diff --git a/java/java-impl/src/com/intellij/codeInsight/generation/GenerateDelegateHandler.java b/java/java-impl/src/com/intellij/codeInsight/generation/GenerateDelegateHandler.java
index cf9de36ab727..af49fce9504a 100644
--- a/java/java-impl/src/com/intellij/codeInsight/generation/GenerateDelegateHandler.java
+++ b/java/java-impl/src/com/intellij/codeInsight/generation/GenerateDelegateHandler.java
@@ -32,7 +32,7 @@ public class GenerateDelegateHandler implements CodeInsightActionHandler {
   private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.generation.GenerateDelegateHandler");
 
   public void invoke(final Project project, final Editor editor, final PsiFile file) {
-    if (!file.isWritable() && !FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
+    if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
       return;
     }
     PsiDocumentManager.getInstance(project).commitAllDocuments();
diff --git a/java/java-impl/src/com/intellij/codeInsight/generation/GenerateMembersHandlerBase.java b/java/java-impl/src/com/intellij/codeInsight/generation/GenerateMembersHandlerBase.java
index 03c80e103e18..1a417f844b5f 100644
--- a/java/java-impl/src/com/intellij/codeInsight/generation/GenerateMembersHandlerBase.java
+++ b/java/java-impl/src/com/intellij/codeInsight/generation/GenerateMembersHandlerBase.java
@@ -44,7 +44,7 @@ public abstract class GenerateMembersHandlerBase implements CodeInsightActionHan
   }
 
   public final void invoke(final Project project, final Editor editor, PsiFile file) {
-    if (!file.isWritable() && !FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
+    if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
       return;
     }
     final PsiClass aClass = OverrideImplementUtil.getContextClass(project, editor, file, false);
diff --git a/java/java-impl/src/com/intellij/codeInsight/intention/impl/ImplementAbstractMethodHandler.java b/java/java-impl/src/com/intellij/codeInsight/intention/impl/ImplementAbstractMethodHandler.java
index 6a3daf4dcff4..7f3f1ffbccbe 100644
--- a/java/java-impl/src/com/intellij/codeInsight/intention/impl/ImplementAbstractMethodHandler.java
+++ b/java/java-impl/src/com/intellij/codeInsight/intention/impl/ImplementAbstractMethodHandler.java
@@ -100,7 +100,7 @@ public class ImplementAbstractMethodHandler {
 
   private void implementInClass(final PsiClass psiClass) {
     if (!psiClass.isValid()) return;
-    if (!psiClass.isWritable() && !FileDocumentManager.getInstance().requestWriting(PsiDocumentManager.getInstance(myProject).getDocument(psiClass.getContainingFile()), myProject)) {
+    if (!FileDocumentManager.getInstance().requestWriting(PsiDocumentManager.getInstance(myProject).getDocument(psiClass.getContainingFile()), myProject)) {
       MessagesEx.fileIsReadOnly(myProject, psiClass.getContainingFile().getVirtualFile()).showNow();
       return;
     }
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/CodeInsightUtilBase.java b/platform/lang-impl/src/com/intellij/codeInsight/CodeInsightUtilBase.java
index fc6f4b123ebd..b1f9195567ef 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/CodeInsightUtilBase.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/CodeInsightUtilBase.java
@@ -73,13 +73,14 @@ public class CodeInsightUtilBase {
   public static boolean prepareFileForWrite(final PsiFile file) {
     if (file == null) return false;
 
-    if (!file.isWritable()) {
-      final Project project = file.getProject();
+    final Project project = file.getProject();
+    final Document document = PsiDocumentManager.getInstance(project).getDocument(file);
+
+    if (!ReadonlyStatusHandler.getInstance(project).isWriteAccessAllowed(file.getVirtualFile())) {
 
       final Editor editor =
         FileEditorManager.getInstance(project).openTextEditor(new OpenFileDescriptor(project, file.getVirtualFile()), true);
 
-      final Document document = PsiDocumentManager.getInstance(project).getDocument(file);
       if (!FileDocumentManager.getInstance().requestWriting(document, project)) {
         ApplicationManager.getApplication().invokeLater(new Runnable() {
           public void run() {
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/actions/AbstractLayoutCodeProcessor.java b/platform/lang-impl/src/com/intellij/codeInsight/actions/AbstractLayoutCodeProcessor.java
index 415185be4ecc..01d0b8e9e4c0 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/actions/AbstractLayoutCodeProcessor.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/actions/AbstractLayoutCodeProcessor.java
@@ -133,7 +133,6 @@ public abstract class AbstractLayoutCodeProcessor {
       return;
     }
 
-    if (!file.isWritable()){
       if (!FileDocumentManager.getInstance().requestWriting(document, myProject)) {
         Messages.showMessageDialog(myProject, PsiBundle.message("cannot.modify.a.read.only.file", file.getName()),
         CodeInsightBundle.message("error.dialog.readonly.file.title"),
@@ -141,7 +140,6 @@ public abstract class AbstractLayoutCodeProcessor {
       );
       return;
       }
-    }
 
     final Runnable[] resultRunnable = new Runnable[1];
     Runnable readAction = new Runnable() {
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/completion/CodeCompletionHandlerBase.java b/platform/lang-impl/src/com/intellij/codeInsight/completion/CodeCompletionHandlerBase.java
index 16d50ca19059..60d3870aaf9a 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/completion/CodeCompletionHandlerBase.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/completion/CodeCompletionHandlerBase.java
@@ -81,7 +81,7 @@ public class CodeCompletionHandlerBase implements CodeInsightActionHandler {
       document.fireReadOnlyModificationAttempt();
       return;
     }
-    if (!psiFile.isWritable() && !FileDocumentManager.getInstance().requestWriting(document, project)) {
+    if (!FileDocumentManager.getInstance().requestWriting(document, project)) {
       return;
     }
 
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/editorActions/EmacsStyleIndentAction.java b/platform/lang-impl/src/com/intellij/codeInsight/editorActions/EmacsStyleIndentAction.java
index 92faea546928..3f65c03e1e1b 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/editorActions/EmacsStyleIndentAction.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/editorActions/EmacsStyleIndentAction.java
@@ -36,7 +36,7 @@ public class EmacsStyleIndentAction extends BaseCodeInsightAction implements Dum
     public void invoke(final Project project, final Editor editor, final PsiFile file) {
       PsiDocumentManager.getInstance(project).commitAllDocuments();
 
-      if (!file.isWritable() && !FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
+      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
         return;
       }
 
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java
index 53708aa13a29..9a9b429c291c 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java
@@ -49,11 +49,9 @@ public class PasteHandler extends EditorActionHandler {
   public void execute(final Editor editor, final DataContext dataContext) {
     if (editor.isViewer()) return;
 
-    if (!editor.getDocument().isWritable()) {
       if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), PlatformDataKeys.PROJECT.getData(dataContext))){
         return;
       }
-    }
 
     final Project project = editor.getProject();
     if (project == null || editor.isColumnMode()) {
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/generation/AutoIndentLinesHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/generation/AutoIndentLinesHandler.java
index 89147bfb177b..5eeefe801073 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/generation/AutoIndentLinesHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/generation/AutoIndentLinesHandler.java
@@ -17,11 +17,9 @@ public class AutoIndentLinesHandler implements CodeInsightActionHandler {
   public void invoke(Project project, Editor editor, PsiFile file) {
     PsiDocumentManager.getInstance(project).commitAllDocuments();
 
-    if (!file.isWritable()){
       if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
         return;
       }
-    }
 
     Document document = editor.getDocument();
     int startOffset, endOffset;
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByBlockCommentHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByBlockCommentHandler.java
index ad2c96cf6ac5..ec1a10ab2e12 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByBlockCommentHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByBlockCommentHandler.java
@@ -45,10 +45,8 @@ public class CommentByBlockCommentHandler implements CodeInsightActionHandler {
 
     myDocument = editor.getDocument();
 
-    if (!myFile.isWritable()) {
-      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
-        return;
-      }
+    if (!FileDocumentManager.getInstance().requestWriting(myDocument, project)) {
+      return;
     }
     FeatureUsageTracker.getInstance().triggerFeatureUsed("codeassists.comment.block");
     final Commenter commenter = findCommenter(myFile, myEditor);
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByLineCommentHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByLineCommentHandler.java
index d642c1acdbf9..5d8cee5afba2 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByLineCommentHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/generation/CommentByLineCommentHandler.java
@@ -48,10 +48,8 @@ public class CommentByLineCommentHandler implements CodeInsightActionHandler {
     myDocument = editor.getDocument();
     myEditor = editor;
 
-    if (!myFile.isWritable()) {
-      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)) {
-        return;
-      }
+    if (!FileDocumentManager.getInstance().requestWriting(myDocument, project)) {
+      return;
     }
 
     PsiDocumentManager.getInstance(project).commitDocument(myDocument);
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/generation/ImplementMethodsHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/generation/ImplementMethodsHandler.java
index 5a6f024db2e0..f80473d61859 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/generation/ImplementMethodsHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/generation/ImplementMethodsHandler.java
@@ -12,10 +12,8 @@ import com.intellij.psi.util.PsiUtilBase;
 
 public class ImplementMethodsHandler implements CodeInsightActionHandler{
   public final void invoke(final Project project, final Editor editor, PsiFile file) {
-    if (!file.isWritable()){
-      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
-        return;
-      }
+    if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
+      return;
     }
 
     Language language = PsiUtilBase.getLanguageAtOffset(file, editor.getCaretModel().getOffset());
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/generation/OverrideMethodsHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/generation/OverrideMethodsHandler.java
index a41e4c2841c1..6fe114e99045 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/generation/OverrideMethodsHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/generation/OverrideMethodsHandler.java
@@ -12,10 +12,8 @@ import com.intellij.psi.util.PsiUtilBase;
 
 public class OverrideMethodsHandler implements CodeInsightActionHandler{
   public final void invoke(final Project project, final Editor editor, PsiFile file) {
-    if (!file.isWritable()){
-      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
-        return;
-      }
+    if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
+      return;
     }
 
     Language language = PsiUtilBase.getLanguageAtOffset(file, editor.getCaretModel().getOffset());
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/generation/surroundWith/SurroundWithHandler.java b/platform/lang-impl/src/com/intellij/codeInsight/generation/surroundWith/SurroundWithHandler.java
index b0e4a1e05c5d..665fd2c817e4 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/generation/surroundWith/SurroundWithHandler.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/generation/surroundWith/SurroundWithHandler.java
@@ -88,10 +88,8 @@ public class SurroundWithHandler implements CodeInsightActionHandler{
 
   static void doSurround(final Project project, final Editor editor, final Surrounder surrounder, final PsiElement[] elements) {
     final PsiFile file = PsiDocumentManager.getInstance(project).getPsiFile(editor.getDocument());
-    if (!file.isWritable()){
-      if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
-        return;
-      }
+    if (!FileDocumentManager.getInstance().requestWriting(editor.getDocument(), project)){
+      return;
     }
 
     try {
diff --git a/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java b/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java
index 9d6946e8f63e..ed33c1f07c05 100644
--- a/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java
+++ b/platform/platform-api/src/com/intellij/openapi/fileEditor/FileDocumentManager.java
@@ -61,11 +61,18 @@ public abstract class FileDocumentManager {
   public abstract String getLineSeparator(@Nullable VirtualFile file, @Nullable Project project);
 
   /**
-   * Requests writing access on given document
+   * @return true if writing access allowed
+   * @see #requestWriting(com.intellij.openapi.editor.Document, com.intellij.openapi.project.Project)
+   */
+  public abstract boolean isWritingAllowed(@NotNull Document document, Project project);
+
+  /**
+   * Requests writing access on given document, possibly involving interaction with user.
    *
    * @param document document
    * @param project project 
    * @return true if writing access allowed
+   * @see com.intellij.openapi.vfs.ReadonlyStatusHandler#ensureFilesWritable(com.intellij.openapi.project.Project, com.intellij.openapi.vfs.VirtualFile...)
    */
   public abstract boolean requestWriting(@NotNull Document document, Project project);
 
diff --git a/platform/platform-api/src/com/intellij/openapi/vfs/ReadonlyStatusHandler.java b/platform/platform-api/src/com/intellij/openapi/vfs/ReadonlyStatusHandler.java
index 841fe3a1c8a1..007672065f03 100644
--- a/platform/platform-api/src/com/intellij/openapi/vfs/ReadonlyStatusHandler.java
+++ b/platform/platform-api/src/com/intellij/openapi/vfs/ReadonlyStatusHandler.java
@@ -18,15 +18,14 @@ package com.intellij.openapi.vfs;
 import com.intellij.CommonBundle;
 import com.intellij.openapi.components.ServiceManager;
 import com.intellij.openapi.project.Project;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.Collection;
 
 public abstract class ReadonlyStatusHandler {
 
-  public static class UnsuccessfulOperation extends Exception {
-    public UnsuccessfulOperation(String message) {
-      super(message);
-    }
+  public static boolean ensureFilesWritable(Project project, @NotNull VirtualFile... files) {
+    return getInstance(project).ensureFilesWritable(files).hasReadonlyFiles();
   }
 
   public static class OperationStatus {
@@ -75,6 +74,8 @@ public abstract class ReadonlyStatusHandler {
 
   public abstract OperationStatus ensureFilesWritable(VirtualFile... files);
 
+  public abstract boolean isWriteAccessAllowed(VirtualFile... files);
+
   public OperationStatus ensureFilesWritable(final Collection<VirtualFile> files) {
     return ensureFilesWritable(files.toArray(new VirtualFile[files.size()]));
   }
diff --git a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java
index eaf290c5d590..bc8acc46204a 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileDocumentManagerImpl.java
@@ -300,16 +300,20 @@ public class FileDocumentManagerImpl extends FileDocumentManager implements Appl
     }
   }
 
+  @Override
+  public boolean isWritingAllowed(@NotNull Document document, Project project) {
+    return document.isWritable();
+  }
+
   @Override
   public boolean requestWriting(@NotNull Document document, Project project) {
-    if (document.isWritable()) {
+    if (isWritingAllowed(document, project)) {
       return true;
     }
     if (project != null) {
       final VirtualFile file = getInstance().getFile(document);
       if (file != null && file.isValid()) {
-        final ReadonlyStatusHandler.OperationStatus operationStatus = ReadonlyStatusHandler.getInstance(project).ensureFilesWritable(file);
-        return !operationStatus.hasReadonlyFiles();
+        return ReadonlyStatusHandler.ensureFilesWritable(project, file);
       }
     }
     document.fireReadOnlyModificationAttempt();
diff --git a/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/ReadonlyStatusHandlerImpl.java b/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/ReadonlyStatusHandlerImpl.java
index 48752934b5cc..efe19f26b243 100644
--- a/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/ReadonlyStatusHandlerImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/ReadonlyStatusHandlerImpl.java
@@ -120,6 +120,16 @@ public class ReadonlyStatusHandlerImpl extends ReadonlyStatusHandler implements
     return createResultStatus(files, modificationStamps);
   }
 
+  @Override
+  public boolean isWriteAccessAllowed(VirtualFile... files) {
+    for (VirtualFile file : files) {
+      if (!file.isWritable()) {
+        return false;
+      }
+    }
+    return true;
+  }
+
   private static OperationStatus createResultStatus(final VirtualFile[] files, final long[] modificationStamps) {
     List<VirtualFile> readOnlyFiles = new ArrayList<VirtualFile>();
     List<VirtualFile> updatedFiles = new ArrayList<VirtualFile>();
diff --git a/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/WritingAccessProvider.java b/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/WritingAccessProvider.java
new file mode 100644
index 000000000000..ac9db2112d14
--- /dev/null
+++ b/platform/platform-impl/src/com/intellij/openapi/vcs/readOnlyHandler/WritingAccessProvider.java
@@ -0,0 +1,19 @@
+package com.intellij.openapi.vcs.readOnlyHandler;
+
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.openapi.extensions.ExtensionPointName;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+
+/**
+ * @author Dmitry Avdeev
+ */
+public interface WritingAccessProvider {
+
+  ExtensionPointName<WritingAccessProvider> EP_NAME = ExtensionPointName.create("com.intellij.writingAccessProvider");
+  
+  boolean isWritingAllowed(@NotNull VirtualFile file);
+
+  boolean requestWriting(Collection<VirtualFile> files);
+}
diff --git a/platform/platform-resources/src/META-INF/PlatformExtensionPoints.xml b/platform/platform-resources/src/META-INF/PlatformExtensionPoints.xml
index 0413b84c8824..40efbc985958 100644
--- a/platform/platform-resources/src/META-INF/PlatformExtensionPoints.xml
+++ b/platform/platform-resources/src/META-INF/PlatformExtensionPoints.xml
@@ -97,4 +97,6 @@
   <extensionPoint name="statusBarComponent" interface="com.intellij.openapi.wm.StatusBarCustomComponentFactory"/>
 
   <extensionPoint name="checkinHandlerFactory" interface="com.intellij.openapi.vcs.checkin.CheckinHandlerFactory"/>
+
+  <extensionPoint name="writingAccessProvider" area="IDEA_PROJECT" interface="com.intellij.openapi.vcs.readOnlyHandler.WritingAccessProvider"/>
 </extensionPoints>
diff --git a/plugins/properties/src/com/intellij/lang/properties/editor/ResourceBundleEditor.java b/plugins/properties/src/com/intellij/lang/properties/editor/ResourceBundleEditor.java
index ad4f4cdf55ce..ba166c56a9c8 100644
--- a/plugins/properties/src/com/intellij/lang/properties/editor/ResourceBundleEditor.java
+++ b/plugins/properties/src/com/intellij/lang/properties/editor/ResourceBundleEditor.java
@@ -421,8 +421,7 @@ public class ResourceBundleEditor extends UserDataHolderBase implements FileEdit
                 Document propertiesFileDocument = documentManager.getDocument(propertiesFile);
                 documentManager.commitDocument(propertiesFileDocument);
 
-                if (!propertiesFile.isWritable() &&
-                    !FileDocumentManager.getInstance().requestWriting(document, project)) {
+                if (!FileDocumentManager.getInstance().requestWriting(document, project)) {
                   uninstallDocumentListeners();
                   try {
                     document.replaceString(0, document.getTextLength(), oldText);