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// 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.
#include "sync/syncable/syncable_id.h"
#include <iosfwd>
#include "base/values.h"
using std::ostream;
using std::string;
namespace syncer {
namespace syncable {
ostream& operator<<(ostream& out, const Id& id) {
out << id.s_;
return out;
}
base::StringValue* Id::ToValue() const {
return new base::StringValue(s_);
}
string Id::GetServerId() const {
// Currently root is the string "0". We need to decide on a true value.
// "" would be convenient here, as the IsRoot call would not be needed.
if (IsRoot())
return "0";
return s_.substr(1);
}
Id Id::CreateFromServerId(const string& server_id) {
Id id;
if (server_id == "0")
id.s_ = "r";
else
id.s_ = string("s") + server_id;
return id;
}
Id Id::CreateFromClientString(const string& local_id) {
Id id;
if (local_id == "0")
id.s_ = "r";
else
id.s_ = string("c") + local_id;
return id;
}
Id Id::GetLexicographicSuccessor() const {
// The successor of a string is given by appending the least
// character in the alphabet.
Id id = *this;
id.s_.push_back(0);
return id;
}
// static
Id Id::GetLeastIdForLexicographicComparison() {
Id id;
id.s_.clear();
return id;
}
Id GetNullId() {
return Id(); // Currently == root.
}
} // namespace syncable
} // namespace syncer
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