r3625: *** empty log message ***

[hyperobject.git] / mop.lisp

diff --git a/mop.lisp b/mop.lisp
index d1567ab5ac4254c6c9df828328f106355c348a48..84962823c874719170d5b8ba5ece212d0753c3f4 100644 (file)
--- a/mop.lisp
+++ b/mop.lisp
@@ -11,7 +11,7 @@
 ;;;; in Text, HTML, and XML formats. This includes hyperlinking
 ;;;; capability and sub-objects.
 ;;;;
-;;;; $Id: mop.lisp,v 1.11 2002/12/13 08:25:45 kevin Exp $
+;;;; $Id: mop.lisp,v 1.13 2002/12/13 22:26:41 kevin Exp $
 ;;;;
 ;;;; This file is Copyright (c) 2000-2002 by Kevin M. Rosenberg
 ;;;;
@@ -48,9 +48,13 @@
               "List of fields that contain a list of subobjects objects.")
    (hyperlinks :type list :initform nil :accessor hyperlinks
               :documentation "List of fields that have hyperlinks")
+   (direct-rules :type list :initform nil :accessor direct-rules
+                :documentation "List of rules to fire on slot changes.")
    (class-id :type integer :initform nil
             :accessor class-id
             :documentation "Unique ID for the class")
+   (default-view :initform nil :initarg :default-view :accessor default-view
+                :documentation "The default view for a class")
 
    ;; SQL commands
    (create-table-cmd :initform nil :reader create-table-cmd)
@@ -59,8 +63,8 @@
 
    (views :type list :initform nil :initarg :views :accessor views
          :documentation "List of views")
-   (default-view :initform nil :initarg :default-view :accessor default-view
-                :documentation "The default view for a class")
+   (rules :type list :initform nil :initarg :rules :accessor rules
+         :documentation "List of rules")
    )
   (:documentation "Metaclass for Markup Language classes."))
 
@@ -203,6 +207,8 @@
        :description (slot-value dsd 'description)
        :user-name (slot-value dsd 'user-name)
        :index (slot-value dsd 'index)
+       :value-constraint (slot-value dsd 'value-constraint)
+       :null-allowed (slot-value dsd 'null-allowed)
        ia))))
 
 (defun ho-type-to-lisp-type (ho-type)
@@ -337,6 +343,7 @@
   (finalize-views cl)
   (finalize-hyperlinks cl)
   (finalize-sql cl)
+  (finalize-rules cl)
   (finalize-documentation cl))
 
 
@@ -362,3 +369,55 @@
 (defun hyperobject-class-fields (obj)
   (class-slots (class-of obj)))
 
+;;; Slot accessor and class rules
+
+(defclass rule ()
+  ((dependants :initarg dependants :initform nil :accessor dependants)
+   (volatile :initarg modifieds :initform nil :accessor modifieds)
+   (source-code :initarg source-code :initform nil :accessor source-code)
+   (function :initform nil :accessor function)))
+
+(defun compile-rule (source-code cl)
+  )
+  
+(defun finalize-rules (cl)
+  (let* ((direct-rules (direct-rules cl))
+        (rule-vector (make-vector (length direct-rules) :fill-pointer nil
+                                  :adjustable nil)))
+    (dotimes (i (length direct-rules))
+      (destructuring-bind (name (&key dependants volatile) &rest source-code)
+         (nth i direct-rules)
+       (setf (aref rule-vector i) (make-instance 'rule
+                                                 :name name
+                                                 :dependants depedenants
+                                                 :volatile volatile
+                                                 :source-code source-code
+                                                 :function (compile-rule source-code cl)))))
+    (setf (rules cl) rule-vector)))
+
+(defun fire-class-rules (cl obj)
+  "Fire all class rules. Called after a slot is modified."
+  (dolist (rule (direct-rules cl))
+    (cmsg "firing rule: ~a" rule)))
+
+
+(defmethod (setf slot-value-using-class) 
+    :around (new-value (cl hyperobject-class) obj
+            (slot standard-effective-slot-definition))
+  (cmsg-c :verbose "Setf slot value: class: ~s, obj: ~s, slot: ~s, value: ~s" cl (class-of obj) slot new-value)
+  (let ((func (esd-value-constraint slot)))
+    (cond
+     ((and func (not (funcall func new-value obj)))
+      (warn "Rejected change to value of slot ~a of object ~a"
+           (slot-definition-name slot) obj)
+      (slot-value obj (slot-definition-name slot)))
+     (t
+      (call-next-method)
+      (fire-class-rules cl obj)
+      new-value))))
+  
+(defmethod slot-value-using-class :around ((cl hyperobject-class) obj
+                                          (slot standard-effective-slot-definition))
+  (let ((value (call-next-method)))
+    (cmsg-c :verbose "slot value: class: ~s, obj: ~s, slot: ~s" cl (class-of obj) slot)
+    value))