GraywaterAdapter.java 文件源码

/**
 * Note that this is an <i>O(n)</i> operation, but it does not query for the list of binders.
 *
 * @param itemPosition
 *      the position in the list of items.
 * @return the number of viewholders before the given item position.
 */
@VisibleForTesting
public int getViewHolderCount(final int itemPosition) {
    if (itemPosition >= 0 && !mItemPositionToFirstViewHolderPositionCache.isEmpty()) {
        if (itemPosition >= mItemPositionToFirstViewHolderPositionCache.size()) {
            return mViewHolderToItemPositionCache.size();
        } else {
            return mItemPositionToFirstViewHolderPositionCache.get(itemPosition);
        }
    } else {
        return 0;
    }
}