added local parameter handler

bsp_q7s/memory/LocalParameterHandler.h

@@ -31,7 +31,8 @@ class LocalParameterHandler : public NVMParameterBase {
   ReturnValue_t initialize();
 
   /**
-   * @brief Function to add parameter to json file
+   * @brief Function to add parameter to json file. If the json file does
+   * 				not yet exist it will be created here.
    *
    * @param key	The string to identify the parameter
    * @param value	The value to set for this parameter
@@ -43,6 +44,17 @@ class LocalParameterHandler : public NVMParameterBase {
    */
   template<typename T> ReturnValue_t addParameter(std::string key, T value);
 
+  /**
+   * @brief	Function will update a parameter which already exists in the json
+   * 				file
+   *
+   * @param key 	The unique string to identify the parameter to update
+   * @param value The new new value to set
+   *
+   * @return OK if successful, otherwise error return value
+   */
+  template<typename T> ReturnValue_t updateParameter(std::string key, T value);
+
  private:
 
   // Name relative to mount point of SD card where parameters will be stored
@@ -63,4 +75,16 @@ template<typename T> inline ReturnValue_t LocalParameterHandler::addParameter(st
 	return returnvalue::OK;
 }
 
+template<typename T> inline ReturnValue_t LocalParameterHandler::updateParameter(std::string key, T value) {
+	ReturnValue_t result = setValue(key, value);
+	if (result != returnvalue::OK) {
+		return result;
+	}
+	result = writeJsonFile();
+	if (result != returnvalue::OK) {
+		return result;
+	}
+	return returnvalue::OK;
+}
+
 #endif /* BSP_Q7S_MEMORY_LOCALPARAMETERHANDLER_H_ */