اجرای پترن در جاوا

[askari.khosravani]

سلام
من پترن جاوا رو گرفتم ولی نمی دونم چه طوری اجرا می شه کسی هست که بتونه به ما کمک کنه؟؟؟؟؟؟؟؟؟؟؟
ممنون میشم به خاطره شبه امتحانه...............دیگه

package accounting;

import java.lang.reflect.Constructor;

import java.util.HashMap;
public class ServicesFactory {
private static IObject interfaceObjectAdaptor;
private static String interfaceClassAdaptorString;
private static ServicesFactory factory;
private static HashMap<String,Constructor<?>> serviceAdapters;
private static HashMap<String,IObject> serviceObjects = new HashMap<String, IObject>();;
private ServicesFactory( ){}
//ExampleFactory (a singleton)

public synchronized static ServicesFactory getServiceFactory(HashMap<String,Constructor<?>> factoryServices){
if( factory == null ){
serviceAdapters = factoryServices;
factory = new ServicesFactory();
}
return factory;
}

public void setAdapterName(String cls ) {
this.interfaceClassAdaptorString = cls;
}

public IObject getAdaptor(){
String adapterName = this.interfaceClassAdaptorString;
try{

if( this.interfaceObjectAdaptor == null){
Object obj = null;
Constructor<?> con = null;
Class<?> cl = System.class;
adapterName = System.getProperty(adapterName);

this.interfaceObjectAdaptor = (IObject)Class.forName(adapterName).newInstance();
}

} catch(Exception e) {
}
return this.interfaceObjectAdaptor;
}

public boolean factoryItemExists(Constructor<?> cls){
return ServicesFactory.serviceAdapters.containsValue(cls) ;
}
public IObject getAdapter(String adapter){
//create a Service object,
try{
Object obj = null;
Constructor<?> cl = null;
Class cls;
String str = null;
cl = ServicesFactory.serviceAdapters.get(adapter);
obj = cl.getClass();
obj = serviceObjects.get(obj);
if( obj == null)
{
obj = cl.newInstance();
serviceObjects.put(adapter,(IObject) obj);
}
return (IObject) obj;
} catch(Exception e) {
return null;
}
}

}
package accounting;

import accounting.*;

import java.lang.reflect.Constructor;
import java.util.HashMap;

public class AccountingServices {
private HashMap<String,Constructor<?>> services;
private ServicesFactory servicesFactory;
public AccountingServices(){
try{
services = new HashMap<String, Constructor<?>>();
Class cls = accounting.SAPAdapter.class;
Constructor<?> con = cls.getConstructor(null);
con.setAccessible(true);
services.put("SAPAdapter",con);
cls = accounting.NorthernAccountingAdapter.class;
con = cls.getConstructor(null);
con.setAccessible(true);
services.put("NorthernAccountingAdapter",con);

servicesFactory = ServicesFactory.getServiceFactory(services);
servicesFactory.setAdapterName("accountingfirm.class.name");

}catch(Exception e){}
}

public IAccountingAdaptor getAccountingAdaptor(String cls){
return (IAccountingAdaptor)servicesFactory.getAdapter(cls );
}

public IAccountingAdaptor getAccountingAdaptor(){
return (IAccountingAdaptor)servicesFactory.getAdaptor();
}

public static void main(String args[]) {
IAccountingAdaptor myIface = null;
String adapter1 = "SAPAdapter";
String adapter2 = "NorthernAccountingAdapter";
AccountingServices sb = new AccountingServices();
myIface = sb.getAccountingAdaptor(adapter1);
myIface.postReceivable("Factory Made");
myIface.postSale("Factory Made");
myIface = sb.getAccountingAdaptor(adapter2);
myIface.postReceivable("Factory Made");
myIface.postSale("Factory Made");
myIface = sb.getAccountingAdaptor();
myIface.postReceivable("Factory Made");
myIface.postSale("Factory Made");
}
}