//------------------------------------------------------------------------------
//      Copyright (c) 2001-2002, Haiku
//
//      Permission is hereby granted, free of charge, to any person obtaining a
//      copy of this software and associated documentation files (the "Software"),
//      to deal in the Software without restriction, including without limitation
//      the rights to use, copy, modify, merge, publish, distribute, sublicense,
//      and/or sell copies of the Software, and to permit persons to whom the
//      Software is furnished to do so, subject to the following conditions:
//
//      The above copyright notice and this permission notice shall be included in
//      all copies or substantial portions of the Software.
//
//      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//      IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//      FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//      AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//      LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//      FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//      DEALINGS IN THE SOFTWARE.
//
//      File Name:              WatchingService.h
//      Author:                 Ingo Weinhold (bonefish@users.sf.net)
//      Description:    Features everything needed to provide a watching service.
//------------------------------------------------------------------------------

#ifndef WATCHING_SERVICE_H
#define WATCHING_SERVICE_H

#include <map>

#include <Messenger.h>

class Watcher;
class WatcherFilter;

class WatchingService {
public:
        WatchingService();
        virtual ~WatchingService();

        bool AddWatcher(Watcher *watcher);
        bool AddWatcher(const BMessenger &target);
        bool RemoveWatcher(Watcher *watcher, bool deleteWatcher = true);
        bool RemoveWatcher(const BMessenger &target, bool deleteWatcher = true);

        void NotifyWatchers(BMessage *message, WatcherFilter *filter = NULL);

private:
        typedef std::map<BMessenger,Watcher*> watcher_map;

private:
        watcher_map     fWatchers;
};

#endif  // WATCHING_SERVICE_H