Source

lazymap / src / de / kotka / lazymap / LazyMapSeq.clj

;-
; Copyright 2008,2009 (c) Meikel Brandmeyer.
; All rights reserved.
;
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
; THE SOFTWARE.

(clojure.core/ns de.kotka.lazymap.LazyMapSeq
  (:gen-class
     :init         init
     :state        theSeq
     :extends      clojure.lang.ASeq
     :constructors {[clojure.lang.ISeq] []
                    [clojure.lang.ISeq clojure.lang.IPersistentMap]
                    [clojure.lang.IPersistentMap]}))

(defn- -init
  ([theSeq]         [[] theSeq])
  ([theSeq theMeta] [[theMeta] theSeq]))

(defn- -first
  [#^de.kotka.lazymap.LazyMapSeq this]
  (let [first-val (first (.theSeq this))]
    (de.kotka.lazymap.LazyMapEntry. (key first-val) (val first-val))))

(defn- -next
  [#^de.kotka.lazymap.LazyMapSeq this]
  (when-let [inner-rest (next (.theSeq this))]
    (de.kotka.lazymap.LazyMapSeq. inner-rest)))