BuddyPress.org

BP XProfile Number Field

how can i write an action to hook into this field so that its limited by an integer (of say 20) and non-negative?

/**
 * Number xprofile field type.
 *
 * @since BuddyPress (2.0.0)
 */
class BP_XProfile_Field_Type_Number extends BP_XProfile_Field_Type {

	/**
	 * Constructor for the number field type
	 *
	 * @since BuddyPress (2.0.0)
 	 */
	public function __construct() {
		parent::__construct();

		$this->category = _x( 'Single Fields', 'xprofile field type category', 'buddypress' );
		$this->name     = _x( 'Number', 'xprofile field type', 'buddypress' );

		$this->set_format( '/^\d+|-\d+$/', 'replace' );
		do_action( 'bp_xprofile_field_type_number', $this );
	}

function bp_xprofile_get_field_types() {
	$fields = array(
		'checkbox'       => 'BP_XProfile_Field_Type_Checkbox',
		'datebox'        => 'BP_XProfile_Field_Type_Datebox',
		'multiselectbox' => 'BP_XProfile_Field_Type_Multiselectbox',
		'number'         => 'BP_XProfile_Field_Type_Number',
		'url'            => 'BP_XProfile_Field_Type_URL',
		'radio'          => 'BP_XProfile_Field_Type_Radiobutton',
		'selectbox'      => 'BP_XProfile_Field_Type_Selectbox',
		'textarea'       => 'BP_XProfile_Field_Type_Textarea',
		'textbox'        => 'BP_XProfile_Field_Type_Textbox',
	);