001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.io;
003
004import java.util.Set;
005import java.util.function.Function;
006
007import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
008import org.openstreetmap.josm.gui.preferences.server.OverpassServerPreference;
009import org.openstreetmap.josm.tools.Utils;
010
011/**
012 * Retrieves a set of {@link org.openstreetmap.josm.data.osm.OsmPrimitive}s from an Overpass API server.
013 *
014 * @since 9241
015 */
016class MultiFetchOverpassObjectReader extends MultiFetchServerObjectReader {
017
018    @Override
019    protected String buildRequestString(final OsmPrimitiveType type, Set<Long> idPackage) {
020        final Function<Long, Object> toOverpassExpression = x -> type.getAPIName() + '(' + x + ");>;";
021        final String query = '(' + Utils.join("", Utils.transform(idPackage, toOverpassExpression)) + ");out meta;";
022        return "interpreter?data=" + Utils.encodeUrl(query);
023    }
024
025    @Override
026    protected String getBaseUrl() {
027        return OverpassServerPreference.getOverpassServer();
028    }
029
030    @Override
031    protected boolean recursesDown() {
032        // see https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#Recurse_down_.28.3E.29 for documentation
033        // accomplished using >; in the query string above
034        return true;
035    }
036}