//------------------------------------------------------------------------------
//      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:              Watcher.h
//      Author:                 Ingo Weinhold (bonefish@users.sf.net)
//      Description:    A Watcher represents a target of a watching service.
//                                      A WatcherFilter represents a predicate on Watchers.
//------------------------------------------------------------------------------

#ifndef WATCHER_H
#define WATCHER_H

#include <Messenger.h>

// Watcher
class Watcher {
public:
        Watcher(const BMessenger &target);
        virtual ~Watcher();

        const BMessenger &Target() const;

        virtual status_t SendMessage(BMessage *message);

private:
        BMessenger      fTarget;
};

// WatcherFilter
class WatcherFilter {
public:
        WatcherFilter();
        virtual ~WatcherFilter();

        virtual bool Filter(Watcher *watcher, BMessage *message);
};

#endif  // WATCHER_H