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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: $Id$
* @link http://pear.php.net/package/File_MARC
*/
// {{{ class File_MARC_Field extends Structures_LinkedList_DoubleNode
/**
* The File_MARC_Field class is expected to be extended to reflect the
* requirements of control and data fields.
*
* Every MARC field contains a tag name.
*
* @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_Field extends Structures_LinkedList_DoubleNode
{
// {{{ properties
/**
* The tag name of the Field
* @var string
*/
protected $tag;
// }}}
// {{{ Constructor: function __construct()
/**
* File_MARC_Field constructor
*
* Create a new {@link File_MARC_Field} object from passed arguments. We
* define placeholders for the arguments required by child classes.
*
* @param string $tag tag
* @param string $subfields placeholder for subfields or control data
* @param string $ind1 placeholder for first indicator
* @param string $ind2 placeholder for second indicator
*/
function __construct($tag, $subfields = null, $ind1 = null, $ind2 = null)
{
$this->tag = $tag;
// Check if valid tag
if (!preg_match("/^[0-9A-Za-z]{3}$/", $tag)) {
$errorMessage = File_MARC_Exception::formatError(File_MARC_Exception::$messages[File_MARC_Exception::ERROR_INVALID_TAG], array("tag" => $tag));
throw new File_MARC_Exception($errorMessage, File_MARC_Exception::ERROR_INVALID_TAG);
}
}
// }}}
// {{{ Destructor: function __destruct()
/**
* Destroys the data field
*/
function __destruct()
{
$this->tag = null;
parent::__destruct();
}
// }}}
// {{{ getTag()
/**
* Returns the tag for this {@link File_MARC_Field} object
*
* @return string returns the tag number of the field
*/
function getTag()
{
return (string)$this->tag;
}
// }}}
// {{{ setTag()
/**
* Sets the tag for this {@link File_MARC_Field} object
*
* @param string $tag new value for the tag
*
* @return string returns the tag number of the field
*/
function setTag($tag)
{
$this->tag = $tag;
return $this->getTag();
}
// }}}
// {{{ isEmpty()
/**
* Is empty
*
* Checks if the field is empty.
*
* @return bool Returns true if the field is empty, otherwise false
*/
function isEmpty()
{
if ($this->getTag()) {
return false;
}
// It is empty
return true;
}
// }}}
// {{{ isControlField()
/**
* Is control field
*
* Checks if the field is a control field.
*
* @return bool Returns true if the field is a control field, otherwise false
*/
function isControlField()
{
if (get_class($this) == 'File_MARC_Control_Field') {
return true;
}
return false;
}
// }}}
// {{{ isDataField()
/**
* Is data field
*
* Checks if the field is a data field.
*
* @return bool Returns true if the field is a data field, otherwise false
*/
function isDataField()
{
if (get_class($this) == 'File_MARC_Data_Field') {
return true;
}
return false;
}
// }}}
/**
* ========== OUTPUT METHODS ==========
*/
// {{{ __toString()
/**
* Return Field formatted
*
* Return Field as a formatted string.
*
* @return string Formatted output of Field
*/
function __toString()
{
return (string)$this->getTag();
}
// }}}
// {{{ toRaw()
/**
* Return field in raw MARC format (stub)
*
* Return the field formatted in raw MARC for saving into MARC files. This
* stub method is extended by the child classes.
*
* @return bool Raw MARC
*/
function toRaw()
{
return false;
}
// }}}
// {{{ formatField()
/**
* Pretty print a MARC_Field object without tags, indicators, etc.
*
* @param array $exclude Subfields to exclude from formatted output
*
* @return string Returns the formatted field data
*/
function formatField($exclude = array('2'))
{
if ($this->isControlField()) {
return $this->getData();
} else {
$out = '';
foreach ($this->getSubfields() as $subfield) {
if (substr($this->getTag(), 0, 1) == '6' and (in_array($subfield->getCode(), array('v','x','y','z')))) {
$out .= ' -- ' . $subfield->getData();
} elseif (!in_array($subfield->getCode(), $exclude)) {
$out .= ' ' . $subfield->getData();
}
}
return trim($out);
}
}
// }}}
}
// }}}
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