| /* |
| * Copyright 2023 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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. |
| */ |
| |
| #pragma once |
| |
| #include <android-base/expected.h> |
| #include <utils/Errors.h> |
| |
| namespace android::ui { |
| |
| enum class ErrorCode : int32_t { |
| /** |
| * No error. |
| */ |
| None = 0, |
| /** |
| * Invalid BufferDescriptor. |
| */ |
| BadDescriptor = 1, |
| /** |
| * Invalid buffer handle. |
| */ |
| BadBuffer = 2, |
| /** |
| * Invalid HardwareBufferDescription. |
| */ |
| BadValue = 3, |
| /** |
| * Resource unavailable. |
| */ |
| NoResources = 5, |
| /** |
| * Permanent failure. |
| */ |
| Unsupported = 7, |
| }; |
| |
| class Error { |
| public: |
| Error(ErrorCode err) : mCode(err) {} |
| |
| Error(ErrorCode err, std::string&& message) : mCode(err), mMessage(std::move(message)) {} |
| Error(ErrorCode err, const std::string_view& message) : mCode(err), mMessage(message) {} |
| |
| static constexpr status_t codeToStatus(ErrorCode code) { |
| switch (code) { |
| case ErrorCode::None: |
| return OK; |
| case ErrorCode::BadDescriptor: |
| return BAD_VALUE; |
| case ErrorCode::BadValue: |
| return BAD_VALUE; |
| case ErrorCode::BadBuffer: |
| return BAD_TYPE; |
| case ErrorCode::NoResources: |
| return NO_MEMORY; |
| case ErrorCode::Unsupported: |
| return INVALID_OPERATION; |
| default: |
| return UNKNOWN_ERROR; |
| } |
| } |
| |
| static constexpr ErrorCode statusToCode(status_t status) { |
| switch (status) { |
| case OK: |
| return ErrorCode::None; |
| case BAD_VALUE: |
| return ErrorCode::BadValue; |
| case BAD_TYPE: |
| return ErrorCode::BadBuffer; |
| case NO_MEMORY: |
| return ErrorCode::NoResources; |
| case INVALID_OPERATION: |
| return ErrorCode::Unsupported; |
| default: |
| return ErrorCode::Unsupported; |
| } |
| } |
| |
| constexpr status_t asStatus() const { return codeToStatus(mCode); } |
| |
| ErrorCode code() const { return mCode; } |
| |
| const std::string& message() const { return mMessage; } |
| |
| bool operator==(const ErrorCode code) { return mCode == code; } |
| |
| private: |
| ErrorCode mCode; |
| std::string mMessage; |
| }; |
| |
| template <typename T> |
| class Result : public base::expected<T, Error> { |
| public: |
| using base::expected<T, Error>::expected; |
| |
| [[nodiscard]] constexpr status_t asStatus() const { |
| return this->has_value() ? OK : this->error().asStatus(); |
| } |
| |
| [[nodiscard]] constexpr ErrorCode errorCode() const { |
| return this->has_value() ? ErrorCode::None : this->error().code(); |
| } |
| }; |
| |
| } // namespace android::ui |