Re: proxy doesn't care about type hints?
2013/4/15 Jim - FooBar(); jimpil1...@gmail.com I was very surprised to find out that it is practically impossible to subclass some Class Foo and override only 1 overload of some method bar() via proxy...especially, if there are more than 1 methods 'bar' taking args like below, where InterfaceY extends InterfaceX. Providing the types does nothing - it seems proxy only cares about arity I don't think proxy can do that, save for dispatching to proxy-super yourself. gen-class seems to support for overriding based on type signature, demonstrated here http://dishevelled.net/Tricky-uses-of-Clojure-gen-class-and-AOT-compilation.html Since this is not documented, I wonder if it's officially supported, though. -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: proxy doesn't care about type hints?
Hi, Am Montag, 15. April 2013 20:57:30 UTC+2 schrieb Jim foo.bar: Hi everyone, I was very surprised to find out that it is practically impossible to subclass some Class Foo and override only 1 overload of some method bar() via proxy...especially, if there are more than 1 methods 'bar' taking args like below, where InterfaceY extends InterfaceX. Providing the types does nothing - it seems proxy only cares about arity void bar(InterfaceX ix); //*not *supposed to be overriden abstract void bar(InterfaceY iy); //but this is indeed supposed to be overriden Does this work? (proxy [YourClass BarInterface] [] (bar [x-or-y] (if (instance? InterfaceY x-or-y) (override x-or-y) (proxy-super x-or-y Their might be cases where this works. And where it doesn't. Eg. when the X-bar calls the Y-bar. Meikel -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: proxy doesn't care about type hints?
On 15/04/13 21:37, Meikel Brandmeyer (kotarak) wrote: Their might be cases where this works. And where it doesn't. Eg. when the X-bar calls the Y-bar. Unfortunately that is exactly what is happening... :( http://grepcode.com/file/repo1.maven.org/maven2/org.apache.uima/uimaj-core/2.4.0/org/apache/uima/analysis_component/JCasAnnotator_ImplBase.java/ line 46 and 67 to save you potential time... the non-abstract method which accepts the more general Interface, casts its argument and delegates to the more specific signature (which is supposed to be overriden) with that cast... The problem is that this is not an uncommon pattern in Java...It may be the first time I'm working with it but I've seen it elsewhere...that is whay it sort of surprises we don't have a good story for that...even gen-class is getting slightly ugly and complicated...but nothing beats 'proxy' (If i could use it!)... Jim -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: proxy doesn't care about type hints?
On 15/04/13 21:37, Meikel Brandmeyer (kotarak) wrote: (proxy [YourClass BarInterface] [] (bar [x-or-y] (if (instance? InterfaceY x-or-y) (override x-or-y) (proxy-super x-or-y I'm sorry I forgot...what is 'override' above? what fn is this? I cannot find docs... Jim -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: proxy doesn't care about type hints?
Am Montag, 15. April 2013 23:03:56 UTC+2 schrieb Jim foo.bar: On 15/04/13 21:37, Meikel Brandmeyer (kotarak) wrote: (proxy [YourClass BarInterface] [] (bar [x-or-y] (if (instance? InterfaceY x-or-y) (override x-or-y) (proxy-super x-or-y I'm sorry I forgot...what is 'override' above? what fn is this? I cannot find docs... It is just a placeholder for the override logic since you wrote that in case of an InterfaceY you want to override the method. You would provide override. Meikel -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: proxy doesn't care about type hints?
aaa ok sorry... proxy-super is a no-no in this case...I think at this point my best bet is to write a macro that will expand into a gen-class skeleton form...there is no other way I'm afraid...the proxy approach would be so elegant if it worked! Jim On 15/04/13 22:17, Meikel Brandmeyer (kotarak) wrote: Am Montag, 15. April 2013 23:03:56 UTC+2 schrieb Jim foo.bar: On 15/04/13 21:37, Meikel Brandmeyer (kotarak) wrote: (proxy [YourClass BarInterface] [] (bar [x-or-y] (if (instance? InterfaceY x-or-y) (override x-or-y) (proxy-super x-or-y I'm sorry I forgot...what is 'override' above? what fn is this? I cannot find docs... It is just a placeholder for the override logic since you wrote that in case of an InterfaceY you want to override the method. You would provide override. Meikel -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- 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 --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
