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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 "mongo/db/jsobj.h"
namespace mongo {
class IndexDetails;
class NamespaceDetails;
/**
* There has been some behavior concerning indexed access patterns -- both pre and post-index
* construction -- that does not quite fit in the access pattern model implemented in
* index/index_access_pattern.h. Such behavior can't be changed in the current implementation of
* the code.
*
* We grouped such exception/legacy behavior here.
*/
class IndexLegacy {
public:
/**
* Adjust the provided index spec BSONObj depending on the type of index obj describes.
*
* This is a no-op unless the object describes a FTS index. To see what FTS does, look in
* FTSSpec::fixSpec in fts/fts_spec.cpp.
*/
static BSONObj adjustIndexSpecObject(const BSONObj& obj);
/**
* Returns the BSONObj that is inserted into an index when the object is missing the keys
* the index is over.
*
* For every index *except hash*, this is the BSON equivalent of jstNULL.
* For the hash index, it's the hash of BSON("" << BSONNULL).
*
* s/d_split.cpp needs to know this.
*
* This is a significant leak of index functionality out of the index layer.
*/
static BSONObj getMissingField(const BSONObj& infoObj);
/**
* Perform any post-build steps for this index.
*
* This is a no-op unless the index is a FTS index. In that case, we set the flag for using
* power of 2 sizes for space allocation.
*/
static void postBuildHook(NamespaceDetails* tableToIndex, const IndexDetails& idx);
};
} // namespace mongo
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