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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_ENGINE_BUILD_COMMIT_COMMAND_H_
#define CHROME_BROWSER_SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_
#pragma once
#include "base/basictypes.h"
#include "chrome/browser/sync/engine/syncer_command.h"
#include "chrome/browser/sync/engine/syncproto.h"
#include "chrome/browser/sync/syncable/syncable.h"
namespace browser_sync {
class BuildCommitCommand : public SyncerCommand {
public:
BuildCommitCommand();
virtual ~BuildCommitCommand();
// SyncerCommand implementation.
virtual void ExecuteImpl(sessions::SyncSession* session);
private:
FRIEND_TEST_ALL_PREFIXES(BuildCommitCommandTest, InterpolatePosition);
// Constants controlling range of values.
static const int64 kFirstPosition;
static const int64 kLastPosition;
static const int64 kGap;
void AddExtensionsActivityToMessage(sessions::SyncSession* session,
CommitMessage* message);
// Helper for computing position. Find the numeric position value
// of the closest already-synced entry. |direction| must be one of
// NEXT_ID or PREV_ID; this parameter controls the search direction.
// For an open range (no predecessor or successor), the return
// value will be kFirstPosition or kLastPosition.
int64 FindAnchorPosition(syncable::IdField direction,
const syncable::Entry& entry);
// Given two values of the type returned by FindAnchorPosition,
// compute a third value in between the two ranges.
int64 InterpolatePosition(int64 lo, int64 hi);
DISALLOW_COPY_AND_ASSIGN(BuildCommitCommand);
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_ENGINE_BUILD_COMMIT_COMMAND_H_
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