From cbaaacfba25d83d4c5bbb5a94858b622b238551f Mon Sep 17 00:00:00 2001
From: Alexey Kudravtsev <cdr@intellij.com>
Date: Mon, 29 Dec 2014 13:56:37 +0300
Subject: [PATCH] assertions

---
 .../intellij/openapi/fileEditor/impl/EditorComposite.java   | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/EditorComposite.java b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/EditorComposite.java
index bf523f26d03c..c4ea579a1b46 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/EditorComposite.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/EditorComposite.java
@@ -32,6 +32,7 @@ import com.intellij.openapi.fileEditor.ex.IdeDocumentHistory;
 import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.util.Comparing;
 import com.intellij.openapi.util.Disposer;
+import com.intellij.openapi.util.NullUtils;
 import com.intellij.openapi.util.Pair;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.wm.FocusWatcher;
@@ -50,10 +51,8 @@ import javax.swing.border.EmptyBorder;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
 import java.awt.*;
-import java.util.Collections;
-import java.util.HashMap;
+import java.util.*;
 import java.util.List;
-import java.util.Map;
 
 /**
  * This class hides internal structure of UI component which represent
@@ -106,6 +105,7 @@ public abstract class EditorComposite implements Disposable {
                   @NotNull final FileEditorManagerEx fileEditorManager) {
     myFile = file;
     myEditors = editors;
+    if (NullUtils.hasNull(editors)) throw new IllegalArgumentException("Must not pass null editors in " + Arrays.asList(editors));
     myFileEditorManager = fileEditorManager;
     myInitialFileTimeStamp     = myFile.getTimeStamp();