Re: I don't understand how SortedList and TableComparatorChooser work together

Thanks for you answer James, this is clear now.

I see that a comparator is added to my sorted list and the comparator wraps
my table format!

One final question if you will. Once I've clicked on a column header, I
would like to deselect that column header so that my sorted list (and hence
JTable view of it) goes back to original sorting behaviour. Does anyone know
of a way to do this?

Thanks, Nick.

James Lemieux wrote:
>
> Nick,
>
> "The TableComparatorChooser isn't swapping out the Comparator on my
> SortedList, it is using the Comparator of whatever my TableFormat returns
> for that column."
>
> This is a false statement. The Comparator of whatever your TableFormat
> returns for a column is set as the Comparator of the SortedList. It may be
> combined with other Comparators (for multi column sorting) and it may be
> wrapped to reverse its natural sort direction, but ultimately your column
> Comparators are used as the Comparator on your SortedList. If you're still
> unconvinced, look at AbstractTableComparatorChooser.rebuildComparator():
>
>     protected void rebuildComparator() {
>         final Comparator<E> rebuiltComparator =
> sortingState.buildComparator();
>
>         // select the new comparator
>         sortedList.getReadWriteLock().writeLock().lock();
>         try {
>             sortedListComparator = rebuiltComparator;
>             sortedList.setComparator(rebuiltComparator);
>         } finally {
>             sortedList.getReadWriteLock().writeLock().unlock();
>         }
>     }
>
> If you still have questions at this point, post them back and I'll answer
> them.
>
> James
>
> On Fri, May 1, 2009 at 12:32 AM, Boomah <nickdarcy@...> wrote:
>
>>
>> Thanks for the answers but I'm still unsure (this is my fault for not
>> explaining properly). Let me try again:
>>
>> The TableComparatorChooser isn't swapping out the Comparator on my
>> SortedList, it is using the Comparator of whatever my TableFormat returns
>> for that column. This is a field in an object contained in my SortedList.
>> So
>> as soon as I click on a column to sort, the SortedList is no longer used,
>> and could just as easily be replaced by an EventList.
>>
>> I agree with point c) mentioned below. After I had clicked on a column, I
>> might want to revert back to the order that the SortedList says the table
>> should display data in. I can't figure out how to do this though. It
>> doesn't
>> seem I can deselected a column sorting. Is this possible?
>>
>> So my main point is this: Why does the method
>> TableComparatorChooser.install
>> take a SortedList when it seems to me that taking an EventList would be
>> just
>> as legitimate.
>>
>> Thanks for any clarification,
>>
>> Nick.
>>
>>
>>
>>
>> James Lemieux wrote:
>> >
>> > Kevin is correct.
>> >
>> > SortedList is a transformation used to create an ordered *view* of any
>> > EventList.
>> >
>> > TableComparatorChooser is simply a big fancy way to interpret mouse
>> clicks
>> > on a column header as a change in the Comparator of a SortedList.
>> >
>> > If the original question posed in this Thread is essentially "why don't
>> > you
>> > just sort data in place, why do you have sorted "views" at all?" that's
>> a
>> > really long winded explanation. Some quick but obvious reasons include:
>> >
>> > a) what if I want 2 different sorted views of the same data?
>> > b) what if the original order has special meaning to my app, and
>> shouldn't
>> > be disturbed?
>> > c) how can I return to the original order after it has been disturbed?
>> >
>> > etc.
>> >
>> > James
>> >
>> > On Thu, Apr 30, 2009 at 11:00 AM, Kevin Day <kevin@...>
>> wrote:
>> >
>> >>  I'm pretty sure that TableComparitorChooser is actually swapping out
>> the
>> >> comparator on your sorted list.
>> >>
>> >> - K
>> >>
>> >>
>> >>  ----------------------- *Original Message* -----------------------
>> >>
>> >> *From:* Boomah <nickdarcy@...> <nickdarcy@...>
>> >> *To:* users@...
>> >> *Cc:*
>> >> *Date:* Thu, 30 Apr 2009 10:41:56 -0700 (PDT)
>> >> *Subject: I don't understand how SortedList and TableComparatorChooser
>> >> work together*
>> >>
>> >>
>> >> Hi people. I don't understand how SortedList and
>> TableComparatorChooser
>> >> work
>> >> together.
>> >>
>> >> I have objects that get added to a SortedList that represent (via my
>> >> TableFormat) a row in a table. The SortedList uses this object to
>> sort,
>> >> and
>> >> if I just use a standard JTable, whenever an object is added to my
>> list,
>> >> it
>> >> gets added to my table in the appropriate position. Everything works
>> >> exactly
>> >> as I would expect.
>> >>
>> >> Now I install a TableComparatorChooser on my JTable. If I start my
>> >> application, I see items being added to the table in the correct
>> position
>> >> given my SortedList as before. However, if I now click on one of the
>> >> columns, it sorts not using my SortedList but by using the objects in
>> the
>> >> column I clicked on. In my case they are all strings and so get sorted
>> >> using
>> >> the standard string comparator.
>> >>
>> >> I don't understand why the TableComparatorChooser requires a
>> SortedList
>> >> if
>> >> once the user clicks on a column, it gets sorted by th e objects it
>> >> contains.
>> >> Why isn't it possible to use an EventList?
>> >>
>> >> It feels like I'm missing something obvious, but I think that
>> SortedList
>> >> and
>> >> TableComparatorChooser completely work against each other and should
>> be
>> >> separated.
>> >>
>> >> Have I completely missed the point?
>> >>
>> >> Thanks, Nick.
>> >>
>> >>
>> >> --
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>> >> Sent from the GlazedLists - User mailing list archive at Nabble.com.
>> >>
>> >>
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