Move the bits of Prefs where production code has only trivially easy

chrome/common/persistent_pref_store.h

-// Copyright (c) 2012 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_COMMON_PERSISTENT_PREF_STORE_H_
-#define CHROME_COMMON_PERSISTENT_PREF_STORE_H_
-
-#include <string>
-
-#include "chrome/common/pref_store.h"
-
-// This interface is complementary to the PrefStore interface, declaring
-// additional functionality that adds support for setting values and persisting
-// the data to some backing store.
-class PersistentPrefStore : public PrefStore {
- public:
-  // Unique integer code for each type of error so we can report them
-  // distinctly in a histogram.
-  // NOTE: Don't change the order here as it will change the server's meaning
-  // of the histogram.
-  enum PrefReadError {
-    PREF_READ_ERROR_NONE = 0,
-    PREF_READ_ERROR_JSON_PARSE,
-    PREF_READ_ERROR_JSON_TYPE,
-    PREF_READ_ERROR_ACCESS_DENIED,
-    PREF_READ_ERROR_FILE_OTHER,
-    PREF_READ_ERROR_FILE_LOCKED,
-    PREF_READ_ERROR_NO_FILE,
-    PREF_READ_ERROR_JSON_REPEAT,
-    PREF_READ_ERROR_OTHER,
-    PREF_READ_ERROR_FILE_NOT_SPECIFIED,
-    PREF_READ_ERROR_MAX_ENUM
-  };
-
-  class ReadErrorDelegate {
-   public:
-    virtual ~ReadErrorDelegate() {}
-
-    virtual void OnError(PrefReadError error) = 0;
-  };
-
-  // Equivalent to PrefStore::GetValue but returns a mutable value.
-  virtual ReadResult GetMutableValue(const std::string& key,
-                                     base::Value** result) = 0;
-
-  // Triggers a value changed notification. This function needs to be called
-  // if one retrieves a list or dictionary with GetMutableValue and change its
-  // value. SetValue takes care of notifications itself. Note that
-  // ReportValueChanged will trigger notifications even if nothing has changed.
-  virtual void ReportValueChanged(const std::string& key) = 0;
-
-  // Sets a |value| for |key| in the store. Assumes ownership of |value|, which
-  // must be non-NULL.
-  virtual void SetValue(const std::string& key, base::Value* value) = 0;
-
-  // Same as SetValue, but doesn't generate notifications. This is used by
-  // PrefService::GetMutableUserPref() in order to put empty entries
-  // into the user pref store. Using SetValue is not an option since existing
-  // tests rely on the number of notifications generated.
-  virtual void SetValueSilently(const std::string& key, base::Value* value) = 0;
-
-  // Removes the value for |key|.
-  virtual void RemoveValue(const std::string& key) = 0;
-
-  // Marks that the |key| with empty ListValue/DictionaryValue needs to be
-  // persisted.
-  virtual void MarkNeedsEmptyValue(const std::string& key) = 0;
-
-  // Whether the store is in a pseudo-read-only mode where changes are not
-  // actually persisted to disk.  This happens in some cases when there are
-  // read errors during startup.
-  virtual bool ReadOnly() const = 0;
-
-  // Gets the read error. Only valid if IsInitializationComplete() returns true.
-  virtual PrefReadError GetReadError() const = 0;
-
-  // Reads the preferences from disk. Notifies observers via
-  // "PrefStore::OnInitializationCompleted" when done.
-  virtual PrefReadError ReadPrefs() = 0;
-
-  // Reads the preferences from disk asynchronously. Notifies observers via
-  // "PrefStore::OnInitializationCompleted" when done. Also it fires
-  // |error_delegate| if it is not NULL and reading error has occurred.
-  // Owns |error_delegate|.
-  virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) = 0;
-
-  // Lands any pending writes to disk.
-  virtual void CommitPendingWrite() = 0;
-
- protected:
-  virtual ~PersistentPrefStore() {}
-};
-
-#endif  // CHROME_COMMON_PERSISTENT_PREF_STORE_H_