views_plugin_argument_default_book_root.inc

<?php


/**
 * @file
 * Definition of views_plugin_argument_default_book_root.
 */

/**
 * Default argument plugin to get the current node's book root.
 */
class views_plugin_argument_default_book_root extends views_plugin_argument_default_node {
    
    /**
     * {@inheritdoc}
     */
    public function get_argument() {
        // Use the argument_default_node plugin to get the nid argument.
        $nid = parent::get_argument();
        if (!empty($nid)) {
            $node = node_load($nid);
            if (isset($node->book['bid'])) {
                return $node->book['bid'];
            }
        }
    }

}