11 Jul
2006
11 Jul
'06
9:09 p.m.
How would you calculate dynamically #isAbstract for a
PRCommand
for example ? If I remember correctly, for the project I've done
using Magritte/Pier/MySQL, I implemented #doExecute for an
abstract command.
Something along the lines ...
Behavior>>isAbstract
^ self allSelectors anySatisfy: [ :each |
(self lookupSelector: each)
hasLiteral: #subclassResponsibility ] ] 
11 Jul
11 Jul
9:23 p.m.
New subject: isAbstract ?
Am 11.07.2006 um 21:09 schrieb Lukas Renggli:
I think this works for real abstract classes. But it doesn't work
when the developer expect subclasses to send super and not override
particular methods.
True. Object is an example, but can't think of any other core class
that does this.
I wouldn't count Object as an example because it's not an abstract
class.
- Bert -
How would you
calculate dynamically #isAbstract for a PRCommand
for example ? If I remember correctly, for the project I've done
using Magritte/Pier/MySQL, I implemented #doExecute for an
abstract command.
Something along the lines ...
Behavior>>isAbstract
^ self allSelectors anySatisfy: [ :each |
(self lookupSelector: each)
hasLiteral: #subclassResponsibility ] ]
12 Jul
12 Jul
7:46 a.m.
New subject: isAbstract ?
I wouldn't count Object as an example because
it's not an abstract
class.
Why do you think Object is not an abstract class?
--
Lukas Renggli
http://www.lukas-renggli.ch
10:56 a.m.
New subject: isAbstract ?
Look for methods sending 'Object new' in your image. I found a few dozens
in my VASt image.
Instances of Object are often used as (temporary) unique objects.
Cheers,
Adriaan.
--
http://vdg38bis.xs4all.nl
I wouldn't
count Object as an example because it's not an abstract
class.
Why do you think Object is not an abstract class?
--
Lukas Renggli
http://www.lukas-renggli.ch
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11:30 a.m.
New subject: isAbstract ?
2006/7/12, Adriaan van Os <a3aan(a)xs4all.nl>nl>:
Look for methods sending 'Object new' in your
image. I found a few dozens
in my VASt image.
Look at all the self sends in Object that are not implemented in Object. ;)
(This may not be the case in VASt)
Philippe
12:34 p.m.
New subject: isAbstract ?
Look for methods sending 'Object new' in your
image. I found a few
dozens in my VASt image.
Yes, I know, but this is not something Object is designed for.
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch
5:08 p.m.
New subject: isAbstract ?
On Jul 12, 2006, at 6:34 AM, Lukas Renggli wrote:
Well, this is Smalltalk. There is no hard and fast definition of
"Abstract class." What if you create an instance of a class that has
methods that send #subclassResponsibility, but never call those
methods? If you have a class with a complete implementation of some
concept, but only happen to create instances of its subclasses, is it
abstract or concrete? How about a class that sends
#subclassResponsibility but answers #isAbstract with true? How many
angels can dance on the head of a pin?
For purposes of SUnit, the meaning of "abstract" is simple. A
TestCase subclass that answers #isAbstract with true will not be
included in automatically built TestSuites. It's that simple. With
that purpose in mind, the existing implementation is fine:
It works nicely for the common case - a single abstract class with
several concrete subclasses
It's simple, so that in the uncommon case of several levels of
abstract classes, the redundant implementations are easy to write and
easy to understand
If an abstract class is renamed, #isAbstract shows up as a reference,
and can be updated easily
Colin
Look for
methods sending 'Object new' in your image. I found a few
dozens in my VASt image.
Yes, I know, but this is not something Object is designed for. 
13 Jul
13 Jul
7:31 p.m.
New subject: [Smallwiki] Re: isAbstract ?
I get an error when loading the latest Pier-Seaside package lr.74
UndefinedObject does not Understand #isSeparator.
Keith
p.s. I am using 3.8-6665
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7:51 p.m.
New subject: UndefinedObject does not Understand #isSeparator.
I get an error when loading the latest Pier-Seaside
package lr.74
UndefinedObject does not Understand #isSeparator.
What is the stack-trace?
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch
6766
days inactive
6768
days old
8 comments
6 participants
participants (6)
-
Adriaan van Os -
Bert Freudenberg -
Colin Putney -
Keith Hodges -
Lukas Renggli -
Philippe Marschall