menu property.' );
				return array(); // Sorry, folks.
		}
	}
	/**
	 * @access public
	 */
	public function initialize() {
		$this->user = new stdClass;
		if ( is_user_logged_in() ) {
			/* Populate settings we need for the menu based on the current user. */
			$this->user->blogs = get_blogs_of_user( get_current_user_id() );
			if ( is_multisite() ) {
				$this->user->active_blog = get_active_blog_for_user( get_current_user_id() );
				$this->user->domain = empty( $this->user->active_blog ) ? user_admin_url() : trailingslashit( get_home_url( $this->user->active_blog->blog_id ) );
				$this->user->account_domain = $this->user->domain;
			} else {
				$this->user->active_blog = $this->user->blogs[get_current_blog_id()];
				$this->user->domain = trailingslashit( home_url() );
				$this->user->account_domain = $this->user->domain;
			}
		}
		add_action( 'wp_head', 'wp_admin_bar_header' );
		add_action( 'admin_head', 'wp_admin_bar_header' );
		if ( current_theme_supports( 'admin-bar' ) ) {
			/**
			 * To remove the default padding styles from WordPress for the Toolbar, use the following code:
			 * add_theme_support( 'admin-bar', array( 'callback' => '__return_false' ) );
			 */
			$admin_bar_args = get_theme_support( 'admin-bar' );
			$header_callback = $admin_bar_args[0]['callback'];
		}
		if ( empty($header_callback) )
			$header_callback = '_admin_bar_bump_cb';
		add_action('wp_head', $header_callback);
		wp_enqueue_script( 'admin-bar' );
		wp_enqueue_style( 'admin-bar' );
		/**
		 * Fires after WP_Admin_Bar is initialized.
		 *
		 * @since 3.1.0
		 */
		do_action( 'admin_bar_init' );
	}
	/**
	 * @param array $node
	 */
	public function add_menu( $node ) {
		$this->add_node( $node );
	}
	/**
	 * @param string $id
	 */
	public function remove_menu( $id ) {
		$this->remove_node( $id );
	}
	/**
	 * Add a node to the menu.
	 *
	 * @param array $args {
	 *     Arguments for adding a node.
	 *
	 *     @type string $id     ID of the item.
	 *     @type string $title  Title of the node.
	 *     @type string $parent Optional. ID of the parent node.
	 *     @type string $href   Optional. Link for the item.
	 *     @type bool   $group  Optional. Whether or not the node is a group. Default false.
	 *     @type array  $meta   Meta data including the following keys: 'html', 'class', 'rel',
	 *                          'onclick', 'target', 'title', 'tabindex'. Default empty.
	 * }
	 */
	public function add_node( $args ) {
		// Shim for old method signature: add_node( $parent_id, $menu_obj, $args )
		if ( func_num_args() >= 3 && is_string( func_get_arg(0) ) )
			$args = array_merge( array( 'parent' => func_get_arg(0) ), func_get_arg(2) );
		if ( is_object( $args ) )
			$args = get_object_vars( $args );
		// Ensure we have a valid title.
		if ( empty( $args['id'] ) ) {
			if ( empty( $args['title'] ) )
				return;
			_doing_it_wrong( __METHOD__, __( 'The menu ID should not be empty.' ), '3.3' );
			// Deprecated: Generate an ID from the title.
			$args['id'] = esc_attr( sanitize_title( trim( $args['title'] ) ) );
		}
		$defaults = array(
			'id'     => false,
			'title'  => false,
			'parent' => false,
			'href'   => false,
			'group'  => false,
			'meta'   => array(),
		);
		// If the node already exists, keep any data that isn't provided.
		if ( $maybe_defaults = $this->get_node( $args['id'] ) )
			$defaults = get_object_vars( $maybe_defaults );
		// Do the same for 'meta' items.
		if ( ! empty( $defaults['meta'] ) && ! empty( $args['meta'] ) )
			$args['meta'] = wp_parse_args( $args['meta'], $defaults['meta'] );
		$args = wp_parse_args( $args, $defaults );
		$back_compat_parents = array(
			'my-account-with-avatar' => array( 'my-account', '3.3' ),
			'my-blogs'               => array( 'my-sites',   '3.3' ),
		);
		if ( isset( $back_compat_parents[ $args['parent'] ] ) ) {
			list( $new_parent, $version ) = $back_compat_parents[ $args['parent'] ];
			_deprecated_argument( __METHOD__, $version, sprintf( 'Use %s as the parent for the %s admin bar node instead of %s.', $new_parent, $args['id'], $args['parent'] ) );
			$args['parent'] = $new_parent;
		}
		$this->_set_node( $args );
	}
	/**
	 * @param array $args
	 */
	final protected function _set_node( $args ) {
		$this->nodes[ $args['id'] ] = (object) $args;
	}
	/**
	 * Gets a node.
	 *
	 * @param string $id
	 * @return object Node.
	 */
	final public function get_node( $id ) {
		if ( $node = $this->_get_node( $id ) )
			return clone $node;
	}
	/**
	 * @param string $id
	 * @return object|void
	 */
	final protected function _get_node( $id ) {
		if ( $this->bound )
			return;
		if ( empty( $id ) )
			$id = 'root';
		if ( isset( $this->nodes[ $id ] ) )
			return $this->nodes[ $id ];
	}
	/**
	 * @return array|void
	 */
	final public function get_nodes() {
		if ( ! $nodes = $this->_get_nodes() )
			return;
		foreach ( $nodes as &$node ) {
			$node = clone $node;
		}
		return $nodes;
	}
	/**
	 * @return array|void
	 */
	final protected function _get_nodes() {
		if ( $this->bound )
			return;
		return $this->nodes;
	}
	/**
	 * Add a group to a menu node.
	 *
	 * @since 3.3.0
	 *
	 * @param array $args {
	 *     Array of arguments for adding a group.
	 *
	 *     @type string $id     ID of the item.
	 *     @type string $parent Optional. ID of the parent node. Default 'root'.
	 *     @type array  $meta   Meta data for the group including the following keys:
	 *                         'class', 'onclick', 'target', and 'title'.
	 * }
	 */
	final public function add_group( $args ) {
		$args['group'] = true;
		$this->add_node( $args );
	}
	/**
	 * Remove a node.
	 *
	 * @param string $id The ID of the item.
	 */
	public function remove_node( $id ) {
		$this->_unset_node( $id );
	}
	/**
	 * @param string $id
	 */
	final protected function _unset_node( $id ) {
		unset( $this->nodes[ $id ] );
	}
	/**
	 * @access public
	 */
	public function render() {
		$root = $this->_bind();
		if ( $root )
			$this->_render( $root );
	}
	/**
	 * @return object|void
	 */
	final protected function _bind() {
		if ( $this->bound )
			return;
		// Add the root node.
		// Clear it first, just in case. Don't mess with The Root.
		$this->remove_node( 'root' );
		$this->add_node( array(
			'id'    => 'root',
			'group' => false,
		) );
		// Normalize nodes: define internal 'children' and 'type' properties.
		foreach ( $this->_get_nodes() as $node ) {
			$node->children = array();
			$node->type = ( $node->group ) ? 'group' : 'item';
			unset( $node->group );
			// The Root wants your orphans. No lonely items allowed.
			if ( ! $node->parent )
				$node->parent = 'root';
		}
		foreach ( $this->_get_nodes() as $node ) {
			if ( 'root' == $node->id )
				continue;
			// Fetch the parent node. If it isn't registered, ignore the node.
			if ( ! $parent = $this->_get_node( $node->parent ) ) {
				continue;
			}
			// Generate the group class (we distinguish between top level and other level groups).
			$group_class = ( $node->parent == 'root' ) ? 'ab-top-menu' : 'ab-submenu';
			if ( $node->type == 'group' ) {
				if ( empty( $node->meta['class'] ) )
					$node->meta['class'] = $group_class;
				else
					$node->meta['class'] .= ' ' . $group_class;
			}
			// Items in items aren't allowed. Wrap nested items in 'default' groups.
			if ( $parent->type == 'item' && $node->type == 'item' ) {
				$default_id = $parent->id . '-default';
				$default    = $this->_get_node( $default_id );
				// The default group is added here to allow groups that are
				// added before standard menu items to render first.
				if ( ! $default ) {
					// Use _set_node because add_node can be overloaded.
					// Make sure to specify default settings for all properties.
					$this->_set_node( array(
						'id'        => $default_id,
						'parent'    => $parent->id,
						'type'      => 'group',
						'children'  => array(),
						'meta'      => array(
							'class'     => $group_class,
						),
						'title'     => false,
						'href'      => false,
					) );
					$default = $this->_get_node( $default_id );
					$parent->children[] = $default;
				}
				$parent = $default;
			// Groups in groups aren't allowed. Add a special 'container' node.
			// The container will invisibly wrap both groups.
			} elseif ( $parent->type == 'group' && $node->type == 'group' ) {
				$container_id = $parent->id . '-container';
				$container    = $this->_get_node( $container_id );
				// We need to create a container for this group, life is sad.
				if ( ! $container ) {
					// Use _set_node because add_node can be overloaded.
					// Make sure to specify default settings for all properties.
					$this->_set_node( array(
						'id'       => $container_id,
						'type'     => 'container',
						'children' => array( $parent ),
						'parent'   => false,
						'title'    => false,
						'href'     => false,
						'meta'     => array(),
					) );
					$container = $this->_get_node( $container_id );
					// Link the container node if a grandparent node exists.
					$grandparent = $this->_get_node( $parent->parent );
					if ( $grandparent ) {
						$container->parent = $grandparent->id;
						$index = array_search( $parent, $grandparent->children, true );
						if ( $index === false )
							$grandparent->children[] = $container;
						else
							array_splice( $grandparent->children, $index, 1, array( $container ) );
					}
					$parent->parent = $container->id;
				}
				$parent = $container;
			}
			// Update the parent ID (it might have changed).
			$node->parent = $parent->id;
			// Add the node to the tree.
			$parent->children[] = $node;
		}
		$root = $this->_get_node( 'root' );
		$this->bound = true;
		return $root;
	}
	/**
	 *
	 * @global bool $is_IE
	 * @param object $root
	 */
	final protected function _render( $root ) {
		global $is_IE;
		// Add browser classes.
		// We have to do this here since admin bar shows on the front end.
		$class = 'nojq nojs';
		if ( $is_IE ) {
			if ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE 7' ) )
				$class .= ' ie7';
			elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE 8' ) )
				$class .= ' ie8';
			elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE 9' ) )
				$class .= ' ie9';
		} elseif ( wp_is_mobile() ) {
			$class .= ' mobile';
		}
		?>