latlong_distance_keymaker.cc

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/* Copyright 2008 Lemur Consulting Ltd
 * Copyright 2011 Richard Boulton
 * Copyright 2012 Olly Betts
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <https://www.gnu.org/licenses/>.
 */
 
#include <config.h>
 
#include "xapian/geospatial.h"
#include "xapian/document.h"
#include "xapian/queryparser.h" // For sortable_serialise.
 
using namespace Xapian;
using namespace std;
 
string
LatLongDistanceKeyMaker::operator()(const Document &doc) const
{
    string val(doc.get_value(slot));
    if (val.empty()) {
        return defkey;
    }
    LatLongCoords doccoords;
    doccoords.unserialise(val);
    double distance = (*metric)(centre, doccoords);
    return sortable_serialise(distance);
}
 
LatLongDistanceKeyMaker::~LatLongDistanceKeyMaker()
{
    delete metric;
}