function _loadExecutionFromJson()

in src/persistence/load.ts [59:133]
39 lines of code
11 McCabe index (conditional complexity)

function _loadExecutionFromJson(executionJson: JSONObject): CellExecution<LogCell> {
  function _getString(json: JSONObject, key: string): string {
    if (!json.hasOwnProperty(key) || typeof json[key] != "string") {
      log("Could not find key " + key + "in object " + json);
      return null;
    }
    return json[key] as string;
  }

  function _getNumber(json: JSONObject, key: string): number {
    if (!json.hasOwnProperty(key) || typeof json[key] != "number") {
      log("Could not find key " + key + "in object " + json);
      return null;
    }
    return json[key] as number;
  }

  function _getBoolean(json: JSONObject, key: string): boolean {
    if (!json.hasOwnProperty(key) || typeof json[key] != "boolean") {
      log("Could not find key " + key + "in object " + json);
      return null;
    }
    return json[key] as boolean;
  }

  function _getOutputs(json: JSONObject): nbformat.IOutput[] {
    if (!json.hasOwnProperty("outputs") || !JSONExt.isArray(json["outputs"])) {
      log("Could not find outputs in object " + json);
      return null;
    }
    return json["outputs"] as nbformat.IOutput[];
  }

  if (!executionJson.hasOwnProperty("cell") || !JSONExt.isObject(executionJson["cell"])) {
    log("Unexpected cell data format: cell is not an object");
    return null;
  }
  let cellJson = executionJson["cell"] as JSONObject;

  let id = _getString(cellJson, "id");
  let executionCount = _getNumber(cellJson, "executionCount");
  let persistentId = _getString(cellJson, "persistentId");
  let executionEventId = _getString(cellJson, "executionEventId");
  let hasError = _getBoolean(cellJson, "hasError");
  let text = _getString(cellJson, "text");
  let outputs = _getOutputs(cellJson);

  let executionTimeString = _getString(executionJson, "executionTime");
  let executionTime = new Date(executionTimeString);

  if (
    id == null ||
    executionCount == null ||
    hasError == null ||
    persistentId == null ||
    executionEventId == null ||
    text == null ||
    executionTime == null ||
    outputs == null
  ) {
    log("Cell could not be loaded, as it's missing a critical field.");
    return null;
  }

  let cell = new LogCell({
    id,
    executionCount,
    hasError,
    text,
    persistentId,
    executionEventId,
    outputs
  });
  return new CellExecution(cell, executionTime);
}