On Sun, Jan 30, 2011 at 8:39 PM, Ken Wesson <[email protected]> wrote:
> On Sun, Jan 30, 2011 at 1:35 PM, Jonas Enlund <[email protected]> wrote:
>> On Sun, Jan 30, 2011 at 7:01 PM, Ken Wesson <[email protected]> wrote:
>>> On Sun, Jan 30, 2011 at 9:26 AM, Jonas Enlund <[email protected]>
>>> wrote:
>>>> Hi.
>>>> I'm trying to create a java.io.Writer proxy (which writes to a
>>>> JTextArea) but I can't get it to work.
>>>> Here is my clojure code so far:
>>>>
>>>> (def text-area (javax.swing.JTextArea.))
>>>>
>>>> (def frame
>>>> (let [f (javax.swing.JFrame.)]
>>>> (.. f getContentPane (add text-area))
>>>> (.setMinimumSize f (java.awt.Dimension. 200 200))
>>>> (.setVisible f true)
>>>> f))
>>>>
>>>> (def text-area-writer
>>>> (proxy [java.io.Writer] []
>>>> (close [])
>>>> (flush [])
>>>> (write [^chars chrs ^int offs ^int len]
>>>> (.append text-area (String. chrs offs len)))))
>>>>
>>>> When I load the code above I get an "IllegalArgumentException: Unable
>>>> to resolve classname: int" so I think I'm not type hinting correctly.
>>>
>>> Indeed. You can't (in 1.2 at least) type hint "int" though you can
>>> "ints" (array of int). Note that int is a primitive type while array
>>> of int is a reference type.
>>>
>>> Type hinting as Integer shouldn't throw exceptions, but you can
>>> probably omit all but the chars hint and have the correct String
>>> constructor overload selected.
>>
>> I tried with 1.3.0-alpha5. With type hints I get "CompilerException
>> java.lang.IllegalArgumentException: Only long and double primitives
>> are supported". If I only keep the ^chars hint I get an ArityException
>> when I do (.write text-area-writer "hello").
>
> Does it work with 1.2? Where exactly is the ArityException being
> thrown -- for what function or method?
It didn't work in 1.2 either. Here is some more info on the exception
thrown (this is with 1.3.0-alpha5)
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=>
Thanks for helping out with this Ken!
>
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