--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/anagram/support/agnotify.cpp	Sat Dec 22 17:52:45 2007 -0500
@@ -0,0 +1,89 @@
+/*
+ * AnaGram, A System for Syntax Directed Programming
+ * Copyright 1997-2002 Parsifal Software. All Rights Reserved.
+ * See the file COPYING for license and usage terms.
+ *
+ * agnotify.cpp
+ */
+
+#include "agnotify.h"
+#include "myalloc.h"
+
+//#define INCLUDE_LOGGING
+#include "log.h"
+
+
+AgNotificationActionBase::~AgNotificationActionBase() {
+  LOGSECTION("AgNotificationActionBase::~AgNotificationActionBase");
+  LOGV(notifierStack.size());
+  int n = notifierStack.size();
+  while (n--) {
+    LOGV(n);
+    notifierStack[n]->remove(this);
+  }
+}
+
+AgNotificationActionBase &
+AgNotificationActionBase::attach(AgNotifierBase *notifier) {
+  LOGSECTION("AgNotificationActionBase::attach");
+  notifierStack.push(notifier);
+  notifier->attach(this);
+  return *this;
+}
+
+void AgNotificationActionBase::remove(AgNotifierBase *notifier) {
+  LOGSECTION("AgNotificationActionBase::remove");
+  int i, n = notifierStack.size();
+  ok_ptr(this);
+  ok_ptr(notifier);
+  for (i = 0; i < n; i++) {
+    if (notifierStack[i] == notifier) {
+      n--;
+      if (i < n) {
+	notifierStack[i] = notifierStack.pop();
+      }
+      else {
+	notifierStack.pop();
+      }
+      return;
+    }
+  }
+}
+
+AgNotifierBase::~AgNotifierBase() {
+  LOGSECTION("AgNotifierBase::~AgNotifierBase");
+  int n = notifyStack.size();
+  while (n--) {
+    notifyStack[n]->remove(this);
+  }
+}
+
+void AgNotifierBase::notify() {
+  LOGSECTION("AgNotifierBase::notify");
+  int n = notifyStack.size();
+  int i;
+  for (i = 0; i < n; i++) {
+    notifyStack[i]->perform();
+  }
+}
+
+void AgNotifierBase::remove(AgNotificationActionBase *action) {
+  LOGSECTION("AgNotifierBase::remove");
+  int i, n = notifyStack.size();
+  for (i = 0; i < n; i++) {
+    if (notifyStack[i] == action) {
+      n--;
+      LOGV(i);
+      LOGV(n);
+      LOGV(notifyStack.size());
+      if (i < n) {
+	notifyStack[i] = notifyStack.pop();
+      }
+      else {
+	notifyStack.pop();
+      }
+      return;
+    }
+  }
+}
+