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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.
//
// Utility functions manipulating syncable::Entries, intended for use by the
// syncer.
#ifndef SYNC_ENGINE_SYNCER_UTIL_H_
#define SYNC_ENGINE_SYNCER_UTIL_H_
#pragma once
#include <set>
#include <string>
#include <vector>
#include "sync/engine/syncer.h"
#include "sync/engine/syncer_types.h"
#include "sync/syncable/entry_kernel.h"
#include "sync/syncable/metahandle_set.h"
#include "sync/syncable/syncable_id.h"
namespace syncer {
class Cryptographer;
class SyncEntity;
// If the server sent down a client-tagged entry, or an entry whose
// commit response was lost, it is necessary to update a local entry
// with an ID that doesn't match the ID of the update. Here, we
// find the ID of such an entry, if it exists. This function may
// determine that |server_entry| should be dropped; if so, it returns
// the null ID -- callers must handle this case. When update application
// should proceed normally with a new local entry, this function will
// return server_entry.id(); the caller must create an entry with that
// ID. This function does not alter the database.
syncable::Id FindLocalIdToUpdate(
syncable::BaseTransaction* trans,
const SyncEntity& server_entry);
UpdateAttemptResponse AttemptToUpdateEntry(
syncable::WriteTransaction* const trans,
syncable::MutableEntry* const entry,
ConflictResolver* resolver,
Cryptographer* cryptographer);
// Pass in name to avoid redundant UTF8 conversion.
void UpdateServerFieldsFromUpdate(
syncable::MutableEntry* local_entry,
const SyncEntity& server_entry,
const std::string& name);
// Creates a new Entry iff no Entry exists with the given id.
void CreateNewEntry(syncable::WriteTransaction *trans,
const syncable::Id& id);
void SplitServerInformationIntoNewEntry(
syncable::WriteTransaction* trans,
syncable::MutableEntry* entry);
// This function is called on an entry when we can update the user-facing data
// from the server data.
void UpdateLocalDataFromServerData(syncable::WriteTransaction* trans,
syncable::MutableEntry* entry);
VerifyCommitResult ValidateCommitEntry(syncable::Entry* entry);
VerifyResult VerifyNewEntry(const SyncEntity& update,
syncable::Entry* target,
const bool deleted);
// Assumes we have an existing entry; check here for updates that break
// consistency rules.
VerifyResult VerifyUpdateConsistency(syncable::WriteTransaction* trans,
const SyncEntity& update,
syncable::MutableEntry* target,
const bool deleted,
const bool is_directory,
syncer::ModelType model_type);
// Assumes we have an existing entry; verify an update that seems to be
// expressing an 'undelete'
VerifyResult VerifyUndelete(syncable::WriteTransaction* trans,
const SyncEntity& update,
syncable::MutableEntry* target);
// Append |item|, followed by a chain of its predecessors selected by
// |inclusion_filter|, to the |commit_ids| vector and tag them as included by
// storing in the set |inserted_items|. |inclusion_filter| (typically one of
// IS_UNAPPLIED_UPDATE or IS_UNSYNCED) selects which type of predecessors to
// include. Returns true if |item| was added, and false if it was already in
// the list.
//
// Use AddPredecessorsThenItem instead of this method if you want the
// item to be the last, rather than first, item appended.
bool AddItemThenPredecessors(
syncable::BaseTransaction* trans,
syncable::Entry* item,
syncable::IndexedBitField inclusion_filter,
syncable::MetahandleSet* inserted_items,
std::vector<syncable::Id>* commit_ids);
// Exactly like AddItemThenPredecessors, except items are appended in the
// reverse (and generally more useful) order: a chain of predecessors from
// far to near, and finally the item.
void AddPredecessorsThenItem(
syncable::BaseTransaction* trans,
syncable::Entry* item,
syncable::IndexedBitField inclusion_filter,
syncable::MetahandleSet* inserted_items,
std::vector<syncable::Id>* commit_ids);
void MarkDeletedChildrenSynced(
syncable::Directory* dir,
std::set<syncable::Id>* deleted_folders);
} // namespace syncer
#endif // SYNC_ENGINE_SYNCER_UTIL_H_
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