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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/index_legacy.h"
#include "mongo/db/client.h"
#include "mongo/db/fts/fts_spec.h"
#include "mongo/db/index/expression_keys_private.h"
#include "mongo/db/index/s2_access_method.h"
#include "mongo/db/index_names.h"
#include "mongo/db/jsobj.h"
namespace mongo {
// static
BSONObj IndexLegacy::adjustIndexSpecObject(const BSONObj& obj) {
string pluginName = IndexNames::findPluginName(obj.getObjectField("key"));
if (IndexNames::TEXT == pluginName) {
return fts::FTSSpec::fixSpec(obj);
}
if (IndexNames::GEO_2DSPHERE == pluginName) {
return S2AccessMethod::fixSpec(obj);
}
return obj;
}
// static
BSONObj IndexLegacy::getMissingField(OperationContext* txn,
Collection* collection,
const BSONObj& infoObj) {
BSONObj keyPattern = infoObj.getObjectField( "key" );
string accessMethodName;
if ( collection )
accessMethodName = collection->getIndexCatalog()->getAccessMethodName(txn, keyPattern);
else
accessMethodName = IndexNames::findPluginName(keyPattern);
if (IndexNames::HASHED == accessMethodName ) {
int hashVersion = infoObj["hashVersion"].numberInt();
HashSeed seed = infoObj["seed"].numberInt();
// Explicit null valued fields and missing fields are both represented in hashed indexes
// using the hash value of the null BSONElement. This is partly for historical reasons
// (hash of null was used in the initial release of hashed indexes and changing would
// alter the data format). Additionally, in certain places the hashed index code and
// the index bound calculation code assume null and missing are indexed identically.
BSONObj nullObj = BSON("" << BSONNULL);
return BSON("" << ExpressionKeysPrivate::makeSingleHashKey(nullObj.firstElement(), seed, hashVersion));
}
else {
BSONObjBuilder b;
b.appendNull("");
return b.obj();
}
}
} // namespace mongo
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