Line data    Source code

       1              : /*
       2              :  *    Copyright (c) 2021-2025 Project CHIP Authors
       3              :  *
       4              :  *    Licensed under the Apache License, Version 2.0 (the "License");
       5              :  *    you may not use this file except in compliance with the License.
       6              :  *    You may obtain a copy of the License at
       7              :  *
       8              :  *        http://www.apache.org/licenses/LICENSE-2.0
       9              :  *
      10              :  *    Unless required by applicable law or agreed to in writing, software
      11              :  *    distributed under the License is distributed on an "AS IS" BASIS,
      12              :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13              :  *    See the License for the specific language governing permissions and
      14              :  *    limitations under the License.
      15              :  */
      16              : #pragma once
      17              : 
      18              : #include <app/ConcreteAttributePath.h>
      19              : #include <lib/support/Span.h>
      20              : 
      21              : namespace chip {
      22              : namespace app {
      23              : 
      24              : /**
      25              :  * Interface for persisting attribute values.
      26              :  *
      27              :  * COMPATIBILITY NOTE:
      28              :  *   - This generally is assumed to write under a different key space from
      29              :  *     SafeAttributePersistenceProvider.
      30              :  */
      31              : class AttributePersistenceProvider
      32              : {
      33              : public:
      34           79 :     virtual ~AttributePersistenceProvider() = default;
      35              :     AttributePersistenceProvider()          = default;
      36              : 
      37              :     /**
      38              :      * Write an attribute value from the attribute store (i.e. not a struct or
      39              :      * list) to non-volatile memory.
      40              :      *
      41              :      * @param [in] aPath the attribute path for the data being written.
      42              :      * @param [in] aValue the data to write.
      43              :      */
      44              :     virtual CHIP_ERROR WriteValue(const ConcreteAttributePath & aPath, const ByteSpan & aValue) = 0;
      45              : 
      46              :     /**
      47              :      * Read an attribute value from non-volatile memory.
      48              :      *
      49              :      * @param [in]     aPath the attribute path for the data being persisted.
      50              :      * @param [in,out] aValue where to place the data.
      51              :      */
      52              :     virtual CHIP_ERROR ReadValue(const ConcreteAttributePath & aPath, MutableByteSpan & aValue) = 0;
      53              : };
      54              : 
      55              : } // namespace app
      56              : } // namespace chip