library/HTMLPurifier/DefinitionCacheFactory.php

   1 <?php
   2
   3 /**
   4  * Responsible for creating definition caches.
   5  */
   6 class HTMLPurifier_DefinitionCacheFactory
   7 {
   8
   9     protected $caches = array('Serializer' => array());
  10     protected $implementations = array();
  11     protected $decorators = array();
  12
  13     /**
  14      * Initialize default decorators
  15      */
  16     public function setup() {
  17         $this->addDecorator('Cleanup');
  18     }
  19
  20     /**
  21      * Retrieves an instance of global definition cache factory.
  22      */
  23     public static function instance($prototype = null) {
  24         static $instance;
  25         if ($prototype !== null) {
  26             $instance = $prototype;
  27         } elseif ($instance === null || $prototype === true) {
  28             $instance = new HTMLPurifier_DefinitionCacheFactory();
  29             $instance->setup();
  30         }
  31         return $instance;
  32     }
  33
  34     /**
  35      * Registers a new definition cache object
  36      * @param $short Short name of cache object, for reference
  37      * @param $long Full class name of cache object, for construction
  38      */
  39     public function register($short, $long) {
  40         $this->implementations[$short] = $long;
  41     }
  42
  43     /**
  44      * Factory method that creates a cache object based on configuration
  45      * @param $name Name of definitions handled by cache
  46      * @param $config Instance of HTMLPurifier_Config
  47      */
  48     public function create($type, $config) {
  49         $method = $config->get('Cache.DefinitionImpl');
  50         if ($method === null) {
  51             return new HTMLPurifier_DefinitionCache_Null($type);
  52         }
  53         if (!empty($this->caches[$method][$type])) {
  54             return $this->caches[$method][$type];
  55         }
  56         if (
  57           isset($this->implementations[$method]) &&
  58           class_exists($class = $this->implementations[$method], false)
  59         ) {
  60             $cache = new $class($type);
  61         } else {
  62             if ($method != 'Serializer') {
  63                 trigger_error("Unrecognized DefinitionCache $method, using Serializer instead", E_USER_WARNING);
  64             }
  65             $cache = new HTMLPurifier_DefinitionCache_Serializer($type);
  66         }
  67         foreach ($this->decorators as $decorator) {
  68             $new_cache = $decorator->decorate($cache);
  69             // prevent infinite recursion in PHP 4
  70             unset($cache);
  71             $cache = $new_cache;
  72         }
  73         $this->caches[$method][$type] = $cache;
  74         return $this->caches[$method][$type];
  75     }
  76
  77     /**
  78      * Registers a decorator to add to all new cache objects
  79      * @param
  80      */
  81     public function addDecorator($decorator) {
  82         if (is_string($decorator)) {
  83             $class = "HTMLPurifier_DefinitionCache_Decorator_$decorator";
  84             $decorator = new $class;
  85         }
  86         $this->decorators[$decorator->name] = $decorator;
  87     }
  88
  89 }
  90
  91 // vim: et sw=4 sts=4