/**
* Moves the given {@link RBookListItem}s to the start of {@code bookList}.
*
* @param realm Instance of Realm to use.
* @param bookList Book list which owns {@code itemsToMove}.
* @param itemsToMove Items to move. Items must already exist in Realm and be owned by {@code
* bookList}.
*/
public static void moveItemsToStart(
Realm realm, RBookList bookList, List<RBookListItem> itemsToMove) {
bookList.throwIfSmartList();
if (itemsToMove == null || itemsToMove.isEmpty()) return;
realm.executeTransaction(
tRealm -> {
// Get the next first open position.
Long nextFirstPos = bookList.listItems.where().min("pos").longValue() - C.LIST_ITEM_GAP;
// Loop through itemsToMove backwards and move those items to the start of this list.
for (int i = itemsToMove.size() - 1; i >= 0; i--) {
itemsToMove.get(i).pos = nextFirstPos;
nextFirstPos -= C.LIST_ITEM_GAP;
}
});
}
/**
* Moves the given {@link RBookListItem}s to the end of {@code bookList}.
*
* @param realm Instance of Realm to use.
* @param bookList Book list which owns {@code itemsToMove}.
* @param itemsToMove Items to move. Items must already exist in Realm and be owned by {@code
* bookList}.
*/
public static void moveItemsToEnd(
Realm realm, RBookList bookList, List<RBookListItem> itemsToMove) {
bookList.throwIfSmartList();
if (itemsToMove == null || itemsToMove.isEmpty()) return;
realm.executeTransaction(
tRealm -> {
// Get the next last open position.
Long nextLastPos = bookList.nextPos;
// Loop through itemsToMove and move those items to the end of this list.
for (RBookListItem item : itemsToMove) {
item.pos = nextLastPos;
nextLastPos += C.LIST_ITEM_GAP;
}
// Set bookList's nextPos.
bookList.nextPos = nextLastPos;
});
}