Initial draft

lib/util.dart

@@ -0,0 +1,60 @@
+import 'package:intl/intl.dart';
+
+import 'model/delivery.dart';
+
+dynamic getValueOrThrowIfNotPresent(String key, Map<String, dynamic> json) {
+  if (!json.containsKey(key)) {
+    throw Exception("Wert '$key' in der Konfigurationsdatei nicht gefunden");
+  }
+
+  return json[key];
+}
+
+/// Returns the current date as string in format YYYY-MM-DD.
+String getTodayDate() {
+  return DateFormat('yyyy-MM-dd').format(DateTime.now());
+}
+
+String concatenateRegexMatches(String input, String pattern) {
+  final regex = RegExp(pattern);
+  final matches = regex.allMatches(input);
+
+  return matches.fold("", (acc, match) => acc + match[0]!);
+}
+
+/// Return the value or the default value if the string is empty.
+String getOrDefaultValueFromStr(String value, String defaultValue) {
+  if (value != "") {
+    return value;
+  } else {
+    return defaultValue;
+  }
+}
+
+DeliveryState getDeliveryStateFromString(String str) {
+  switch (str) {
+    case "laufend":
+      return DeliveryState.ongoing;
+    case "abgebrochen":
+      return DeliveryState.canceled;
+    case "vertagt":
+      return DeliveryState.onhold;
+    case "geliefert":
+      return DeliveryState.finished;
+    default:
+      throw Exception("Invalid state");
+  }
+}
+
+String getName(DeliveryState state) {
+  switch (state) {
+    case DeliveryState.ongoing:
+      return "laufend";
+    case DeliveryState.canceled:
+      return "abgebrochen";
+    case DeliveryState.onhold:
+      return "unterbrochen";
+    case DeliveryState.finished:
+      return "ausgeliefert";
+  }
+}