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<?php
namespace SMW\SPARQLStore;
use RuntimeException;
use SMW\DIWikiPage;
use SMW\InMemoryPoolCache;
use SMWExpNsResource as ExpNsResource;
use SMWExporter as Exporter;
use SMWExpResource as ExpResource;
use SMWTurtleSerializer as TurtleSerializer;
/**
* @license GNU GPL v2+
* @since 2.0
*
* @author Markus Krötzsch
* @author mwjames
*/
class RepositoryRedirectLookup {
/**
* ID used for the InMemoryPoolCache
*/
const POOLCACHE_ID = 'sparql.repository.redirectLookup';
/**
* @var RepositoryConnection
*/
private $repositoryConnection;
/**
* @since 2.0
*
* @param RepositoryConnection $repositoryConnection
*/
public function __construct( RepositoryConnection $repositoryConnection ) {
$this->repositoryConnection = $repositoryConnection;
}
/**
* @since 2.1
*/
public static function reset() {
InMemoryPoolCache::getInstance()->resetPoolCacheById( self::POOLCACHE_ID );
}
/**
* Find the redirect target of an ExpNsResource
*
* Returns an SMWExpNsResource object the input redirects to, the input
* itself if there is no redirect (or it cannot be used for making a resource
* with a prefix).
*
* @since 1.6
*
* @param ExpNsResource $expNsResource string URI to check
* @param boolean $existsthat is set to true if $expNsResource is in the
* store; always false for blank nodes; always true for subobjects
*
* @return ExpNsResource
* @throws RuntimeException
*/
public function findRedirectTargetResource( ExpNsResource $expNsResource, &$exists ) {
$exists = true;
if ( $expNsResource->isBlankNode() || $this->isNonRedirectableResource( $expNsResource ) ) {
$exists = false;
return $expNsResource;
}
if ( ( $expNsResource->getDataItem() instanceof DIWikiPage ) &&
$expNsResource->getDataItem()->getSubobjectName() !== '' ) {
return $expNsResource;
}
$firstRow = $this->doLookupResourceUriTargetFor( $expNsResource );
if ( $firstRow === false ) {
$exists = false;
return $expNsResource;
}
if ( is_array( $firstRow ) && count( $firstRow ) > 1 && !is_null( $firstRow[1] ) ) {
return $this->getResourceForTargetElement( $expNsResource, $firstRow[1] );
}
return $expNsResource;
}
private function doLookupResourceUriTargetFor( ExpNsResource $expNsResource ) {
$poolCache = InMemoryPoolCache::getInstance()->getPoolCacheById( self::POOLCACHE_ID );
if ( !$poolCache->contains( $expNsResource->getUri() ) ) {
$poolCache->save(
$expNsResource->getUri(),
$this->lookupResourceUriTargetFromDatabase( $expNsResource )
);
}
return $poolCache->fetch( $expNsResource->getUri() );
}
private function isNonRedirectableResource( ExpNsResource $expNsResource ) {
return $expNsResource->getNamespaceId() === 'swivt' ||
$expNsResource->getNamespaceId() === 'rdf' ||
$expNsResource->getNamespaceId() === 'rdfs' ||
( $expNsResource->getNamespaceId() === 'property' && strrpos( $expNsResource->getLocalName(), 'aux' ) ) ||
( isset( $expNsResource->isUserDefined ) && !$expNsResource->isUserDefined );
}
private function lookupResourceUriTargetFromDatabase( ExpNsResource $expNsResource ) {
$resourceUri = TurtleSerializer::getTurtleNameForExpElement( $expNsResource );
$rediUri = TurtleSerializer::getTurtleNameForExpElement( Exporter::getInstance()->getSpecialPropertyResource( '_REDI' ) );
$skeyUri = TurtleSerializer::getTurtleNameForExpElement( Exporter::getInstance()->getSpecialPropertyResource( '_SKEY' ) );
$respositoryResult = $this->repositoryConnection->select(
'*',
"$resourceUri $skeyUri ?s OPTIONAL { $resourceUri $rediUri ?r }",
[ 'LIMIT' => 1 ],
[ $expNsResource->getNamespaceId() => $expNsResource->getNamespace() ]
);
return $respositoryResult->current();
}
private function getResourceForTargetElement( ExpNsResource $expNsResource, $rediTargetElement ) {
if ( !$rediTargetElement instanceof ExpResource ) {
throw new RuntimeException( 'Expected a ExpResource instance' );
}
$rediTargetUri = $rediTargetElement->getUri();
$wikiNamespace = Exporter::getInstance()->getNamespaceUri( 'wiki' );
if ( strpos( $rediTargetUri, $wikiNamespace ) === 0 ) {
return new ExpNsResource( substr( $rediTargetUri, strlen( $wikiNamespace ) ), $wikiNamespace, 'wiki' );
}
return $expNsResource;
}
}
|
