Adding `browsing_data_filesystem_helper*` as the first step towards content settings UI.

chrome/browser/browsing_data_filesystem_helper.h

+// Copyright (c) 2011 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 CHROME_BROWSER_BROWSING_DATA_FILESYSTEM_HELPER_H_
+#define CHROME_BROWSER_BROWSING_DATA_FILESYSTEM_HELPER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/callback_old.h"
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+#include "base/time.h"
+#include "chrome/common/url_constants.h"
+#include "googleurl/src/gurl.h"
+
+#include "webkit/fileapi/file_system_types.h"
+
+class Profile;
+
+// BrowsingDataFilesystemHelper is an interface for classes dealing with
+// aggregating and deleting browsing data stored in local filesystems.  A
+// client of this class need to call StartFetching from the UI thread to
+// initiate the flow, and it'll be notified by the callback in its UI thread at
+// some later point.  The client must call CancelNotification() if it's
+// destroyed before the callback is notified.
+class BrowsingDataFilesystemHelper
+    : public base::RefCountedThreadSafe<BrowsingDataFilesystemHelper> {
+ public:
+  // Contains detailed information about a filesystem
+  struct FilesystemInfo {
+    FilesystemInfo(
+        const std::string& protocol,
+        const std::string& host,
+        const std::string& port,
+        const GURL& origin,
+        bool has_persistent,
+        bool has_temporary);
+    ~FilesystemInfo();
+
+    bool IsFileSchemeData() {
+      return protocol == chrome::kFileScheme;
+    }
+
+    std::string protocol;
+    std::string host;
+    std::string port;
+    GURL origin;
+    bool has_persistent;
+    bool has_temporary;
+    base::Time last_modified;
+  };
+
+  // Create a BrowsingDataFilesystemHelper instance for the filesystems
+  // stored in |profile|'s user data directory.
+  static BrowsingDataFilesystemHelper* Create(Profile* profile);
+
+  // Starts the fetching process, which will notify its completion via
+  // callback.
+  // This must be called only in the UI thread.
+  virtual void StartFetching(
+      Callback1<const std::vector<FilesystemInfo>& >::Type* callback) = 0;
+  // Cancels the notification callback (i.e., the window that created it no
+  // longer exists).
+  // This must be called only in the UI thread.
+  virtual void CancelNotification() = 0;
+  // Requests a single filesystem to be deleted in the FILE thread.
+  virtual void DeleteFilesystemOrigin(const GURL& origin) = 0;
+
+  virtual ~BrowsingDataFilesystemHelper() {}
+ protected:
+  friend class base::RefCountedThreadSafe<BrowsingDataFilesystemHelper>;
+};
+
+// This class is an implementation of BrowsingDataFilesystemHelper that does
+// not fetch its information from the filesystem tracker, but gets them
+// passed as a parameter.
+class CannedBrowsingDataFilesystemHelper
+    : public BrowsingDataFilesystemHelper {
+ public:
+  explicit CannedBrowsingDataFilesystemHelper(Profile* profile);
+
+  // Return a copy of the filesystem helper. Only one consumer can use the
+  // StartFetching method at a time, so we need to create a copy of the helper
+  // everytime we instantiate a cookies tree model for it.
+  CannedBrowsingDataFilesystemHelper* Clone();
+
+  // Add a filesystem to the set of canned filesystems that is
+  // returned by this helper.
+  void AddFilesystem(const GURL& origin,
+                     fileapi::FileSystemType type);
+
+  // Clear the list of canned filesystems.
+  void Reset();
+
+  // True if no filesystems are currently stored.
+  bool empty() const;
+
+  // BrowsingDataFilesystemHelper methods.
+  virtual void StartFetching(
+      Callback1<const std::vector<FilesystemInfo>& >::Type* callback);
+  virtual void CancelNotification() {}
+  virtual void DeleteFilesystemOrigin(const GURL& origin) {}
+
+ private:
+  struct PendingFilesystemInfo {
+    PendingFilesystemInfo();
+    PendingFilesystemInfo(const GURL& origin, fileapi::FileSystemType type);
+    ~PendingFilesystemInfo();
+
+    GURL origin;
+    fileapi::FileSystemType type;
+  };
+
+  virtual ~CannedBrowsingDataFilesystemHelper();
+
+  // Convert the pending filesystem info to filesystem info objects.
+  void ConvertPendingInfoInWebKitThread();
+
+  void NotifyInUIThread();
+
+  Profile* profile_;
+
+  // Lock to protect access to pending_filesystem_info_;
+  mutable base::Lock lock_;
+
+  // This may mutate on WEBKIT and UI threads.
+  std::vector<PendingFilesystemInfo> pending_filesystem_info_;
+
+  // This only mutates on the WEBKIT thread.
+  std::vector<FilesystemInfo> filesystem_info_;
+
+  // This only mutates on the UI thread.
+  scoped_ptr<Callback1<const std::vector<FilesystemInfo>& >::Type >
+      completion_callback_;
+
+  // Indicates whether or not we're currently fetching information:
+  // it's true when StartFetching() is called in the UI thread, and it's reset
+  // after we notified the callback in the UI thread.
+  // This only mutates on the UI thread.
+  bool is_fetching_;
+
+  DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataFilesystemHelper);
+};
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_FILESYSTEM_HELPER_H_