transformed JenaRosenkeller importer to use Result-driven pipeline

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.cal.app/build.gradle.kts

@@ -3,4 +3,5 @@ description = "OpenCloudCal : Application"
 dependencies {
     implementation(project(":de.srsoftware.cal.api"))
     implementation(project(":de.srsoftware.cal.importer"))
+    implementation("de.srsoftware:tools.util:1.1.1")
 }

de.srsoftware.cal.app/src/main/java/de/srsoftware/cal/app/Application.java

@@ -1,12 +1,23 @@
 /* © SRSoftware 2024 */
 package de.srsoftware.cal.app;
 
+import de.srsoftware.cal.api.Appointment;
 import de.srsoftware.cal.importer.JenaRosenkeller;
+import de.srsoftware.tools.Payload;
 import java.io.IOException;
 
 public class Application {
 	public static void main(String[] args) throws IOException {
-		var rosenkeller = new JenaRosenkeller();
-		rosenkeller.fetch();
+		var rosenkeller	 = new JenaRosenkeller();
+		var appointments = rosenkeller.fetch();
+		appointments.forEach(res -> {
+			System.out.printf("class: %s%n", res.getClass());
+			if (res instanceof Payload<Appointment> payload) {
+				System.out.printf("payload: %s%n", payload.get().getClass());
+				System.out.println(payload.get());
+			} else {
+				System.err.println(res);
+			}
+		});
 	}
 }