              + data.getClass().getName()
>              + '_'
>              + ((DomainObject) data).getId();
>         }
>
>     public DomainObject unsqueeze(DataSqueezer squeezer, String s)
>         { return unsqueeze(s); }
>
>     public static DomainObject unsqueeze(String s)
>         {
>         Matcher matcher = squeezeFormat.matcher(s);
>         if(!matcher.matches())
>             throw new IllegalArgumentException("Unable to parse
> squeezed ID: " + s);
>         String className = matcher.group(1);
>         String id = matcher.group(2);
>
>         Class type;
>         try { type = Class.forName(className); }
>         catch(ClassNotFoundException e)
>             { throw new IllegalArgumentException("Unable to parse
> squeezed ID " + s, e); }
>
>         return HibernateHelper.fromId((Class<? extends
> DomainObject>) type, id);
>         }
>     }
>
> Then add this to your hivemodule.xml:
>
>     <contribution configuration-id="tapestry.data.SqueezeAdaptors">
>       <adaptor
> object="instance:net.innig.core.web.tapestry.DomainObjectSqueezeAdaptor"
> />
>     </contribution>
>
> Cheers,
>
> Paul
>
>
> On Dec 9, 2005, at 11:45 AM, Glen wrote:
>
> > I am converting a pre-existing webapp to use Tapestry 4.0.  It uses
> > hibernate for the business objects and long's for the uid's on those
> > objects.  I would like to use tapestry to coerce from the uid as a
> > string into the actual business object
> >
> > Ultimately what I want to be able to do is to write a direct link like
> > this...
> >
> >
> > <span jwcid="@DirectLink" listener="listener:gotoDetails"
> > parameters="ognl:bizObject">view details</span>
> >
> > public void gotoDetails( BizObject bizObject ) {
> >    // rest of code goes here
> > }
> >
> > instead of how I am currently doing it as follows...
> >
> > <span jwcid="@DirectLink" listener="listener:gotoDetails"
> > parameters="ognl:bizobject.uid">view details</span>
> >
> > public void gotoDetails( Long  uid ) {
> >     BizObject bizObject = DAO.getBizObject( uid );
> > }
> >
> >
> > I know I need to use the tapestry.coerce.ValueConverter service.  Can
> > anyone point me in the right direction as to how I would implement
> > this?
> >
> >
> >
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>
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