diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/changes/committed/ClearCommittedAction.kt b/platform/vcs-impl/src/com/intellij/openapi/vcs/changes/committed/ClearCommittedAction.kt
index efeae948ba7c..e9671ab57434 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/changes/committed/ClearCommittedAction.kt
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/changes/committed/ClearCommittedAction.kt
@@ -1,56 +1,34 @@
-/*
- * Copyright 2000-2012 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.intellij.openapi.vcs.changes.committed;
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.openapi.vcs.changes.committed
 
-import com.intellij.icons.AllIcons;
-import com.intellij.openapi.actionSystem.AnAction;
-import com.intellij.openapi.actionSystem.AnActionEvent;
-import com.intellij.openapi.actionSystem.CommonDataKeys;
-import com.intellij.openapi.actionSystem.PlatformDataKeys;
-import com.intellij.openapi.project.DumbAware;
-import com.intellij.openapi.project.Project;
-import com.intellij.openapi.vcs.RepositoryLocation;
-import com.intellij.openapi.vcs.changes.ui.ChangesViewContentManager;
+import com.intellij.icons.AllIcons
+import com.intellij.openapi.actionSystem.AnAction
+import com.intellij.openapi.actionSystem.AnActionEvent
+import com.intellij.openapi.actionSystem.CommonDataKeys
+import com.intellij.openapi.project.DumbAware
+import com.intellij.openapi.vcs.changes.ui.ChangesViewContentManager
 
-public class ClearCommittedAction extends AnAction implements DumbAware {
-  public ClearCommittedAction() {
-    super("Clear", "Clears cached revisions", AllIcons.Vcs.Remove);
-  }
-
-  public void actionPerformed(AnActionEvent e) {
-    Project project = e.getData(CommonDataKeys.PROJECT);
-    CommittedChangesPanel panel = ChangesViewContentManager.getInstance(project).getActiveComponent(CommittedChangesPanel.class);
-    assert panel != null;
-    if (panel.isInLoad()) return;
-    if (panel.getRepositoryLocation() == null) {
-      panel.clearCaches();
+class ClearCommittedAction : AnAction("Clear", "Clears cached revisions", AllIcons.Vcs.Remove), DumbAware {
+  override fun actionPerformed(e: AnActionEvent) {
+    val project = e.getData(CommonDataKeys.PROJECT)
+    val panel = ChangesViewContentManager.getInstance(project!!).getActiveComponent(CommittedChangesPanel::class.java)!!
+    if (panel.isInLoad) return
+    if (panel.repositoryLocation == null) {
+      panel.clearCaches()
     }
   }
 
-  public void update(final AnActionEvent e) {
-    Project project = e.getData(CommonDataKeys.PROJECT);
+  override fun update(e: AnActionEvent) {
+    val project = e.getData(CommonDataKeys.PROJECT)
     if (project != null) {
-      CommittedChangesPanel panel = ChangesViewContentManager.getInstance(project).getActiveComponent(CommittedChangesPanel.class);
-      RepositoryLocation rl = panel == null ? null : panel.getRepositoryLocation();
-      e.getPresentation().setVisible(rl == null);
-      e.getPresentation().setEnabled(panel != null && (! panel.isInLoad()));
+      val panel = ChangesViewContentManager.getInstance(project).getActiveComponent(CommittedChangesPanel::class.java)
+      val rl = panel?.repositoryLocation
+      e.presentation.isVisible = rl == null
+      e.presentation.isEnabled = panel != null && !panel.isInLoad
     }
     else {
-      e.getPresentation().setVisible(false);
-      e.getPresentation().setEnabled(false);
+      e.presentation.isVisible = false
+      e.presentation.isEnabled = false
     }
   }
 }