src/core/meshcop/dataset_local.hpp

/*
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 *     notice, this list of conditions and the following disclaimer in the
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 *     derived from this software without specific prior written permission.
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/**
 * @file
 *   This file includes definitions for managing MeshCoP Datasets.
 *
 */

#ifndef MESHCOP_DATASET_LOCAL_HPP_
#define MESHCOP_DATASET_LOCAL_HPP_

#include "openthread-core-config.h"

#include "common/locator.hpp"
#include "meshcop/dataset.hpp"
#include "meshcop/meshcop_tlvs.hpp"

namespace ot {
namespace MeshCoP {

class DatasetLocal : public InstanceLocator
{
public:
    /**
     * This constructor initializes the object.
     *
     * @param[in]  aInstance  A reference to an OpenThread instance.
     * @param[in]  aType      The type of the dataset, active or pending.
     *
     */
    DatasetLocal(Instance &aInstance, Dataset::Type aType);

    /**
     * This method indicates whether this is an Active or Pending Dataset.
     *
     * @retval Tlv::kActiveTimestamp when this is an Active Dataset.
     * @retval Tlv::kPendingTimetamp when this is a Pending Dataset.
     *
     */
    Dataset::Type GetType(void) const { return mType; }

    /**
     * This method clears the Dataset.
     *
     */
    void Clear(void);

    /**
     * This method indicates whether an Active or Pending Dataset is saved in non-volatile memory.
     *
     * @retval TRUE  if an Active or Pending Dataset is saved in non-volatile memory.
     * @retval FALSE if an Active or Pending Dataset is not saved in non-volatile memory.
     *
     */
    bool IsSaved(void) const { return mSaved; }

    /**
     * This method indicates whether an Active (Pending) Timestamp is present in the Active (Pending) Dataset.
     *
     * @retval TRUE  if an Active/Pending Timestamp is present.
     * @retval FALSE if an Active/Pending Timestamp is not present.
     *
     */
    bool IsTimestampPresent(void) const { return mTimestampPresent; }

    /**
     * This method restores and retrieves the dataset from non-volatile memory.
     *
     * This method also sets the memory-cached timestamp for subsequent calls to `Compare()`.
     *
     * @param[out]  aDataset  Where to place the dataset.
     *
     * @retval OT_ERROR_NONE       Successfully retrieved the dataset.
     * @retval OT_ERROR_NOT_FOUND  There is no corresponding dataset stored in non-volatile memory.
     *
     */
    otError Restore(Dataset &aDataset);

    /**
     * This method retrieves the dataset from non-volatile memory.
     *
     * @param[out]  aDataset  Where to place the dataset.
     *
     * @retval OT_ERROR_NONE       Successfully retrieved the dataset.
     * @retval OT_ERROR_NOT_FOUND  There is no corresponding dataset stored in non-volatile memory.
     *
     */
    otError Read(Dataset &aDataset) const;

    /**
     * This method retrieves the dataset from non-volatile memory.
     *
     * @param[out]  aDataset  Where to place the dataset.
     *
     * @retval OT_ERROR_NONE       Successfully retrieved the dataset.
     * @retval OT_ERROR_NOT_FOUND  There is no corresponding dataset stored in non-volatile memory.
     *
     */
    otError Read(otOperationalDataset &aDataset) const;

    /**
     * This method retrieves the dataset from non-volatile memory.
     *
     * @param[out]  aDataset  Where to place the dataset.
     *
     * @retval OT_ERROR_NONE       Successfully retrieved the dataset.
     * @retval OT_ERROR_NOT_FOUND  There is no corresponding dataset stored in non-volatile memory.
     *
     */
    otError Read(otOperationalDatasetTlvs &aDataset) const;

    /**
     * This method returns the local time this dataset was last updated or restored.
     *
     * @returns The local time this dataset was last updated or restored.
     *
     */
    TimeMilli GetUpdateTime(void) const { return mUpdateTime; }

    /**
     * This method stores the dataset into non-volatile memory.
     *
     * @retval OT_ERROR_NONE              Successfully saved the dataset.
     * @retval OT_ERROR_NOT_IMPLEMENTED   The platform does not implement settings functionality.
     *
     */
    otError Save(const otOperationalDataset &aDataset);

    /**
     * This method stores the dataset into non-volatile memory.
     *
     * @retval OT_ERROR_NONE              Successfully saved the dataset.
     * @retval OT_ERROR_NOT_IMPLEMENTED   The platform does not implement settings functionality.
     *
     */
    otError Save(const otOperationalDatasetTlvs &aDataset);

    /**
     * This method stores the dataset into non-volatile memory.
     *
     * @retval OT_ERROR_NONE              Successfully saved the dataset.
     * @retval OT_ERROR_NOT_IMPLEMENTED   The platform does not implement settings functionality.
     *
     */
    otError Save(const Dataset &aDataset);

    /**
     * This method compares this dataset to another based on the timestamp.
     *
     * @param[in]  aCompare  A reference to the timestamp to compare.
     *
     * @retval -1  if @p aCompare is older than this dataset.
     * @retval  0  if @p aCompare is equal to this dataset.
     * @retval  1  if @p aCompare is newer than this dataset.
     *
     */
    int Compare(const Timestamp *aCompare);

private:
    bool IsActive(void) const { return (mType == Dataset::kActive); }
    void SetTimestamp(const Dataset &aDataset);

    Timestamp     mTimestamp;            ///< Active or Pending Timestamp
    TimeMilli     mUpdateTime;           ///< Local time last updated
    Dataset::Type mType;                 ///< Active or Pending
    bool          mTimestampPresent : 1; ///< Whether a timestamp is present
    bool          mSaved : 1;            ///< Whether a dataset is saved in non-volatile
};

} // namespace MeshCoP
} // namespace ot

#endif // MESHCOP_DATASET_LOCAL_HPP_