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156 | <?php
/**
* @defgroup citation_lookup_crossref
*/
/**
* @file classes/citation/lookup/crossref/CrossrefNlmCitationSchemaFilter.inc.php
*
* Copyright (c) 2000-2012 John Willinsky
* Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
*
* @class CrossrefNlmCitationSchemaFilter
* @ingroup citation_lookup_crossref
*
* @brief Filter that uses the Crossref web
* service to identify a DOI and corresponding
* meta-data for a given NLM citation.
*/
// $Id$
import('citation.NlmCitationSchemaFilter');
define('CROSSREF_WEBSERVICE_URL', 'http://www.crossref.org/openurl/');
class CrossrefNlmCitationSchemaFilter extends NlmCitationSchemaFilter {
/** @var string CrossRef registered access email */
var $_email = '';
/*
* Constructor
* @param $email string
*/
function CrossrefNlmCitationSchemaFilter($email) {
assert(!empty($email));
$this->_email = $email;
parent::NlmCitationSchemaFilter(
array(
NLM_PUBLICATION_TYPE_JOURNAL,
NLM_PUBLICATION_TYPE_CONFPROC,
NLM_PUBLICATION_TYPE_BOOK,
NLM_PUBLICATION_TYPE_THESIS
)
);
}
//
// Getters and Setters
//
/**
* Get the access email
* @return string
*/
function getEmail() {
return $this->_email;
}
//
// Implement template methods from Filter
//
/**
* @see Filter::process()
* @param $citationDescription MetadataDescription
* @return MetadataDescription
*/
function &process(&$citationDescription) {
$nullVar = null;
$searchParams = array(
'pid' => $this->getEmail(),
'noredirect' => 'true',
'format' => 'unixref'
);
$doi = $citationDescription->getStatement('pub-id[@pub-id-type="doi"]');
if (!empty($doi)) {
// Directly look up the DOI with OpenURL 0.1
$searchParams['id'] = 'doi:'.$doi;
} else {
// Use OpenURL meta-data to search for the entry
if (is_null($openUrlMetadata = $this->_prepareOpenUrlSearch($citationDescription))) return $nullVar;
$searchParams += $openUrlMetadata;
}
// Call the CrossRef web service
if (is_null($resultXml =& $this->callWebService(CROSSREF_WEBSERVICE_URL, $searchParams, XSL_TRANSFORMER_DOCTYPE_STRING))) return $nullVar;
// Remove default name spaces from XML as CrossRef doesn't
// set them reliably and element names are unique anyway.
$resultXml = String::regexp_replace('/ xmlns="[^"]+"/', '', $resultXml);
// Transform and process the web service result
if (is_null($metadata =& $this->transformWebServiceResults($resultXml, dirname(__FILE__).DIRECTORY_SEPARATOR.'crossref.xsl'))) return $nullVar;
return $this->addMetadataArrayToNlmCitationDescription($metadata, $citationDescription);
}
//
// Private methods
//
/**
* Prepare a search with the CrossRef OpenURL resolver
* @param $citationDescription MetadataDescription
* @return array an array of search parameters
*/
function &_prepareOpenUrlSearch(&$citationDescription) {
$nullVar = null;
// Crosswalk to OpenURL
import('metadata.nlm.NlmCitationSchemaOpenUrlCrosswalkFilter');
$nlmOpenUrlFilter = new NlmCitationSchemaOpenUrlCrosswalkFilter();
if (is_null($openUrlCitation =& $nlmOpenUrlFilter->execute($citationDescription))) return $nullVar;
// Prepare the search
$searchParams = array(
'url_ver' => 'Z39.88-2004'
);
// Configure the meta-data schema
$openUrlCitationSchema =& $openUrlCitation->getMetadataSchema();
switch(true) {
case is_a($openUrlCitationSchema, 'OpenUrlJournalSchema'):
$searchParams['rft_val_fmt'] = 'info:ofi/fmt:kev:mtx:journal';
break;
case is_a($openUrlCitationSchema, 'OpenUrlBookSchema'):
$searchParams['rft_val_fmt'] = 'info:ofi/fmt:kev:mtx:book';
break;
case is_a($openUrlCitationSchema, 'OpenUrlDissertationSchema'):
$searchParams['rft_val_fmt'] = 'info:ofi/fmt:kev:mtx:dissertation';
break;
default:
assert(false);
}
// Add all OpenURL meta-data to the search parameters
// FIXME: Implement a looping search like for other lookup services.
$searchProperties = array(
'aufirst', 'aulast', 'btitle', 'jtitle', 'atitle', 'issn',
'artnum', 'date', 'volume', 'issue', 'spage', 'epage'
);
foreach ($searchProperties as $property) {
if ($openUrlCitation->hasStatement($property)) {
$searchParams['rft.'.$property] = $openUrlCitation->getStatement($property);
}
}
return $searchParams;
}
}
?>
|
ocs /lib/pkp/classes/citation/lookup/crossref/CrossrefNlmCitationSchemaFilter.inc.php