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// Copyright 2017 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_UNSERIALIZED_MESSAGE_CONTEXT_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_UNSERIALIZED_MESSAGE_CONTEXT_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/optional.h"
#include "mojo/public/c/system/types.h"
#include "mojo/public/cpp/bindings/bindings_export.h"
#include "mojo/public/cpp/bindings/lib/buffer.h"
#include "mojo/public/cpp/bindings/lib/message_internal.h"
#include "mojo/public/cpp/bindings/lib/serialization_context.h"
namespace mojo {
namespace internal {
class MOJO_CPP_BINDINGS_EXPORT UnserializedMessageContext {
public:
struct Tag {};
UnserializedMessageContext(const Tag* tag,
uint32_t message_name,
uint32_t message_flags);
virtual ~UnserializedMessageContext();
template <typename MessageType>
MessageType* SafeCast() {
if (&MessageType::kMessageTag != tag_)
return nullptr;
return static_cast<MessageType*>(this);
}
const Tag* tag() const { return tag_; }
uint32_t message_name() const { return header_.name; }
uint32_t message_flags() const { return header_.flags; }
MessageHeaderV1* header() { return &header_; }
virtual void Serialize(SerializationContext* serialization_context,
Buffer* buffer) = 0;
private:
// The |tag_| is used for run-time type identification of specific
// unserialized message types, e.g. messages generated by mojom bindings. This
// allows opaque message objects to be safely downcast once pulled off a pipe.
const Tag* const tag_;
// We store message metadata in a serialized header structure to simplify
// Message implementation which needs to query such metadata for both
// serialized and unserialized message objects.
MessageHeaderV1 header_;
DISALLOW_COPY_AND_ASSIGN(UnserializedMessageContext);
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_UNSERIALIZED_MESSAGE_CONTEXT_H_