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 -~----------~----~----~----~------~----~------~--~---
