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// 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_SYNCABLE_SYNCABLE_ID_H_
#define CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_ID_H_
#pragma once
#include <iosfwd>
#include <limits>
#include <sstream>
#include <string>
#include "base/hash_tables.h"
#include "chrome/browser/sync/util/fast_dump.h"
#include "chrome/browser/sync/util/sync_types.h"
extern "C" {
struct sqlite3;
struct sqlite3_stmt;
}
namespace syncable {
struct EntryKernel;
struct IdRowTraits;
class Id;
} // namespace syncable
class MockConnectionManager;
class SQLStatement;
std::ostream& operator << (std::ostream& out, const syncable::Id& id);
browser_sync::FastDump& operator <<
(browser_sync::FastDump& out, const syncable::Id& id);
namespace syncable {
// For historical reasons, 3 concepts got everloaded into the Id:
// 1. A unique, opaque identifier for the object.
// 2. Flag specifing whether server know about this object.
// 3. Flag for root.
//
// We originally wrapped an integer for this information, but now we use a
// string. It will have one of three forms:
// 1. c<client only opaque id> for client items that have not been committed.
// 2. r for the root item.
// 3. s<server provided opaque id> for items that the server knows about.
class Id {
friend int UnpackEntry(SQLStatement* statement,
syncable::EntryKernel** kernel);
friend struct syncable::IdRowTraits;
friend int BindFields(const EntryKernel& entry, SQLStatement* statement);
friend std::ostream& ::operator << (std::ostream& out,
const syncable::Id& id);
friend browser_sync::FastDump& ::operator <<
(browser_sync::FastDump& out, const syncable::Id& id);
friend class MockConnectionManager;
friend class SyncableIdTest;
public:
// This constructor will be handy even when we move away from int64s, just
// for unit tests.
inline Id() : s_("r") { }
inline Id(const Id& that) {
Copy(that);
}
inline Id& operator = (const Id& that) {
Copy(that);
return *this;
}
inline void Copy(const Id& that) {
this->s_ = that.s_;
}
inline bool IsRoot() const {
return "r" == s_;
}
inline bool ServerKnows() const {
return s_[0] == 's' || s_ == "r";
}
// TODO(sync): We could use null here, but to ease conversion we use "r".
// fix this, this is madness :)
inline bool IsNull() const {
return IsRoot();
}
inline void Clear() {
s_ = "r";
}
// Must never allow id == 0 or id < 0 to compile.
inline bool operator == (const Id& that) const {
return s_ == that.s_;
}
inline bool operator != (const Id& that) const {
return s_ != that.s_;
}
inline bool operator < (const Id& that) const {
return s_ < that.s_;
}
inline bool operator > (const Id& that) const {
return s_ > that.s_;
}
// Three functions are used to work with our proto buffers.
std::string GetServerId() const;
static Id CreateFromServerId(const std::string& server_id);
// This should only be used if you get back a reference to a local
// id from the server. Returns a client only opaque id.
static Id CreateFromClientString(const std::string& local_id);
protected:
std::string s_;
};
extern const Id kNullId;
} // namespace syncable
#endif // CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_ID_H_
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