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1 ;;; import_static.clj -- import static Java methods/fields into Clojure
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2
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3 ;; by Stuart Sierra, http://stuartsierra.com/
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4 ;; June 1, 2008
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5
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6 ;; Copyright (c) Stuart Sierra, 2008. All rights reserved. The use
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7 ;; and distribution terms for this software are covered by the Eclipse
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8 ;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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9 ;; which can be found in the file epl-v10.html at the root of this
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10 ;; distribution. By using this software in any fashion, you are
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11 ;; agreeing to be bound by the terms of this license. You must not
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12 ;; remove this notice, or any other, from this software.
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13
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14
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15
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16 (ns
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17 ^{:author "Stuart Sierra",
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18 :doc "Import static Java methods/fields into Clojure"}
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19 clojure.contrib.import-static
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20 (:use clojure.set))
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21
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22 (defmacro import-static
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23 "Imports the named static fields and/or static methods of the class
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24 as (private) symbols in the current namespace.
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25
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26 Example:
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27 user=> (import-static java.lang.Math PI sqrt)
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28 nil
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29 user=> PI
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30 3.141592653589793
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31 user=> (sqrt 16)
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32 4.0
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33
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34 Note: The class name must be fully qualified, even if it has already
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35 been imported. Static methods are defined as MACROS, not
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36 first-class fns."
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37 [class & fields-and-methods]
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38 (let [only (set (map str fields-and-methods))
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39 the-class (. Class forName (str class))
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40 static? (fn [x]
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41 (. java.lang.reflect.Modifier
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42 (isStatic (. x (getModifiers)))))
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43 statics (fn [array]
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44 (set (map (memfn getName)
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45 (filter static? array))))
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46 all-fields (statics (. the-class (getFields)))
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47 all-methods (statics (. the-class (getMethods)))
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48 fields-to-do (intersection all-fields only)
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49 methods-to-do (intersection all-methods only)
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50 make-sym (fn [string]
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51 (with-meta (symbol string) {:private true}))
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52 import-field (fn [name]
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53 (list 'def (make-sym name)
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54 (list '. class (symbol name))))
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55 import-method (fn [name]
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56 (list 'defmacro (make-sym name)
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57 '[& args]
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58 (list 'list ''. (list 'quote class)
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59 (list 'apply 'list
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60 (list 'quote (symbol name))
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61 'args))))]
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62 `(do ~@(map import-field fields-to-do)
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63 ~@(map import-method methods-to-do))))
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