Re: Example to introspect a class
Thank you
I'm still learning all the different forms so this is very helpful.
On Apr 1, 10:13 pm, Ken Wesson kwess...@gmail.com wrote:
On Fri, Apr 1, 2011 at 10:56 AM, Mushfaque Chowdhury
mushfaque.chowdh...@googlemail.com wrote:
Hi
I'm trying to solve a introspection problem of the following type
(def Region {'fields '((datatype x) (datatype y))})
(def Country {'fields '((int x) (double y {reference `Region}))})
I'd like to introspect the fields from Country and see {reference
Region} replaced by (reference ((datatype x) (datatype y)))
I can get as far as seeing this
((nth (nth (Country 'fields) 1) 2) 'reference)
which gives
(quote com.test.Common/Region)
which is sort of close, but how do I now look at it's fields?
First of all, that's not actually a class, it's a var.
Second, does it actually need to be quoted a second level?
Third, (second '(quote com.test.Common/Region)) will be the symbol
com.test.Common/Region, and if you get that symbol into a local named
foo, (ns-resolve *ns* foo) ought to yield up a Var object.
And (@that-var 'fiels} then ought to cough up '((datatype x) (datatype y)).
Indeed:
user= (def Region {'fields '((datatype x) (datatype y))})
#'user/Region
user= (def Country {'fields '((int x) (double y {reference `Region}))})
#'user/Country
user= (@(ns-resolve (find-ns 'user) (nth ((nth (nth (Country 'fields)
1) 2) 'reference) 1)) 'fields)
((datatype x)
(datatype y))
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Example to introspect a class
Hi
I'm trying to solve a introspection problem of the following type
(def Region {'fields '((datatype x) (datatype y))})
(def Country {'fields '((int x) (double y {reference `Region}))})
I'd like to introspect the fields from Country and see {reference
Region} replaced by (reference ((datatype x) (datatype y)))
I can get as far as seeing this
((nth (nth (Country 'fields) 1) 2) 'reference)
which gives
(quote com.test.Common/Region)
which is sort of close, but how do I now look at it's fields?
--
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Re: Example to introspect a class
You'd have to not back-quote Region and then eval the reseult:
user= (def Country {'fields '((int x) (double y {reference
Region}))})
#'user/Country
user= ((nth (nth (Country 'fields) 1) 2) 'reference)
Region
user= (eval ((nth (nth (Country 'fields) 1) 2) 'reference) )
{fields ((datatype x) (datatype y))}
If you want the contents of Region in Country and not its symbol:
(def Country `{fields ((int x) (double y {reference ~Region}))})
and look it up with:
((nth (nth (Country 'fields) 1) 2) 'user/reference)
(((nth (nth (Country 'fields) 1) 2) 'user/reference) 'fields)
Or to avoid the qualified names:
user= (def Country {'fields (list (list 'int 'x) (list 'double 'y
{'reference Region}))})
#'user/Country
user= ((nth (nth (Country 'fields) 1) 2) 'reference)
{fields ((datatype x) (datatype y))}
user= (((nth (nth (Country 'fields) 1) 2) 'reference) 'fields)
((datatype x) (datatype y))
On Apr 1, 7:56 am, Mushfaque Chowdhury
mushfaque.chowdh...@googlemail.com wrote:
Hi
I'm trying to solve a introspection problem of the following type
(def Region {'fields '((datatype x) (datatype y))})
(def Country {'fields '((int x) (double y {reference `Region}))})
I'd like to introspect the fields from Country and see {reference
Region} replaced by (reference ((datatype x) (datatype y)))
I can get as far as seeing this
((nth (nth (Country 'fields) 1) 2) 'reference)
which gives
(quote com.test.Common/Region)
which is sort of close, but how do I now look at it's fields?
--
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To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
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Re: Example to introspect a class
On Fri, Apr 1, 2011 at 10:56 AM, Mushfaque Chowdhury
mushfaque.chowdh...@googlemail.com wrote:
Hi
I'm trying to solve a introspection problem of the following type
(def Region {'fields '((datatype x) (datatype y))})
(def Country {'fields '((int x) (double y {reference `Region}))})
I'd like to introspect the fields from Country and see {reference
Region} replaced by (reference ((datatype x) (datatype y)))
I can get as far as seeing this
((nth (nth (Country 'fields) 1) 2) 'reference)
which gives
(quote com.test.Common/Region)
which is sort of close, but how do I now look at it's fields?
First of all, that's not actually a class, it's a var.
Second, does it actually need to be quoted a second level?
Third, (second '(quote com.test.Common/Region)) will be the symbol
com.test.Common/Region, and if you get that symbol into a local named
foo, (ns-resolve *ns* foo) ought to yield up a Var object.
And (@that-var 'fiels} then ought to cough up '((datatype x) (datatype y)).
Indeed:
user= (def Region {'fields '((datatype x) (datatype y))})
#'user/Region
user= (def Country {'fields '((int x) (double y {reference `Region}))})
#'user/Country
user= (@(ns-resolve (find-ns 'user) (nth ((nth (nth (Country 'fields)
1) 2) 'reference) 1)) 'fields)
((datatype x)
(datatype y))
--
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first post.
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