made Appointment.location() return an optional

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

build.gradle.kts

@@ -12,7 +12,6 @@ spotless {
         removeUnusedImports()
         importOrder()
         licenseHeader("/* © SRSoftware 2024 */")
-        toggleOffOn()
     }
 }
 

de.srsoftware.cal.api/src/main/java/de/srsoftware/cal/api/Appointment.java

@@ -65,7 +65,7 @@ public interface Appointment {
 	 * descriptive text of the location, e.g. address
 	 * @return location text
 	 */
-	String location();
+	Optional<String> location();
 
 	/**
 	 * The date and time, when the appointment starts

de.srsoftware.cal.base/src/main/java/de/srsoftware/cal/BaseAppointment.java

@@ -134,7 +134,7 @@ public class BaseAppointment implements Appointment {
 		sb.append(contentLine(SUMMARY,title()));
 		sb.append(contentLine(DESCRIPTION,description()));
 		coords().map(Coords::icalFormat).map(geo -> contentLine(GEO,geo)).ifPresent(sb::append);
-		if (!location().isBlank()) sb.append(contentLine(LOCATION,location()));
+		location().map(loc -> contentLine(LOCATION,loc)).ifPresent(sb::append);
 		for (var attachment : attachments()) sb.append(contentLine("ATTACH;FMTYPE=%s".formatted(attachment.mime()),attachment.url().toString()));
 		for (var link : links) sb.append(contentLine("ATTACH;TITLE="+paramText(link.desciption()),link.url().toString()));
 		sb.append(contentLine("CLASS","PUBLIC"));
@@ -156,7 +156,7 @@ public class BaseAppointment implements Appointment {
 		json.put("description", description());
 		json.put("end", end().map(end -> end.format(DATE_TIME)).orElse(null));
 		json.put("id", id());
-		json.put("location", location());
+		json.put("location", location().orElse(null));
 		json.put("start", start().format(DATE_TIME));
 		json.put("tags", tags());
 		json.put("title", title());
@@ -166,8 +166,8 @@ public class BaseAppointment implements Appointment {
 	}
 
 	@Override
-	public String location() {
-		return location;
+	public Optional<String> location() {
+		return nullable(location);
 	}
 
 	@Override

de.srsoftware.cal.db/src/main/java/de/srsoftware/cal/db/MariaDB.java

@@ -62,7 +62,7 @@ public class MariaDB implements Database {
 	public Result<Appointment> add(Appointment appointment) {
 		try {
 			ResultSet keys = insertInto(APPOINTMENTS, TITLE, DESCRIPTION, START, END, LOCATION, COORDS)  //
-				     .values(appointment.title(), appointment.description(), appointment.start(), appointment.end().orElse(null), appointment.location(), appointment.coords().orElse(null))
+				     .values(appointment.title(), appointment.description(), appointment.start(), appointment.end().orElse(null), appointment.location().orElse(null), appointment.coords().orElse(null))
 				     .execute(connection)
 				     .getGeneratedKeys();
 			Appointment saved = null;
@@ -316,7 +316,7 @@ public class MariaDB implements Database {
 			    .set(TITLE, DESCRIPTION, START, END, LOCATION, COORDS)
 			    .where(AID, equal(event.id()))
 			    .prepare(connection)
-			    .apply(event.title(), event.description(), Timestamp.valueOf(event.start()), end, event.location(), event.coords().orElse(null));
+			    .apply(event.title(), event.description(), Timestamp.valueOf(event.start()), end, event.location().orElse(null), event.coords().orElse(null));
 
 			// TODO: update links, attachments, tags