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/*
* Copyright (C) 2016 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.
*/
#ifndef ANDROID_SENSOR_SERVICE_UTIL_SENSOR_LIST_H
#define ANDROID_SENSOR_SERVICE_UTIL_SENSOR_LIST_H
#include "SensorInterface.h"
#include "SensorServiceUtils.h"
#include <sensor/Sensor.h>
#include <utils/String8.h>
#include <utils/Vector.h>
#include <map>
#include <mutex>
#include <unordered_set>
#include <vector>
namespace android {
class SensorInterface;
namespace SensorServiceUtil {
class SensorList : public Dumpable {
public:
// After SensorInterface * is added into SensorList, it can be assumed that SensorList own the
// object it pointed to and the object should not be released elsewhere.
bool add(int handle, SensorInterface* si, bool isForDebug = false, bool isVirtual = false);
// After a handle is removed, the object that SensorInterface * pointing to may get deleted if
// no more sp<> of the same object exist.
bool remove(int handle);
inline bool hasAnySensor() const { return mHandleMap.size() > 0;}
//helper functions
const Vector<Sensor> getUserSensors() const;
const Vector<Sensor> getUserDebugSensors() const;
const Vector<Sensor> getDynamicSensors() const;
const Vector<Sensor> getVirtualSensors() const;
String8 getName(int handle) const;
sp<SensorInterface> getInterface(int handle) const;
bool isNewHandle(int handle) const;
// Iterate through Sensor in sensor list and perform operation f on each Sensor object.
//
// TF is a function with the signature:
// bool f(const Sensor &);
// A return value of 'false' stops the iteration immediately.
//
// Note: in the function f, it is illegal to make calls to member functions of the same
// SensorList object on which forEachSensor is invoked.
template <typename TF>
void forEachSensor(const TF& f) const;
const Sensor& getNonSensor() const { return mNonSensor;}
// Dumpable interface
virtual std::string dump() const override;
virtual ~SensorList();
private:
struct Entry {
sp<SensorInterface> si;
const bool isForDebug;
const bool isVirtual;
Entry(SensorInterface* si_, bool debug_, bool virtual_) :
si(si_), isForDebug(debug_), isVirtual(virtual_) {
}
};
const static Sensor mNonSensor; //.getName() == "unknown",
// Iterate through Entry in sensor list and perform operation f on each Entry.
//
// TF is a function with the signature:
// bool f(const Entry &);
// A return value of 'false' stops the iteration over entries immediately.
//
// Note: in the function being passed in, it is illegal to make calls to member functions of the
// same SensorList object on which forEachSensor is invoked.
template <typename TF>
void forEachEntry(const TF& f) const;
template <typename T, typename TF>
T getOne(int handle, const TF& accessor, T def = T()) const;
mutable std::mutex mLock;
std::map<int, Entry> mHandleMap;
std::unordered_set<int> mUsedHandle;
};
template <typename TF>
void SensorList::forEachSensor(const TF& f) const {
// lock happens in forEachEntry
forEachEntry([&f] (const Entry& e) -> bool { return f(e.si->getSensor());});
}
template <typename TF>
void SensorList::forEachEntry(const TF& f) const {
std::lock_guard<std::mutex> lk(mLock);
for (auto&& i : mHandleMap) {
if (!f(i.second)){
break;
}
}
}
template <typename T, typename TF>
T SensorList::getOne(int handle, const TF& accessor, T def) const {
std::lock_guard<std::mutex> lk(mLock);
auto i = mHandleMap.find(handle);
if (i != mHandleMap.end()) {
return accessor(i->second);
} else {
return def;
}
}
} // namespace SensorServiceUtil
} // namespace android
#endif // ANDROID_SENSOR_SERVICE_UTIL_SENSOR_LIST_H
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