On Sun, Jan 30, 2011 at 1:47 PM, Jonas Enlund <jonas.enl...@gmail.com> wrote:
> user=> (.write text-area-writer "Hello, World!")
> ArityException Wrong number of args (2) passed to: user$fn--38$fn
> clojure.lang.AFn.throwArity (AFn.java\
> :439)
> user=> (pst)
> ArityException Wrong number of args (2) passed to: user$fn--38$fn
> user.proxy$java.io.Writer$0.write (:-1)
> sun.reflect.NativeMethodAccessorImpl.invoke0
> (NativeMethodAccessorImpl.java:-2)
> sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:57)
> sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:43)
> java.lang.reflect.Method.invoke (Method.java:616)
> clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:90)
> clojure.lang.Reflector.invokeInstanceMethod (Reflector.java:28)
> user/eval47 (NO_SOURCE_FILE:4)
> clojure.lang.Compiler.eval (Compiler.java:6223)
> clojure.lang.Compiler.eval (Compiler.java:6190)
> clojure.core/eval (core.clj:2680)
> clojure.main/repl/read-eval-print--5617 (main.clj:180)
> nil
> user=>
The proxy documentation says
If a method fn is not provided for a class method, the superclass
methd will be called.
This doesn't seem to work if you override one of several overloads of
a method. The documentation should probably be clarified to reflect
that this isn't the case for overloads of a method you have
overridden; it seems you have to supply one function (overloaded for
arity) that implements all of the overloads, as that one function will
be called for all of the overloads.
This proxy works:
(proxy [java.io.Writer] []
(close [])
(flush [])
(write
([chrs offs len]
(if (string? chrs)
(.append text-area (subs chrs offs (+ offs len)))
(.append text-area (String. ^chars chrs offs len))))
([thing]
(.append text-area (str thing))))))
The second arity handles all the overloaded .write methods with only
one parameter, and the first handles the String offset length and
Char-Array offset length overloads.
> Thanks for helping out with this Ken!
You're welcome.
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