Hi Nicolas, sorry, that last post missed the second part, I meant to add; If you know the method you wish to call, do you not know the class and can thus call the static method directly?
-Adrian. On Tue, Jul 7, 2009 at 5:21 AM, Adrian Cuthbertson < adrian.cuthbert...@gmail.com> wrote: > You can call the static method directly on the class name; > > (java.nio.ByteBuffer/allocate 1024) > > or just (ByteBuffer/allocat 1024) > if it's imported. > > Rgds, Adrian. > > > On Tue, Jul 7, 2009 at 2:16 AM, Nicolas Buduroi <nbudu...@gmail.com>wrote: > >> >> I've just figured out that the macro version in the allocate example >> can't be used with local variables. >> >> (let [foo ByteBuffer] >> (allocate1 foo 1024)) >> >> throws java.lang.UnsupportedOperationException: Can't eval locals >> (NO_SOURCE_FILE:94) >> >> On Jul 6, 6:59 pm, Nicolas Buduroi <nbudu...@gmail.com> wrote: >> > Hi, I needed to call a static method on a class stored in a var >> > yesterday and found that it was a little bit trickier than I initially >> > thought. There's three way of doing it, the two first are quite >> > straightforward and working ;-) e.g.: >> > >> > (import '(java.nio ByteBuffer FloatBuffer)) >> > >> > (def foo ByteBuffer) >> > >> > (. foo (allocate 1024)) ; throw an exception as intended. >> > >> > (defmacro allocate1 [buffer-type size] >> > `(. ~(eval buffer-type) (allocate ~size))) >> > >> > (defn allocate2 [buffer-type size] >> > (eval `(. ~buffer-type (allocate ~size)))) >> > >> > (allocate1 foo 1024) >> > (allocate2 foo 1024) >> > >> > Both works fine, but I'm still not sure which one is the best. The >> > third way is to call a static method from the class object, I've tried >> > something but wasn't able to get it working. It throws some weird >> > exception, here's the code: >> > >> > (defn to-primitive [class] >> > (try >> > (let [type (.getField (identity class) "TYPE")] >> > (.get type Object)) >> > (catch NoSuchFieldException _ class))) >> > >> > (defmacro call-static [class name & args] >> > (let [arg-types (into-array >> > (map (comp to-primitive #(.getClass %)) args)) >> > method (.getMethod (eval class) name arg-types)] >> > `(.invoke ~method ~class ~...@args))) >> > >> > When calling this macro (call-static foo "allocate" 1024) it throws: >> > java.lang.RuntimeException: Can't embed object in code, maybe print- >> > dup not defined: public static java.nio.ByteBuffer >> > java.nio.ByteBuffer.allocate(int) (NO_SOURCE_FILE:0) >> > >> > This error message is quite puzzling isn't it? >> > >> > Is there any other way? >> > >> > Thanks >> > >> > - budu >> >> >> > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. 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. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
