Wednesday, 20 November 2013

Proxy Design pattern - Implementation [Protection Proxy]


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Proxy Design pattern - Implementation [Protection Proxy]
Proxy Design pattern - Implementation [Protection Proxy] - Class Diagram







































User.java

public class User
{

private String userName;
private String passWord;
private String designation;

public User(String userName, String passWord, String designation)
{
super();
this.userName = userName;
this.passWord = passWord;
this.designation = designation;
}

public String getUserName()
{
return userName;
}

public void setUserName(String userName)
{
this.userName = userName;
}

public String getPassWord()
{
return passWord;
}

public void setPassWord(String passWord)
{
this.passWord = passWord;
}

public String getDesignation()
{
return designation;
}

public void setDesignation(String designation)
{
this.designation = designation;
}

@Override
public String toString()
{
return "User [userName=" + userName + ", passWord=" + passWord + ", designation=" + designation + "]";
}

}


IFolder.java

public interface IFolder
{
public void performReadOrWriteOperations();
}

Folder.java

public class Folder implements IFolder
{

@Override
        public void performReadOrWriteOperations()
        {
System.out.println(this.getClass()+" : Performing read or write operation on the folder");          
        }
}

FolderProxy.java
public class FolderProxy implements IFolder
{
private Folder folder;
private User   user;

public FolderProxy( User user )
{
this.user = user;
}

@Override
public void performReadOrWriteOperations()
{

if( user.getDesignation().equalsIgnoreCase("CEO") || user.getDesignation().equalsIgnoreCase("Manager") )
{
folder = new Folder();
System.out.println(this.getClass()+" : Folder Proxy makes call to the RealFolder 'performReadOrWriteOperations method'");
folder.performReadOrWriteOperations();
}
else
{
System.out.println(this.getClass()+": Folder proxy says 'You don't have access to this folder'");
}

}

}

Client.java

public class Client
{
public static void main( String[] args )
{
new Client().folderAccess();
}

private  void folderAccess()
        {
       System.out.println(this.getClass()+" : Client passing user with designation 'CEO' to folderproxy");
User john = new User("John", "John123","CEO");
FolderProxy folderProxy = new FolderProxy(john);
folderProxy.performReadOrWriteOperations();
System.out.println("\n************************************************************           ***********************\n");
System.out.println(this.getClass()+" : Client passing user with designation 'Developer' to folderproxy");
User raj = new User("Raj", "Raj123","Developer");
FolderProxy folderProxyWrong = new FolderProxy(raj);
folderProxyWrong.performReadOrWriteOperations();
        }
}

Output

class Client : Client passing user with designation 'CEO' to folderproxy
class FolderProxy : Folder Proxy makes call to the RealFolder 'performReadOrWriteOperations method'
class Folder : Performing read or write operation on the folder

*********************************************************************************

class Client : Client passing user with designation 'Developer' to folderproxy
class FolderProxy: Folder proxy says 'You don't have access to this folder'

See also:

  • Proxy Design Pattern - Introduction
  • Proxy Design pattern - Real Time Example[ATM]
  • Proxy Design pattern - Real Time Example [Proxy Server]
  • Proxy Design pattern - Class Diagram
  • Proxy Design pattern - Sequence Diagram
  • Proxy Design pattern - Implementation [Remote Proxy]
  • Proxy Design pattern - Implementation[Virtual Proxy]
  • Proxy Design Pattern - Key Points
  • All Design Patterns Links
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