3 ;;;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
5 ;;;; This program is free software; you can redistribute it and/or modify
6 ;;;; it under the terms of the GNU General Public License as published by
7 ;;;; the Free Software Foundation; either version 2, or (at your option)
8 ;;;; any later version.
10 ;;;; This program is distributed in the hope that it will be useful,
11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ;;;; GNU General Public License for more details.
15 ;;;; You should have received a copy of the GNU General Public License
16 ;;;; along with this software; see the file COPYING. If not, write to
17 ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
18 ;;;; Boston, MA 02111-1307 USA
20 ;;;; As a special exception, the Free Software Foundation gives permission
21 ;;;; for additional uses of the text contained in its release of GUILE.
23 ;;;; The exception is that, if you link the GUILE library with other files
24 ;;;; to produce an executable, this does not by itself cause the
25 ;;;; resulting executable to be covered by the GNU General Public License.
26 ;;;; Your use of that executable is in no way restricted on account of
27 ;;;; linking the GUILE library code into it.
29 ;;;; This exception does not however invalidate any other reasons why
30 ;;;; the executable file might be covered by the GNU General Public License.
32 ;;;; This exception applies only to the code released by the
33 ;;;; Free Software Foundation under the name GUILE. If you copy
34 ;;;; code from other Free Software Foundation releases into a copy of
35 ;;;; GUILE, as the General Public License permits, the exception does
36 ;;;; not apply to the code that you add in this way. To avoid misleading
37 ;;;; anyone as to the status of such modified files, you must delete
38 ;;;; this exception notice from them.
40 ;;;; If you write modifications of your own for GUILE, it is your choice
41 ;;;; whether to permit this exception to apply to your modifications.
42 ;;;; If you do not wish that, delete this exception notice.
46 ;;;; This software is a derivative work of other copyrighted softwares; the
47 ;;;; copyright notices of these softwares are placed in the file COPYRIGHTS
49 ;;;; This file is based upon composite-slot.stklos from the STk
50 ;;;; distribution by Erick Gallesio <eg@unice.fr>.
53 (define-module (oop goops composite-slot)
54 :use-module (oop goops)
55 :export (<composite-class>))
58 ;;; (define-class CLASS SUPERS
62 ;;; (SLOT #:allocation #:propagated
63 ;;; #:propagate-to '(PROPAGATION ...))
65 ;;; #:metaclass <composite-class>)
67 ;;; PROPAGATION ::= OBJECT | (OBJECT TARGETSLOT)
69 ;;; The slot SLOT will be propagated to the slot TARGETSLOT in the object
70 ;;; stored in slot OBJECT. If TARGETSLOT is omitted, assume that the target
71 ;;; slot is named SLOT.
74 (define-class <composite-class> (<class>))
76 (define-method (compute-get-n-set (class <composite-class>) slot)
77 (if (eq? (slot-definition-allocation slot) #:propagated)
78 (compute-propagated-get-n-set slot)
81 (define (compute-propagated-get-n-set s)
82 (let ((prop (get-keyword #:propagate-to (cdr s) #f))
83 (s-name (slot-definition-name s)))
86 (goops-error "Propagation not specified for slot ~S" s-name))
87 (if (not (pair? prop))
88 (goops-error "Bad propagation list for slot ~S" s-name))
90 (let ((objects (map (lambda (p) (if (pair? p) (car p) p)) prop))
91 (slots (map (lambda (p) (if (pair? p) (cadr p) s-name)) prop)))
92 (let ((first-object (car objects))
93 (first-slot (car slots)))
97 (slot-ref (slot-ref o first-object) first-slot))
100 (if (null? (cdr objects))
102 (slot-set! (slot-ref o first-object) first-slot v))
104 (for-each (lambda (object slot)
105 (slot-set! (slot-ref o object) slot v))