[11002] | 1 | // License: GPL. For details, see LICENSE file.
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| 2 | package org.openstreetmap.josm.io;
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| 3 |
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| 4 | import static org.openstreetmap.josm.tools.I18n.tr;
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| 5 |
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| 6 | import java.io.IOException;
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| 7 | import java.io.Reader;
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| 8 | import java.net.URL;
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[11016] | 9 | import java.util.Collections;
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[11002] | 10 | import java.util.LinkedList;
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| 11 | import java.util.List;
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| 12 |
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| 13 | import javax.xml.parsers.ParserConfigurationException;
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| 14 |
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| 15 | import org.openstreetmap.josm.data.Bounds;
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[11003] | 16 | import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
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| 17 | import org.openstreetmap.josm.data.osm.PrimitiveId;
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| 18 | import org.openstreetmap.josm.data.osm.SimplePrimitiveId;
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[12557] | 19 | import org.openstreetmap.josm.data.preferences.StringProperty;
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[11002] | 20 | import org.openstreetmap.josm.tools.HttpClient;
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[12557] | 21 | import org.openstreetmap.josm.tools.HttpClient.Response;
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[12620] | 22 | import org.openstreetmap.josm.tools.Logging;
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[11002] | 23 | import org.openstreetmap.josm.tools.OsmUrlToBounds;
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| 24 | import org.openstreetmap.josm.tools.UncheckedParseException;
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| 25 | import org.openstreetmap.josm.tools.Utils;
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[13901] | 26 | import org.openstreetmap.josm.tools.XmlUtils;
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[11002] | 27 | import org.xml.sax.Attributes;
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| 28 | import org.xml.sax.InputSource;
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| 29 | import org.xml.sax.SAXException;
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| 30 | import org.xml.sax.helpers.DefaultHandler;
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| 31 |
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| 32 | /**
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| 33 | * Search for names and related items.
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| 34 | * @since 11002
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| 35 | */
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[11009] | 36 | public final class NameFinder {
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[11002] | 37 |
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[11009] | 38 | /**
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[12557] | 39 | * Nominatim default URL.
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[11009] | 40 | */
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[11002] | 41 | public static final String NOMINATIM_URL = "https://nominatim.openstreetmap.org/search?format=xml&q=";
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| 42 |
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[12557] | 43 | /**
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| 44 | * Nominatim URL property.
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[12558] | 45 | * @since 12557
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[12557] | 46 | */
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| 47 | public static final StringProperty NOMINATIM_URL_PROP = new StringProperty("nominatim-url", NOMINATIM_URL);
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| 48 |
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[11002] | 49 | private NameFinder() {
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| 50 | }
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| 51 |
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[11016] | 52 | /**
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| 53 | * Performs a Nominatim search.
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| 54 | * @param searchExpression Nominatim search expression
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| 55 | * @return search results
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| 56 | * @throws IOException if any IO error occurs.
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| 57 | */
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[11002] | 58 | public static List<SearchResult> queryNominatim(final String searchExpression) throws IOException {
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[12557] | 59 | return query(new URL(NOMINATIM_URL_PROP.get() + Utils.encodeUrl(searchExpression)));
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[11002] | 60 | }
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| 61 |
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[11016] | 62 | /**
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| 63 | * Performs a custom search.
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| 64 | * @param url search URL to any Nominatim instance
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| 65 | * @return search results
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| 66 | * @throws IOException if any IO error occurs.
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| 67 | */
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[11002] | 68 | public static List<SearchResult> query(final URL url) throws IOException {
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| 69 | final HttpClient connection = HttpClient.create(url);
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[12557] | 70 | Response response = connection.connect();
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| 71 | if (response.getResponseCode() >= 400) {
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| 72 | throw new IOException(response.getResponseMessage() + ": " + response.fetchContent());
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| 73 | }
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| 74 | try (Reader reader = response.getContentReader()) {
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[11002] | 75 | return parseSearchResults(reader);
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| 76 | } catch (ParserConfigurationException | SAXException ex) {
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| 77 | throw new UncheckedParseException(ex);
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| 78 | }
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| 79 | }
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| 80 |
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[11016] | 81 | /**
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| 82 | * Parse search results as returned by Nominatim.
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| 83 | * @param reader reader
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| 84 | * @return search results
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| 85 | * @throws ParserConfigurationException if a parser cannot be created which satisfies the requested configuration.
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| 86 | * @throws SAXException for SAX errors.
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| 87 | * @throws IOException if any IO error occurs.
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| 88 | */
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[11002] | 89 | public static List<SearchResult> parseSearchResults(Reader reader) throws IOException, ParserConfigurationException, SAXException {
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| 90 | InputSource inputSource = new InputSource(reader);
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| 91 | NameFinderResultParser parser = new NameFinderResultParser();
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[13901] | 92 | XmlUtils.parseSafeSAX(inputSource, parser);
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[11002] | 93 | return parser.getResult();
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| 94 | }
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| 95 |
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| 96 | /**
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| 97 | * Data storage for search results.
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| 98 | */
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| 99 | public static class SearchResult {
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[11009] | 100 | private String name;
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| 101 | private String info;
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| 102 | private String nearestPlace;
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| 103 | private String description;
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| 104 | private double lat;
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| 105 | private double lon;
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| 106 | private int zoom;
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| 107 | private Bounds bounds;
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| 108 | private PrimitiveId osmId;
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[11002] | 109 |
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[11009] | 110 | /**
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| 111 | * Returns the name.
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| 112 | * @return the name
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| 113 | */
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| 114 | public final String getName() {
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| 115 | return name;
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| 116 | }
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| 117 |
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| 118 | /**
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| 119 | * Returns the info.
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| 120 | * @return the info
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| 121 | */
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| 122 | public final String getInfo() {
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| 123 | return info;
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| 124 | }
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| 125 |
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| 126 | /**
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| 127 | * Returns the nearest place.
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| 128 | * @return the nearest place
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| 129 | */
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| 130 | public final String getNearestPlace() {
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| 131 | return nearestPlace;
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| 132 | }
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| 133 |
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| 134 | /**
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| 135 | * Returns the description.
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| 136 | * @return the description
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| 137 | */
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| 138 | public final String getDescription() {
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| 139 | return description;
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| 140 | }
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| 141 |
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| 142 | /**
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| 143 | * Returns the latitude.
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| 144 | * @return the latitude
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| 145 | */
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| 146 | public final double getLat() {
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| 147 | return lat;
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| 148 | }
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| 149 |
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| 150 | /**
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| 151 | * Returns the longitude.
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| 152 | * @return the longitude
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| 153 | */
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| 154 | public final double getLon() {
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| 155 | return lon;
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| 156 | }
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| 157 |
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| 158 | /**
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| 159 | * Returns the zoom.
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| 160 | * @return the zoom
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| 161 | */
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| 162 | public final int getZoom() {
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| 163 | return zoom;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * Returns the bounds.
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| 168 | * @return the bounds
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| 169 | */
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| 170 | public final Bounds getBounds() {
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| 171 | return bounds;
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| 172 | }
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| 173 |
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| 174 | /**
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| 175 | * Returns the OSM id.
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| 176 | * @return the OSM id
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| 177 | */
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| 178 | public final PrimitiveId getOsmId() {
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| 179 | return osmId;
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| 180 | }
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| 181 |
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| 182 | /**
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| 183 | * Returns the download area.
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| 184 | * @return the download area
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| 185 | */
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[11002] | 186 | public Bounds getDownloadArea() {
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| 187 | return bounds != null ? bounds : OsmUrlToBounds.positionToBounds(lat, lon, zoom);
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| 188 | }
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| 189 | }
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| 190 |
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| 191 | /**
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| 192 | * A very primitive parser for the name finder's output.
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| 193 | * Structure of xml described here: http://wiki.openstreetmap.org/index.php/Name_finder
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| 194 | */
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| 195 | private static class NameFinderResultParser extends DefaultHandler {
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| 196 | private SearchResult currentResult;
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| 197 | private StringBuilder description;
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| 198 | private int depth;
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| 199 | private final List<SearchResult> data = new LinkedList<>();
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| 200 |
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| 201 | /**
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| 202 | * Detect starting elements.
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| 203 | */
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| 204 | @Override
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| 205 | public void startElement(String namespaceURI, String localName, String qName, Attributes atts)
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| 206 | throws SAXException {
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| 207 | depth++;
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| 208 | try {
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| 209 | if ("searchresults".equals(qName)) {
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| 210 | // do nothing
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[11452] | 211 | } else if (depth == 2 && "named".equals(qName)) {
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[11002] | 212 | currentResult = new SearchResult();
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| 213 | currentResult.name = atts.getValue("name");
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| 214 | currentResult.info = atts.getValue("info");
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| 215 | if (currentResult.info != null) {
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| 216 | currentResult.info = tr(currentResult.info);
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| 217 | }
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| 218 | currentResult.lat = Double.parseDouble(atts.getValue("lat"));
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| 219 | currentResult.lon = Double.parseDouble(atts.getValue("lon"));
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| 220 | currentResult.zoom = Integer.parseInt(atts.getValue("zoom"));
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| 221 | data.add(currentResult);
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[11452] | 222 | } else if (depth == 3 && "description".equals(qName)) {
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[11002] | 223 | description = new StringBuilder();
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[11452] | 224 | } else if (depth == 4 && "named".equals(qName)) {
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[11002] | 225 | // this is a "named" place in the nearest places list.
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| 226 | String info = atts.getValue("info");
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| 227 | if ("city".equals(info) || "town".equals(info) || "village".equals(info)) {
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| 228 | currentResult.nearestPlace = atts.getValue("name");
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| 229 | }
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| 230 | } else if ("place".equals(qName) && atts.getValue("lat") != null) {
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| 231 | currentResult = new SearchResult();
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| 232 | currentResult.name = atts.getValue("display_name");
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| 233 | currentResult.description = currentResult.name;
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| 234 | currentResult.info = atts.getValue("class");
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| 235 | if (currentResult.info != null) {
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| 236 | currentResult.info = tr(currentResult.info);
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| 237 | }
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| 238 | currentResult.nearestPlace = tr(atts.getValue("type"));
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| 239 | currentResult.lat = Double.parseDouble(atts.getValue("lat"));
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| 240 | currentResult.lon = Double.parseDouble(atts.getValue("lon"));
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| 241 | String[] bbox = atts.getValue("boundingbox").split(",");
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| 242 | currentResult.bounds = new Bounds(
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| 243 | Double.parseDouble(bbox[0]), Double.parseDouble(bbox[2]),
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| 244 | Double.parseDouble(bbox[1]), Double.parseDouble(bbox[3]));
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[11003] | 245 | final String osmId = atts.getValue("osm_id");
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| 246 | final String osmType = atts.getValue("osm_type");
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| 247 | if (osmId != null && osmType != null) {
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| 248 | currentResult.osmId = new SimplePrimitiveId(Long.parseLong(osmId), OsmPrimitiveType.from(osmType));
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| 249 | }
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[11002] | 250 | data.add(currentResult);
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| 251 | }
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[11620] | 252 | } catch (NumberFormatException ex) {
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[12620] | 253 | Logging.error(ex); // SAXException does not chain correctly
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[11620] | 254 | throw new SAXException(ex.getMessage(), ex);
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[11746] | 255 | } catch (NullPointerException ex) { // NOPMD
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[12620] | 256 | Logging.error(ex); // SAXException does not chain correctly
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[11620] | 257 | throw new SAXException(tr("Null pointer exception, possibly some missing tags."), ex);
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[11002] | 258 | }
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| 259 | }
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| 260 |
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| 261 | /**
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| 262 | * Detect ending elements.
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| 263 | */
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| 264 | @Override
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| 265 | public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
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[11452] | 266 | if (description != null && "description".equals(qName)) {
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[11002] | 267 | currentResult.description = description.toString();
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| 268 | description = null;
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| 269 | }
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| 270 | depth--;
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| 271 | }
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| 272 |
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| 273 | /**
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| 274 | * Read characters for description.
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| 275 | */
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| 276 | @Override
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| 277 | public void characters(char[] data, int start, int length) throws SAXException {
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| 278 | if (description != null) {
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| 279 | description.append(data, start, length);
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| 280 | }
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| 281 | }
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| 282 |
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| 283 | public List<SearchResult> getResult() {
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[11016] | 284 | return Collections.unmodifiableList(data);
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[11002] | 285 | }
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| 286 | }
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| 287 | }
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