<?php

  namespace Sabre\DAV\Exception;
  
  use Sabre\DAV;

  /**
   * PreconditionFailed
   *
   * This exception is normally thrown when a client submitted a conditional request,
   * like for example an If, If-None-Match or If-Match header, which caused the HTTP
   * request to not execute (the condition of the header failed)
   *

   * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
   * @author Evert Pot (http://evertpot.com/)
   * @license http://sabre.io/license/ Modified BSD License

   */

  class PreconditionFailed extends DAV\Exception {

  
      /**
       * When this exception is thrown, the header-name might be set.
       *
       * This allows the exception-catching code to determine which HTTP header
       * caused the exception.
       *
       * @var string
       */
      public $header = null;
  
      /**
       * Create the exception
       *
       * @param string $message
       * @param string $header
       */
      public function __construct($message, $header=null) {
  
          parent::__construct($message);
          $this->header = $header;
  
      }
  
      /**
       * Returns the HTTP statuscode for this exception
       *
       * @return int
       */
      public function getHTTPCode() {
  
          return 412;
  
      }
  
      /**
       * This method allows the exception to include additional information into the WebDAV error response
       *

       * @param DAV\Server $server
       * @param \DOMElement $errorNode

       * @return void
       */

      public function serialize(DAV\Server $server,\DOMElement $errorNode) {

  
          if ($this->header) {
              $prop = $errorNode->ownerDocument->createElement('s:header');
              $prop->nodeValue = $this->header;
              $errorNode->appendChild($prop);
          }
  
      }
  
  }