[1.7.0] Add DefinitionCache decorators, implement Memory decorator

- Move serialization responsibility to Config
- Create DefinitionCacheFactory
- Implement Null definition cache

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1117 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/DefinitionCache/Decorator.php

@@ -0,0 +1,62 @@
+<?php
+
+require_once 'HTMLPurifier/DefinitionCache.php';
+
+require_once 'HTMLPurifier/DefinitionCache/Decorator/Memory.php';
+
+class HTMLPurifier_DefinitionCache_Decorator extends HTMLPurifier_DefinitionCache
+{
+    
+    /**
+     * Cache object we are decorating
+     */
+    var $cache;
+    
+    function HTMLPurifier_DefinitionCache_Decorator() {}
+    
+    /**
+     * Lazy decorator function
+     * @param $cache Reference to cache object to decorate
+     */
+    function decorate(&$cache) {
+        $decorator = $this->copy();
+        // reference is necessary for mocks in PHP 4
+        $decorator->cache =& $cache;
+        $decorator->type  = $cache->type;
+        return $decorator;
+    }
+    
+    /**
+     * Cross-compatible clone substitute
+     */
+    function copy() {
+        return new HTMLPurifier_DefinitionCache_Decorator();
+    }
+    
+    function add($def, $config) {
+        return $this->cache->add($def, $config);
+    }
+    
+    function set($def, $config) {
+        return $this->cache->set($def, $config);
+    }
+    
+    function replace($def, $config) {
+        return $this->cache->replace($def, $config);
+    }
+    
+    function get($config) {
+        return $this->cache->get($config);
+    }
+    
+    function flush() {
+        return $this->cache->flush();
+    }
+    
+    function cleanup($config) {
+        return $this->cache->cleanup($config);
+    }
+    
+}
+
+?>