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) 2004-2016, Ryan Parman, Sam 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 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
37 * @author Ryan Parman
38 * @author Sam Sneddon
39 * @author Ryan McCue
40 * @link http://simplepie.org/ SimplePie
41 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
42 */
43
44/**
45 * Used to create cache objects
46 *
47 * This class can be overloaded with {@see SimplePie::set_cache_class()},
48 * although the preferred way is to create your own handler
49 * via {@see register()}
50 *
51 * @package SimplePie
52 * @subpackage Caching
53 */
54class SimplePie_Cache
55{
56	/**
57	 * Cache handler classes
58	 *
59	 * These receive 3 parameters to their constructor, as documented in
60	 * {@see register()}
61	 * @var array
62	 */
63	protected static $handlers = array(
64		'mysql'     => 'SimplePie_Cache_MySQL',
65		'memcache'  => 'SimplePie_Cache_Memcache',
66		'memcached' => 'SimplePie_Cache_Memcached',
67		'redis'     => 'SimplePie_Cache_Redis'
68	);
69
70	/**
71	 * Don't call the constructor. Please.
72	 */
73	private function __construct() { }
74
75	/**
76	 * Create a new SimplePie_Cache object
77	 *
78	 * @param string $location URL location (scheme is used to determine handler)
79	 * @param string $filename Unique identifier for cache object
80	 * @param string $extension 'spi' or 'spc'
81	 * @return SimplePie_Cache_Base Type of object depends on scheme of `$location`
82	 */
83	public static function get_handler($location, $filename, $extension)
84	{
85		$type = explode(':', $location, 2);
86		$type = $type[0];
87		if (!empty(self::$handlers[$type]))
88		{
89			$class = self::$handlers[$type];
90			return new $class($location, $filename, $extension);
91		}
92
93		return new SimplePie_Cache_File($location, $filename, $extension);
94	}
95
96	/**
97	 * Create a new SimplePie_Cache object
98	 *
99	 * @deprecated Use {@see get_handler} instead
100	 */
101	public function create($location, $filename, $extension)
102	{
103		trigger_error('Cache::create() has been replaced with Cache::get_handler(). Switch to the registry system to use this.', E_USER_DEPRECATED);
104		return self::get_handler($location, $filename, $extension);
105	}
106
107	/**
108	 * Register a handler
109	 *
110	 * @param string $type DSN type to register for
111	 * @param string $class Name of handler class. Must implement SimplePie_Cache_Base
112	 */
113	public static function register($type, $class)
114	{
115		self::$handlers[$type] = $class;
116	}
117
118	/**
119	 * Parse a URL into an array
120	 *
121	 * @param string $url
122	 * @return array
123	 */
124	public static function parse_URL($url)
125	{
126		$params = parse_url($url);
127		$params['extras'] = array();
128		if (isset($params['query']))
129		{
130			parse_str($params['query'], $params['extras']);
131		}
132		return $params;
133	}
134}
135