sync/syncable/syncable_id.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "sync/syncable/syncable_id.h"
   6
   7 #include <iosfwd>
   8
   9 #include "base/values.h"
  10
  11 using std::ostream;
  12 using std::string;
  13
  14 namespace syncer {
  15 namespace syncable {
  16
  17 ostream& operator<<(ostream& out, const Id& id) {
  18   out << id.s_;
  19   return out;
  20 }
  21
  22 base::StringValue* Id::ToValue() const {
  23   return new base::StringValue(s_);
  24 }
  25
  26 string Id::GetServerId() const {
  27   // Currently root is the string "0". We need to decide on a true value.
  28   // "" would be convenient here, as the IsRoot call would not be needed.
  29   if (IsRoot())
  30     return "0";
  31   return s_.substr(1);
  32 }
  33
  34 Id Id::CreateFromServerId(const string& server_id) {
  35   Id id;
  36   if (server_id == "0")
  37     id.s_ = "r";
  38   else
  39     id.s_ = string("s") + server_id;
  40   return id;
  41 }
  42
  43 Id Id::CreateFromClientString(const string& local_id) {
  44   Id id;
  45   if (local_id == "0")
  46     id.s_ = "r";
  47   else
  48     id.s_ = string("c") + local_id;
  49   return id;
  50 }
  51
  52 Id Id::GetLexicographicSuccessor() const {
  53   // The successor of a string is given by appending the least
  54   // character in the alphabet.
  55   Id id = *this;
  56   id.s_.push_back(0);
  57   return id;
  58 }
  59
  60 // static
  61 Id Id::GetLeastIdForLexicographicComparison() {
  62   Id id;
  63   id.s_.clear();
  64   return id;
  65 }
  66
  67 Id GetNullId() {
  68   return Id();  // Currently == root.
  69 }
  70
  71 }  // namespace syncable
  72 }  // namespace syncer