wp-includes/SimplePie/Cache/DB.php

   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  * Base class for database-based caches
  47  *
  48  * @package SimplePie
  49  * @subpackage Caching
  50  */
  51 abstract class SimplePie_Cache_DB implements SimplePie_Cache_Base
  52 {
  53         /**
  54          * Helper for database conversion
  55          *
  56          * Converts a given {@see SimplePie} object into data to be stored
  57          *
  58          * @param SimplePie $data
  59          * @return array First item is the serialized data for storage, second item is the unique ID for this item
  60          */
  61         protected static function prepare_simplepie_object_for_cache($data)
  62         {
  63                 $items = $data->get_items();
  64                 $items_by_id = array();
  65
  66                 if (!empty($items))
  67                 {
  68                         foreach ($items as $item)
  69                         {
  70                                 $items_by_id[$item->get_id()] = $item;
  71                         }
  72
  73                         if (count($items_by_id) !== count($items))
  74                         {
  75                                 $items_by_id = array();
  76                                 foreach ($items as $item)
  77                                 {
  78                                         $items_by_id[$item->get_id(true)] = $item;
  79                                 }
  80                         }
  81
  82                         if (isset($data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]))
  83                         {
  84                                 $channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0];
  85                         }
  86                         elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]))
  87                         {
  88                                 $channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0];
  89                         }
  90                         elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]))
  91                         {
  92                                 $channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0];
  93                         }
  94                         elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['channel'][0]))
  95                         {
  96                                 $channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['channel'][0];
  97                         }
  98                         else
  99                         {
 100                                 $channel = null;
 101                         }
 102
 103                         if ($channel !== null)
 104                         {
 105                                 if (isset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['entry']))
 106                                 {
 107                                         unset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['entry']);
 108                                 }
 109                                 if (isset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['entry']))
 110                                 {
 111                                         unset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['entry']);
 112                                 }
 113                                 if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item']))
 114                                 {
 115                                         unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item']);
 116                                 }
 117                                 if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item']))
 118                                 {
 119                                         unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item']);
 120                                 }
 121                                 if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_20]['item']))
 122                                 {
 123                                         unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_20]['item']);
 124                                 }
 125                         }
 126                         if (isset($data->data['items']))
 127                         {
 128                                 unset($data->data['items']);
 129                         }
 130                         if (isset($data->data['ordered_items']))
 131                         {
 132                                 unset($data->data['ordered_items']);
 133                         }
 134                 }
 135                 return array(serialize($data->data), $items_by_id);
 136         }
 137 }