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/*
* 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;
}
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
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