backend: support external SPARQL and named-graph snapshots

backend_go/graph_queries/default.go

@@ -1,6 +1,10 @@
 package graph_queries
 
-import "fmt"
+import (
+	"fmt"
+
+	"visualizador_instanciados/backend_go/queryscope"
+)
 
 func defaultEdgeQuery(limit int, offset int, includeBNodes bool) string {
 	bnodeFilter := ""
@@ -8,30 +12,33 @@ func defaultEdgeQuery(limit int, offset int, includeBNodes bool) string {
 		bnodeFilter = "FILTER(!isBlank(?s) && !isBlank(?o))"
 	}
 
+	pattern := queryscope.NamedGraph(`
+{
+  VALUES ?p { rdf:type }
+  ?s ?p ?o .
+}
+UNION
+{
+  VALUES ?p { rdfs:subClassOf }
+  ?s ?p ?o .
+}
+`)
+
 	return fmt.Sprintf(`
 PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
 PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
 PREFIX owl: <http://www.w3.org/2002/07/owl#>
 
-SELECT ?s ?p ?o
+SELECT DISTINCT ?s ?p ?o
 WHERE {
-  {
-    VALUES ?p { rdf:type }
-    ?s ?p ?o .
-    ?o rdf:type owl:Class .
-  }
-  UNION
-  {
-    VALUES ?p { rdfs:subClassOf }
-    ?s ?p ?o .
-  }
+%s
   FILTER(!isLiteral(?o))
   %s
 }
 ORDER BY ?s ?p ?o
 LIMIT %d
 OFFSET %d
-`, bnodeFilter, limit, offset)
+`, pattern, bnodeFilter, limit, offset)
 }
 
 func defaultPredicateQuery(includeBNodes bool) string {
@@ -40,6 +47,18 @@ func defaultPredicateQuery(includeBNodes bool) string {
 		bnodeFilter = "FILTER(!isBlank(?s) && !isBlank(?o))"
 	}
 
+	pattern := queryscope.NamedGraph(`
+{
+  VALUES ?p { rdf:type }
+  ?s ?p ?o .
+}
+UNION
+{
+  VALUES ?p { rdfs:subClassOf }
+  ?s ?p ?o .
+}
+`)
+
 	return fmt.Sprintf(`
 PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
 PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
@@ -47,19 +66,10 @@ PREFIX owl: <http://www.w3.org/2002/07/owl#>
 
 SELECT DISTINCT ?p
 WHERE {
-  {
-    VALUES ?p { rdf:type }
-    ?s ?p ?o .
-    ?o rdf:type owl:Class .
-  }
-  UNION
-  {
-    VALUES ?p { rdfs:subClassOf }
-    ?s ?p ?o .
-  }
+%s
   FILTER(!isLiteral(?o))
   %s
 }
 ORDER BY ?p
-`, bnodeFilter)
+`, pattern, bnodeFilter)
 }