1 files changed, 33 insertions, 0 deletions
diff --git a/platform/osx/app/OfflinePackNameValueTransformer.m b/platform/osx/app/OfflinePackNameValueTransformer.m
new file mode 100644
index 0000000000..2825e48ed3
--- /dev/null
+++ b/platform/osx/app/OfflinePackNameValueTransformer.m
@@ -0,0 +1,33 @@
+#import "OfflinePackNameValueTransformer.h"
+
+static NSString * const MBXOfflinePackContextNameKey = @"Name";
+
+@implementation OfflinePackNameValueTransformer
+
++ (Class)transformedValueClass {
+    return [NSString class];
+}
+
++ (BOOL)allowsReverseTransformation {
+    return YES;
+}
+
+- (NSString *)transformedValue:(NSData *)context {
+    NSAssert([context isKindOfClass:[NSData class]], @"Context should be NSData.");
+    
+    NSDictionary *userInfo = [NSKeyedUnarchiver unarchiveObjectWithData:context];
+    NSAssert([userInfo isKindOfClass:[NSDictionary class]], @"Context of offline pack isn’t a dictionary.");
+    NSString *name = userInfo[MBXOfflinePackContextNameKey];
+    NSAssert([name isKindOfClass:[NSString class]], @"Name of offline pack isn’t a string.");
+    return name;
+}
+
+- (NSData *)reverseTransformedValue:(NSString *)name {
+    NSAssert([name isKindOfClass:[NSString class]], @"Name should be a string.");
+    
+    return [NSKeyedArchiver archivedDataWithRootObject:@{
+        MBXOfflinePackContextNameKey: name,
+    }];
+}
+
+@end