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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/>.
*/
#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/2d_index_cursor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/pdfile.h"
namespace mongo {
static double configValueWithDefault(IndexDescriptor *desc, const string& name, double def) {
BSONElement e = desc->getInfoElement(name);
if (e.isNumber()) { return e.numberDouble(); }
return def;
}
TwoDAccessMethod::TwoDAccessMethod(IndexDescriptor* descriptor)
: BtreeBasedAccessMethod(descriptor) {
BSONObjIterator i(descriptor->keyPattern());
while (i.more()) {
BSONElement e = i.next();
if (e.type() == String && IndexNames::GEO_2D == e.valuestr()) {
uassert(16800, "can't have 2 geo fields", _params.geo.size() == 0);
uassert(16801, "2d has to be first in index", _params.other.size() == 0);
_params.geo = e.fieldName();
} else {
int order = 1;
if (e.isNumber()) {
order = static_cast<int>(e.Number());
}
_params.other.push_back(make_pair(e.fieldName(), order));
}
}
uassert(16802, "no geo field specified", _params.geo.size());
double bits = configValueWithDefault(_descriptor, "bits", 26); // for lat/long, ~ 1ft
uassert(16803, "bits in geo index must be between 1 and 32", bits > 0 && bits <= 32);
GeoHashConverter::Parameters params;
params.bits = static_cast<unsigned>(bits);
params.max = configValueWithDefault(_descriptor, "max", 180.0);
params.min = configValueWithDefault(_descriptor, "min", -180.0);
double numBuckets = (1024 * 1024 * 1024 * 4.0);
params.scaling = numBuckets / (params.max - params.min);
_params.geoHashConverter.reset(new GeoHashConverter(params));
BSONObjBuilder b;
b.appendNull("");
_nullObj = b.obj();
_nullElt = _nullObj.firstElement();
}
/** Finds the key objects to put in an index */
void TwoDAccessMethod::getKeys(const BSONObj& obj, BSONObjSet* keys) {
getKeys(obj, keys, NULL);
}
/** Finds all locations in a geo-indexed object */
void TwoDAccessMethod::getKeys(const BSONObj& obj, vector<BSONObj>& locs) const {
getKeys(obj, NULL, &locs);
}
/** Finds the key objects and/or locations for a geo-indexed object */
void TwoDAccessMethod::getKeys(const BSONObj &obj, BSONObjSet* keys,
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;
GEODEBUG("Element " << geo << " found for query " << _geo.c_str());
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, 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.appendAs(_nullElt, "");
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;
}
}
}
Status TwoDAccessMethod::newCursor(IndexCursor** out) {
*out = new TwoDIndexCursor(this);
return Status::OK();
}
} // namespace mongo
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