Public String Value(String field){
     String returnField;
     If ( field == Constant Value1){
      List<CustomObject> List = [SELECT Name 1 from CustomObject WHERE Field1=ABCD];
  returnField = get.List(1);
     }
     else if (field == Certain Constant Value2){
     List<CustomObject> List = [SELECT Name 1 from CustomObject WHERE Field1=ABCD];
  returnField = get.List(1);
     }
   //a few other similar conditions
return returnfield;
}