When extending a Java class in Clojure, what is a clean way to support
multiple constructors in the base class? Below is a sample of how I
accomplished this. The key point is that the base class has two
constructors and to expose both of these in Clojure I needed to create
two proxies. I used a macro to avoid duplicating the proxy definition.
My question is: is there a better way to accomplish this, perhaps
using a mechanism other than proxy?
Thank you.
-David McNeil
====
Person.java
=====
package demo;
public class Person {
private int id = 0;
private String name;
public Person( int id ) {
this.id = id;
}
public Person( int id, String name ) {
this.id = id;
this.name = name;
}
public String toString() {
return "Person id=" + id + " name=" + name;
}
}
====
demo.clj
====
(ns clojure-proxy.demo
(:import (demo Person)))
(defmacro sub-person [& args]
`(proxy [Person] [...@args]
(toString [] (str "overridden toString"))))
(defn to-person
([id]
(sub-person id))
([id name]
(sub-person id name)))
(.toString (to-person 15 "joe"))
(.toString (to-person 20))
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