private _validateDeviceMethodInputs()

in device/core/src/internal_client.ts [390:414]

• 17 lines of code
• 6 McCabe index (conditional complexity)

  private _validateDeviceMethodInputs(methodName: string, callback: (request: DeviceMethodRequest, response: DeviceMethodResponse) => void): void {
    // Codes_SRS_NODE_INTERNAL_CLIENT_13_020: [ onDeviceMethod shall throw a ReferenceError if methodName is falsy. ]
    if (!methodName) {
      throw new ReferenceError('methodName cannot be \'' + methodName + '\'');
    }
    // Codes_SRS_NODE_INTERNAL_CLIENT_13_024: [ onDeviceMethod shall throw a TypeError if methodName is not a string. ]
    if (typeof (methodName) !== 'string') {
      throw new TypeError('methodName\'s type is \'' + typeof (methodName) + '\'. A string was expected.');
    }

    // Codes_SRS_NODE_INTERNAL_CLIENT_13_022: [ onDeviceMethod shall throw a ReferenceError if callback is falsy. ]
    if (!callback) {
      throw new ReferenceError('callback cannot be \'' + callback + '\'');
    }

    // Codes_SRS_NODE_INTERNAL_CLIENT_13_025: [ onDeviceMethod shall throw a TypeError if callback is not a Function. ]
    if (typeof (callback) !== 'function') {
      throw new TypeError('callback\'s type is \'' + typeof (callback) + '\'. A function reference was expected.');
    }

    // Codes_SRS_NODE_INTERNAL_CLIENT_13_023: [ onDeviceMethod shall throw an Error if a listener is already subscribed for a given method call. ]
    if (this._methodCallbackMap[methodName]) {
      throw new Error('A handler for this method has already been registered with the client.');
    }
  }