From f4923ada9741e2f7ee747de482b69260cd4c1b55 Mon Sep 17 00:00:00 2001
From: Dmitry Avdeev <Dmitry.Avdeev@jetbrains.com>
Date: Wed, 22 Aug 2012 14:42:35 +0400
Subject: [PATCH] IDEA-90141 ClassCastException when using an xml based
 template (in a template dir) in a Django project.

---
 xml/impl/src/com/intellij/xml/index/XmlNamespaceIndex.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xml/impl/src/com/intellij/xml/index/XmlNamespaceIndex.java b/xml/impl/src/com/intellij/xml/index/XmlNamespaceIndex.java
index 5a4b2a8bf513..6d681d5d32ff 100644
--- a/xml/impl/src/com/intellij/xml/index/XmlNamespaceIndex.java
+++ b/xml/impl/src/com/intellij/xml/index/XmlNamespaceIndex.java
@@ -160,7 +160,9 @@ public class XmlNamespaceIndex extends XmlIndex<XsdNamespaceBuilder> {
 
     IndexedRelevantResource<String,XsdNamespaceBuilder> resource =
       guessSchema(namespace, tagName, version, ModuleUtilCore.findModuleForPsiElement(file));
-    return resource == null ? null : (XmlFile)file.getManager().findFile(resource.getFile());
+    if (resource == null) return null;
+    PsiFile psiFile = file.getManager().findFile(resource.getFile());
+    return psiFile instanceof XmlFile ? (XmlFile)psiFile : null;
   }
 
   @Nullable