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Diffstat (limited to 'src/clojure/contrib/import_static.clj')
-rw-r--r-- | src/clojure/contrib/import_static.clj | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/clojure/contrib/import_static.clj b/src/clojure/contrib/import_static.clj new file mode 100644 index 00000000..c8015c8a --- /dev/null +++ b/src/clojure/contrib/import_static.clj @@ -0,0 +1,60 @@ +;;; import_static.clj -- import static Java methods/fields into Clojure + +;; by Stuart Sierra, http://stuartsierra.com/ +;; June 1, 2008 + +;; Copyright (c) 2008 Stuart Sierra. All rights reserved. The use and +;; distribution terms for this software are covered by the Common +;; Public License 1.0 (http://www.opensource.org/licenses/cpl1.0.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. + + + +(ns clojure.contrib.import-static + (:use clojure.set)) + +(defmacro import-static + "Imports the named static fields and/or static methods of the class + as (private) symbols in the current namespace. + + Example: + user=> (import-static java.lang.Math PI sqrt) + nil + user=> PI + 3.141592653589793 + user=> (sqrt 16) + 4.0 + + Note: The class name must be fully qualified, even if it has already + been imported. Static methods are defined as MACROS, not + first-class fns." + [class & fields-and-methods] + (let [only (set (map str fields-and-methods)) + the-class (. Class forName (str class)) + static? (fn [x] + (. java.lang.reflect.Modifier + (isStatic (. x (getModifiers))))) + statics (fn [array] + (set (map (memfn getName) + (filter static? array)))) + all-fields (statics (. the-class (getFields))) + all-methods (statics (. the-class (getMethods))) + fields-to-do (intersection all-fields only) + methods-to-do (intersection all-methods only) + make-sym (fn [string] + (with-meta (symbol string) {:private true})) + import-field (fn [name] + (list 'def (make-sym name) + (list '. class (symbol name)))) + import-method (fn [name] + (list 'defmacro (make-sym name) + '[& args] + (list 'list ''. (list 'quote class) + (list 'apply 'list + (list 'quote (symbol name)) + 'args))))] + `(do ~@(map import-field fields-to-do) + ~@(map import-method methods-to-do)))) |