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/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vector>
#include "mongo/bson/ordering.h"
#include "mongo/db/diskloc.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/index/btree_interface.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/index/index_cursor.h"
#include "mongo/db/index/index_descriptor.h"
namespace mongo {
/**
* Any access method that is Btree based subclasses from this.
*
* Subclassers must:
* 1. Call the constructor for this class from their constructors,
* 2. override newCursor, and
* 3. override getKeys.
*/
class BtreeBasedAccessMethod : public IndexAccessMethod {
public:
BtreeBasedAccessMethod(IndexDescriptor *descriptor);
virtual ~BtreeBasedAccessMethod() { }
virtual Status insert(const BSONObj& obj,
const DiskLoc& loc,
const InsertDeleteOptions& options,
int64_t* numInserted);
virtual Status remove(const BSONObj& obj,
const DiskLoc& loc,
const InsertDeleteOptions& options,
int64_t* numDeleted);
virtual Status validateUpdate(const BSONObj& from,
const BSONObj& to,
const DiskLoc& loc,
const InsertDeleteOptions& options,
UpdateTicket* ticket);
virtual Status update(const UpdateTicket& ticket);
virtual Status newCursor(IndexCursor **out) = 0;
virtual Status touch(const BSONObj& obj);
protected:
// Friends who need getKeys.
// TODO: uncomment when builder is in.
// template <class K> friend class BtreeBasedIndexBuilder;
// See below for body.
class BtreeBasedPrivateUpdateData;
virtual void getKeys(const BSONObj &obj, BSONObjSet *keys) = 0;
IndexDescriptor* _descriptor;
Ordering _ordering;
// There are 2 types of Btree disk formats. We put them both behind one interface.
BtreeInterface* _interface;
private:
bool removeOneKey(const BSONObj& key, const DiskLoc& loc);
};
/**
* What data do we need to perform an update?
*/
class BtreeBasedAccessMethod::BtreeBasedPrivateUpdateData
: public UpdateTicket::PrivateUpdateData {
public:
virtual ~BtreeBasedPrivateUpdateData() { }
BSONObjSet oldKeys, newKeys;
// These point into the sets oldKeys and newKeys.
vector<BSONObj*> removed, added;
DiskLoc loc;
bool dupsAllowed;
};
} // namespace mongo
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