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<?php
/* vim: set expandtab shiftwidth=4 tabstop=4 softtabstop=4 foldmethod=marker: */
/**
* Parser for MARC records
*
* This package is based on the PHP MARC package, originally called "php-marc",
* that is part of the Emilda Project (http://www.emilda.org). Christoffer
* Landtman generously agreed to make the "php-marc" code available under the
* GNU LGPL so it could be used as the basis of this PEAR package.
*
* PHP version 5
*
* LICENSE: This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @category File_Formats
* @package File_MARC
* @author Christoffer Landtman <landtman@realnode.com>
* @author Dan Scott <dscott@laurentian.ca>
* @copyright 2003-2008 Oy Realnode Ab, Dan Scott
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version CVS: $Id: Subfield.php 301737 2010-07-31 04:14:44Z dbs $
* @link http://pear.php.net/package/File_MARC
*/
// {{{ class File_MARC_Subfield extends Structures_LinkedList_DoubleNode
/**
* The File_MARC_Subfield class represents a single subfield in a MARC
* record field.
*
* Represents a subfield within a MARC field and implements all management
* functions related to a single subfield. This class also implements
* the possibility of duplicate subfields within a single field, for example
* 650 _z Test1 _z Test2.
*
* @category File_Formats
* @package File_MARC
* @author Christoffer Landtman <landtman@realnode.com>
* @author Dan Scott <dscott@laurentian.ca>
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @link http://pear.php.net/package/File_MARC
*/
class File_MARC_Subfield extends Structures_LinkedList_DoubleNode
{
// {{{ properties
/**
* Subfield code, e.g. _a, _b
* @var string
*/
protected $code;
/**
* Data contained by the subfield
* @var string
*/
protected $data;
// }}}
// {{{ Constructor: function __construct()
/**
* File_MARC_Subfield constructor
*
* Create a new subfield to represent the code and data
*
* @param string $code Subfield code
* @param string $data Subfield data
*/
function __construct($code, $data)
{
$this->code = $code;
$this->data = $data;
}
// }}}
// {{{ Destructor: function __destruct()
/**
* Destroys the subfield
*/
function __destruct()
{
$this->code = null;
$this->data = null;
parent::__destruct();
}
// }}}
// {{{ Explicit destructor: function delete()
/**
* Destroys the subfield
*
* @return true
*/
function delete()
{
$this->__destruct();
}
// }}}
// {{{ getCode()
/**
* Return code of the subfield
*
* @return string Tag name
*/
function getCode()
{
return (string)$this->code;
}
// }}}
// {{{ getData()
/**
* Return data of the subfield
*
* @return string data
*/
function getData()
{
return (string)$this->data;
}
// }}}
// {{{ __toString()
/**
* Return string representation of subfield
*
* @return string String representation
*/
public function __toString()
{
$pretty = '[' . $this->getCode() . ']: ' . $this->getData();
return $pretty;
}
// }}}
// {{{ toRaw()
/**
* Return the USMARC representation of the subfield
*
* @return string USMARC representation
*/
function toRaw()
{
$result = File_MARC::SUBFIELD_INDICATOR.$this->code.$this->data;
return (string)$result;
}
// }}}
// {{{ setCode()
/**
* Sets code of the subfield
*
* @param string $code new code for the subfield
*
* @return string code
*/
function setCode($code)
{
if ($code) {
// could check more stringently; m/[a-Z]/ or the likes
$this->code = $code;
} else {
// code must be _something_; raise error
return false;
}
return true;
}
// }}}
// {{{ setData()
/**
* Sets data of the subfield
*
* @param string $data new data for the subfield
*
* @return string data
*/
function setData($data)
{
$this->data = $data;
return true;
}
// }}}
// {{{ isEmpty()
/**
* Checks whether the subfield is empty or not
*
* @return bool True or false
*/
function isEmpty()
{
// There is data
if ($this->data) {
return false;
}
// There is no data
return true;
}
// }}}
}
// }}}
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