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