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// Copyright (c) 2011 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_API_SYNC_CHANGE_H_
#define CHROME_BROWSER_SYNC_API_SYNC_CHANGE_H_
#pragma once
#include <string>
#include <vector>
#include "chrome/browser/sync/api/sync_data.h"
// A SyncChange object reflects a change to a piece of synced data. The change
// can be either a delete, add, or an update. All data relevant to the change
// is encapsulated within the SyncChange, which, once created, is immutable.
// Note: it is safe and cheap to pass these by value or make copies, as they do
// not create deep copies of their internal data.
class SyncChange {
public:
enum SyncChangeType {
ACTION_INVALID,
ACTION_ADD,
ACTION_UPDATE,
ACTION_DELETE
};
// Default constructor creates an invalid change.
SyncChange();
// Create a new change with the specified sync data.
SyncChange(SyncChangeType change_type, const SyncData& sync_data);
~SyncChange();
// Copy constructor and assignment operator welcome.
// Whether this change is valid. This must be true before attempting to access
// the data.
// Deletes: Requires valid tag when going to the syncer. Requires valid
// specifics when coming from the syncer.
// Adds, Updates: Require valid tag and specifics when going to the syncer.
// Require only valid specifics when coming from the syncer.
bool IsValid() const;
// Getters.
SyncChangeType change_type() const;
SyncData sync_data() const;
private:
SyncChangeType change_type_;
// An immutable container for the data of this SyncChange. Whenever
// SyncChanges are copied, they copy references to this data.
SyncData sync_data_;
};
#endif // CHROME_BROWSER_SYNC_API_SYNC_CHANGE_H_
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