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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_FILTER_H_
#define MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_FILTER_H_
#include "mojo/public/cpp/bindings/message.h"
#include "mojo/public/cpp/system/macros.h"
namespace mojo {
// This class is the base class for message filters. Subclasses should
// implement the pure virtual method Accept() inherited from MessageReceiver to
// process messages and/or forward them to |sink_|.
class MessageFilter : public MessageReceiver {
public:
// Doesn't take ownership of |sink|. Therefore |sink| has to stay alive while
// this object is alive.
explicit MessageFilter(MessageReceiver* sink = nullptr);
~MessageFilter() override;
void set_sink(MessageReceiver* sink) { sink_ = sink; }
protected:
MessageReceiver* sink_;
};
// A trivial filter that simply forwards every message it receives to |sink_|.
class PassThroughFilter : public MessageFilter {
public:
explicit PassThroughFilter(MessageReceiver* sink = nullptr);
bool Accept(Message* message) override;
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_MESSAGE_FILTER_H_
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