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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/2d_access_method.h"
#include <string>
#include <vector>
#include "mongo/db/geo/core.h"
#include "mongo/db/index_names.h"
#include "mongo/db/index/2d_common.h"
#include "mongo/db/index/expression_params.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/pdfile.h"
namespace mongo {
TwoDKeyGenerator::TwoDKeyGenerator( const TwoDIndexingParams& params )
: _params( params ) {
}
void TwoDKeyGenerator::getKeys(const BSONObj& obj, BSONObjSet* keys) const {
getKeys( obj, keys, NULL );
}
void TwoDKeyGenerator::getKeys(const BSONObj& obj,
BSONObjSet* keys,
std::vector<BSONObj>* locs ) const {
BSONElementMSet bSet;
// Get all the nested location fields, but don't return individual elements from
// the last array, if it exists.
obj.getFieldsDotted(_params.geo.c_str(), bSet, false);
if (bSet.empty())
return;
for (BSONElementMSet::iterator setI = bSet.begin(); setI != bSet.end(); ++setI) {
BSONElement geo = *setI;
if (geo.eoo() || !geo.isABSONObj())
continue;
//
// Grammar for location lookup:
// locs ::= [loc,loc,...,loc]|{<k>:loc,<k>:loc,...,<k>:loc}|loc
// loc ::= { <k1> : #, <k2> : # }|[#, #]|{}
//
// Empty locations are ignored, preserving single-location semantics
//
BSONObj embed = geo.embeddedObject();
if (embed.isEmpty())
continue;
// Differentiate between location arrays and locations
// by seeing if the first element value is a number
bool singleElement = embed.firstElement().isNumber();
BSONObjIterator oi(embed);
while (oi.more()) {
BSONObj locObj;
if (singleElement) {
locObj = embed;
} else {
BSONElement locElement = oi.next();
uassert(16804, mongoutils::str::stream() <<
"location object expected, location array not in correct format",
locElement.isABSONObj());
locObj = locElement.embeddedObject();
if(locObj.isEmpty())
continue;
}
BSONObjBuilder b(64);
// Remember the actual location object if needed
if (locs)
locs->push_back(locObj);
// Stop if we don't need to get anything but location objects
if (!keys) {
if (singleElement) break;
else continue;
}
_params.geoHashConverter->hash(locObj, &obj).appendToBuilder(&b, "");
// Go through all the other index keys
for (vector<pair<string, int> >::const_iterator i = _params.other.begin();
i != _params.other.end(); ++i) {
// Get *all* fields for the index key
BSONElementSet eSet;
obj.getFieldsDotted(i->first, eSet);
if (eSet.size() == 0)
b.appendNull("");
else if (eSet.size() == 1)
b.appendAs(*(eSet.begin()), "");
else {
// If we have more than one key, store as an array of the objects
BSONArrayBuilder aBuilder;
for (BSONElementSet::iterator ei = eSet.begin(); ei != eSet.end();
++ei) {
aBuilder.append(*ei);
}
b.append("", aBuilder.arr());
}
}
keys->insert(b.obj());
if(singleElement) break;
}
}
}
} // namespace mongo
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