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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_LIB_FILTER_CHAIN_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_FILTER_CHAIN_H_
#include <utility>
#include <vector>
#include "base/macros.h"
#include "mojo/public/cpp/bindings/message.h"
#include "mojo/public/cpp/bindings/message_filter.h"
namespace mojo {
namespace internal {
class FilterChain {
public:
// Doesn't take ownership of |sink|. Therefore |sink| has to stay alive while
// this object is alive.
explicit FilterChain(MessageReceiver* sink = nullptr);
FilterChain(FilterChain&& other);
FilterChain& operator=(FilterChain&& other);
~FilterChain();
template <typename FilterType, typename... Args>
inline void Append(Args&&... args);
// Doesn't take ownership of |sink|. Therefore |sink| has to stay alive while
// this object is alive.
void SetSink(MessageReceiver* sink);
// Returns a receiver to accept messages. Messages flow through all filters in
// the same order as they were appended to the chain. If all filters allow a
// message to pass, it will be forwarded to |sink_|.
// The returned value is invalidated when this object goes away.
MessageReceiver* GetHead();
private:
// Owned by this object.
// TODO(dcheng): Use unique_ptr.
std::vector<MessageFilter*> filters_;
MessageReceiver* sink_;
DISALLOW_COPY_AND_ASSIGN(FilterChain);
};
template <typename FilterType, typename... Args>
inline void FilterChain::Append(Args&&... args) {
FilterType* filter = new FilterType(std::forward<Args>(args)..., sink_);
if (!filters_.empty())
filters_.back()->set_sink(filter);
filters_.push_back(filter);
}
template <>
inline void FilterChain::Append<PassThroughFilter>() {
}
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_FILTER_CHAIN_H_
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