A simple Proxy Pattern in Java

README.md

A simple Proxy Pattern in Java

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What is it?

Just a simple example of protecting some passwords via the Proxy Pattern

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References

• https://de.wikibooks.org/wiki/Muster:_Proxy
• http://www.tutorialspoint.com/design_pattern/proxy_pattern.htm
• https://en.wikipedia.org/wiki/Proxy_pattern

LukeSkywalkerPassword.java

package secure;

class LukeSkywalkerPassword implements Password {
    @Override
    public String getPassword() {
        return "F33lTheF0rc3";
    }
}

Main.java

public class Main {

    public static void main(String[] args) {
        PasswordManager manager = new PasswordManager();

        manager.setUser(new User("Stormtrooper 1", 22));
        System.out.println(manager.getPassword());

        manager.setUser(new User("Luke Skywalker", 21));
        System.out.println(manager.getPassword());

        manager.setUser(new User("Tom Hanks", 55));
        System.out.println(manager.getPassword());
    }

}

Password.java

package secure;

public interface Password {
    String getPassword();
}

PasswordManager.java

package secure;

public class PasswordManager implements Password {

    private User user;

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public String getPassword() {
        if (user.name.equals("Stormtrooper 1") && user.age == 22) {
            return new Stromtrooper1Password().getPassword();
        } else if (user.name.equals("Luke Skywalker") && user.age == 21) {
            return new LukeSkywalkerPassword().getPassword();
        }
        return null;
    }
}

Stromtrooper1Password.java

package secure;

class Stromtrooper1Password implements Password {
    @Override
    public String getPassword() {
        return "St0rmTr00p3r";
    }
}

User.java

package secure;

public class User {

    String name;
    int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }
}