* Reflection
@ 2017-09-27 14:56 Peter
2017-09-27 15:29 ` Reflection Per Bothner
0 siblings, 1 reply; 4+ messages in thread
From: Peter @ 2017-09-27 14:56 UTC (permalink / raw)
To: kawa mailing list
Hello fellow Kawa programmers!
I'm trying to reflect on Classes, however, I'm running into some
problems:
> ("foo":getClass)
class java.lang.String
> (("foo":getClass):getCanonicalName)
; Evaluation aborted on java.lang.RuntimeException: no applicable method named `getCanonicalName' in java.lang.String.
> (java.lang.String:getCanonicalName)
; Evaluation aborted on java.lang.RuntimeException: no such field getCanonicalName in java.lang.String.
> (<java.lang.String>:getCanonicalName)
; Evaluation aborted on java.lang.RuntimeException: no such field getCanonicalName in java.lang.String.
How do I correctly use reflection (for finding methods and fields etc.)?
Thanks for any help!
Peter
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Reflection
2017-09-27 14:56 Reflection Peter
@ 2017-09-27 15:29 ` Per Bothner
2017-09-27 15:35 ` Reflection Jamison Hope
0 siblings, 1 reply; 4+ messages in thread
From: Per Bothner @ 2017-09-27 15:29 UTC (permalink / raw)
To: Peter, kawa mailing list
On 09/27/2017 07:55 AM, Peter wrote:
> I'm trying to reflect on Classes, however, I'm running into some
> problems:
>
>> ("foo":getClass)
> class java.lang.String
>> (("foo":getClass):getCanonicalName)
> ; Evaluation aborted on java.lang.RuntimeException: no applicable method named `getCanonicalName' in java.lang.String.
>> (java.lang.String:getCanonicalName)
> ; Evaluation aborted on java.lang.RuntimeException: no such field getCanonicalName in java.lang.String.
>> (<java.lang.String>:getCanonicalName)
> ; Evaluation aborted on java.lang.RuntimeException: no such field getCanonicalName in java.lang.String.
This is explained in
https://www.gnu.org/software/kawa/Colon-notation.html
However, that doesn't say what to do instead. (I'm adding a note for that.)
Basically, if the "receiver" (this) argument is a Class then you can't use
colon notation, but you can use the invoke procedure:
(invoke ("foo":getClass) 'getCanonicalName)
--
--Per Bothner
per@bothner.com http://per.bothner.com/
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Reflection
2017-09-27 15:29 ` Reflection Per Bothner
@ 2017-09-27 15:35 ` Jamison Hope
2017-09-27 15:56 ` Reflection Peter
0 siblings, 1 reply; 4+ messages in thread
From: Jamison Hope @ 2017-09-27 15:35 UTC (permalink / raw)
To: kawa mailing list
On Wed, September 27, 2017 11:28 am, Per Bothner wrote:
> On 09/27/2017 07:55 AM, Peter wrote:
>> I'm trying to reflect on Classes, however, I'm running into some
>> problems:
>>
>>> ("foo":getClass)
>> class java.lang.String
>>> (("foo":getClass):getCanonicalName)
>> ; Evaluation aborted on java.lang.RuntimeException: no applicable method
>> named `getCanonicalName' in java.lang.String.
>>> (java.lang.String:getCanonicalName)
>> ; Evaluation aborted on java.lang.RuntimeException: no such field
>> getCanonicalName in java.lang.String.
>>> (<java.lang.String>:getCanonicalName)
>> ; Evaluation aborted on java.lang.RuntimeException: no such field
>> getCanonicalName in java.lang.String.
>
> This is explained in
> https://www.gnu.org/software/kawa/Colon-notation.html
>
> However, that doesn't say what to do instead. (I'm adding a note for
> that.)
>
> Basically, if the "receiver" (this) argument is a Class then you can't use
> colon notation, but you can use the invoke procedure:
>
> (invoke ("foo":getClass) 'getCanonicalName)
Using "*:" notation works, too:
(*:getCanonicalName ("foo":getClass))
--
Jamison Hope
jrh@theptrgroup.com
^ permalink raw reply [flat|nested] 4+ messages in thread
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