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Support zip import of RDF data with title in dc:title element #110

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Support zip import of RDF data with title in dc:title element #110

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62 changes: 60 additions & 2 deletions modules/zip_importer/includes/importer.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -142,8 +142,8 @@ class ZipBatchImporter extends IslandoraBatchImporter {
$zip = new ZipArchive();
if (($error = $zip->open(drupal_realpath($file->uri))) !== TRUE) {
drupal_set_message(t('Error opening the provided Zip file. Code: %code', array(
'%code' => $error,
)));
'%code' => $error,
)));
return;
}

Expand Down Expand Up @@ -182,6 +182,7 @@ class ZipBatchImportObject extends IslandoraImportObject {
protected static $DC2MODS = '';
protected static $DWC2DC = '';
protected static $MADS2DC = '';
protected static $RDF2DC = '';
protected static $transformPath = '';

/**
Expand All @@ -208,6 +209,10 @@ class ZipBatchImportObject extends IslandoraImportObject {
if (self::$MADS2DC == '') {
self::$MADS2DC = self::$transformPath . "/mads_to_dc.xsl";
}

if (self::$RDF2DC == '') {
self::$RDF2DC = variable_get('zip_importer_path_rdf_to_dc', self::$transformPath . "/rdf_to_dc.xsl");
}
}
}

Expand Down Expand Up @@ -341,6 +346,13 @@ class ZipBatchImportObject extends IslandoraImportObject {
$mimetype = 'application/xml';
}

elseif ($this->isRDF($this->getXML())) {
// For RDF file, set datastream to RDF and skips the detection.
$do_determine_dsid_and_mimetype = FALSE;
$dsid = 'RDF';
$mimetype = 'application/rdf+xml';
}

else {
// XML streams are handled via the parent implementation,
// (via get_{mods,dc}()) so let's go to the next item.
Expand Down Expand Up @@ -399,6 +411,40 @@ class ZipBatchImportObject extends IslandoraImportObject {
return $to_return;
}

// Override parent getTitle().
public function getTitle() {

if ($this->title === NULL) {
// RDF
$xml = $this->getXML();
if ($this->isRDF($xml)) {
$rdf_doc = new DOMDocument();
$rdf_doc->loadXML($xml);
$xpath = new DOMXPath($rdf_doc);
$xpath->registerNamespace("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
$xpath->registerNamespace("dcterms", "http://purl.org/dc/terms/");
$xpath->registerNamespace("wgs84", "http://www.w3.org/2003/01/geo/wgs84_pos#");
$xpath->registerNamespace("schema", "http://schema.org");
$xpath->registerNamespace("dc", "http://purl.org/dc/elements/1.1/");

$this->title = $xpath->evaluate('string(//dc:title)');
}
else {
$mods = $this->getMODS();
if ($mods) {
$mods_doc = new DOMDocument();
$mods_doc->loadXML($mods);
$mods_xpath = new DOMXPath($mods_doc);
$mods_xpath->registerNamespace('m', 'http://www.loc.gov/mods/v3');

$this->title = $mods_xpath->evaluate('string(//m:mods/m:titleInfo/m:title/text())');
}
}
}

return $this->title;
}

/**
* Generates a MODS document repersenting the imported data.
*
Expand Down Expand Up @@ -470,6 +516,10 @@ EOXML;
elseif ($this->isMADS($xml)) {
$this->dc = static::runXSLTransform(array('input' => $xml, 'xsl' => self::$MADS2DC));
}
// Added by jh
elseif ($this->isRDF($xml)) {
$this->dc = static::runXSLTransform(array('input' => $xml, 'xsl' => self::$RDF2DC));
}
// Otherwise, call the parent implementation (transform from MODS).
if (empty($this->dc)) {
parent::getDC();
Expand Down Expand Up @@ -572,6 +622,14 @@ EOXML;
return $this->getLocalNameOfRootElement($xml) == 'dc';
}

/**
* Checks if the given file content is actually a RDF document.
*/
protected function isRDF($xml) {
$localNameOfRootElement = $this->getLocalNameOfRootElement($xml);
return strtolower($localNameOfRootElement) == 'rdf';
}

/**
* Checks if the given file content is actually a Darwin Core document.
*/
Expand Down