> ## Documentation Index
> Fetch the complete documentation index at: https://docs.supernote.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ElementDataAccessor

> Accessor for large point datasets and the point data types it provides.

Point data is typically cached on the native side. On the RN side, you fetch data on demand via an accessor.

| Method                                  | Returns                                      | Description                                                      |
| --------------------------------------- | -------------------------------------------- | ---------------------------------------------------------------- |
| `size()`                                | `Promise<number>`                            | Get the dataset length                                           |
| `get(index)`                            | `Promise<T \| null>`                         | Get the item at `index`                                          |
| `getRange(startIndex, count)`           | `Promise<T[]>`                               | Get a range of items                                             |
| `add(index, value)`                     | `Promise<boolean>`                           | Insert an item at a specified position (clears cache on success) |
| `set(index, value)`                     | `Promise<boolean>`                           | Overwrite the item at `index` (clears cache on success)          |
| `setRange(index, endIndex, valueArray)` | `Promise<boolean>`                           | Overwrite a range of items (clears cache on success)             |
| `clearCache()`                          | `void`                                       | Clear the RN-side cache                                          |
| `getCacheStats()`                       | `{ cachedCount: number; totalSize: number }` | Get cache stats                                                  |
| `preload(startIndex, count)`            | `Promise<void>`                              | Preload a range into cache                                       |
| `isCached(index)`                       | `boolean`                                    | Whether an item is already cached                                |

## ElementPointDataType

Point data types exposed by `ElementDataAccessor` (enum).

| Enum                                          | Value | Description             |
| --------------------------------------------- | ----: | ----------------------- |
| `ElementPointDataType.ANGLE_POINT`            |   `0` | angle points            |
| `ElementPointDataType.CONTOUR_POINT`          |   `1` | contour points          |
| `ElementPointDataType.STROKE_SAMPLE_POINT`    |   `2` | strokesample points     |
| `ElementPointDataType.STROKE_PRESSURE_POINT`  |   `3` | stroke pressure points  |
| `ElementPointDataType.ERASE_LINE_DATA`        |   `4` | erase line data         |
| `ElementPointDataType.WRITE_FLAG`             |   `5` | write flag              |
| `ElementPointDataType.MARK_PEN_DIRECTION`     |   `6` | marker pen direction    |
| `ElementPointDataType.RECOGNITION_DATA_POINT` |   `7` | recognition data points |