<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */


/**
 * A Path Header in Swift Mailer, such a Return-Path.
 * @package Swift
 * @subpackage Mime
 * @author Chris Corbyn
 */
class Swift_Mime_Headers_PathHeader extends Swift_Mime_Headers_AbstractHeader
{
  
  /**
   * The address in this Header (if specified).
   * @var string
   * @access private
   */
  private $_address;
  
  /**
   * Creates a new PathHeader with the given $name.
   * @param string $name
   * @param Swift_Mime_Grammar $grammar
   */
  public function __construct($name, Swift_Mime_Grammar $grammar)
  {
    $this->setFieldName($name);
    parent::__construct($grammar);
  }
  
  /**
   * Get the type of Header that this instance represents.
   * @return int
   * @see TYPE_TEXT, TYPE_PARAMETERIZED, TYPE_MAILBOX
   * @see TYPE_DATE, TYPE_ID, TYPE_PATH
   */
  public function getFieldType()
  {
    return self::TYPE_PATH;
  }
  
  /**
   * Set the model for the field body.
   * This method takes a string for an address.
   * @param string $model
   * @throws Swift_RfcComplianceException
   */
  public function setFieldBodyModel($model)
  {
    $this->setAddress($model);
  }
  
  /**
   * Get the model for the field body.
   * This method returns a string email address.
   * @return mixed
   */
  public function getFieldBodyModel()
  {
    return $this->getAddress();
  }
  
  /**
   * Set the Address which should appear in this Header.
   * @param string $address
   * @throws Swift_RfcComplianceException
   */
  public function setAddress($address)
  {
    if (is_null($address))
    {
      $this->_address = null;
    }
    elseif ('' == $address)
    {
      $this->_address = '';
    }
    else
    {
      $this->_assertValidAddress($address);
      $this->_address = $address;
    }
    $this->setCachedValue(null);
  }
  
  /**
   * Get the address which is used in this Header (if any).
   * Null is returned if no address is set.
   * @return string
   */
  public function getAddress()
  {
    return $this->_address;
  }
  
  /**
   * Get the string value of the body in this Header.
   * This is not necessarily RFC 2822 compliant since folding white space will
   * not be added at this stage (see {@link toString()} for that).
   * @return string
   * @see toString()
   */
  public function getFieldBody()
  {
    if (!$this->getCachedValue())
    {
      if (isset($this->_address))
      {
        $this->setCachedValue('<' . $this->_address . '>');
      }
    }
    return $this->getCachedValue();
  }
  
  /**
   * Throws an Exception if the address passed does not comply with RFC 2822.
   * @param string $address
   * @throws Swift_RfcComplianceException If invalid.
   * @access private
   */
  private function _assertValidAddress($address)
  {
    if (!preg_match('/^' . $this->getGrammar()->getDefinition('addr-spec') . '$/D',
      $address))
    {
      throw new Swift_RfcComplianceException(
        'Address set in PathHeader does not comply with addr-spec of RFC 2822.'
        );
    }
  }
  
}
