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;; Copyright (c) Stephen C. Gilardi. All rights reserved. The use and
;; distribution terms for this software are covered by the Common Public
;; License 1.0 (http://opensource.org/licenses/cpl.php) which can be found
;; in the file CPL.TXT 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.
;;
;; except.clj
;;
;; scgilardi (gmail)
;; Created 07 July 2008
(ns clojure.contrib.except)
(defn throw-if
"Throws an exception with a message if pred is true. Arguments are:
pred class? format format-args*
class is optional and defaults to Exception. If present, it must be a
Class in the tree under Throwable with a constructor that takes a single
String.
format is a string as documented for java.util.Formatter.
format-args are zero or more objects that correspond to the format
specifiers in format."
[pred & args]
(when pred
(let [class-present (instance? Class (first args))
args (if class-present args (cons Exception args))
[class fmt & fmt-args] args
ctor (.getConstructor (identity class) (into-array [String]))
message (apply format fmt fmt-args)
exception (.newInstance ctor (into-array [message]))
raw-trace (.getStackTrace exception)
boring? #(not= (.getMethodName %) "doInvoke")
trace (into-array (drop 2 (drop-while boring? raw-trace)))]
(.setStackTrace exception trace)
(throw exception))))
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