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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.
#ifndef SYNC_INTERNAL_API_READ_NODE_H_
#define SYNC_INTERNAL_API_READ_NODE_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "sync/internal_api/base_node.h"
#include "sync/internal_api/public/syncable/model_type.h"
namespace sync_api {
// 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);
virtual ~ReadNode();
// A client must use one (and only one) of the following Init variants to
// populate the node.
// BaseNode implementation.
virtual InitByLookupResult InitByIdLookup(int64 id) OVERRIDE;
virtual InitByLookupResult InitByClientTagLookup(
syncable::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();
// Each server-created permanent node is tagged with a unique string.
// Look up the node with the particular tag. If it does not exist,
// return false.
InitByLookupResult InitByTagLookup(const std::string& tag);
// Implementation of BaseNode's abstract virtual accessors.
virtual const syncable::Entry* GetEntry() const OVERRIDE;
virtual 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 sync_api
#endif // SYNC_INTERNAL_API_READ_NODE_H_
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