/
2d.cpp
1840 lines (1476 loc) · 60.6 KB
/
2d.cpp
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// geo2d.cpp
/**
* Copyright (C) 2008 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 "pch.h"
#include "../namespace-inl.h"
#include "../jsobj.h"
#include "../index.h"
#include "../../util/unittest.h"
#include "../commands.h"
#include "../pdfile.h"
#include "../btree.h"
#include "../curop-inl.h"
#include "../matcher.h"
#include "core.h"
namespace mongo {
#if 0
# define GEODEBUG(x) cout << x << endl;
# define GEODEBUGPRINT(x) PRINT(x)
inline void PREFIXDEBUG(GeoHash prefix, const GeoConvert* g) {
if (!prefix.constrains()) {
cout << "\t empty prefix" << endl;
return ;
}
Point ll (g, prefix); // lower left
prefix.move(1,1);
Point tr (g, prefix); // top right
Point center ( (ll._x+tr._x)/2, (ll._y+tr._y)/2 );
double radius = fabs(ll._x - tr._x) / 2;
cout << "\t ll: " << ll.toString() << " tr: " << tr.toString()
<< " center: " << center.toString() << " radius: " << radius << endl;
}
#else
# define GEODEBUG(x)
# define GEODEBUGPRINT(x)
# define PREFIXDEBUG(x, y)
#endif
const double EARTH_RADIUS_KM = 6371;
const double EARTH_RADIUS_MILES = EARTH_RADIUS_KM * 0.621371192;
enum GeoDistType {
GEO_PLAIN,
GEO_SPHERE
};
inline double computeXScanDistance(double y, double maxDistDegrees) {
// TODO: this overestimates for large madDistDegrees far from the equator
return maxDistDegrees / min(cos(deg2rad(min(+89.0, y + maxDistDegrees))),
cos(deg2rad(max(-89.0, y - maxDistDegrees))));
}
GeoBitSets geoBitSets;
const string GEO2DNAME = "2d";
class Geo2dType : public IndexType , public GeoConvert {
public:
Geo2dType( const IndexPlugin * plugin , const IndexSpec* spec )
: IndexType( plugin , spec ) {
BSONObjBuilder orderBuilder;
BSONObjIterator i( spec->keyPattern );
while ( i.more() ) {
BSONElement e = i.next();
if ( e.type() == String && GEO2DNAME == e.valuestr() ) {
uassert( 13022 , "can't have 2 geo field" , _geo.size() == 0 );
uassert( 13023 , "2d has to be first in index" , _other.size() == 0 );
_geo = e.fieldName();
}
else {
_other.push_back( e.fieldName() );
}
orderBuilder.append( "" , 1 );
}
uassert( 13024 , "no geo field specified" , _geo.size() );
_bits = _configval( spec , "bits" , 26 ); // for lat/long, ~ 1ft
uassert( 13028 , "can't have more than 32 bits in geo index" , _bits <= 32 );
_max = _configval( spec , "max" , 180 );
_min = _configval( spec , "min" , -180 );
_scaling = (1024*1024*1024*4.0)/(_max-_min);
_order = orderBuilder.obj();
GeoHash a(0, 0, _bits);
GeoHash b = a;
b.move(1, 1);
_error = distance(a, b);
}
int _configval( const IndexSpec* spec , const string& name , int def ) {
BSONElement e = spec->info[name];
if ( e.isNumber() )
return e.numberInt();
return def;
}
~Geo2dType() {
}
virtual BSONObj fixKey( const BSONObj& in ) {
if ( in.firstElement().type() == BinData )
return in;
BSONObjBuilder b(in.objsize()+16);
if ( in.firstElement().isABSONObj() )
_hash( in.firstElement().embeddedObject() ).append( b , "" );
else if ( in.firstElement().type() == String )
GeoHash( in.firstElement().valuestr() ).append( b , "" );
else if ( in.firstElement().type() == RegEx )
GeoHash( in.firstElement().regex() ).append( b , "" );
else
return in;
BSONObjIterator i(in);
i.next();
while ( i.more() )
b.append( i.next() );
return b.obj();
}
virtual void getKeys( const BSONObj &obj, BSONObjSetDefaultOrder &keys ) const {
BSONElement geo = obj.getFieldDotted(_geo.c_str());
if ( geo.eoo() )
return;
BSONObjBuilder b(64);
if ( ! geo.isABSONObj() )
return;
BSONObj embed = geo.embeddedObject();
if ( embed.isEmpty() )
return;
_hash( embed ).append( b , "" );
// Go through all the other index keys
for ( vector<string>::const_iterator i = _other.begin(); i != _other.end(); ++i ){
// Get *all* fields for the index key
BSONElementSet eSet;
obj.getFieldsDotted( *i, eSet );
if ( eSet.size() == 0 )
b.appendAs( _spec->missingField(), "" );
else if ( eSet.size() == 1 )
b.appendAs( *(eSet.begin()), "" );
else{
// If we have more than one key, store as an array of the objects
// TODO: Store multiple keys?
BSONArrayBuilder aBuilder;
for( BSONElementSet::iterator ei = eSet.begin(); ei != eSet.end(); ++ei ){
aBuilder.append( *ei );
}
BSONArray arr = aBuilder.arr();
b.append( "", arr );
}
}
keys.insert( b.obj() );
}
GeoHash _tohash( const BSONElement& e ) const {
if ( e.isABSONObj() )
return _hash( e.embeddedObject() );
return GeoHash( e , _bits );
}
GeoHash _hash( const BSONObj& o ) const {
BSONObjIterator i(o);
uassert( 13067 , "geo field is empty" , i.more() );
BSONElement x = i.next();
uassert( 13068 , "geo field only has 1 element" , i.more() );
BSONElement y = i.next();
uassert( 13026 , "geo values have to be numbers: " + o.toString() , x.isNumber() && y.isNumber() );
return hash( x.number() , y.number() );
}
GeoHash hash( double x , double y ) const {
return GeoHash( _convert(x), _convert(y) , _bits );
}
BSONObj _unhash( const GeoHash& h ) const {
unsigned x , y;
h.unhash( x , y );
BSONObjBuilder b;
b.append( "x" , _unconvert( x ) );
b.append( "y" , _unconvert( y ) );
return b.obj();
}
unsigned _convert( double in ) const {
uassert( 13027 , "point not in range" , in <= (_max + _error) && in >= (_min - _error) );
in -= _min;
assert( in > 0 );
return (unsigned)(in * _scaling);
}
double _unconvert( unsigned in ) const {
double x = in;
x /= _scaling;
x += _min;
return x;
}
void unhash( const GeoHash& h , double& x , double& y ) const {
unsigned a,b;
h.unhash(a,b);
x = _unconvert( a );
y = _unconvert( b );
}
double distance( const GeoHash& a , const GeoHash& b ) const {
double ax,ay,bx,by;
unhash( a , ax , ay );
unhash( b , bx , by );
double dx = bx - ax;
double dy = by - ay;
return sqrt( ( dx * dx ) + ( dy * dy ) );
}
double sizeDiag( const GeoHash& a ) const {
GeoHash b = a;
b.move( 1 , 1 );
return distance( a , b );
}
double sizeEdge( const GeoHash& a ) const {
double ax,ay,bx,by;
GeoHash b = a;
b.move( 1 , 1 );
unhash( a, ax, ay );
unhash( b, bx, by );
// _min and _max are a singularity
if (bx == _min)
bx = _max;
return (fabs(ax-bx));
}
const IndexDetails* getDetails() const {
return _spec->getDetails();
}
virtual shared_ptr<Cursor> newCursor( const BSONObj& query , const BSONObj& order , int numWanted ) const;
virtual IndexSuitability suitability( const BSONObj& query , const BSONObj& order ) const {
BSONElement e = query.getFieldDotted(_geo.c_str());
switch ( e.type() ) {
case Object: {
BSONObj sub = e.embeddedObject();
switch ( sub.firstElement().getGtLtOp() ) {
case BSONObj::opNEAR:
case BSONObj::opWITHIN:
return OPTIMAL;
default:;
}
}
case Array:
// Non-geo index data is stored in a non-standard way, cannot use for exact lookups with
// additional criteria
if ( query.nFields() > 1 ) return USELESS;
return HELPFUL;
default:
return USELESS;
}
}
string _geo;
vector<string> _other;
unsigned _bits;
int _max;
int _min;
double _scaling;
BSONObj _order;
double _error;
};
class Box {
public:
Box( const Geo2dType * g , const GeoHash& hash )
: _min( g , hash ) ,
_max( _min._x + g->sizeEdge( hash ) , _min._y + g->sizeEdge( hash ) ) {
}
Box( double x , double y , double size )
: _min( x , y ) ,
_max( x + size , y + size ) {
}
Box( Point min , Point max )
: _min( min ) , _max( max ) {
}
Box() {}
string toString() const {
StringBuilder buf(64);
buf << _min.toString() << " -->> " << _max.toString();
return buf.str();
}
bool between( double min , double max , double val , double fudge=0) const {
return val + fudge >= min && val <= max + fudge;
}
bool mid( double amin , double amax , double bmin , double bmax , bool min , double& res ) const {
assert( amin <= amax );
assert( bmin <= bmax );
if ( amin < bmin ) {
if ( amax < bmin )
return false;
res = min ? bmin : amax;
return true;
}
if ( amin > bmax )
return false;
res = min ? amin : bmax;
return true;
}
double intersects( const Box& other ) const {
Point boundMin(0,0);
Point boundMax(0,0);
if ( mid( _min._x , _max._x , other._min._x , other._max._x , true , boundMin._x ) == false ||
mid( _min._x , _max._x , other._min._x , other._max._x , false , boundMax._x ) == false ||
mid( _min._y , _max._y , other._min._y , other._max._y , true , boundMin._y ) == false ||
mid( _min._y , _max._y , other._min._y , other._max._y , false , boundMax._y ) == false )
return 0;
Box intersection( boundMin , boundMax );
return intersection.area() / ( ( area() + other.area() ) / 2 );
}
double area() const {
return ( _max._x - _min._x ) * ( _max._y - _min._y );
}
Point center() const {
return Point( ( _min._x + _max._x ) / 2 ,
( _min._y + _max._y ) / 2 );
}
bool inside( Point p , double fudge = 0 ) {
bool res = inside( p._x , p._y , fudge );
//cout << "is : " << p.toString() << " in " << toString() << " = " << res << endl;
return res;
}
bool inside( double x , double y , double fudge = 0 ) {
return
between( _min._x , _max._x , x , fudge ) &&
between( _min._y , _max._y , y , fudge );
}
bool contains(const Box& other, double fudge=0) {
return inside(other._min, fudge) && inside(other._max, fudge);
}
Point _min;
Point _max;
};
class Geo2dPlugin : public IndexPlugin {
public:
Geo2dPlugin() : IndexPlugin( GEO2DNAME ) {
}
virtual IndexType* generate( const IndexSpec* spec ) const {
return new Geo2dType( this , spec );
}
} geo2dplugin;
struct GeoUnitTest : public UnitTest {
int round( double d ) {
return (int)(.5+(d*1000));
}
#define GEOHEQ(a,b) if ( a.toString() != b ){ cout << "[" << a.toString() << "] != [" << b << "]" << endl; assert( a == GeoHash(b) ); }
void run() {
assert( ! GeoHash::isBitSet( 0 , 0 ) );
assert( ! GeoHash::isBitSet( 0 , 31 ) );
assert( GeoHash::isBitSet( 1 , 31 ) );
IndexSpec i( BSON( "loc" << "2d" ) );
Geo2dType g( &geo2dplugin , &i );
{
double x = 73.01212;
double y = 41.352964;
BSONObj in = BSON( "x" << x << "y" << y );
GeoHash h = g._hash( in );
BSONObj out = g._unhash( h );
assert( round(x) == round( out["x"].number() ) );
assert( round(y) == round( out["y"].number() ) );
assert( round( in["x"].number() ) == round( out["x"].number() ) );
assert( round( in["y"].number() ) == round( out["y"].number() ) );
}
{
double x = -73.01212;
double y = 41.352964;
BSONObj in = BSON( "x" << x << "y" << y );
GeoHash h = g._hash( in );
BSONObj out = g._unhash( h );
assert( round(x) == round( out["x"].number() ) );
assert( round(y) == round( out["y"].number() ) );
assert( round( in["x"].number() ) == round( out["x"].number() ) );
assert( round( in["y"].number() ) == round( out["y"].number() ) );
}
{
GeoHash h( "0000" );
h.move( 0 , 1 );
GEOHEQ( h , "0001" );
h.move( 0 , -1 );
GEOHEQ( h , "0000" );
h.init( "0001" );
h.move( 0 , 1 );
GEOHEQ( h , "0100" );
h.move( 0 , -1 );
GEOHEQ( h , "0001" );
h.init( "0000" );
h.move( 1 , 0 );
GEOHEQ( h , "0010" );
}
{
Box b( 5 , 5 , 2 );
assert( "(5,5) -->> (7,7)" == b.toString() );
}
{
GeoHash a = g.hash( 1 , 1 );
GeoHash b = g.hash( 4 , 5 );
assert( 5 == (int)(g.distance( a , b ) ) );
a = g.hash( 50 , 50 );
b = g.hash( 42 , 44 );
assert( round(10) == round(g.distance( a , b )) );
}
{
GeoHash x("0000");
assert( 0 == x.getHash() );
x.init( 0 , 1 , 32 );
GEOHEQ( x , "0000000000000000000000000000000000000000000000000000000000000001" )
assert( GeoHash( "1100").hasPrefix( GeoHash( "11" ) ) );
assert( ! GeoHash( "1000").hasPrefix( GeoHash( "11" ) ) );
}
{
GeoHash x("1010");
GEOHEQ( x , "1010" );
GeoHash y = x + "01";
GEOHEQ( y , "101001" );
}
{
GeoHash a = g.hash( 5 , 5 );
GeoHash b = g.hash( 5 , 7 );
GeoHash c = g.hash( 100 , 100 );
/*
cout << "a: " << a << endl;
cout << "b: " << b << endl;
cout << "c: " << c << endl;
cout << "a: " << a.toStringHex1() << endl;
cout << "b: " << b.toStringHex1() << endl;
cout << "c: " << c.toStringHex1() << endl;
*/
BSONObj oa = a.wrap();
BSONObj ob = b.wrap();
BSONObj oc = c.wrap();
/*
cout << "a: " << oa.hexDump() << endl;
cout << "b: " << ob.hexDump() << endl;
cout << "c: " << oc.hexDump() << endl;
*/
assert( oa.woCompare( ob ) < 0 );
assert( oa.woCompare( oc ) < 0 );
}
{
GeoHash x( "000000" );
x.move( -1 , 0 );
GEOHEQ( x , "101010" );
x.move( 1 , -1 );
GEOHEQ( x , "010101" );
x.move( 0 , 1 );
GEOHEQ( x , "000000" );
}
{
GeoHash prefix( "110011000000" );
GeoHash entry( "1100110000011100000111000001110000011100000111000001000000000000" );
assert( ! entry.hasPrefix( prefix ) );
entry = GeoHash("1100110000001100000111000001110000011100000111000001000000000000");
assert( entry.toString().find( prefix.toString() ) == 0 );
assert( entry.hasPrefix( GeoHash( "1100" ) ) );
assert( entry.hasPrefix( prefix ) );
}
{
GeoHash a = g.hash( 50 , 50 );
GeoHash b = g.hash( 48 , 54 );
assert( round( 4.47214 ) == round( g.distance( a , b ) ) );
}
{
Box b( Point( 29.762283 , -95.364271 ) , Point( 29.764283000000002 , -95.36227099999999 ) );
assert( b.inside( 29.763 , -95.363 ) );
assert( ! b.inside( 32.9570255 , -96.1082497 ) );
assert( ! b.inside( 32.9570255 , -96.1082497 , .01 ) );
}
{
GeoHash a( "11001111" );
assert( GeoHash( "11" ) == a.commonPrefix( GeoHash("11") ) );
assert( GeoHash( "11" ) == a.commonPrefix( GeoHash("11110000") ) );
}
{
int N = 10000;
{
Timer t;
for ( int i=0; i<N; i++ ) {
unsigned x = (unsigned)rand();
unsigned y = (unsigned)rand();
GeoHash h( x , y );
unsigned a,b;
h.unhash_slow( a,b );
assert( a == x );
assert( b == y );
}
//cout << "slow: " << t.millis() << endl;
}
{
Timer t;
for ( int i=0; i<N; i++ ) {
unsigned x = (unsigned)rand();
unsigned y = (unsigned)rand();
GeoHash h( x , y );
unsigned a,b;
h.unhash_fast( a,b );
assert( a == x );
assert( b == y );
}
//cout << "fast: " << t.millis() << endl;
}
}
{
// see http://en.wikipedia.org/wiki/Great-circle_distance#Worked_example
{
Point BNA (-86.67, 36.12);
Point LAX (-118.40, 33.94);
double dist1 = spheredist_deg(BNA, LAX);
double dist2 = spheredist_deg(LAX, BNA);
// target is 0.45306
assert( 0.45305 <= dist1 && dist1 <= 0.45307 );
assert( 0.45305 <= dist2 && dist2 <= 0.45307 );
}
{
Point BNA (-1.5127, 0.6304);
Point LAX (-2.0665, 0.5924);
double dist1 = spheredist_rad(BNA, LAX);
double dist2 = spheredist_rad(LAX, BNA);
// target is 0.45306
assert( 0.45305 <= dist1 && dist1 <= 0.45307 );
assert( 0.45305 <= dist2 && dist2 <= 0.45307 );
}
{
Point JFK (-73.77694444, 40.63861111 );
Point LAX (-118.40, 33.94);
double dist = spheredist_deg(JFK, LAX) * EARTH_RADIUS_MILES;
assert( dist > 2469 && dist < 2470 );
}
{
Point BNA (-86.67, 36.12);
Point LAX (-118.40, 33.94);
Point JFK (-73.77694444, 40.63861111 );
assert( spheredist_deg(BNA, BNA) < 1e-6);
assert( spheredist_deg(LAX, LAX) < 1e-6);
assert( spheredist_deg(JFK, JFK) < 1e-6);
Point zero (0, 0);
Point antizero (0,-180);
// these were known to cause NaN
assert( spheredist_deg(zero, zero) < 1e-6);
assert( fabs(M_PI-spheredist_deg(zero, antizero)) < 1e-6);
assert( fabs(M_PI-spheredist_deg(antizero, zero)) < 1e-6);
}
}
}
} geoUnitTest;
class GeoPoint {
public:
GeoPoint() {
}
GeoPoint( const KeyNode& node , double distance )
: _key( node.key ) , _loc( node.recordLoc ) , _o( node.recordLoc.obj() ) , _distance( distance ) {
}
GeoPoint( const BSONObj& key , DiskLoc loc , double distance )
: _key(key) , _loc(loc) , _o( loc.obj() ) , _distance( distance ) {
}
bool operator<( const GeoPoint& other ) const {
return _distance < other._distance;
}
bool isEmpty() const {
return _o.isEmpty();
}
BSONObj _key;
DiskLoc _loc;
BSONObj _o;
double _distance;
};
class GeoAccumulator {
public:
GeoAccumulator( const Geo2dType * g , const BSONObj& filter )
: _g(g) , _lookedAt(0) , _objectsLoaded(0) , _found(0) {
if ( ! filter.isEmpty() ) {
_matcher.reset( new CoveredIndexMatcher( filter , g->keyPattern() ) );
}
}
virtual ~GeoAccumulator() {
}
virtual void add( const KeyNode& node ) {
// when looking at other boxes, don't want to look at some object twice
pair<set<DiskLoc>::iterator,bool> seenBefore = _seen.insert( node.recordLoc );
if ( ! seenBefore.second ) {
GEODEBUG( "\t\t\t\t already seen : " << node.recordLoc.obj()["_id"] );
return;
}
_lookedAt++;
// distance check
double d = 0;
if ( ! checkDistance( GeoHash( node.key.firstElement() ) , d ) ) {
GEODEBUG( "\t\t\t\t bad distance : " << node.recordLoc.obj() << "\t" << d );
return;
}
GEODEBUG( "\t\t\t\t good distance : " << node.recordLoc.obj() << "\t" << d );
// matcher
MatchDetails details;
if ( _matcher.get() ) {
bool good = _matcher->matches( node.key , node.recordLoc , &details );
if ( details.loadedObject )
_objectsLoaded++;
if ( ! good ) {
GEODEBUG( "\t\t\t\t didn't match : " << node.recordLoc.obj()["_id"] );
return;
}
}
if ( ! details.loadedObject ) // dont double count
_objectsLoaded++;
addSpecific( node , d );
_found++;
}
virtual void addSpecific( const KeyNode& node , double d ) = 0;
virtual bool checkDistance( const GeoHash& node , double& d ) = 0;
long long found() const {
return _found;
}
const Geo2dType * _g;
set<DiskLoc> _seen;
auto_ptr<CoveredIndexMatcher> _matcher;
long long _lookedAt;
long long _objectsLoaded;
long long _found;
};
class GeoHopper : public GeoAccumulator {
public:
typedef multiset<GeoPoint> Holder;
GeoHopper( const Geo2dType * g , unsigned max , const Point& n , const BSONObj& filter = BSONObj() , double maxDistance = numeric_limits<double>::max() , GeoDistType type=GEO_PLAIN)
: GeoAccumulator( g , filter ) , _max( max ) , _near( n ), _maxDistance( maxDistance ), _type( type ), _farthest(-1)
{}
virtual bool checkDistance( const GeoHash& h , double& d ) {
switch (_type) {
case GEO_PLAIN:
d = _near.distance( Point(_g, h) );
break;
case GEO_SPHERE:
d = spheredist_deg(_near, Point(_g, h));
break;
default:
assert(0);
}
bool good = d < _maxDistance && ( _points.size() < _max || d < farthest() );
GEODEBUG( "\t\t\t\t\t\t\t checkDistance " << _near.toString() << "\t" << h << "\t" << d
<< " ok: " << good << " farthest: " << farthest() );
return good;
}
virtual void addSpecific( const KeyNode& node , double d ) {
GEODEBUG( "\t\t" << GeoHash( node.key.firstElement() ) << "\t" << node.recordLoc.obj() << "\t" << d );
_points.insert( GeoPoint( node.key , node.recordLoc , d ) );
if ( _points.size() > _max ) {
_points.erase( --_points.end() );
Holder::iterator i = _points.end();
i--;
_farthest = i->_distance;
}
else {
if (d > _farthest)
_farthest = d;
}
}
double farthest() const {
return _farthest;
}
unsigned _max;
Point _near;
Holder _points;
double _maxDistance;
GeoDistType _type;
double _farthest;
};
struct BtreeLocation {
int pos;
bool found;
DiskLoc bucket;
BSONObj key() {
if ( bucket.isNull() )
return BSONObj();
return bucket.btree()->keyNode( pos ).key;
}
bool hasPrefix( const GeoHash& hash ) {
BSONElement e = key().firstElement();
if ( e.eoo() )
return false;
return GeoHash( e ).hasPrefix( hash );
}
bool advance( int direction , int& totalFound , GeoAccumulator* all ) {
if ( bucket.isNull() )
return false;
bucket = bucket.btree()->advance( bucket , pos , direction , "btreelocation" );
if ( all )
return checkCur( totalFound , all );
return ! bucket.isNull();
}
bool checkCur( int& totalFound , GeoAccumulator* all ) {
if ( bucket.isNull() )
return false;
if ( bucket.btree()->isUsed(pos) ) {
totalFound++;
all->add( bucket.btree()->keyNode( pos ) );
}
else {
GEODEBUG( "\t\t\t\t not used: " << key() );
}
return true;
}
string toString() {
stringstream ss;
ss << "bucket: " << bucket.toString() << " pos: " << pos << " found: " << found;
return ss.str();
}
static bool initial( const IndexDetails& id , const Geo2dType * spec ,
BtreeLocation& min , BtreeLocation& max ,
GeoHash start ,
int & found , GeoAccumulator * hopper ) {
Ordering ordering = Ordering::make(spec->_order);
min.bucket = id.head.btree()->locate( id , id.head , start.wrap() ,
ordering , min.pos , min.found , minDiskLoc );
if (hopper) min.checkCur( found , hopper );
max = min;
if ( min.bucket.isNull() || ( hopper && !(hopper->found()) ) ) {
min.bucket = id.head.btree()->locate( id , id.head , start.wrap() ,
ordering , min.pos , min.found , minDiskLoc , -1 );
if (hopper) min.checkCur( found , hopper );
}
return ! min.bucket.isNull() || ! max.bucket.isNull();
}
};
class GeoSearch {
public:
GeoSearch( const Geo2dType * g , const GeoHash& n , int numWanted=100 , BSONObj filter=BSONObj() , double maxDistance = numeric_limits<double>::max() , GeoDistType type=GEO_PLAIN)
: _spec( g ) ,_startPt(g,n), _start( n ) ,
_numWanted( numWanted ) , _filter( filter ) , _maxDistance( maxDistance ) ,
_hopper( new GeoHopper( g , numWanted , _startPt , filter , maxDistance, type ) ), _type(type) {
assert( g->getDetails() );
_nscanned = 0;
_found = 0;
if (type == GEO_PLAIN) {
_scanDistance = maxDistance;
}
else if (type == GEO_SPHERE) {
if (maxDistance == numeric_limits<double>::max()) {
_scanDistance = maxDistance;
}
else {
//TODO: consider splitting into x and y scan distances
_scanDistance = computeXScanDistance(_startPt._y, rad2deg(maxDistance));
}
}
else {
assert(0);
}
}
void exec() {
const IndexDetails& id = *_spec->getDetails();
const BtreeBucket * head = id.head.btree();
assert( head );
/*
* Search algorithm
* 1) use geohash prefix to find X items
* 2) compute max distance from want to an item
* 3) find optimal set of boxes that complete circle
* 4) use regular btree cursors to scan those boxes
*/
GeoHopper * hopper = _hopper.get();
_prefix = _start;
BtreeLocation min,max;
{
// 1 regular geo hash algorithm
if ( ! BtreeLocation::initial( id , _spec , min , max , _start , _found , NULL ) )
return;
while ( !_prefix.constrains() || // if next pass would cover universe, just keep going
( _hopper->found() < _numWanted && _spec->sizeEdge( _prefix ) <= _scanDistance)) {
GEODEBUG( _prefix << "\t" << _found << "\t DESC" );
while ( min.hasPrefix(_prefix) && min.checkCur(_found, hopper) && min.advance(-1, _found, NULL) )
_nscanned++;
GEODEBUG( _prefix << "\t" << _found << "\t ASC" );
while ( max.hasPrefix(_prefix) && max.checkCur(_found, hopper) && max.advance(+1, _found, NULL) )
_nscanned++;
if ( ! _prefix.constrains() ) {
GEODEBUG( "done search w/o part 2" )
return;
}
_alreadyScanned = Box(_spec, _prefix);
_prefix = _prefix.up();
}
}
GEODEBUG( "done part 1" );
{
// 2
double farthest = hopper->farthest();
GEODEBUGPRINT(hopper->farthest());
if (hopper->found() < _numWanted) {
// Not enough found in Phase 1
farthest = _scanDistance;
}
else if (_type == GEO_SPHERE) {
farthest = std::min(_scanDistance, computeXScanDistance(_startPt._y, rad2deg(farthest)));
}
GEODEBUGPRINT(farthest);
Box want( _startPt._x - farthest , _startPt._y - farthest , farthest * 2 );
GEODEBUGPRINT(want.toString());
_prefix = _start;
while (_prefix.constrains() && _spec->sizeEdge( _prefix ) < farthest ) {
_prefix = _prefix.up();
}
PREFIXDEBUG(_prefix, _spec);
if (_prefix.getBits() <= 1) {
// TODO consider walking in $natural order
while ( min.checkCur(_found, hopper) && min.advance(-1, _found, NULL) )
_nscanned++;
while ( max.checkCur(_found, hopper) && max.advance(+1, _found, NULL) )
_nscanned++;
GEODEBUG( "done search after scanning whole collection" )
return;
}
if ( logLevel > 0 ) {
log(1) << "want: " << want << " found:" << _found << " nscanned: " << _nscanned << " hash size:" << _spec->sizeEdge( _prefix )
<< " farthest: " << farthest << " using box: " << Box( _spec , _prefix ).toString() << endl;
}
for ( int x=-1; x<=1; x++ ) {
for ( int y=-1; y<=1; y++ ) {
GeoHash toscan = _prefix;
toscan.move( x , y );