- Rename Duplicate to Unique, as the name of validator indicates what we want the input to be

- Enable flush to work when includes are renamed

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1597 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/ConfigSchema/Validator/Unique.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Validates that this ID does not exist already in the interchange object.
+ * @note
+ *      Although this tests both possible values, in practice the ID
+ *      will only be in one or the other. We do this to keep things simple.
+ */
+class HTMLPurifier_ConfigSchema_Validator_Unique extends HTMLPurifier_ConfigSchema_Validator
+{
+    
+    public function validate(&$arr, $interchange) {
+        if (isset($interchange->namespaces[$arr['ID']])) {
+            $this->error('Cannot redefine namespace');
+        }
+        if (isset($interchange->directives[$arr['ID']])) {
+            $this->error('Cannot redefine directive');
+        }
+    }
+    
+}