1//------------------------------------------------------------------------------
2//	Copyright (c) 2001-2002, Haiku
3//
4//	Permission is hereby granted, free of charge, to any person obtaining a
5//	copy of this software and associated documentation files (the "Software"),
6//	to deal in the Software without restriction, including without limitation
7//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
8//	and/or sell copies of the Software, and to permit persons to whom the
9//	Software is furnished to do so, subject to the following conditions:
10//
11//	The above copyright notice and this permission notice shall be included in
12//	all copies or substantial portions of the Software.
13//
14//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20//	DEALINGS IN THE SOFTWARE.
21//
22//	File Name:		Watcher.h
23//	Author:			Ingo Weinhold (bonefish@users.sf.net)
24//	Description:	A Watcher represents a target of a watching service.
25//					A WatcherFilter represents a predicate on Watchers.
26//------------------------------------------------------------------------------
27
28#ifndef WATCHER_H
29#define WATCHER_H
30
31#include <Messenger.h>
32
33// Watcher
34class Watcher {
35public:
36	Watcher(const BMessenger &target);
37	virtual ~Watcher();
38
39	const BMessenger &Target() const;
40
41	virtual status_t SendMessage(BMessage *message);
42
43private:
44	BMessenger	fTarget;
45};
46
47// WatcherFilter
48class WatcherFilter {
49public:
50	WatcherFilter();
51	virtual ~WatcherFilter();
52
53	virtual bool Filter(Watcher *watcher, BMessage *message);
54};
55
56#endif	// WATCHER_H
57