Drupal modules for browsing and managing Fedora-based digital repositories.
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<?php
// $Id$
/**
* @file
* Implements a simple class for working with Dublin Core data and exporting it
* back to XML. Inspiration and design shamelessly stolen from the pyfedora
* project at http://pypi.python.org/pypi/pyfedora/0.1.0
*/
/**
* Dublin Core Class
*/
class Dublin_Core {
public $dc = array(
'dc:title' => array(),
'dc:creator' => array(),
'dc:subject' => array(),
'dc:description' => array(),
'dc:publisher' => array(),
'dc:contributor' => array(),
'dc:date' => array(),
'dc:type' => array(),
'dc:format' => array(),
'dc:identifier' => array(),
'dc:source' => array(),
'dc:language' => array(),
'dc:relation' => array(),
'dc:coverage' => array(),
'dc:rights' => array(),
);
public $owner;
/**
* Constructs a Dublin_Core object from a Fedora_Item object and populates
* the $dc array.
* @param <type> $item
*/
function Dublin_Core($item = NULL) {
if (!empty($item)) {
$this->owner = $item;
$dc_xml = $item->get_datastream_dissemination('DC');
$this->dc = self::import_from_xml_string($dc_xml)->dc;
}
}
/**
* Add Elements
* @param <type> $element_name
* @param <type> $value
*/
function add_element($element_name, $value) {
if (is_string($value) && is_array($this->dc[$element_name])) {
$this->dc[$element_name][] = $value;
}
}
/**
* Replace the given DC element with the values in $values
* @param string $elemnt_name
* @param array $values
*/
function set_element($element_name, $values) {
if (is_array($values)) {
$this->dc[$element_name] = $values;
}
elseif (is_string($values)) {
$this->dc[$element_name] = array($values);
}
}
/**
* Serialize this object to XML and return it.
* @param type $with_preamble
* @return type
*/
function as_xml($with_preamble = FALSE) {
$dc_xml = new DomDocument();
$oai_dc = $dc_xml->createElementNS('http://www.openarchives.org/OAI/2.0/oai_dc/', 'oai_dc:dc');
$oai_dc->setAttribute('xmlns:dc', 'http://purl.org/dc/elements/1.1/');
foreach ($this->dc as $dc_element => $values) {
if (is_array($values) && !empty($values)) {
foreach ($values as $value) {
$new_item = $dc_xml->createElement($dc_element, $value);
$oai_dc->appendChild($new_item);
}
}
else {
$new_item = $dc_xml->createElement($dc_element);
$oai_dc->appendChild($new_item);
}
}
$dc_xml->appendChild($oai_dc);
return $dc_xml->saveXML();
}
/**
* Create dc from dict ( does nothing )
*/
static function create_dc_from_dict() {
}
/**
* Save ??
* @param type $alt_owner
*/
function save($alt_owner = NULL) {
$item_to_update = (!empty($alt_owner) ? $alt_owner : $this->owner);
// My Java roots showing, trying to do polymorphism in PHP.
if (!empty($item_to_update)) {
$item_to_update->modify_datastream_by_value($this->as_xml(), 'DC', 'Default Dublin Core Metadata', 'text/xml');
}
}
/**
* Creates a new instance of the class by parsing dc_xml
* @param string $dc_xml
* @return Dublin_Core
*/
static function import_from_xml_string($dc_xml) {
$dc_doc = new DomDocument();
if ($dc_doc->loadXML($dc_xml)) {
$oai_dc = $dc_doc->getElementsByTagNameNS('http://purl.org/dc/elements/1.1/', '*');
$new_dc = new Dublin_Core();
foreach ($oai_dc as $child) {
array_push($new_dc->dc[$child->nodeName], $child->nodeValue);
}
return $new_dc;
}
else {
return NULL;
}
}
}