Zend: Doctrine Auth Adapter

Aca pongo a su disposición el adaptador para autorización que desarrolle para Zend utilizando el ORM Doctrine, Suerte.

class Doctrine_Auth_Adapter implements Zend_Auth_Adapter_Interface{
private $_tablename=null;
private $_identityColumn=null;
private $_credentialColumn=null;
private $_identity;
private $_credential=null;
private $_resultRow=null;
public function __construct( $tableName=null, $identityColumn=null, $credentialColumn=null) {
$this->_tableName=$tableName;
$this->_identityColumn=$identityColumn;
$this->_credentialColumn=$credentialColumn;
} //end function
public function setIdentity($identity) {
$this->_identity=$identity;
return $this;
} //end function
public function setCredential($credential) {
$this->_credential=$credential;
return $this;
} //end function
public function setIdentityColumn($identityColumn) {
$this->_identityColumn=$identityColumn;
return $this;
} //end function
public function setCredentialColumn($credentialColumn) {
$this->_credentialColumn=$credentialColumn;
return $this;
} //end function
function getResultRowObject() {
if (!$this->_resultRow) return false;
$returnObject = new stdClass();
foreach ($this->_resultRow as $resultColumn => $resultValue) {
  $returnObject->{$resultColumn} = $resultValue;
}
return $returnObject;
} //end function

public function authenticate() {
$authResult = array(
                    'code'     => Zend_Auth_Result::FAILURE,
                    'identity' => $this->_identity,
                    'messages' => array()
                    );
$usr=Doctrine_Query::create()->from($this->_tableName)->where($this->_identityColumn.'=?',$this->_identity)->fetchArray();
if (count($usr)==0) {
  $authResult['code'] = Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND;
  $authResult['messages'][] = 'Login failed';
} //end if
else{
  if ($usr[0][$this->_credentialColumn]==$this->_credential){
    $this->_resultRow=$usr[0];
    $authResult['code'] = Zend_Auth_Result::SUCCESS;
    $authResult['messages'][] = 'Login succesful';
  }
  else{
    $authResult['code'] = Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID;
    $authResult['messages'][] = 'Password failed';
  }
}
return new Zend_Auth_Result($authResult['code'],$authResult['identity'],$authResult['messages']);
} //end function

}//end class