completed CRUD operations

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

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

@@ -70,6 +70,7 @@ public abstract class BaseImporter implements Importer {
 		return Error.of("not implemented");
 	}
 
+
 	protected Result<LocalDateTime> extractEnd(Tag eventTag) {
 		Result<Tag> endTag = extractEndTag(eventTag);
 		if (endTag.optional().isEmpty()) return transform(endTag);

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

@@ -0,0 +1,23 @@
+/* © SRSoftware 2024 */
+package de.srsoftware.cal;
+
+import de.srsoftware.cal.api.Coords;
+import de.srsoftware.tools.Error;
+import de.srsoftware.tools.Payload;
+import de.srsoftware.tools.Result;
+
+public class Util {
+	public static Result<Coords> extractCoords(String coords) {
+		if (coords == null) return de.srsoftware.tools.Error.of("Argument is null");
+		if (coords.isBlank()) return de.srsoftware.tools.Error.of("Argument is blank");
+		var parts = coords.split(",");
+		if (parts.length != 2) return de.srsoftware.tools.Error.format("Argument has invalid format: %s", coords);
+		try {
+			var lat = Double.parseDouble(parts[0].trim());
+			var lon = Double.parseDouble(parts[1].trim());
+			return Payload.of(new Coords(lon, lat));
+		} catch (NumberFormatException nfe) {
+			return Error.of("Failed to parse coords from %s".formatted(coords), nfe);
+		}
+	}
+}