GeoCodeUtils.js

/**
 * Copyright 2015, GeoSolutions Sas.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree.
 */

const GeoCodeUtils = {
    // nominatim is south lat, north lat, west lon, east  lon
    // bbox is      west  lon, south lat, east lon, north lat
    // so:          0 --> 1,  1 --> 3.  2 --> 0,  3 --> 2
    nominiatimIndexToBboxIndex: (index) => {
        switch (index) {
        case 0:
            return 1;
        case 1:
            return 3;
        case 2:
            return 0;
        case 3:
            return 2;
        default:
        }
    },
    /**
     * @return a filtered version of INFO_FORMATS object.
     * the returned object contains only keys that AVAILABLE_FORMAT contains.
     */
    nominatimToGeoJson(searchResults) {
        if (searchResults === null) {
            return [];
        }
        return searchResults.map((result)=> {
            return {
                properties: {...result},
                id: result.osm_id,
                type: "Feature",
                bbox: result.boundingbox.map( (elem) => {return parseFloat(elem); }).reduce( (acc, currentValue, currentIndex) => {
                    acc[GeoCodeUtils.nominiatimIndexToBboxIndex(currentIndex)] = currentValue;
                    return acc;
                }, []),
                geometry: result.geojson || {
                    type: 'Point',
                    coordinates: [parseFloat(result.lon), parseFloat(result.lat)]
                }
            };
        });
    }, // see http://wiki.openstreetmap.org/wiki/Bounding_Box

    nominatimToLayer(name, searchResults) {
        return {
            type: 'vector',
            visibility: true,
            name: name || "Search Results",
            styleName: "marker",
            features: GeoCodeUtils.nominatimToGeoJson(searchResults)

        };
    }
};

module.exports = GeoCodeUtils;