java - reduce number of cases from a switch -

i have following piece of code. it's kind of factory function retrieves instance of writer base on it's type. notice type enum.

public writer getwriter(writertypeenum type){   switch(type){     case a: new awriter() break;     case b: ... break;     case c: ... break;     ...   } } 

the problem have 30 cases. can reduce them or not implement them @ all?

i solved cases in past using strategy pattern here facing old enum used in entire app. other problem cannot inject spring beans enum. of instances switch cases beans.

the writertypeenum has id coming ui , based on id have determine right instance.

you can setup enum have abstract method

public abstract writer getwriter(); 

and after that, instances have implement method, example

public enum yourenum{     first(){         public writer getwriter(){             return null;         }     }, ... // other enums      public abstract writer getwriter();  } 

or omit break in switch, if there repeating statements