1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_FILTER_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_FILTER_H_ 7 8 #include "mojo/public/cpp/bindings/message.h" 9 10 namespace mojo { 11 12 // This class is the base class for message filters. Subclasses should 13 // implement the pure virtual method Accept() inherited from MessageReceiver to 14 // process messages and/or forward them to |sink_|. 15 class MessageFilter : public MessageReceiver { 16 public: 17 // Doesn't take ownership of |sink|. Therefore |sink| has to stay alive while 18 // this object is alive. 19 explicit MessageFilter(MessageReceiver* sink = nullptr); 20 ~MessageFilter() override; 21 22 void set_sink(MessageReceiver* sink) { sink_ = sink; } 23 24 protected: 25 MessageReceiver* sink_; 26 }; 27 28 // A trivial filter that simply forwards every message it receives to |sink_|. 29 class PassThroughFilter : public MessageFilter { 30 public: 31 explicit PassThroughFilter(MessageReceiver* sink = nullptr); 32 33 bool Accept(Message* message) override; 34 }; 35 36 } // namespace mojo 37 38 #endif // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_FILTER_H_ 39
