[client] Default language is now english

Added also a function that intercepts all exceptions while setting the provided language.

1 files changed, 32 insertions, 10 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/App.java b/dozentenmodul/src/main/java/org/openslx/dozmod/App.java
index 1ca0fe05..77203d50 100755
--- a/dozentenmodul/src/main/java/org/openslx/dozmod/App.java
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/App.java
@@ -8,6 +8,7 @@ import java.awt.event.ContainerEvent;
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Locale;
 import java.util.Set;
@@ -163,22 +164,18 @@ public class App {
 		setupLogger();
 
 		// Setting the locale
-		// Check first if preferred language exists
-		if (Config.getPreferredLanguage() != null) {
-			String[] locale = Config.getPreferredLanguage().split("_");
-			Locale.setDefault(new Locale(locale[0], locale[1]));
-		} else {
+		if (!setPreferredLanguage()) {
 			// Detect operating system language
 			String ul = System.getProperty("user.language");
-			if (ul.equals("en")) {
-				Locale.setDefault(new Locale("en", "US"));
-				Config.setPreferredLanguage(Language.EN_US.value);
+			if (ul.equals("de")) {
+				Locale.setDefault(new Locale("de", "DE"));
+				Config.setPreferredLanguage(Language.DE_DE.value);
 			} else if (ul.equals("tr")) {
 				Locale.setDefault(new Locale("tr", "TR"));
 				Config.setPreferredLanguage(Language.TR_TR.value);
 			} else {
-				Locale.setDefault(new Locale("de", "DE"));
-				Config.setPreferredLanguage(Language.DE_DE.value);
+				Locale.setDefault(new Locale("en", "US"));
+				Config.setPreferredLanguage(Language.EN_US.value);
 			}
 		}
 
@@ -372,6 +369,31 @@ public class App {
 		}
 	}
 
+	/**
+	 * Check if any default language is already set and valid.
+	 * @return true, if any default language exists and is valid.
+	 */
+	private static boolean setPreferredLanguage() {
+		// Check if any preferred language exists
+		String language = Config.getPreferredLanguage();
+		// Check whether the provided string is null or empty
+		if (language == null || language.trim().isEmpty()) {
+			return false;
+		}
+		// Check if the provided string has the format language_country e.g. en_US
+		String[] parts = language.split("_");
+		if (parts.length != 2) {
+			return false;
+		}
+		Locale locale = new Locale(parts[0], parts[1]);
+		// Check now if the locale is valid
+		if (!Arrays.asList(Locale.getAvailableLocales()).contains(locale)) {
+			return false;
+		}
+		Locale.setDefault(locale);
+		return true;
+	}
+
 	public static synchronized boolean isInitDone() {
 		return proxyInitDone;
 	}