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Groups > comp.lang.java.programmer > #13123

Re: JSTL: getting a map's keys

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On 3/22/2012 9:51 AM, Lew wrote:
> Chris Riesbeck wrote:
>> Lew wrote:
>>> - If you had *composed* a 'Map' into a custom class rather than
>>> inheriting 'Map', you would not have had the problem. Your custom
>>> class would have been resolved by the bean resolver. - This in turn
>>> would make for a better design overall. Instead of your view artifact
>>> (the JSP) caring about the implementation details of the map and its
>>> set of keys, you'd have a controller call like 'getKeys()' or
>>> whatever that would cleanly separate the logic of how you get them
>>> from presentation concerns.
>>
>> Using delegation (my preference also) doesn't support the JSP EL form
>> ${rates["Bill"]}. If I had a custom class, I'd need a custom tag or
>> custom EL
>> resolver to make that work.
>
> No, you most certainly would not.
>
> Just define an appropriate method in your class.

Color me totally dense. Maybe I'm missing what method I should be defining.

If my class implements the Map interface, then MAPElResolver will be 
invoked and do the same thing with name.key and name["key"]: call 
name.get("key"). The JSP EL won't be able to call any bean method of name.

If my class doesn't implement Map, then BeanELResolver will be invoked 
and do the same thing with name.key and name["key"]: call name.getKey(). 
The JSP EL won't be able to call name.get() via [].

So I don't see how I can have a class such that in the JSP EL I can call 
a method to get all the keys, and also retrieve data with a key using [].

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Thread

JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-19 13:15 -0500
  Re: JSTL: getting a map's keys Lew <lewbloch@gmail.com> - 2012-03-19 12:57 -0700
  Re: JSTL: getting a map's keys Tim Slattery <Slattery_T@bls.gov> - 2012-03-19 16:08 -0400
    Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-19 16:06 -0500
      Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-19 16:39 -0500
    Re: JSTL: getting a map's keys markspace <-@.> - 2012-03-19 15:27 -0700
  Re: JSTL: getting a map's keys Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-19 16:59 -0700
    Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-20 12:19 -0500
      Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-20 12:52 -0500
        Re: JSTL: getting a map's keys Lew <lewbloch@gmail.com> - 2012-03-20 11:05 -0700
          Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-21 13:09 -0500
            Re: JSTL: getting a map's keys Lew <noone@lewscanon.com> - 2012-03-22 07:51 -0700
              Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-22 12:53 -0500
                Re: JSTL: getting a map's keys Lew <lewbloch@gmail.com> - 2012-03-22 13:23 -0700
                Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-23 12:23 -0500
                Re: JSTL: getting a map's keys Lew <noone@lewscanon.com> - 2012-03-23 13:50 -0700
                Re: JSTL: getting a map's keys Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-03-26 14:10 -0500
        Re: JSTL: getting a map's keys Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-20 11:28 -0700
        Re: JSTL: getting a map's keys markspace <-@.> - 2012-03-20 11:29 -0700
          Re: JSTL: getting a map's keys Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-20 12:10 -0700

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