function BookManager::moveChildren

Moves children from the original parent to the updated link.

Parameters

array $link: The link being saved.

array $original: The original parent of $link.

File

core/modules/book/src/BookManager.php, line 897

Class

BookManager

Defines a book manager.

Namespace

Code

protected function moveChildren(array $link, array $original) {
    $p = 'p1';
    $expressions = [];
    for ($i = 1; $i <= $link['depth']; $p = 'p' . ++$i) {
        $expressions[] = [
            $p,
            ":p_{$i}",
            [
                ":p_{$i}" => $link[$p],
            ],
        ];
    }
    $j = $original['depth'] + 1;
    while ($i <= static::BOOK_MAX_DEPTH && $j <= static::BOOK_MAX_DEPTH) {
        $expressions[] = [
            'p' . $i++,
            'p' . $j++,
            [],
        ];
    }
    while ($i <= static::BOOK_MAX_DEPTH) {
        $expressions[] = [
            'p' . $i++,
            0,
            [],
        ];
    }
    $shift = $link['depth'] - $original['depth'];
    if ($shift > 0) {
        // The order of expressions must be reversed so the new values don't
        // overwrite the old ones before they can be used because "Single-table
        // UPDATE assignments are generally evaluated from left to right".
        // @see http://dev.mysql.com/doc/refman/5.0/en/update.html
        $expressions = array_reverse($expressions);
    }
    $this->bookOutlineStorage
        ->updateMovedChildren($link['bid'], $original, $expressions, $shift);
}