-- (NJMapping *)mappingWithURL:(NSURL *)url error:(NSError **)error {
- NSInputStream *stream = [NSInputStream inputStreamWithURL:url];
- [stream open];
- NSDictionary *serialization = !*error
- ? [NSJSONSerialization JSONObjectWithStream:stream options:0 error:error]
- : nil;
- [stream close];
-
- if (!([serialization isKindOfClass:NSDictionary.class]
- && [serialization[@"name"] isKindOfClass:NSString.class]
- && [serialization[@"entries"] isKindOfClass:NSDictionary.class])) {
- *error = [NSError errorWithDomain:@"Enjoyable"
- code:0
- description:@"This isn't a valid mapping file."];
- return nil;
- }
-
- NSDictionary *entries = serialization[@"entries"];
- NJMapping *mapping = [[NJMapping alloc] initWithName:serialization[@"name"]];
- for (id key in entries) {
- NSDictionary *value = entries[key];
- if ([key isKindOfClass:NSString.class]) {
- NJOutput *output = [NJOutput outputDeserialize:value
- withMappings:_mappings];
- if (output)
- mapping.entries[key] = output;
- }
- }
- return mapping;
-}
-