java - Best practice generating object for response -


i have rest server spring. there lot of requests 1 of params fields fields set of fields server should return in response. like: /?fields=[id,name] , server should return json object both fields know best practice generating such response. this:

private map<string, object> processbook(bookentity book, set<string> fields, string locale){         map<string, object> map = new hashmap<string, object>(); //..         if(fields.contains(id)){             map.put(id, book.getid());         }         if(fields.contains(isbn)){             map.put(isbn, book.getisbn());         }         if(fields.contains(description)){             if(locale.equals(userlocale.uk))        map.put(description, book.getdescriptionua());             else if(locale.equals(userlocale.ru))   map.put(description, book.getdescriptionru());             else                                    map.put(description, book.getdescriptionen());         } //..         return map;     }

maybe there better alternative?

note in case obtain data db - filled bookentity object, , show requested fields.

in opinion it'd "much better alternative" delegate field list appropriate downstream integration call , bookentity object necessary fields. mentioned above method reduce 1 line, db responses more lightweight, bring simplicity , optimization gain system.

any adequate db provides such functionality: sql or nosql, etc.

p.s. plus standard approach of object json mapping such jackson or gson @ top level.


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