Good to know thee, thank you T & T!
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On Mon, Mar 9, 2015 at 11:21 PM, Tassilo Horn <t...@gnu.org> wrote:
> "Juvenn Woo" <mach...@gmail.com> writes:
>> I am writing a function that'll take a java class name as an arg,
>> wherein I'll make instance of the class. Several approaches did I try:
>>
>> (let [klass Integer] (new klass 42)) ; this raises exception "unable to
>> resolve
>> symbol: klass"
>>
>> (let [klass Integer] (.new klass 42)) ; raises "no matching method found: new
>> for class java.lang. Class"
>>
>> I'm running out of ideas currently. How do you deal the use case like
>> this? And what's the idiomatic way to do this?
> I think there's no generic predefined way to do this and you have to do
> the same as what you would need to do in Java, too. I.e., use
> reflection to enumerate the given class' constructors in order to find
> the one you want to call (correct number and types of its arguments).
> But maybe you can use something less generic in your scenario, e.g.:
> --8<---------------cut here---------------start------------->8---
> (let [constructors {Integer #(Integer. %)
> Long #(Long. %)
> java.awt.Dimension #(java.awt.Dimension. % %)}
> make (fn [type & args]
> (apply (constructors type) args))]
> (for [cls [Integer Long java.awt.Dimension]]
> (make cls 1)))
> ;;=> (1 1 #<Dimension java.awt.Dimension[width=1,height=1]>)
> --8<---------------cut here---------------end--------------->8---
> Bye,
> Tassilo
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