1 // Copyright (c) 2011 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 "chrome/browser/sync/syncable/syncable_id.h" 6 7 #include <iosfwd> 8 9 #include "base/string_util.h" 10 #include "base/values.h" 11 12 using std::ostream; 13 using std::string; 14 15 namespace syncable { 16 const Id kNullId; // Currently == root. 17 18 ostream& operator<<(ostream& out, const Id& id) { 19 out << id.s_; 20 return out; 21 } 22 23 StringValue* Id::ToValue() const { 24 return Value::CreateStringValue(s_); 25 } 26 27 string Id::GetServerId() const { 28 // Currently root is the string "0". We need to decide on a true value. 29 // "" would be convenient here, as the IsRoot call would not be needed. 30 if (IsRoot()) 31 return "0"; 32 return s_.substr(1); 33 } 34 35 Id Id::CreateFromServerId(const string& server_id) { 36 Id id; 37 if (server_id == "0") 38 id.s_ = "r"; 39 else 40 id.s_ = string("s") + server_id; 41 return id; 42 } 43 44 Id Id::CreateFromClientString(const string& local_id) { 45 Id id; 46 if (local_id == "0") 47 id.s_ = "r"; 48 else 49 id.s_ = string("c") + local_id; 50 return id; 51 } 52 53 Id Id::GetLexicographicSuccessor() const { 54 // The successor of a string is given by appending the least 55 // character in the alphabet. 56 Id id = *this; 57 id.s_.push_back(0); 58 return id; 59 } 60 61 // static 62 Id Id::GetLeastIdForLexicographicComparison() { 63 Id id; 64 id.s_.clear(); 65 return id; 66 } 67 68 } // namespace syncable 69
