Stabla/StabloOpstegTipa/Konverter.java

   1 // Instance ove klase konvertuju string u neki konkretan tip podataka i obratno
   2 // Takodje je dato par gotovih implementacija konvertera
   3 public interface Konverter<T> {
   4
   5         public String toString(T element);
   6         public T fromString(String string);
   7
   8         public static Konverter<Integer> INTEGER = new Konverter<Integer>() {
   9                 @Override public String toString(Integer element) { return element == null ? null : element.toString(); }
  10                 @Override public Integer fromString(String string) { return string == null ? null : Integer.parseInt(string); }
  11         };
  12
  13         public static Konverter<Long> LONG = new Konverter<Long>() {
  14                 @Override public String toString(Long element) { return element == null ? null : element.toString(); }
  15                 @Override public Long fromString(String string) { return string == null ? null : Long.parseLong(string); }
  16         };
  17
  18         public static Konverter<Double> DOUBLE = new Konverter<Double>() {
  19                 @Override public String toString(Double element) { return element == null ? null : element.toString(); }
  20                 @Override public Double fromString(String string) { return string == null ? null : Double.parseDouble(string); }
  21         };
  22
  23         public static Konverter<String> STRING = new Konverter<String>() {
  24                 @Override public String toString(String element) { return element; }
  25                 @Override public String fromString(String string) { return string; }
  26         };
  27
  28         public static Konverter<Osoba> OSOBA = new Konverter<Osoba>() {
  29                 @Override public String toString(Osoba element) { return element == null ? null : element.getIme() + " " + element.getPrezime() + " " + element.getGodinaRodjenja(); }
  30                 @Override public Osoba fromString(String string) { if (string == null) return null; else { String[] delovi = string.split(" "); return new Osoba(delovi[0], delovi[1], Integer.parseInt(delovi[2]));} }
  31         };
  32
  33 }