Factory Pattern

Factory Pattern

abstract class User {
    function __construct($name)
    {
        $this->name = $name;
    }
     function getName()
    {
        return $this->name;
    }
     // Permission methods
    function hasReadPermission()
    {
        return true;
    }

     function hasModifyPermission()
    {
        return false;
    }
     function hasDeletePermission()
    {
        return false;
    }
     // Customization methods
    function wantsFlashInterface()
    {
        return true;
    }
     protected $name = NULL;
}
 
class GuestUser extends User {
}
 
class CustomerUser extends User {
   function hasModifyPermission()
    {
        return true;
    }
}
 
class AdminUser extends User {
   function hasModifyPermission()
    {
        return true;
    }
     function hasDeletePermission()
    {
        return true;
    }
     function wantsFlashInterface()
    {
        return false;
    }
}
 
class UserFactory {
    private static $users = array("Andi"=>"admin", "Stig"=>"guest",
                           "Derick"=>"customer");
 
    static function Create($name)
    {
        if (!isset(self::$users[$name])) {
            // Error out because the user doesn't exist
        }
        switch (self::$users[$name]) {
            case "guest": return new GuestUser($name);
            case "customer": return new CustomerUser($name);
            case "admin": return new AdminUser($name);
            default: // Error out because the user kind doesn't exist
        }                      
    }
}
 
function boolToStr($b)
{
    if ($b == true) {
        return "Yes\n";
    } else {
        return "No\n";
    }	
}
 
function displayPermissions(User $obj)
{
    print $obj->getName() . "'s permissions:\n";
    print "Read: " . boolToStr($obj->hasReadPermission());
    print "Modify: " . boolToStr($obj->hasModifyPermission());
    print "Delete: " . boolToStr($obj->hasDeletePermission());
 
}
 
function displayRequirements(User $obj)
{
    if ($obj->wantsFlashInterface()) {
        print $obj->getName() . " requires Flash\n";
    }
}
 
$logins = array("Andi", "Stig", "Derick");
 
foreach($logins as $login) {
    displayPermissions(UserFactory::Create($login)); 
    displayRequirements(UserFactory::Create($login));
}