java reflection during macro
Hi, I'm trying to write some macros for java object instanciation. Here's the code: (defn- gen-object-method [my-class id option value] (let [method (some (java-methods option) (map #(.getName %) (.getMethods my-class)))] (when (not method) (throw (new java.lang.IllegalArgumentException (str "A method for " option " was not found in class " component-class (list (symbol (str "." method)) id value))) (defmacro gen-java-code [my-class &body] (gen-object-method myclass ~id arg val) ) Function gen-object-method is called from a macro (that tries to generate java code). My problem is that my-class is a symbol and not a java class, so that (.getMethod ) fails with No matching field found: getMethods for class clojure.lang.Symbol [Thrown class java.lang.IllegalArgumentException] How can I check in a macro that a particular java method exists for a class or not? Thanks, Razvan -- 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
Re: java reflection during macro
you can use all the things can use outside of macros: resolve Class/forName etc On Thu, Dec 8, 2011 at 1:06 PM, Razvan Rotaru wrote: > Hi, > > I'm trying to write some macros for java object instanciation. Here's > the code: > > > (defn- gen-object-method [my-class id option value] > (let [method (some (java-methods option) (map #(.getName %) > (.getMethods my-class)))] > (when (not method) > (throw (new java.lang.IllegalArgumentException (str "A > method for " option " was not found in class " component-class > (list (symbol (str "." method)) id value))) > > > (defmacro gen-java-code [my-class &body] > > (gen-object-method myclass ~id arg val) > ) > > Function gen-object-method is called from a macro (that tries to > generate java code). My problem is that my-class is a symbol and not a > java class, so that (.getMethod ) fails with > > No matching field found: getMethods for class clojure.lang.Symbol > [Thrown class java.lang.IllegalArgumentException] > > > How can I check in a macro that a particular java method exists for a > class or not? > > Thanks, > Razvan > > -- > 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 -- And what is good, Phaedrus, And what is not good— Need we ask anyone to tell us these things? -- 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
Re: java reflection during macro
Not sure if it helps, but here's my example of using reflection in a macro: http://stuartsierra.com/2010/12/16/single-abstract-method-macro -S -- 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
Re: java reflection during macro
Thanks. I was missing the call to resolve. (let [klass (resolve c)] ) With it it works. Razvan On Dec 8, 11:39 pm, Stuart Sierra wrote: > Not sure if it helps, but here's my example of using reflection in a macro: > > http://stuartsierra.com/2010/12/16/single-abstract-method-macro > > -S -- 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
