;;; Lisplab, level1-constructors.lisp
;;; A symbolic naming scheme for matrix construction.

;;; Copyright (C) 2009 Joern Inge Vestgaarden
;;;
;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License along
;;; with this program; if not, write to the Free Software Foundation, Inc.,
;;; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

;;; TODO: maybe I should store constructors rather than symbols. 
;;;;      Then it would be possible to use this also for arrays. 

(in-package :lisplab)

(defgeneric make-matrix-class (element-type structure implementation)
  (:documentation "Create a matrix class from the three description elements. 
Overload with eql specializers if you want to speed up for some particular 
classes." ))

;;;; Matrix constructors

(defmethod make-matrix-class (element-type structure implementation)
  (let* ((args (list element-type structure implementation)))
    (make-instance 'standard-class 
		   :direct-superclasses args)))

(defmethod make-matrix-instance ((type standard-class) dim value)
  (make-instance type :dim dim :value value))

(defmethod make-matrix-instance ((type symbol) dim value)
  (make-matrix-instance (find-class type) dim value))

(defmethod make-matrix-instance ((description list) dim value)
  (assert (= 3 (length description)))
  (make-matrix-instance (apply #'make-matrix-class description)
			dim value))