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;; Copyright (c) Stephen C. Gilardi. All rights reserved. The use and
;; distribution terms for this software are covered by the Eclipse Public
;; License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) which can
;; be found in the file epl-v10.html at the root of this distribution. By
;; using this software in any fashion, you are agreeing to be bound by the
;; terms of this license. You must not remove this notice, or any other,
;; from this software.
;;
;; clojure.contrib.condition.example.clj
;;
;; scgilardi (gmail)
;; Created 09 June 2009
(ns example.condition
(:use (clojure.contrib
[condition
:only (handler-case print-stack-trace raise *condition*)])))
(defn func [x y]
"Raises an exception if x is negative"
(when (neg? x)
(raise :type :illegal-argument :arg 'x :value x))
(+ x y))
(defn main
[]
;; simple handler
(handler-case :type
(println (func 3 4))
(println (func -5 10))
(handle :illegal-argument
(print-stack-trace *condition*))
(println 3))
;; multiple handlers
(handler-case :type
(println (func 4 1))
(println (func -3 22))
(handle :overflow
(print-stack-trace *condition*))
(handle :illegal-argument
(print-stack-trace *condition*)))
;; nested handlers
(handler-case :type
(handler-case :type
nil
nil
(println 1)
(println 2)
(println 3)
(println (func 8 2))
(println (func -6 17))
;; no handler for :illegal-argument
(handle :overflow
(println "nested")
(print-stack-trace *condition*)))
(println (func 3 4))
(println (func -5 10))
(handle :illegal-argument
(println "outer")
(print-stack-trace *condition*))))