From cdcf64cef147535d49e53b7af84b50afd66ff9c3 Mon Sep 17 00:00:00 2001
From: Ruslan Cheremin <ruslan.cheremin@jetbrains.com>
Date: Tue, 23 Dec 2025 15:21:47 +0100
Subject: [PATCH] [indexes] IJPL-225237: fix unsafe casting
 TransientVirtualFile to WithId

GitOrigin-RevId: 32509b84ffa7c17547226fd8d0a6be9da40aa1e7
---
 .../src/com/intellij/util/indexing/IdFilter.java            | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/platform/indexing-api/src/com/intellij/util/indexing/IdFilter.java b/platform/indexing-api/src/com/intellij/util/indexing/IdFilter.java
index c8e46ee74999..100cd5c0be2b 100644
--- a/platform/indexing-api/src/com/intellij/util/indexing/IdFilter.java
+++ b/platform/indexing-api/src/com/intellij/util/indexing/IdFilter.java
@@ -63,10 +63,12 @@ public abstract class IdFilter {
 
   private static @NotNull IdFilter buildProjectIdFilterForContentFiles(@NotNull Project project) {
     long started = System.currentTimeMillis();
-    final BitSet idSet = new BitSet();
+    BitSet idSet = new BitSet();
 
     ContentIterator iterator = fileOrDir -> {
-      idSet.set(((VirtualFileWithId)fileOrDir).getId());
+      if (fileOrDir instanceof VirtualFileWithId fileWithId) {
+        idSet.set(fileWithId.getId());
+      }//else: if file doesn't have id -- we don't bother adding it to IdFilter?
       ProgressManager.checkCanceled();
       return true;
     };