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| Proxy Design pattern - Implementation [Protection Proxy] |
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| 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:
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