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Revision 50928

Added by Alessia Bardi about 6 years ago

For almost every graph we used to return also "concept URLs" like "http://parthenos.d4science.org/handle/Parthenos/REG/Concept/datasettype/metadata"...let's try to avoid them skipping non URL resources and resources whose type is not in the parthenos namespace.

View differences:

VirtuosoReadAPI.java
6 6 

  		




  7
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import com.google.common.collect.Iterators;


  		




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import com.google.common.collect.Lists;


  		




  
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import eu.dnetlib.parthenos.CRMpe;


  		




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import org.apache.commons.logging.Log;


  		




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import org.apache.commons.logging.LogFactory;


  		




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import org.apache.jena.query.Query;


  		




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  62
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	@RequestMapping(value = "/virtuoso/subjects", produces = { "application/json" }, method = RequestMethod.GET)


  		




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	public List<String> getSubjectsForGraph(@RequestParam final String graph) {


  		




  65
  
  
    
		// To filter out all subjects that do not start with 'http' use the following query


  		




  66
  
  
    
		// String queryForSubjectsTemplate = "SELECT DISTINCT ?s WHERE {GRAPH <%s> {?s ?p ?o . FILTER regex(str(?s),'^http')}}";


  		




  67
  
  
    
		// Based on FORTH observation, those without a URL should not be interesting by themselves, but looking at Nakala data it seems this is not the case:


  		




  68
  
  
    
		String queryForSubjectsTemplate = "SELECT DISTINCT ?s WHERE {GRAPH <%s> {?s ?p ?o }}";


  		




  69
  
  
    
		String q = String.format(queryForSubjectsTemplate, graph);


  		




  
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		// Based on FORTH observation, resources without a URL should not be interesting by themselves.


  		




  
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		// Here we filter out those + resources whose type is not in the parthenos namespace.


  		




  
  68
  
    

  		




  
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		//old query selecting any subjects in the given graph


  		




  
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		//String queryForSubjectsTemplate = "SELECT DISTINCT ?s WHERE {GRAPH <%s> {?s ?p ?o .}}";


  		




  
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		String queryForSubjectsTemplate = "SELECT DISTINCT ?s WHERE {GRAPH <%s> {?s ?p ?o . ?s a ?t. FILTER (isURI(?s) && STRSTARTS(str(?t), str('%s'))) }}";


  		




  
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		String q = String.format(queryForSubjectsTemplate, graph, CRMpe.NS);


  		




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		log.debug(q);


  		




  
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		final QueryEngineHTTP serviceRequest =


  		




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				QueryExecutionFactory.createServiceRequest(sparqlUrl, QueryFactory.create(q));


  		




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		ResultSet subjects = serviceRequest.execSelect();


  		












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