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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@1217 72102866-910b-0410-8b05-ffd578937521

Source/NotificationQueue.m

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+/* Implementation of object for queuing Notification objects
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Written by:  R. Andrew McCallum <mccallum@gnu.ai.mit.edu>
+   Created: March 1996
+
+   This file is part of the GNU Objective C Class Library.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* The implementation for NotificationDispatcher. */
+
+#include <objects/stdobjects.h>
+#include <objects/NotificationQueue.h>
+#include <objects/Notification.h>
+#include <objects/LinkedListNode.h>
+#include <objects/Array.h>
+#include <objects/Invocation.h>
+#include <Foundation/NSException.h>
+
+@implementation NotificationQueue
+
+/* This is the default initialzer. */
+- initWithNotificationDistributor: nd
+{
+  [super init];
+  _notification_distributor = nd;
+  _asap_queue = [Queue new];
+  _idle_queue = [Queue new];
+  return self;
+}
+
+- init
+{
+  return [self initWithNotificationDistributor:
+		 [NotificationDistributor defaultInstance]];
+}
+
+- (void) dequeueNotificationsMatching: notification
+			 coalesceMask: (unsigned)mask
+{
+  /* Remove from the queues notifications that match NOTIFICATION, according
+     the the MASK. */
+  void remove_matching_from_queue (id q)
+    {
+      int i;
+      for (i = [q count] - 1; i >= 0; i--)
+	{
+	  id n = [q objectAtIndex: i];
+	  /* If the aspects that need to match do match... */
+	  if (( !(mask & NSNotificationCoalescingOnName)
+		|| [[notification name] isEqual: [n name]])
+	      &&
+	      ( !(mask & NSNotificationCoalescingOnSender)
+		|| [[notification object] isEqual: [n object]]))
+	    /* ...then remove it. */
+	    [q removeObjectAtIndex: i];
+	}
+    }
+  remove_matching_from_queue (_asap_queue);
+  remove_matching_from_queue (_idle_queue);
+}
+
+- (void) enqueueNotification: notification
+		postingStyle: (NSPostingStyle)style
+                coalesceMask: (unsigned)mask
+		    forModes: (id <ConstantCollecting>)modes
+{
+  [self dequeueNotificationsMatching: notification
+	coalesceMask: mask];
+  
+  switch (style) 
+    {
+    case NSPostIdle:
+      [_idle_queue enqueueObject: notification];
+      break;
+    case NSPostASAP:
+      [_asap_queue enqueueObject: notification];
+      break;
+    case NSPostNow:
+      if ([modes containsObject: [RunLoop mode]])
+	[_notification_distributor postNotification: notification];
+      else
+	/* xxx This is the correct behavior? */
+	[_asap_queue enqueueObject: notification];
+      break;
+    default:
+      [self error: "Bad posting style."];
+    }
+}
+
+- (void) enqueueNotification: notification
+		postingStyle: (NSPostingStyle)style
+{
+  [self enqueueNotification: notification
+	postingStyle: style
+	coalesceMask: (NSNotificationCoalescingOnName
+		       | NSNotificationCoalescingOnSender)
+	modes: nil];
+}
+
+
+- (void) postNotificationsWithASAPStyle
+{
+  id n;
+  int i, c = [_asap_queue count];
+
+  for (i = 0; i < c; i++)
+    [_notification_dispatcher postNotification: 
+				[_idle_queue objectAtIndex: i]];
+  [_asap_queue empty];
+}
+
+- (void) postNotificationWithIdleStyle
+{
+  id n = [_idle_queue dequeueObject];
+  [_notification_dispatcher postNotification: n];
+}
+
+@end