Thanks John,
It was the idea that came to my mind first. The question is where I
can create such a wrapper? I need to have it compatible with
CompountPropertyModel... That's the sticking point. Since I cannot
store an array in my mysql database anyway I am going to implement a
subclass of CheckBoxMultipleChoice and use it most of the time.
Everything else like IChoiceRenderer and so on I have already
implemented. The only problem is where to put the conversion code. Any
ideas?
On Tue, Apr 8, 2008 at 7:36 PM, John Krasnay <[EMAIL PROTECTED]> wrote:
>
> On Tue, Apr 08, 2008 at 06:41:20PM +0200, Vitaly Tsaplin wrote:
> > Hi everyone,
> >
> > Lets say I am going to use a single integer value as a model object
> > for the component CheckBoxMultipleChoice packing the selected choices
> > somehow to this value as bits. Where can I do such a conversion? The
> > method getConvertor is not called... the methods getConvertedInput and
> > setConvertedInput are final...
> >
> > Vitaly
>
> ListMultipleChoice/CheckBoxMultipleChoice require a model that returns a
> Collection object, so your best bet is to create a model that wraps your
> integer-returning model and presents the bits as a list of integers.
> Here's some pseudocode that might help:
>
> public class BitMapModel implements IModel {
> private IModel targetModel;
> public BitMapModel(IModel targetModel) {
> this.targetModel = targetModel;
> }
>
> public Object getObject() {
> List list = new ArrayList();
> int bits = (Integer) targetModel.getObject();
> for each bit in bits:
> if bit==1:
> add bit value to list
> return list;
> }
>
> public void setObject(Object value) {
> List list = (List) value;
> int bits = 0;
> for each bit in list:
> bits |= bit;
> }
> targetModel.setObject(bits);
> }
> }
>
> For example, if targetModel.getObject() returned the 5 (i.e. bits 0101),
> this wrapper model would return the list [ 2, 0 ], and vice-versa for
> setObject.
>
> You'll also need a ChoiceRenderer to convert the bit values to
> reasonable strings.
>
> jk
>
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