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// Copyright 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.
#ifndef COMPONENTS_SYNC_SYNCABLE_READ_NODE_H_
#define COMPONENTS_SYNC_SYNCABLE_READ_NODE_H_
#include <stddef.h>
#include <stdint.h>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "components/sync/base/model_type.h"
#include "components/sync/syncable/base_node.h"
namespace syncer {
// ReadNode wraps a syncable::Entry to provide the functionality of a
// read-only BaseNode.
class ReadNode : public BaseNode {
public:
// Create an unpopulated ReadNode on the given transaction. Call some flavor
// of Init to populate the ReadNode with a database entry.
explicit ReadNode(const BaseTransaction* transaction);
~ReadNode() override;
// A client must use one (and only one) of the following Init variants to
// populate the node.
// BaseNode implementation.
InitByLookupResult InitByIdLookup(int64_t id) override;
InitByLookupResult InitByClientTagLookup(ModelType model_type,
const std::string& tag) override;
// There is always a root node, so this can't fail. The root node is
// never mutable, so root lookup is only possible on a ReadNode.
void InitByRootLookup();
// Returns the type root node, if it exists. This is usually created by the
// server during first sync. Eventually, we plan to remove support for it
// from the protocol and have the client create the node instead.
InitByLookupResult InitTypeRoot(ModelType type);
// Returns a server-created and unique-server-tagged item.
//
// This functionality is only useful for bookmarks because only bookmarks
// have server-tagged items. All other server-tagged items are type root
// nodes, which should be looked up with InitTypeRoot().
InitByLookupResult InitByTagLookupForBookmarks(const std::string& tag);
// Returns transaction version of the last transaction where this node has
// been modified.
int64_t GetTransactionVersion() const;
// Implementation of BaseNode's abstract virtual accessors.
const syncable::Entry* GetEntry() const override;
const BaseTransaction* GetTransaction() const override;
protected:
ReadNode();
private:
void* operator new(size_t size); // Node is meant for stack use only.
// The underlying syncable object which this class wraps.
syncable::Entry* entry_;
// The sync API transaction that is the parent of this node.
const BaseTransaction* transaction_;
DISALLOW_COPY_AND_ASSIGN(ReadNode);
};
} // namespace syncer
#endif // COMPONENTS_SYNC_SYNCABLE_READ_NODE_H_
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