<?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 null KeyCache that does not cache at all.

 * @package Swift

 * @subpackage KeyCache

 * @author Chris Corbyn

 */

class Swift_KeyCache_NullKeyCache implements Swift_KeyCache

{

  /**

   * Set a string into the cache under $itemKey for the namespace $nsKey.

   * @param string $nsKey

   * @param string $itemKey

   * @param string $string

   * @param int $mode

   * @see MODE_WRITE, MODE_APPEND

   */

  public function setString($nsKey, $itemKey, $string, $mode)

  {

  }

  /**

   * Set a ByteStream into the cache under $itemKey for the namespace $nsKey.

   * @param string $nsKey

   * @param string $itemKey

   * @param Swift_OutputByteStream $os

   * @param int $mode

   * @see MODE_WRITE, MODE_APPEND

   */

  public function importFromByteStream($nsKey, $itemKey, Swift_OutputByteStream $os,

    $mode)

  {

  }

  /**

   * Provides a ByteStream which when written to, writes data to $itemKey.

   * NOTE: The stream will always write in append mode.

   * @param string $nsKey

   * @param string $itemKey

   * @return Swift_InputByteStream

   */

  public function getInputByteStream($nsKey, $itemKey,

    Swift_InputByteStream $writeThrough = null)

  {

  }

  /**

   * Get data back out of the cache as a string.

   * @param string $nsKey

   * @param string $itemKey

   * @return string

   */

  public function getString($nsKey, $itemKey)

  {

  }

  /**

   * Get data back out of the cache as a ByteStream.

   * @param string $nsKey

   * @param string $itemKey

   * @param Swift_InputByteStream $is to write the data to

   */

  public function exportToByteStream($nsKey, $itemKey, Swift_InputByteStream $is)

  {

  }

  /**

   * Check if the given $itemKey exists in the namespace $nsKey.

   * @param string $nsKey

   * @param string $itemKey

   * @return boolean

   */

  public function hasKey($nsKey, $itemKey)

  {

    return false;

  }

  /**

   * Clear data for $itemKey in the namespace $nsKey if it exists.

   * @param string $nsKey

   * @param string $itemKey

   */

  public function clearKey($nsKey, $itemKey)

  {

  }

  /**

   * Clear all data in the namespace $nsKey if it exists.

   * @param string $nsKey

   */

  public function clearAll($nsKey)

  {

  }

}