Add filter, add READMES

backend_go/graph_queries/default.go

@@ -0,0 +1,34 @@
+package graph_queries
+
+import "fmt"
+
+func defaultEdgeQuery(edgeLimit int, includeBNodes bool) string {
+	bnodeFilter := ""
+	if !includeBNodes {
+		bnodeFilter = "FILTER(!isBlank(?s) && !isBlank(?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
+WHERE {
+  {
+    VALUES ?p { rdf:type }
+    ?s ?p ?o .
+    ?o rdf:type owl:Class .
+  }
+  UNION
+  {
+    VALUES ?p { rdfs:subClassOf }
+    ?s ?p ?o .
+  }
+  FILTER(!isLiteral(?o))
+  %s
+}
+LIMIT %d
+`, bnodeFilter, edgeLimit)
+}
+

backend_go/graph_queries/hierarchy.go

@@ -0,0 +1,24 @@
+package graph_queries
+
+import "fmt"
+
+func hierarchyEdgeQuery(edgeLimit int, includeBNodes bool) string {
+	bnodeFilter := ""
+	if !includeBNodes {
+		bnodeFilter = "FILTER(!isBlank(?s) && !isBlank(?o))"
+	}
+
+	return fmt.Sprintf(`
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+
+SELECT ?s ?p ?o
+WHERE {
+  VALUES ?p { rdfs:subClassOf }
+  ?s ?p ?o .
+  FILTER(!isLiteral(?o))
+  %s
+}
+LIMIT %d
+`, bnodeFilter, edgeLimit)
+}
+

backend_go/graph_queries/registry.go

@@ -0,0 +1,27 @@
+package graph_queries
+
+const DefaultID = "default"
+
+var definitions = []Definition{
+	{Meta: Meta{ID: DefaultID, Label: "Default"}, EdgeQuery: defaultEdgeQuery},
+	{Meta: Meta{ID: "hierarchy", Label: "Hierarchy"}, EdgeQuery: hierarchyEdgeQuery},
+	{Meta: Meta{ID: "types", Label: "Types"}, EdgeQuery: typesOnlyEdgeQuery},
+}
+
+func List() []Meta {
+	out := make([]Meta, 0, len(definitions))
+	for _, d := range definitions {
+		out = append(out, d.Meta)
+	}
+	return out
+}
+
+func Get(id string) (Definition, bool) {
+	for _, d := range definitions {
+		if d.Meta.ID == id {
+			return d, true
+		}
+	}
+	return Definition{}, false
+}
+

backend_go/graph_queries/types.go

@@ -0,0 +1,12 @@
+package graph_queries
+
+type Meta struct {
+	ID    string `json:"id"`
+	Label string `json:"label"`
+}
+
+type Definition struct {
+	Meta      Meta
+	EdgeQuery func(edgeLimit int, includeBNodes bool) string
+}
+

backend_go/graph_queries/types_only.go

@@ -0,0 +1,26 @@
+package graph_queries
+
+import "fmt"
+
+func typesOnlyEdgeQuery(edgeLimit int, includeBNodes bool) string {
+	bnodeFilter := ""
+	if !includeBNodes {
+		bnodeFilter = "FILTER(!isBlank(?s) && !isBlank(?o))"
+	}
+
+	return fmt.Sprintf(`
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+
+SELECT ?s ?p ?o
+WHERE {
+  VALUES ?p { rdf:type }
+  ?s ?p ?o .
+  ?o rdf:type owl:Class .
+  FILTER(!isLiteral(?o))
+  %s
+}
+LIMIT %d
+`, bnodeFilter, edgeLimit)
+}
+