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/* Implementation of Objective-C "collection of delegates" object
Copyright (C) 1993,1994, 1995, 1996 Free Software Foundation, Inc.
Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
Date: May 1993
This file is part of the GNU Objective-C Collection 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.
*/
#include <gnustep/base/DelegatePool.h>
#include <gnustep/base/NSString.h>
@implementation DelegatePool
+ (void) initialize
{
return;
}
+ alloc
{
return (id)class_create_instance(self);
}
+ new
{
return [[self alloc] init];
}
/* This is the designated initializer for this class. */
- init
{
_list = [[Array alloc] init];
_send_behavior = SEND_TO_ALL;
_last_message_had_receivers = NO;
return self;
}
/* Archiving must mimic the above designated initializer */
- (void) encodeWithCoder: anEncoder
{
[anEncoder encodeValueOfCType:@encode(unsigned char)
at:&_send_behavior
withName:@"DelegatePool Send Behavior"];
[anEncoder encodeObject:_list
withName:@"DelegatePool Collection of Delegates"];
}
+ newWithCoder: aDecoder
{
/* xxx Should be:
DelegatePool *n = NSAllocateObject(self, 0, [aDecoder objectZone]); */
DelegatePool *n = (id) NSAllocateObject(self, 0, NS_NOZONE);
[aDecoder decodeValueOfCType:@encode(unsigned char)
at:&(n->_send_behavior)
withName:NULL];
[aDecoder decodeObjectAt:&(n->_list)
withName:NULL];
return n;
}
- write: (TypedStream*)aStream
{
objc_write_type(aStream, @encode(unsigned char), &_send_behavior);
objc_write_object(aStream, _list);
return self;
}
- read: (TypedStream*)aStream
{
objc_write_type(aStream, @encode(unsigned char), &_send_behavior);
objc_read_object(aStream, &_list);
return self;
}
- (void) dealloc
{
[_list release];
#if NeXT_runtime
object_dispose((Object*)self);
#else
NSDeallocateObject((NSObject*)self);
#endif
}
// MANIPULATING COLLECTION OF DELEGATES;
- (void) delegatePoolAddObject: anObject
{
[_list addObject: anObject];
}
- (void) delegatePoolAddObjectIfAbsent: anObject
{
[_list addObjectIfAbsent: anObject];
}
- (void) delegatePoolRemoveObject: anObject
{
[_list removeObject:anObject];
}
- (BOOL) delegatePoolIncludesObject: anObject
{
return [_list containsObject:anObject];
}
- delegatePoolCollection
{
return _list;
}
- (unsigned char) delegatePoolSendBehavior
{
return _send_behavior;
}
- (void) delegatePoolSetSendBehavior: (unsigned char)b
{
_send_behavior = b;
}
- (BOOL) delegatePoolLastMessageHadReceivers
{
return _last_message_had_receivers;
}
// FOR PASSING ALL OTHER MESSAGES TO DELEGATES;
- forward: (SEL)aSel :(arglist_t)argFrame
{
void *ret = 0;
id delegate;
_last_message_had_receivers = NO;
switch (_send_behavior)
{
case SEND_TO_ALL:
FOR_ARRAY(_list, delegate)
{
if ([delegate respondsTo:aSel])
{
ret = [delegate performv:aSel :argFrame];
_last_message_had_receivers = YES;
}
}
END_FOR_ARRAY (_list);
break;
case SEND_TO_FIRST_RESPONDER:
FOR_ARRAY(_list, delegate)
{
if ([delegate respondsTo:aSel])
{
_last_message_had_receivers = YES;
return [delegate performv:aSel :argFrame];
}
}
END_FOR_ARRAY (_list);
break;
case SEND_UNTIL_YES:
FOR_ARRAY(_list, delegate)
{
if ([delegate respondsTo:aSel])
{
_last_message_had_receivers = YES;
if ((ret = [delegate performv:aSel :argFrame]))
return ret;
}
}
END_FOR_ARRAY (_list);
break;
case SEND_UNTIL_NO:
FOR_ARRAY(_list, delegate)
{
if ([delegate respondsTo:aSel])
{
_last_message_had_receivers = YES;
if (!(ret = [delegate performv:aSel :argFrame]))
return ret;
}
}
END_FOR_ARRAY (_list);
break;
}
return ret;
}
@end
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