public function autoload( $class ) {
		$class_parts = explode( '_', strtolower( $class ) );

		if ( 'bp' !== $class_parts[0] ) {
			return;
		}

		$components = array(
			'activity',
			'blogs',
			'core',
			'friends',
			'groups',
			'members',
			'messages',
			'notifications',
			'settings',
			'xprofile',
		);

		// These classes don't have a name that matches their component.
		$irregular_map = array(
			'BP_Akismet'                => 'activity',
			'BP_REST_Activity_Endpoint' => 'activity',

			'BP_Admin'                                   => 'core',
			'BP_Attachment_Avatar'                       => 'core',
			'BP_Attachment_Cover_Image'                  => 'core',
			'BP_Attachment'                              => 'core',
			'BP_Button'                                  => 'core',
			'BP_Component'                               => 'core',
			'BP_Customizer_Control_Range'                => 'core',
			'BP_Date_Query'                              => 'core',
			'BP_Email_Delivery'                          => 'core',
			'BP_Email_Address'                           => 'core',
			'BP_Email_Recipient'                         => 'core',
			'BP_Email_Sender'                            => 'core',
			'BP_Email_Participant'                       => 'core',
			'BP_Email'                                   => 'core',
			'BP_Embed'                                   => 'core',
			'BP_Media_Extractor'                         => 'core',
			'BP_Members_Suggestions'                     => 'core',
			'BP_PHPMailer'                               => 'core',
			'BP_Recursive_Query'                         => 'core',
			'BP_Suggestions'                             => 'core',
			'BP_Theme_Compat'                            => 'core',
			'BP_User_Query'                              => 'core',
			'BP_Walker_Category_Checklist'               => 'core',
			'BP_Walker_Nav_Menu_Checklist'               => 'core',
			'BP_Walker_Nav_Menu'                         => 'core',
			'BP_Invitation_Manager'                      => 'core',
			'BP_Invitation'                              => 'core',
			'BP_REST_Components_Endpoint'                => 'core',
			'BP_REST_Attachments'                        => 'core',
			'BP_REST_Attachments_Member_Avatar_Endpoint' => 'core',
			'BP_REST_Attachments_Group_Avatar_Endpoint'  => 'core',

			'BP_Core_Friends_Widget' => 'friends',

			'BP_Group_Extension'                        => 'groups',
			'BP_Group_Member_Query'                     => 'groups',
			'BP_REST_Groups_Endpoint'                   => 'groups',
			'BP_REST_Group_Membership_Endpoint'         => 'groups',
			'BP_REST_Group_Invites_Endpoint'            => 'groups',
			'BP_REST_Group_Membership_Request_Endpoint' => 'groups',

			'BP_Core_Members_Template'       => 'members',
			'BP_Core_Members_Widget'         => 'members',
			'BP_Core_Recently_Active_Widget' => 'members',
			'BP_Core_Whos_Online_Widget'     => 'members',
			'BP_Registration_Theme_Compat'   => 'members',
			'BP_Signup'                      => 'members',
			'BP_REST_Members_Endpoint'       => 'members',

			'BP_REST_Messages_Endpoint' => 'messages',

			'BP_REST_Notifications_Endpoint' => 'notifications',

			'BP_REST_XProfile_Fields_Endpoint'       => 'xprofile',
			'BP_REST_XProfile_Field_Groups_Endpoint' => 'xprofile',
			'BP_REST_XProfile_Data_Endpoint'         => 'xprofile',
		);

		$component = null;

		// First check to see if the class is one without a properly namespaced name.
		if ( isset( $irregular_map[ $class ] ) ) {
			$component = $irregular_map[ $class ];

		// Next chunk is usually the component name.
		} elseif ( in_array( $class_parts[1], $components, true ) ) {
			$component = $class_parts[1];
		}

		if ( ! $component ) {
			return;
		}

		// Sanitize class name.
		$class = strtolower( str_replace( '_', '-', $class ) );

		if ( 'bp-rest-attachments' === $class ) {
			$path = dirname( __FILE__ ) . "/bp-{$component}/classes/trait-attachments.php";
		} else {
			$path = dirname( __FILE__ ) . "/bp-{$component}/classes/class-{$class}.php";
		}

		// Sanity check.
		if ( ! file_exists( $path ) ) {
			return;
		}

		/*
		 * Sanity check 2 - Check if component is active before loading class.
		 * Skip if PHPUnit is running, or BuddyPress is installing for the first time.
		 */
		if (
			! in_array( $component, array( 'core', 'members' ), true ) &&
			! bp_is_active( $component ) &&
			! function_exists( 'tests_add_filter' )
		) {
			return;
		}

		require $path;
	}