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preference_model_associator.h

// Copyright (c) 2009 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_SYNC_GLUE_PREFERENCE_MODEL_ASSOCIATOR_H_
#define CHROME_BROWSER_SYNC_GLUE_PREFERENCE_MODEL_ASSOCIATOR_H_

#include <map>
#include <set>
#include <string>

#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "chrome/browser/pref_service.h"
#include "chrome/browser/sync/glue/model_associator.h"
#include "chrome/browser/sync/unrecoverable_error_handler.h"

class ProfileSyncService;

namespace browser_sync {

class PreferenceChangeProcessor;

static const char kPreferencesTag[] = "google_chrome_preferences";

// Contains all model association related logic:
// * Algorithm to associate preferences model and sync model.
class PreferenceModelAssociator
    : public PerDataTypeAssociatorInterface<PrefService::Preference,
                                            std::wstring> {
 public:
  static syncable::ModelType model_type() { return syncable::PREFERENCES; }
  PreferenceModelAssociator(ProfileSyncService* sync_service,
                            UnrecoverableErrorHandler* error_handler);
  virtual ~PreferenceModelAssociator();

  // Returns the list of preference names that should be monitored for
  // changes.  Only preferences that are registered will be in this
  // list.
  const std::set<std::wstring>& synced_preferences() {
    return synced_preferences_;
  }

  // PerDataTypeAssociatorInterface implementation.
  //
  // Iterates through the sync model looking for matched pairs of items.
  virtual bool AssociateModels();

  // Clears all associations.
  virtual bool DisassociateModels();

  // Returns whether the sync model has nodes other than the permanent tagged
  // nodes.
  virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes);

  // Returns whether the preference model has any user-defined preferences.
  virtual bool ChromeModelHasUserCreatedNodes(bool* has_nodes);

  virtual void AbortAssociation() {
    // No implementation needed, this associator runs on the main
    // thread.
  }

  // Not implemented.
  virtual const PrefService::Preference* GetChromeNodeFromSyncId(
      int64 sync_id) {
    return NULL;
  }

  // Not implemented.
  virtual bool InitSyncNodeFromChromeId(std::wstring node_id,
                                        sync_api::BaseNode* sync_node) {
    return false;
  }

  // Returns the sync id for the given preference name, or sync_api::kInvalidId
  // if the preference name is not associated to any sync id.
  virtual int64 GetSyncIdFromChromeId(std::wstring node_id);

  // Associates the given preference name with the given sync id.
  virtual void Associate(const PrefService::Preference* node, int64 sync_id);

  // Remove the association that corresponds to the given sync id.
  virtual void Disassociate(int64 sync_id);

  // Returns whether a node with the given permanent tag was found and update
  // |sync_id| with that node's id.
  virtual bool GetSyncIdForTaggedNode(const std::string& tag, int64* sync_id);

 protected:
  // Returns sync service instance.
  ProfileSyncService* sync_service() { return sync_service_; }

 private:
  typedef std::map<std::wstring, int64> PreferenceNameToSyncIdMap;
  typedef std::map<int64, std::wstring> SyncIdToPreferenceNameMap;

  ProfileSyncService* sync_service_;
  UnrecoverableErrorHandler* error_handler_;
  std::set<std::wstring> synced_preferences_;
  int64 preferences_node_id_;

  PreferenceNameToSyncIdMap id_map_;
  SyncIdToPreferenceNameMap id_map_inverse_;

  DISALLOW_COPY_AND_ASSIGN(PreferenceModelAssociator);
};

}  // namespace browser_sync

#endif  // CHROME_BROWSER_SYNC_GLUE_PREFERENCE_MODEL_ASSOCIATOR_H_

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