(For-try) Divide recursive Copy/Move into multiple async tasks

webkit/fileapi/remove_operation_delegate.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WEBKIT_FILEAPI_REMOVE_OPERATION_DELEGATE_H_
+#define WEBKIT_FILEAPI_REMOVE_OPERATION_DELEGATE_H_
+
+#include <stack>
+
+#include "webkit/fileapi/recursive_operation_delegate.h"
+
+namespace fileapi {
+
+class RemoveOperationDelegate
+    : public RecursiveOperationDelegate,
+      public base::SupportsWeakPtr<RemoveOperationDelegate> {
+ public:
+  RemoveOperationDelegate(LocalFileSystemOperation* original_operation,
+                          const FileSystemURL& url,
+                          const StatusCallback& callback);
+  virtual ~RemoveOperationDelegate();
+
+  // RecursiveOperationDelegate overrides:
+  virtual void Run() OVERRIDE;
+  virtual void RunRecursively() OVERRIDE;
+  virtual void ProcessFile(const FileSystemURL& url,
+                           const StatusCallback& callback) OVERRIDE;
+  virtual void ProcessDirectory(const FileSystemURL& url,
+                                const StatusCallback& callback) OVERRIDE;
+
+  using base::SupportsWeakPtr<RemoveOperationDelegate>::AsWeakPtr;
+
+ private:
+  void DidTryRemoveFile(base::PlatformFileError error);
+  void DidRemoveFile(const StatusCallback& callback,
+                     base::PlatformFileError error);
+  void RemoveNextDirectory(base::PlatformFileError error);
+
+  FileSystemURL url_;
+  StatusCallback callback_;
+
+  std::stack<FileSystemURL> to_remove_directories_;
+
+  DISALLOW_COPY_AND_ASSIGN(RemoveOperationDelegate);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_REMOVE_OPERATION_DELEGATE_H_