source: trunk/abcl/examples/java-interface/interface_implementation.lisp @ 15577

Last change on this file since 15577 was 11384, checked in by vvoutilainen, 14 years ago

Add Id tags and thus keyword properties.

  • Property svn:keywords set to Id
File size: 2.7 KB
Line 
1;;; interface_implementation.lisp
2;;;
3;;; Copyright (C) 2008 Ville Voutilainen
4;;; $Id: interface_implementation.lisp 11384 2008-11-08 09:27:29Z vvoutilainen $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19
20; first we define a class hierarchy. No slots defined,
21; we don't need them in the example.
22(defclass base ())
23
24(defclass derived1 (base))
25
26(defclass derived2 (base))
27
28; then a couple of generic methods
29(defgeneric invoke (param) (:documentation "Sample generic function"))
30
31(defgeneric invoke2 (param) (:documentation "Sample generic function"))
32
33; and their methods, for different classes
34(defmethod invoke ((param derived1))
35  (format t "in derived1 invoke~%"))
36
37(defmethod invoke ((param derived2))
38  (format t "in derived2 invoke~%"))
39
40(defmethod invoke2 ((param derived1))
41  (format t "in derived1 invoke2~%"))
42
43(defmethod invoke2 ((param derived2))
44  (format t "in derived2 invoke2~%"))
45
46; closure for interface implementation, closes
47; over a provided object and calls the invoke
48; method with the object. Thus the firstFunction()
49; in MyInterface will call the invoke method.
50(defun make-first-function (object)
51  (lambda () (invoke object)))
52
53; closure for interface implementation, closes
54; over a provided object and invokes the invoke2
55; method with the object. Thus the secondFunction()
56; in MyInterface will call the invoke2 method.
57(defun make-second-function (object)
58  (lambda () (invoke2 object)))
59
60; gets an interface implementation, uses an instance of
61; class derived1
62(defun get-interface ()
63  (let ((firstobject (make-instance 'derived1)))
64    (jinterface-implementation "MyInterface"
65             "firstFunction" 
66             (make-first-function firstobject)
67             "secondFunction"
68             (make-second-function firstobject))))
69
70; gets an interface implementation, uses an instance of
71; class derived2
72(defun get-another-interface ()
73  (let ((secondobject (make-instance 'derived2)))
74    (jinterface-implementation "MyInterface"
75             "firstFunction" 
76             (make-first-function secondobject)
77             "secondFunction"
78             (make-second-function secondobject))))
79           
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