fsfw/datapool/PIDReader.h

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/*
* PIDReader.h
*
* Created on: 14.05.2014
* Author: baetz
*/
#ifndef PIDREADER_H_
#define PIDREADER_H_
#include <framework/datapool/DataPool.h>
#include <framework/datapool/DataSetIF.h>
#include <framework/datapool/PoolEntry.h>
#include <framework/datapool/PoolVariableIF.h>
#include <framework/serialize/SerializeAdapter.h>
#include <framework/serviceinterface/ServiceInterfaceStream.h>
template<typename U, uint8_t n_var> class PIDReaderList;
template<typename T>
class PIDReader: public PoolVariableIF {
template<typename U, uint8_t n_var> friend class PIDReaderList;
protected:
uint32_t parameterId;
uint8_t valid;
ReturnValue_t read() {
uint8_t arrayIndex = DataPool::PIDToArrayIndex(parameterId);
PoolEntry<T>* read_out = ::dataPool.getData<T>(
DataPool::PIDToDataPoolId(parameterId), arrayIndex);
if (read_out != NULL) {
valid = read_out->valid;
value = read_out->address[arrayIndex];
return HasReturnvaluesIF::RETURN_OK;
} else {
value = 0;
valid = false;
error << "PIDReader: read of PID 0x" << std::hex << parameterId
<< std::dec << " failed." << std::endl;
return HasReturnvaluesIF::RETURN_FAILED;
}
}
/**
* Never commit, is read-only.
* Reason is the possibility to access a single DP vector element, but if we commit,
* we set validity of the whole vector.
*/
ReturnValue_t commit() {
return HasReturnvaluesIF::RETURN_FAILED;
}
/**
* Empty ctor for List initialization
*/
PIDReader() :
parameterId(PoolVariableIF::NO_PARAMETER), valid(PoolVariableIF::INVALID), value(0) {
}
public:
/**
* \brief This is the local copy of the data pool entry.
*/
T value;
/**
* \brief In the constructor, the variable can register itself in a DataSet (if not NULL is
* passed).
* \details It DOES NOT fetch the current value from the data pool, but sets the value
* attribute to default (0). The value is fetched within the read() operation.
* \param set_id This is the id in the global data pool this instance of the access class
* corresponds to.
* \param dataSet The data set in which the variable shall register itself. If NULL,
* the variable is not registered.
* \param setWritable If this flag is set to true, changes in the value attribute can be
* written back to the data pool, otherwise not.
*/
PIDReader(uint32_t setParameterId, DataSetIF* dataSet) :
parameterId(setParameterId), valid(
PoolVariableIF::INVALID), value(0) {
if (dataSet != NULL) {
dataSet->registerVariable(this);
}
}
/**
* Copy ctor to copy classes containing Pool Variables.
*/
PIDReader(const PIDReader& rhs) :
parameterId(rhs.parameterId), valid(rhs.valid), value(rhs.value) {
}
/**
* \brief The classes destructor is empty.
*/
~PIDReader() {
}
/**
* \brief This operation returns the data pool id of the variable.
*/
uint32_t getDataPoolId() const {
return DataPool::PIDToDataPoolId(parameterId);
}
uint32_t getParameterId() const {
return parameterId;
}
/**
* This method returns if the variable is write-only, read-write or read-only.
*/
ReadWriteMode_t getReadWriteMode() const {
return VAR_READ;
}
/**
* \brief With this call, the valid information of the variable is returned.
*/
bool isValid() const {
if (valid)
return true;
else
return false;
}
uint8_t getValid() {
return valid;
}
void setValid(uint8_t valid) {
this->valid = valid;
}
operator T() {
return value;
}
PIDReader<T> &operator=(T newValue) {
value = newValue;
return *this;
}
virtual ReturnValue_t serialize(uint8_t** buffer, uint32_t* size,
const uint32_t max_size, bool bigEndian) const {
return SerializeAdapter<T>::serialize(&value, buffer, size, max_size,
bigEndian);
}
virtual uint32_t getSerializedSize() const {
return SerializeAdapter<T>::getSerializedSize(&value);
}
virtual ReturnValue_t deSerialize(const uint8_t** buffer, int32_t* size,
bool bigEndian) {
return SerializeAdapter<T>::deSerialize(&value, buffer, size, bigEndian);
}
};
#endif /* PIDREADER_H_ */