Design Pattern in Brief (2)

Prototype

Prototype bisa dipandang sebagai salah satu alternatif dari Factory dan Abstract Factory. Untuk memahaminya bisa dilihat pada contoh-contoh berikut.



Design di atas bisa diimplementasikan dengan abstract factory seperti berikut :



Dengan prototype kita bisa mengimplementasikannya seperti :





public class HostingPlanKit {
private HostingPlan basicPlan;
private HostingPlan premiumPlan;
private HostingPlan premPlusPlan;
public HostingPlanKit(HostingPlan basic, HostingPlan premium,
HostingPlan premPlus) {
basicPlan = basic;
premiumPlan = premium;
premPlusPlan = premPlus;
}
public HostingPlan getBasicPlan() {
return (HostingPlan) basicPlan.clone();
}
public HostingPlan getPremiumPlan() {
return (HostingPlan) premiumPlan.clone();
}
public HostingPlan getPremPlusPlan() {
return (HostingPlan) premPlusPlan.clone();
}


public class HostingPlanManager {
public static HostingPlanKit getHostingPlanKit(
String platform) {
HostingPlan basicPlan = null;
HostingPlan premiumPlan = null;
HostingPlan premPlusPlan = null;
if (platform.equalsIgnoreCase("Win")) {
basicPlan = new WinBasic();
premiumPlan = new WinPremium();
premPlusPlan = new WinPremPlus();
}
if (platform.equalsIgnoreCase("Unix")) {
basicPlan = new UnixBasic();
premiumPlan = new UnixPremium();
premPlusPlan = new UnixPremPlus();
}
return new HostingPlanKit(basicPlan, premiumPlan,
premPlusPlan);
}
}