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;;; interface_implementation.lisp
;;;
;;; Copyright (C) 2008 Ville Voutilainen
;;; $Id$
;;;
;;; 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
; first we define a class hierarchy. No slots defined,
; we don't need them in the example.
(defclass base ())
(defclass derived1 (base))
(defclass derived2 (base))
; then a couple of generic methods
(defgeneric invoke (param) (:documentation "Sample generic function"))
(defgeneric invoke2 (param) (:documentation "Sample generic function"))
; and their methods, for different classes
(defmethod invoke ((param derived1))
(format t "in derived1 invoke~%"))
(defmethod invoke ((param derived2))
(format t "in derived2 invoke~%"))
(defmethod invoke2 ((param derived1))
(format t "in derived1 invoke2~%"))
(defmethod invoke2 ((param derived2))
(format t "in derived2 invoke2~%"))
; closure for interface implementation, closes
; over a provided object and calls the invoke
; method with the object. Thus the firstFunction()
; in MyInterface will call the invoke method.
(defun make-first-function (object)
(lambda () (invoke object)))
; closure for interface implementation, closes
; over a provided object and invokes the invoke2
; method with the object. Thus the secondFunction()
; in MyInterface will call the invoke2 method.
(defun make-second-function (object)
(lambda () (invoke2 object)))
; gets an interface implementation, uses an instance of
; class derived1
(defun get-interface ()
(let ((firstobject (make-instance 'derived1)))
(jinterface-implementation "MyInterface"
"firstFunction"
(make-first-function firstobject)
"secondFunction"
(make-second-function firstobject))))
; gets an interface implementation, uses an instance of
; class derived2
(defun get-another-interface ()
(let ((secondobject (make-instance 'derived2)))
(jinterface-implementation "MyInterface"
"firstFunction"
(make-first-function secondobject)
"secondFunction"
(make-second-function secondobject))))
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