Mailing-List: contact commons-dev-help@jakarta.apache.org; run by ezmlm
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Subject: RE: [collections] New Collection
Date: Fri, 19 Sep 2003 09:10:55 -0400
Message-ID: <9C5166762F311146951505C6790A9CF8A6EC28@US-VS1.corp.mpi.com>
Thread-Topic: [collections] New Collection
Thread-Index: AcN+rtNFr1YXhV+yRVW3O8igQa+4qAAAJPmQ
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>


Howdy,
Attach it an enhancement request in Bugzilla.  And an accompanying tes=
t case would be very nice ;)

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Oxley, David [mailto:David.Oxley@workplace-systems.plc.uk]
>Sent: Friday, September 19, 2003 8:52 AM
>To: 'Jakarta Commons Developers List'
>Subject: RE: [collections] New Collection
>
>Ok. The list won't accept the attachment. If anyone wants to review i=
t, I
>will email it to you directly.
>Dave.
>
>-----Original Message-----
>From: Oxley, David [mailto:David.Oxley@workplace-systems.plc.uk]
>Sent: Friday, September 19, 2003 1:29 PM
>To: 'Jakarta Commons Developers List'
>Subject: RE: [collections] New Collection
>
>Sorry, my patch went missing. Too big? Anyway here it is gzipped.
>Dave
>-----Original Message-----
>From: Oxley, David [mailto:David.Oxley@workplace-systems.plc.uk]
>Sent: Friday, September 19, 2003 1:16 PM
>To: 'commons-dev@jakarta.apache.org'
>Subject: RE: [collections] New Collection
>That's what I meant, cheers.
>I found another collection that seems to be a better starting point,
>org.apache.commons.collections.DoubleOrderedMap. So far I have made a=

>couple
>of changes to this class:
>1. Changed it to use Comparator's if specified rather than natural
>ordering.
>
>2. Transaction support.
>I have attached an initial patch. This is NOT for committing as I hav=
en't
>finished yet.
>I have a few questions:
>1. Once I've finished, will the patch be applied (based on what I've
>already
>done)?
>2. Roughly when is the next release of Commons-Collections?
>3. There are no decorators specifically for DoubleOrderedMap. Should =
I
>write
>some?
>Cheers,
>Dave.
>-----Original Message-----
>From: Arun Thomas <Arun.Thomas@solidusnetworks.com>
>Sent: Fri, 12 Sep 2003 10:19:03 -0700
>To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org=
>
>Subject: [collections] New Collection
>Right....
>That seems to be a good interpretation of the original intent.=A0 Sho=
uld have
>read the original a little better the first time.
>-AMT
>-----Original Message-----
>From: james@carmanconsulting.com [mailto:james@carmanconsulting.com]
>Sent: Friday, September 12, 2003 9:13 AM
>To: commons-dev@jakarta.apache.org
>Subject: Re: [collections] New Collection
>The only problem with SequencedHashMap is that its ordering is based =
upon
>the insertion order, not the values of the objects added to it or som=
e
>Comparator, such as is needed (at least that's how I interpret "order=
ing by
>value" from the original requirements).
>----- Original Message -----
>From: "Arun Thomas" <Arun.Thomas@solidusnetworks.com>
>To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org=
>
>Sent: Friday, September 12, 2003 12:04 PM
>Subject: RE: [collections] New Collection
>You might want to take a look at
>org.apache.commons.collections.SequencedHashMap which combines, for t=
he
>most
>part, the functions of list and map (insertElementAt()) is not availa=
ble -
>how does one insert a key, when the value should be at a specific pos=
ition?
>The transactional support is definitely not there, but this might giv=
e you
>a
>better starting point for what you desire.
>-AMT
>-----Original Message-----
>From: Oxley, David [mailto:David.Oxley@workplace-systems.plc.uk]
>Sent: Friday, September 12, 2003 8:07 AM
>To: 'commons-dev@jakarta.apache.org'
>Subject: [collections] New Collection
>Our application has just changed from requiring JDK 1.1 to JDK 1.3 as=
 a
>minimum. As a result we are looking at switching our implementation o=
f
>using
>Hashtable and Vector to using collections.
>I am going to write a new collection that gives the functionality we
>require
>and once I've finished I want to donate it to commons-collections. I =
would
>like some comments on where to start (especially as I don't yet know =
too
>much about the standard collections API's). The functionality I requi=
re is
>this: 1. Keys and values. ala Hashtable. 2. Ordering by value. ala Ve=
ctor.
>3. Indexing by value. ala Vector's indexOf, elementAt and insertEleme=
ntAt.
>4. Transactions. i.e. Others won't see changes until commit is called=
.
>I take it there is no implementation that supplies the above. I was
>initially thinking of either encapsulating or overriding TreeMap, but=
 I
>think that would make the indexing part pretty difficult. But now I t=
hink I
>will just encapsulate or override HashMap.
>Any comments would be gratefully received.
>Cheers.
>Dave.
>david.oxley@workplace-systems.plc.uk
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