A little confused about the component rendering

[Chris Norris <CN...@widen.com>]

Here is what I am trying to do: make a component that takes in a
java.util.Set.  Here's the main part of the component:
 
<td class="subFiller"><div jwcid="@ListEdit" source="ognl:validRolesId"
value="ognl:currentRoleId">

<input jwcid="@Checkbox" selected="ognl:roleChecked" />&nbsp;<span
jwcid="@Insert" value="ognl:currentRole.name" /><br/>

</div></td>

So the component basically edits a list of roles.  The thing is, the set
must always have at least one role in it.  I was going to make the
setRoleChecked method not allow the last role to be deleted, but that
doesn't always work.  Say, for instance, that there are 3 roles, the first
two of which are initially checked.  If a user unchecks the first two and
checks the third, this is valid.  But if I check in setRoleChecked, it won't
allow the unchecking of the 2nd role, because it doesn't know that the third
will be checked. I hope that makes sense

So my solution was to make a temporary Set to store the roles in.  If I can
populate the set via a parameter passed in when the component is first
rendered, and then operate just on the set, I should be okay.  But I would
have to use the temporary Set to modify the real Set passed in as a
parameter when the form the component is in is submitted.  So, first of all,
is my solution misguided?  I may be going about this all wrong.  If I'm on
the right path, what methods will I need to override?  Between all the
renders and beginRenders and things, I'm not sure which to use.  

Any thoughts would be appreciated.

 

-chris