Developer
<?php
/**
* Responsible for creating definition caches.
*/
class HTMLPurifier_DefinitionCacheFactory
{
/**
* @type array
*/
protected $caches = array('Serializer' => array());
/**
* @type array
*/
protected $implementations = array();
/**
* @type HTMLPurifier_DefinitionCache_Decorator[]
*/
protected $decorators = array();
/**
* Initialize default decorators
*/
public function setup()
{
$this->addDecorator('Cleanup');
}
/**
* Retrieves an instance of global definition cache factory.
* @param HTMLPurifier_DefinitionCacheFactory $prototype
* @return HTMLPurifier_DefinitionCacheFactory
*/
public static function instance($prototype = null)
{
static $instance;
if ($prototype !== null) {
$instance = $prototype;
} elseif ($instance === null || $prototype === true) {
$instance = new HTMLPurifier_DefinitionCacheFactory();
$instance->setup();
}
return $instance;
}
/**
* Registers a new definition cache object
* @param string $short Short name of cache object, for reference
* @param string $long Full class name of cache object, for construction
*/
public function register($short, $long)
{
$this->implementations[$short] = $long;
}
/**
* Factory method that creates a cache object based on configuration
* @param string $type Name of definitions handled by cache
* @param HTMLPurifier_Config $config Config instance
* @return mixed
*/
public function create($type, $config)
{
$method = $config->get('Cache.DefinitionImpl');
if ($method === null) {
return new HTMLPurifier_DefinitionCache_Null($type);
}
if (!empty($this->caches[$method][$type])) {
return $this->caches[$method][$type];
}
if (isset($this->implementations[$method]) &&
class_exists($class = $this->implementations[$method])) {
$cache = new $class($type);
} else {
if ($method != 'Serializer') {
trigger_error("Unrecognized DefinitionCache $method, using Serializer instead", E_USER_WARNING);
}
$cache = new HTMLPurifier_DefinitionCache_Serializer($type);
}
foreach ($this->decorators as $decorator) {
$new_cache = $decorator->decorate($cache);
// prevent infinite recursion in PHP 4
unset($cache);
$cache = $new_cache;
}
$this->caches[$method][$type] = $cache;
return $this->caches[$method][$type];
}
/**
* Registers a decorator to add to all new cache objects
* @param HTMLPurifier_DefinitionCache_Decorator|string $decorator An instance or the name of a decorator
*/
public function addDecorator($decorator)
{
if (is_string($decorator)) {
$class = "HTMLPurifier_DefinitionCache_Decorator_$decorator";
$decorator = new $class;
}
$this->decorators[$decorator->name] = $decorator;
}
}
// vim: et sw=4 sts=4
Developer
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