function outputMemory($flush = false, $force = false)
{
$out = parent::outputMemory($flush);
if ($this->first_time || $force) {
return $out;
}
return '';
}
/**
* Read a record from the database
*
* @param $id document identifier
* @param $prefix optional: OAI identifier prefix
* @param $header_only optional: just return header
* @param $dbrow optional: use cached database row, disclaim db request
* @return myxmlwriter record as XML data
*/
function record_helper($id, $prefix = 'oas', $header_only = false, $dbrow = false)
{
global $config;
// read record
if ($dbrow == false) {
if (!preg_match('/.*:([^:]+).([0-9]+)/', $id, $match)) {
return false;
}
$stmt = $this->dbc->prepare('SELECT * FROM ' . $config['db_table'] . ' WHERE identifier=? AND line=?');
if (!$stmt->execute(array($match[1], $match[2]))) {
return false;
}
if (!($data = $stmt->fetch())) {
return false;
}
} else {
$data = $dbrow;
}
// Is XML Wellformed? This is the only part where the simplexml extension is needed.
if (!$this->isXML_Wellformed($data['data'])) {
$this->_OAI20Error('badRecordXML', $config['oai_identifier_prefix'] . ':' . $data['identifier'] . '.' . $data['line'] . ' with datestamp ' . $data['timestamp'] . ' is not wellformed: ' . $this->getXML_LastErrMsg() . '. (Maybe a database BLOB overflow?)');
return new MyXmlWriter();
}
//Create
$header = new MyXmlWriter();
$header->openMemory();
$header->startElementNS(NULL, 'header', OAI20);
$header->writeElementNS(NULL, 'identifier', OAI20, $config['oai_identifier_prefix'] . ':' . $data['identifier'] . '.' . $data['line']);
$header->writeElementNS(NULL, 'datestamp', OAI20, gmdate('Y-m-d\\TH:i:s\\Z', $data['timestamp']));
$header->endElement();
//header
if ($header_only) {
return $header;
}
// asked for record header only
$rec = new MyXmlWriter();
$rec->openMemory();
$rec->startElementNS(NULL, 'record', OAI20);
$rec->appendXML($header);
$rec->startElementNS(NULL, 'metadata', OAI20);
if ($prefix == 'oai_dc') {
//THIS PART NEEDS REVIEW!
$rec->startElementNS(NULL, 'oai_dc', OAIDC);
$rec->writeAttributeNS('xmlns', 'dc', NULL, OAIDC_ELEMENTS);
$rec->writeAttributeNS('xmlns', 'xsi', NULL, XML_SCHEMA_INSTANCE);
$rec->writeAttributeNS('xsi', 'schemaLocation', NULL, OAIDC . ' ' . OAIDC_XSD);
$rec->writeElementNS('dc', 'description', OAIDC_ELEMENTS, 'Logdaten Server webdoc.sub.gwdg.de');
$rec->writeElementNS('dc', 'identifier', OAIDC_ELEMENTS, 'http://oa-statistik.sub.uni-goettingen.de/ns/logs/webdoc/?id=' . urlencode($id));
$rec->endElement();
//oai_dc
} else {
$rec->appendRawXML($data['data']);
}
$rec->endElement();
//metadata
$rec->endElement();
//record
return $rec;
}
