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   1  <?php
   2  /**
   3   * SimplePie
   4   *
   5   * A PHP-Based RSS and Atom Feed Framework.
   6   * Takes the hard work out of managing a complete RSS/Atom solution.
   7   *
   8   * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
   9   * All rights reserved.
  10   *
  11   * Redistribution and use in source and binary forms, with or without modification, are
  12   * permitted provided that the following conditions are met:
  13   *
  14   *     * Redistributions of source code must retain the above copyright notice, this list of
  15   *       conditions and the following disclaimer.
  16   *
  17   *     * Redistributions in binary form must reproduce the above copyright notice, this list
  18   *       of conditions and the following disclaimer in the documentation and/or other materials
  19   *       provided with the distribution.
  20   *
  21   *     * Neither the name of the SimplePie Team nor the names of its contributors may be used
  22   *       to endorse or promote products derived from this software without specific prior
  23   *       written permission.
  24   *
  25   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
  26   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  27   * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
  28   * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  32   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33   * POSSIBILITY OF SUCH DAMAGE.
  34   *
  35   * @package SimplePie
  36   * @version 1.3.1
  37   * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
  38   * @author Ryan Parman
  39   * @author Geoffrey Sneddon
  40   * @author Ryan McCue
  41   * @link http://simplepie.org/ SimplePie
  42   * @license http://www.opensource.org/licenses/bsd-license.php BSD License
  43   */
  44  
  45  /**
  46   * Used to create cache objects
  47   *
  48   * This class can be overloaded with {@see SimplePie::set_cache_class()},
  49   * although the preferred way is to create your own handler
  50   * via {@see register()}
  51   *
  52   * @package SimplePie
  53   * @subpackage Caching
  54   */
  55  class SimplePie_Cache
  56  {
  57      /**
  58       * Cache handler classes
  59       *
  60       * These receive 3 parameters to their constructor, as documented in
  61       * {@see register()}
  62       * @var array
  63       */
  64      protected static $handlers = array(
  65          'mysql' => 'SimplePie_Cache_MySQL',
  66          'memcache' => 'SimplePie_Cache_Memcache',
  67      );
  68  
  69      /**
  70       * Don't call the constructor. Please.
  71       */
  72  	private function __construct() { }
  73  
  74      /**
  75       * Create a new SimplePie_Cache object
  76       *
  77       * @param string $location URL location (scheme is used to determine handler)
  78       * @param string $filename Unique identifier for cache object
  79       * @param string $extension 'spi' or 'spc'
  80       * @return SimplePie_Cache_Base Type of object depends on scheme of `$location`
  81       */
  82  	public static function get_handler($location, $filename, $extension)
  83      {
  84          $type = explode(':', $location, 2);
  85          $type = $type[0];
  86          if (!empty(self::$handlers[$type]))
  87          {
  88              $class = self::$handlers[$type];
  89              return new $class($location, $filename, $extension);
  90          }
  91  
  92          return new SimplePie_Cache_File($location, $filename, $extension);
  93      }
  94  
  95      /**
  96       * Create a new SimplePie_Cache object
  97       *
  98       * @deprecated Use {@see get_handler} instead
  99       */
 100  	public function create($location, $filename, $extension)
 101      {
 102          trigger_error('Cache::create() has been replaced with Cache::get_handler(). Switch to the registry system to use this.', E_USER_DEPRECATED);
 103          return self::get_handler($location, $filename, $extension);
 104      }
 105  
 106      /**
 107       * Register a handler
 108       *
 109       * @param string $type DSN type to register for
 110       * @param string $class Name of handler class. Must implement SimplePie_Cache_Base
 111       */
 112  	public static function register($type, $class)
 113      {
 114          self::$handlers[$type] = $class;
 115      }
 116  
 117      /**
 118       * Parse a URL into an array
 119       *
 120       * @param string $url
 121       * @return array
 122       */
 123  	public static function parse_URL($url)
 124      {
 125          $params = parse_url($url);
 126          $params['extras'] = array();
 127          if (isset($params['query']))
 128          {
 129              parse_str($params['query'], $params['extras']);
 130          }
 131          return $params;
 132      }
 133  }