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 34 class Watcher { 35 public: 36 Watcher(const BMessenger &target); 37 virtual ~Watcher(); 38 39 const BMessenger &Target() const; 40 41 virtual status_t SendMessage(BMessage *message); 42 43 private: 44 BMessenger fTarget; 45 }; 46 47 // WatcherFilter 48 class WatcherFilter { 49 public: 50 WatcherFilter(); 51 virtual ~WatcherFilter(); 52 53 virtual bool Filter(Watcher *watcher, BMessage *message); 54 }; 55 56 #endif // WATCHER_H 57