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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef THIRD_PARTY_CEL_CPP_EXTENSIONS_PROTOBUF_ENUM_VALUE_H_
#define THIRD_PARTY_CEL_CPP_EXTENSIONS_PROTOBUF_ENUM_VALUE_H_
#include <type_traits>
#include "absl/base/macros.h"
#include "absl/types/optional.h"
#include "base/values/enum_value.h"
#include "extensions/protobuf/enum_type.h"
#include "google/protobuf/descriptor.h"
#include "google/protobuf/generated_enum_reflection.h"
#include "google/protobuf/generated_enum_util.h"
namespace cel::extensions {
class ProtoEnumValue final {
public:
static bool Is(const EnumValue& value) {
return value.type()->Is<ProtoEnumType>();
}
static bool Is(const Handle<EnumValue>& value) { return Is(*value); }
// Retrieves the underlying google::protobuf::EnumValueDescriptor, nullptr is returned
// if the corresponding google::protobuf::EnumValueDescriptor does not exist.
static const google::protobuf::EnumValueDescriptor* descriptor(const EnumValue& value);
static const google::protobuf::EnumValueDescriptor* descriptor(
const Handle<EnumValue>& value) {
return descriptor(*value);
}
// Converts EnumValue into E, an empty optional is returned if the value
// cannot be represented as E.
template <typename E>
static std::enable_if_t<google::protobuf::is_proto_enum<E>::value, absl::optional<E>>
value(const EnumValue& value) {
ABSL_ASSERT(Is(value));
auto maybe = value_impl(*value.type().As<ProtoEnumType>(), value.number(),
google::protobuf::GetEnumDescriptor<E>());
if (!maybe.has_value()) {
return absl::nullopt;
}
return static_cast<E>(*maybe);
}
template <typename E>
static std::enable_if_t<google::protobuf::is_proto_enum<E>::value, absl::optional<E>>
value(const Handle<EnumValue>& value) {
return ProtoEnumValue::value<E>(*value);
}
private:
static absl::optional<int> value_impl(const ProtoEnumType& type,
int64_t number,
const google::protobuf::EnumDescriptor* desc);
ProtoEnumValue() = delete;
ProtoEnumValue(const ProtoEnumValue&) = delete;
ProtoEnumValue(ProtoEnumValue&&) = delete;
~ProtoEnumValue() = delete;
ProtoEnumValue& operator=(const ProtoEnumValue&) = delete;
ProtoEnumValue& operator=(ProtoEnumValue&&) = delete;
};
} // namespace cel::extensions
#endif // THIRD_PARTY_CEL_CPP_EXTENSIONS_PROTOBUF_ENUM_VALUE_H_