contacts: query for group name

Author: angelo-v

contacts/src/rdflib/queries/GroupQuery.spec.ts

@@ -0,0 +1,66 @@
+import { graph, lit, sym } from "rdflib";
+import { GroupQuery } from "./GroupQuery";
+import { rdf, vcard } from "../namespaces";
+
+describe(GroupQuery.name, () => {
+  describe("query name", () => {
+    it("returns nothing if store is empty", () => {
+      const store = graph();
+
+      const query = new GroupQuery(
+        store,
+        sym("https://pod.test/alice/group/1/index.ttl#this"),
+      );
+      const result = query.queryName();
+      expect(result).toEqual("");
+    });
+
+    it("returns the group's vcard:fn from the group document", () => {
+      const store = graph();
+      store.add(
+        sym("https://pod.test/alice/group/1/index.ttl#this"),
+        vcard("fn"),
+        lit("Family"),
+        sym("https://pod.test/alice/group/1/index.ttl"),
+      );
+      const query = new GroupQuery(
+        store,
+        sym("https://pod.test/alice/group/1/index.ttl#this"),
+      );
+      const result = query.queryName();
+      expect(result).toEqual("Family");
+    });
+
+    it("returns nothing if vcard:fn is from wrong group", () => {
+      const store = graph();
+      store.add(
+        sym("https://pod.test/alice/group/1/index.ttl#other"),
+        vcard("fn"),
+        lit("Family"),
+        sym("https://pod.test/alice/group/1/index.ttl"),
+      );
+      const query = new GroupQuery(
+        store,
+        sym("https://pod.test/alice/group/1/index.ttl#this"),
+      );
+      const result = query.queryName();
+      expect(result).toEqual("");
+    });
+
+    it("returns nothing, if vcard:fn is missing", () => {
+      const store = graph();
+      store.add(
+        sym("https://pod.test/alice/group/1/index.ttl#this"),
+        rdf("type"),
+        vcard("Group"),
+        sym("https://pod.test/alice/group/1/index.ttl"),
+      );
+      const query = new GroupQuery(
+        store,
+        sym("https://pod.test/alice/group/1/index.ttl#this"),
+      );
+      const result = query.queryName();
+      expect(result).toEqual("");
+    });
+  });
+});

contacts/src/rdflib/queries/GroupQuery.ts

@@ -0,0 +1,23 @@
+import { IndexedFormula, NamedNode } from "rdflib";
+import { vcard } from "../namespaces";
+
+export class GroupQuery {
+  private groupDoc: NamedNode;
+
+  constructor(
+    private store: IndexedFormula,
+    public groupNode: NamedNode,
+  ) {
+    this.groupDoc = groupNode.doc();
+  }
+  queryName(): string {
+    return (
+      this.store.anyValue(
+        this.groupNode,
+        vcard("fn"),
+        undefined,
+        this.groupDoc,
+      ) ?? ""
+    );
+  }
+}