Group identification registration frame enables grouping of * otherwise unrelated frames. This can be used when some frames are to be * signed. To identify which frames belongs to a set of frames a group * identifier must be registered in the tag with this frame. * * The owner identifier is a URL containing an email address, or a link to a * location where an email address can be found, that belongs to the * organisation responsible for this grouping. Questions regarding the grouping * should be sent to the indicated email address. * * The group symbol contains a value that associates the frame with this group * throughout the whole tag, in the range $80-F0. All other values are reserved. * The group symbol may optionally be followed by some group specific data, e.g. * a digital signature. There may be several "GRID" frames in a tag but only one * containing the same symbol and only one containing the same owner identifier. * The group symbol must be used somewhere in the tag. See * {@link ID3_Frame#GROUPING_IDENTITY} for more information. * * @package php-reader * @subpackage ID3 * @author Sven Vollbehr * @copyright Copyright (c) 2008 The PHP Reader Project Workgroup * @license http://code.google.com/p/php-reader/wiki/License New BSD License * @version $Rev$ */ final class ID3_Frame_GRID extends ID3_Frame { /** @var string */ private $_id; /** @var integer */ private $_group; /** * Constructs the class with given parameters and parses object related data. * * @param Reader $reader The reader object. */ public function __construct($reader) { parent::__construct($reader); list($this->_id, $this->_data) = preg_split("/\\x00/", $this->_data, 2); $this->_group = substr($this->_data, 0, 1); $this->_data = substr($this->_data, 1); } /** * Returns the owner identifier string. * * @return string */ public function getIdentifier() { return $this->_id; } /** * Returns the group symbol. * * @return integer */ public function getGroup() { return $this->_group; } /** * Returns the group dependent data. * * @return string */ public function getData() { return $this->_data; } }