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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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/hasher.h"
#include "mongo/db/index/expression_keys_private.h"
#include "mongo/db/index/expression_params.h"
#include "mongo/db/index/hash_access_method.h"
namespace mongo {
HashAccessMethod::HashAccessMethod(IndexCatalogEntry* btreeState, SortedDataInterface* btree)
: IndexAccessMethod(btreeState, btree) {
const IndexDescriptor* descriptor = btreeState->descriptor();
// We can change these if the single-field limitation is lifted later.
uassert(16763,
"Currently only single field hashed index supported.",
1 == descriptor->getNumFields());
uassert(16764,
"Currently hashed indexes cannot guarantee uniqueness. Use a regular index.",
!descriptor->unique());
ExpressionParams::parseHashParams(descriptor->infoObj(), &_seed, &_hashVersion, &_hashedField);
}
void HashAccessMethod::getKeys(const BSONObj& obj, BSONObjSet* keys) const {
ExpressionKeysPrivate::getHashKeys(
obj, _hashedField, _seed, _hashVersion, _descriptor->isSparse(), keys);
}
} // namespace mongo
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