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Re: AbstractQuantity's class
- From: Werner Keil <
>
- To: "
" <
>
- Subject: Re: AbstractQuantity's class
- Date: Tue, 16 Sep 2014 00:28:32 +0200
What exactly should "Quantities" be, a facade like "MonetaryAmounts", etc.
from JavaMoney??
If it was to replace BaseQuantity, that is not a name for a concrete class
I'm afraid. The TemporalAmount used in JSR 310 is actually a
TemporalAmounts (since it represents more than a single amount) but if we
had
Quantities extends AbstractQuantity or
Quantities implements Quantity??
java.util.Collections does not implement java.util.Collection either, it is
merely a facade, no need for an of() there[?]
So what you suggested would be a facade along the lines of what Anatole
mentioned, but it cannot replace AbstractQuantity.
Class.of() returns an instance of that class, so a Quantities facade could
offer a method like
Quantities.getQuantityFactory(), but it can't extend or implement
Quantity, nor return a Quantity as such via of().
Regards,
Werner
On Mon, Sep 15, 2014 at 11:40 PM, Jean-Marie Dautelle
<
>
wrote:
>
Hi All,
>
Indeed, JScience use Amount but with a different semantics (using that
>
same name would create for me a headache due to name clashing).
>
It should be noted that Amount has to be a class (not an interface) in
>
order to provide static factory method (Java 7).
>
Usually (at least in JScience), you will have something like Amount
>
(interface) and Amounts with terminating s for the class holding static
>
factory method to produce Amount instances.
>
But since you intend to return Quantity types, I would suggest using
>
Quantities.of(100d, SI.METRE) - That would be consistent with standard
>
practices.
>
Best regards,
>
Jean-Marie.
>
>
>
On Mon, Sep 15, 2014 at 9:51 PM, Werner Keil
>
<
>
>
wrote:
>
>
> Dear Experts,
>
>
>
> If you don't see a conflict between a more general "Amount" class here
>
> and other types in different value-oriented APIs like JSR 354, we may take
>
> the inspiration by the likes of JScience or ICU4J, both using *Amount for
>
> such types.
>
>
>
> ICU4J combines it with things like "Currency" in
>
> http://icu-project.org/apiref/icu4j/com/ibm/icu/util/CurrencyAmount.html
>
> the other concrete class is even called "TimeUnitAmount", but I would not
>
> really see any of those as proper additions either.
>
>
>
> How do you intend to use the "faster" quantity sub-types, currently all
>
> returned by factory methods in AbstractQuantity?
>
> The "Amount" type like e.g. that in ICU4J (there it is named Measure, but
>
> unlike JSR 363 it does not separate between API and implementation, so
>
> everything are classes) holds a Number, so in theory using different
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> concrete number sub-classes would work for
>
> Amount.of(100d, SI.METRE) as opposed to
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> Amount.of(BigDecimal.TEN, SI.METRE) could handle that all.
>
>
>
> What about alternate classes with a lower footprint, especially in SE?
>
> Actually they might matter more, but if using objects like Double, Integer
>
> or Long worked equally well under ME, we could and should keep that in
>
> sync, with the exception of BigDecimal/BigInteger[?]
>
>
>
> Martin, others WDYT?
>
>
>
> Regards,
>
> Werner
>
>
>
> On Mon, Sep 15, 2014 at 9:07 PM, Otávio Gonçalves de Santana <
>
>
>
>
> wrote:
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>
>
>> Amount.of() sounds good.
>
>> On Sep 15, 2014 4:04 PM, "Legrand, Karen"
>
>> <
>
>
>> wrote:
>
>>
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>>> -1 for QuantityAmount. It looks very odd to have two nouns that are
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>>> essentially synonyms together like that. I think it would be much better
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>>> to
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>>> use either ‘Quantity’ or ‘Amount’ by itself.
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>>>
>
>>>
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>>>
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>>>
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>>>
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>>>
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>>>
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>>> *From:* Leonardo Lima
>
>>> [mailto:
]
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>>> *Sent:* Monday, September 15, 2014 10:44 AM
>
>>> *To:*
>
>>>
>
>>> *Subject:* Re: AbstractQuantity's class
>
>>>
>
>>>
>
>>>
>
>>> QuantityAmount sounds redundant, doesn't it?
>
>>>
>
>>>
>
>>>
>
>>> On Sun, Sep 14, 2014 at 9:03 PM, Otávio Gonçalves de Santana <
>
>>>
>
>
>>> wrote:
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>>>
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>>> Actually I would like to work this and in Lambda expressions.
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>>>
>
>>>
>
>>>
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>>> Could be QuantityAmount then?
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>>>
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>>> anyone?
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>>>
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>>>
>
>>>
>
>>> On Sun, Sep 14, 2014 at 6:06 PM, Werner Keil
>
>>> <
>
>
>>> wrote:
>
>>>
>
>>> Since we drop the .org domain soon, I would not call that UOMo (the
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>>> Eclipse project certainly will keep the name, after all it also support
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>>> UCUM which has another .org domain, too)
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>>>
>
>>> Why would Quantities get an of() method? What would be imaginable is
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>>> some sort of factory/facade in RI or SE, but except a
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>>> getInstance(Length.class) similar to the current QuantityFactory class
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>>> (it's a singleton returning exactly one instance here, see MEEP or CLDC8,
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>>> they also use both of() and getInstance() for each purpose, just like
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>>> Josh
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>>> Bloch explained) there is nothing to be of() in this case.
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>>>
>
>>>
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>>>
>
>>> QuantityAmount sounds like a good alternative of these, let's see at
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>>> JavaOne, probably in Hackergarten what's best.
>
>>>
>
>>>
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>>>
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>>>
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>>>
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>>> On Sun, Sep 14, 2014 at 9:01 PM, Otávio Gonçalves de Santana <
>
>>>
>
>
>>> wrote:
>
>>>
>
>>> I am not referring if the classe be or not be abstract or design, but
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>>> just the name, I am talking about the nomenclature.
>
>>>
>
>>>
>
>>>
>
>>> Could be a good name:
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>>>
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>>> - UOMO.of(...)
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>>>
>
>>> another one is:
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>>>
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>>> - Quantities.of(...)
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>>>
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>>> or the classic:
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>>>
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>>> - QuantityAmount.of(...)
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>>>
>
>>>
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>>>
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>>> On Sun, Sep 14, 2014 at 2:51 PM, Werner Keil
>
>>> <
>
>
>>> wrote:
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>>>
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>>> Sorry, no more Measurable, please
>
>>>
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>>> We've been there once.
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>>>
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>>>
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>>>
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>>> You bet Spring was probably created a while ago and may not follow all
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>>> patterns we may see now
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>>>
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>>>
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>>>
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>>> Something else e.g. QuantityAmount<Q extends Quantity> extends
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>>> AbstractQuantity<Q> is worth considering, like in UOMo.
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>>>
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>>>
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>>>
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>>> And the subsequent of() methods may be on such a concrete class.
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>>>
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>>> If you look at let's say the Collections API, it shows a similar
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>>> pattern of
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>>>
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>>> Interface > AbstractBaseClass > ConcreteClass.
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>>>
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>>>
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>>>
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>>> This "author" may not have done everything consistently there, see
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>>> EnumSet, but other than that it is still a better piece of API than let's
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>>> say 310 with hundreds of methods on final classes that are largely
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>>> incompatible and a TemporalAmount which actually should be called
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>>> TemporalAmounts, TemporalAmountCollection or whatever
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>>>
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>>>
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>>>
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>>>
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>>>
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>>> On Sun, Sep 14, 2014 at 8:32 AM, Werner Keil
>
>>> <
>
>
>>> wrote:
>
>>>
>
>>> Sorry but we had that confusion with JSR 275, so ONE Measurement is
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>>> enough, we must not have Measure implements Measurement, that would just
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>>> be
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>>> a mess.
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>>>
>
>>>
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>>>
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>>> JScience called that "Amount", but you see a lot of very popular
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>>> projects (SpringFramework) doing exactly the same. There are
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>>> Abstract*.valueOf() or similar constructions.
>
>>>
>
>>>
>
>>>
>
>>> Regards,
>
>>>
>
>>> Werner
>
>>>
>
>>>
>
>>> Werner Keil | JCP Executive Committee Member, JSR 363 Co Spec Lead |
>
>>> Eclipse UOMo Lead, Babel Language Champion | Apache Committer | Java
>
>>> Godfather
>
>>>
>
>>> Twitter @wernerkeil | @UnitAPI | @JSR354 | #EclipseUOMo | #Java_Social
>
>>> | #DevOps
>
>>>
>
>>> Skype werner.keil | Google+ gplus.to/wernerkeil
>
>>>
>
>>>
>
>>>
>
>>> * JavaZone 2014: 9-11 Sep 2014, Oslo, Norway. Werner Keil, JCP EC
>
>>> Member, JSR 363 Spec Lead will present "JSR 363 - The Answer to Life
>
>>> Science and the Internet of Everything"
>
>>>
>
>>>
>
>>>
>
>>> * JavaOne 2014: Sep 30, San Francisco, USA, Werner Keil, JCP EC Member,
>
>>> JSR 354 EG Member will host "Java and Digital Currencies, Friend or FOE"
>
>>>
>
>>>
>
>>>
>
>>> * JMaghreb 3.0: 4-6 Nov 2014, Casablanca, Morocco. Werner Keil, JCP EC
>
>>> Member, JSR 363 Spec Lead, DevOps Guy will present "Triple-E' class
>
>>> DevOps", "JSR 363"
>
>>>
>
>>> * ApacheCon Europe: 17 Nov 2014, Budapest, Hungary. Werner Keil, JCP EC
>
>>> Member, Apache DeviceMap Committer will present "Apache DeviceMap"
>
>>>
>
>>>
>
>>>
>
>>> * Mobile Developer Conference kompakt: 18 Nov 2014, Hamburg, Germany.
>
>>> Werner Keil, JCP EC Member, Apache DeviceMap Committer will present
>
>>> "Apache
>
>>> DeviceMap" (GER)
>
>>>
>
>>>
>
>>>
>
>>> On Sun, Sep 14, 2014 at 12:29 PM, Otávio Gonçalves de Santana <
>
>>>
>
>
>>> wrote:
>
>>>
>
>>> Hi Guys.
>
>>>
>
>>> How is going?
>
>>>
>
>>>
>
>>>
>
>>> I believe we have a possible problem with nomeclature in
>
>>> AbstractQuantity's class, looking this example:
>
>>>
>
>>>
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>>>
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>>> Quantity<Length> metre = AbstractQuantity.of(10, SI.METRE);
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>>>
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>>> Quantity<Length> foot = metre.to(US.FOOT);
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>>>
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>>>
>
>>>
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>>> IMHO, Abstract* is not a good name to a factory, maybe just Measure, so
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>>> will:
>
>>>
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>>>
>
>>>
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>>> Quantity<Length> metre = Meansure.of(10, SI.METRE);
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>>>
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>>> Quantity<Length> foot = metre.to(US.FOOT);
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>>>
>
>>>
>
>>>
>
>>> WDYF?
>
>>>
>
>>>
>
>>>
>
>>> --
>
>>>
>
>>> Otávio Gonçalves de Santana
>
>>>
>
>>>
>
>>>
>
>>> blog: http://otaviosantana.blogspot.com.br/
>
>>>
>
>>> twitter: http://twitter.com/otaviojava
>
>>>
>
>>> site: *http://about.me/otaviojava <http://about.me/otaviojava>*
>
>>>
>
>>> 55 (11) 98255-3513
>
>>>
>
>>>
>
>>>
>
>>>
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>>>
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>>>
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>>>
>
>>>
>
>>>
>
>>> --
>
>>>
>
>>> Otávio Gonçalves de Santana
>
>>>
>
>>>
>
>>>
>
>>> blog: http://otaviosantana.blogspot.com.br/
>
>>>
>
>>> twitter: http://twitter.com/otaviojava
>
>>>
>
>>> site: *http://about.me/otaviojava <http://about.me/otaviojava>*
>
>>>
>
>>> 55 (11) 98255-3513
>
>>>
>
>>>
>
>>>
>
>>>
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>>>
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>>>
>
>>>
>
>>>
>
>>>
>
>>> --
>
>>>
>
>>> Otávio Gonçalves de Santana
>
>>>
>
>>>
>
>>>
>
>>> blog: http://otaviosantana.blogspot.com.br/
>
>>>
>
>>> twitter: http://twitter.com/otaviojava
>
>>>
>
>>> site: *http://about.me/otaviojava <http://about.me/otaviojava>*
>
>>>
>
>>> 55 (11) 98255-3513
>
>>>
>
>>>
>
>>>
>
>>>
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>>>
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>>>
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>>>
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>>>
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>>>
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>>> --
>
>>>
>
>>> Otávio Gonçalves de Santana
>
>>>
>
>>>
>
>>>
>
>>> blog: http://otaviosantana.blogspot.com.br/
>
>>>
>
>>> twitter: http://twitter.com/otaviojava
>
>>>
>
>>> site: *http://about.me/otaviojava <http://about.me/otaviojava>*
>
>>>
>
>>> 55 (11) 98255-3513
>
>>>
>
>>>
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>>>
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>>>
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>>>
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>>
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>
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>
>
--
>
It is not the strongest of the species that survives, nor the most
>
intelligent. It is the one that is most adaptable to change. - Darwin's
>
Origin of Species (digest)
>



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