From aae53042ca7dc1a8026855356f40ca3cabe49148 Mon Sep 17 00:00:00 2001
From: Eugene Zhuravlev <jeka@intellij.com>
Date: Thu, 8 Dec 2011 17:33:55 +0100
Subject: [PATCH] minor optimizations

---
 .../impl/src/com/intellij/compiler/impl/CompilerUtil.java | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/java/compiler/impl/src/com/intellij/compiler/impl/CompilerUtil.java b/java/compiler/impl/src/com/intellij/compiler/impl/CompilerUtil.java
index 6176e0fee201..a7637185dc21 100644
--- a/java/compiler/impl/src/com/intellij/compiler/impl/CompilerUtil.java
+++ b/java/compiler/impl/src/com/intellij/compiler/impl/CompilerUtil.java
@@ -102,7 +102,9 @@ public class CompilerUtil {
    * @param files
    */
   public static void refreshIOFiles(@NotNull final Collection<File> files) {
-    LocalFileSystem.getInstance().refreshIoFiles(files);
+    if (!files.isEmpty()) {
+      LocalFileSystem.getInstance().refreshIoFiles(files);
+    }
   }
 
   public static void refreshIODirectories(@NotNull final Collection<File> files) {
@@ -114,7 +116,9 @@ public class CompilerUtil {
         filesToRefresh.add(virtualFile);
       }
     }
-    RefreshQueue.getInstance().refresh(false, true, null, VfsUtil.toVirtualFileArray(filesToRefresh));
+    if (!filesToRefresh.isEmpty()) {
+      RefreshQueue.getInstance().refresh(false, true, null, VfsUtil.toVirtualFileArray(filesToRefresh));
+    }
   }
 
   public static void refreshIOFile(final File file) {