import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/filehandle/MutableFileBase.h

@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_MutableFile_h
+#define mozilla_dom_MutableFile_h
+
+#include "mozilla/dom/FileHandleCommon.h"
+#include "nscore.h"
+
+template <class> struct already_AddRefed;
+class nsISupports;
+class nsString;
+struct PRThread;
+
+namespace mozilla {
+namespace dom {
+
+class BackgroundMutableFileChildBase;
+class BlobImpl;
+class File;
+class FileHandleBase;
+
+/**
+ * This class provides a base for MutableFile implementations.
+ * (for example IDBMutableFile provides IndexedDB specific implementation).
+ */
+class MutableFileBase
+  : public RefCountedThreadObject
+{
+protected:
+  BackgroundMutableFileChildBase* mBackgroundActor;
+
+public:
+  BackgroundMutableFileChildBase*
+  GetBackgroundActor() const
+  {
+    AssertIsOnOwningThread();
+
+    return mBackgroundActor;
+  }
+
+  void
+  ClearBackgroundActor()
+  {
+    AssertIsOnOwningThread();
+
+    mBackgroundActor = nullptr;
+  }
+
+  virtual const nsString&
+  Name() const = 0;
+
+  virtual const nsString&
+  Type() const = 0;
+
+  virtual bool
+  IsInvalidated() = 0;
+
+  virtual already_AddRefed<File>
+  CreateFileFor(BlobImpl* aBlobImpl,
+                FileHandleBase* aFileHandle) = 0;
+
+protected:
+  MutableFileBase(DEBUGONLY(PRThread* aOwningThread,)
+                  BackgroundMutableFileChildBase* aActor);
+
+  virtual ~MutableFileBase();
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_MutableFile_h