100 lines
4.1 KiB
C++
100 lines
4.1 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2023 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef GOOGLE_PROTOBUF_FEATURE_RESOLVER_H__
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#define GOOGLE_PROTOBUF_FEATURE_RESOLVER_H__
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#include <memory>
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#include <string>
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#include <utility>
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#include "absl/container/flat_hash_set.h"
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#include "absl/status/status.h"
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#include "absl/strings/string_view.h"
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#include "google/protobuf/descriptor.h"
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#include "google/protobuf/descriptor.pb.h"
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#include "google/protobuf/dynamic_message.h"
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// Must be included last.
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#include "google/protobuf/port_def.inc"
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namespace google {
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namespace protobuf {
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// These helpers implement the unique behaviors of edition features. For more
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// details, see go/protobuf-editions-features.
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class PROTOBUF_EXPORT FeatureResolver {
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public:
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FeatureResolver(FeatureResolver&&) = default;
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FeatureResolver& operator=(FeatureResolver&&) = delete;
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// Creates a new FeatureResolver at a specific edition. This validates the
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// built-in features for the given edition, and calculates the default feature
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// set.
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static absl::StatusOr<FeatureResolver> Create(absl::string_view edition,
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const Descriptor* descriptor);
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// Registers a potential extension of the FeatureSet proto. Any visible
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// extensions will be used during merging. Returns an error if the extension
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// is a feature extension but fails validation.
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absl::Status RegisterExtensions(const FileDescriptor& file);
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// Creates a new feature set using inheritance and default behavior. This is
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// designed to be called recursively, and the parent feature set is expected
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// to be a fully merged one.
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absl::StatusOr<FeatureSet> MergeFeatures(
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const FeatureSet& merged_parent, const FeatureSet& unmerged_child) const;
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private:
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FeatureResolver(absl::string_view edition, const Descriptor& descriptor,
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std::unique_ptr<DynamicMessageFactory> message_factory,
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std::unique_ptr<Message> defaults)
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: edition_(edition),
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descriptor_(descriptor),
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message_factory_(std::move(message_factory)),
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defaults_(std::move(defaults)) {}
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absl::Status RegisterExtensions(const Descriptor& message);
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absl::Status RegisterExtension(const FieldDescriptor& extension);
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std::string edition_;
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const Descriptor& descriptor_;
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absl::flat_hash_set<const FieldDescriptor*> extensions_;
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std::unique_ptr<DynamicMessageFactory> message_factory_;
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std::unique_ptr<Message> defaults_;
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};
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_FEATURE_RESOLVER_H__
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#include "google/protobuf/port_undef.inc"
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