Interface for different metadata providers.
OAI-PMH metadata can be generated in various ways. This interface provides a common API enabling the \acdhOeaw\oai\Oai class to handle metadata no matter how they are generated.
__construct(\acdhOeaw\fedora\FedoraResource $resource, \stdClass $sparqlResultRow, \acdhOeaw\oai\data\MetadataFormat $format)
Creates a metadata object for a given repository resource.
| \acdhOeaw\fedora\FedoraResource | $resource | repository resource object |
| \stdClass | $sparqlResultRow | SPARQL search query result row |
| \acdhOeaw\oai\data\MetadataFormat | $format | metadata format descriptor describing this resource |
extendSearchQuery(\acdhOeaw\oai\data\MetadataFormat $format, string $resVar)
Allows to extend a search query with additional clauses specific to the given metadata source.
Returned string must be a valid SPARQL query part one can insert as ...
in a query like SELECT * WHERE { ... LIMIT (someRule)}. It means if
you need your own LIMIT clause or other advanced constructs, you must
return a subquery.
Remark! PHP doesn't consider static methods as an interface part therefore existance of this method in classes implementing this interface is not enforced.
| \acdhOeaw\oai\data\MetadataFormat | $format | metadata format descriptor |
| string | $resVar | variable used in the search query to denote the repository resource |