Accelerated basic page loading by caching the user language

SoObjects/SOGo/SOGoUserDefaults.h

@@ -35,6 +35,9 @@ extern NSString *SOGoWeekStartFirst4DayWeek;
 extern NSString *SOGoWeekStartFirstFullWeek;
 
 @interface SOGoUserDefaults : SOGoDefaultsSource
+{
+  NSString *userLanguage;
+}
 
 + (SOGoUserDefaults *) defaultsForUser: (NSString *) userId
                               inDomain: (NSString *) domainId;

SoObjects/SOGo/SOGoUserDefaults.m

@@ -22,6 +22,7 @@
 
 #import <Foundation/NSArray.h>
 #import <Foundation/NSDictionary.h>
+#import <Foundation/NSSet.h>
 #import <Foundation/NSString.h>
 #import <Foundation/NSTimeZone.h>
 
@@ -91,6 +92,22 @@ NSString *SOGoWeekStartFirstFullWeek = @"FirstFullWeek";
   return ud;
 }
 
+- (id) init
+{
+  if ((self = [super init]))
+    {
+      userLanguage = nil;
+    }
+
+  return self;
+}
+
+- (void) dealloc
+{
+  [userLanguage release];
+  [super dealloc];
+}
+
 - (BOOL) _migrateLastModule
 {
   BOOL rc;
@@ -355,21 +372,25 @@ NSString *SOGoWeekStartFirstFullWeek = @"FirstFullWeek";
 
 - (NSString *) language
 {
-  NSString *language;
   NSArray *supportedLanguages;
-  
-  /* see SOGoDomainDefaults for the meaning of this */
-  language = [source objectForKey: @"SOGoLanguage"];
-  if (!(language && [language isKindOfClass: [NSString class]]))
-    language = [(SOGoDomainDefaults *) parentSource language];
-  
-  /* make sure the language is part of the supported languages */
-  supportedLanguages = [[SOGoSystemDefaults sharedSystemDefaults]
-                         supportedLanguages];
-  if (![supportedLanguages containsObject: language])
-    language = [parentSource stringForKey: @"SOGoLanguage"];
 
-  return language;
+  if (!userLanguage)
+    {
+      /* see SOGoDomainDefaults for the meaning of this */
+      userLanguage = [source objectForKey: @"SOGoLanguage"];
+      if (!(userLanguage && [userLanguage isKindOfClass: [NSString class]]))
+        userLanguage = [(SOGoDomainDefaults *) parentSource language];
+  
+      supportedLanguages = [[SOGoSystemDefaults sharedSystemDefaults]
+                             supportedLanguages];
+
+      /* make sure the language is part of the supported languages */
+      if (![supportedLanguages containsObject: userLanguage])
+        userLanguage = [parentSource stringForKey: @"SOGoLanguage"];
+      [userLanguage retain];
+    }
+
+  return userLanguage;
 }
 
 - (void) setMailShowSubscribedFoldersOnly: (BOOL) newValue