| /* |
| * Copyright (C) 2020 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 <binder/Parcel.h> |
| #include <binder/Parcelable.h> |
| #include <utils/String16.h> |
| #include <mutex> |
| #include <optional> |
| #include <tuple> |
| |
| namespace android { |
| namespace os { |
| /* |
| * C++ implementation of the Java class android.os.ParcelableHolder |
| */ |
| class ParcelableHolder : public android::Parcelable { |
| public: |
| ParcelableHolder() = delete; |
| explicit ParcelableHolder(Stability stability) : mStability(stability){} |
| virtual ~ParcelableHolder() = default; |
| ParcelableHolder(const ParcelableHolder& other) { |
| mParcelable = other.mParcelable; |
| mParcelableName = other.mParcelableName; |
| if (other.mParcelPtr) { |
| mParcelPtr = std::make_unique<Parcel>(); |
| mParcelPtr->appendFrom(other.mParcelPtr.get(), 0, other.mParcelPtr->dataSize()); |
| } |
| mStability = other.mStability; |
| } |
| ParcelableHolder(ParcelableHolder&& other) = default; |
| |
| status_t writeToParcel(Parcel* parcel) const override; |
| status_t readFromParcel(const Parcel* parcel) override; |
| |
| void reset() { |
| this->mParcelable = nullptr; |
| this->mParcelableName = std::nullopt; |
| this->mParcelPtr = nullptr; |
| } |
| |
| template <typename T> |
| status_t setParcelable(T&& p) { |
| using Tt = typename std::decay<T>::type; |
| return setParcelable<Tt>(std::make_shared<Tt>(std::forward<T>(p))); |
| } |
| |
| template <typename T> |
| status_t setParcelable(std::shared_ptr<T> p) { |
| static_assert(std::is_base_of<Parcelable, T>::value, "T must be derived from Parcelable"); |
| if (p && this->getStability() > p->getStability()) { |
| return android::BAD_VALUE; |
| } |
| this->mParcelable = p; |
| this->mParcelableName = T::getParcelableDescriptor(); |
| this->mParcelPtr = nullptr; |
| return android::OK; |
| } |
| |
| template <typename T> |
| status_t getParcelable(std::shared_ptr<T>* ret) const { |
| static_assert(std::is_base_of<Parcelable, T>::value, "T must be derived from Parcelable"); |
| const String16& parcelableDesc = T::getParcelableDescriptor(); |
| if (!this->mParcelPtr) { |
| if (!this->mParcelable || !this->mParcelableName) { |
| ALOGD("empty ParcelableHolder"); |
| *ret = nullptr; |
| return android::OK; |
| } else if (parcelableDesc != *mParcelableName) { |
| ALOGD("extension class name mismatch expected:%s actual:%s", |
| String8(*mParcelableName).c_str(), String8(parcelableDesc).c_str()); |
| *ret = nullptr; |
| return android::BAD_VALUE; |
| } |
| *ret = std::shared_ptr<T>(mParcelable, reinterpret_cast<T*>(mParcelable.get())); |
| return android::OK; |
| } |
| this->mParcelPtr->setDataPosition(0); |
| status_t status = this->mParcelPtr->readString16(&this->mParcelableName); |
| if (status != android::OK || parcelableDesc != this->mParcelableName) { |
| this->mParcelableName = std::nullopt; |
| *ret = nullptr; |
| return status; |
| } |
| this->mParcelable = std::make_shared<T>(); |
| status = mParcelable.get()->readFromParcel(this->mParcelPtr.get()); |
| if (status != android::OK) { |
| this->mParcelableName = std::nullopt; |
| this->mParcelable = nullptr; |
| *ret = nullptr; |
| return status; |
| } |
| this->mParcelPtr = nullptr; |
| *ret = std::shared_ptr<T>(mParcelable, reinterpret_cast<T*>(mParcelable.get())); |
| return android::OK; |
| } |
| |
| Stability getStability() const override { return mStability; } |
| |
| inline bool operator!=(const ParcelableHolder& rhs) const { |
| return this != &rhs; |
| } |
| inline bool operator<(const ParcelableHolder& rhs) const { |
| return this < &rhs; |
| } |
| inline bool operator<=(const ParcelableHolder& rhs) const { |
| return this <= &rhs; |
| } |
| inline bool operator==(const ParcelableHolder& rhs) const { |
| return this == &rhs; |
| } |
| inline bool operator>(const ParcelableHolder& rhs) const { |
| return this > &rhs; |
| } |
| inline bool operator>=(const ParcelableHolder& rhs) const { |
| return this >= &rhs; |
| } |
| |
| private: |
| mutable std::shared_ptr<Parcelable> mParcelable; |
| mutable std::optional<String16> mParcelableName; |
| mutable std::unique_ptr<Parcel> mParcelPtr; |
| Stability mStability; |
| }; |
| } // namespace os |
| } // namespace android |