[3.1.0] Create decorator validator/adapter for Interchange.

- Output flush output

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1587 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigSchema/InterchangeValidator.php

@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * Decorator for interchange that performs validations
+ */
+class HTMLPurifier_ConfigSchema_InterchangeValidator
+{
+    protected $interchange;
+    protected $validators = array();
+    
+    /**
+     * @param $interchange Instance of HTMLPurifier_ConfigSchema_Interchange
+     *      to save changes to.
+     */
+    public function __construct($interchange) {
+        $this->interchange = $interchange;
+    }
+    
+    /**
+     * Registers a HTMLPurifier_ConfigSchema_Validator to run when adding.
+     */
+    public function addValidator($validator) {
+        $this->validators[] = $validator;
+    }
+    
+    /**
+     * Validates and adds a namespace hash
+     */
+    public function addNamespace($hash) {
+        foreach ($this->validators as $validator) {
+            $validator->validateNamespace($hash, $this->interchange);
+        }
+        $this->interchange->addNamespace($hash);
+    }
+    
+    /**
+     * Validates and adds a directive hash
+     */
+    public function addDirective($hash) {
+        foreach ($this->validators as $validator) {
+            $validator->validateDirective($hash, $this->interchange);
+        }
+        $this->interchange->addDirective($hash);
+    }
+}