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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9 | import java.util.Collections;
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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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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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19 | import org.openstreetmap.josm.data.preferences.StringProperty;
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20 | import org.openstreetmap.josm.tools.HttpClient;
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21 | import org.openstreetmap.josm.tools.HttpClient.Response;
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22 | import org.openstreetmap.josm.tools.Logging;
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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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26 | import org.openstreetmap.josm.tools.XmlUtils;
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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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36 | public final class NameFinder {
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37 |
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38 | /**
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39 | * Nominatim default URL.
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40 | */
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41 | public static final String NOMINATIM_URL = "https://nominatim.openstreetmap.org/search?format=xml&q=";
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42 |
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43 | /**
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44 | * Nominatim URL property.
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45 | * @since 12557
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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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49 | private NameFinder() {
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50 | }
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51 |
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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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58 | public static List<SearchResult> queryNominatim(final String searchExpression) throws IOException {
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59 | return query(new URL(NOMINATIM_URL_PROP.get() + Utils.encodeUrl(searchExpression)));
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60 | }
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61 |
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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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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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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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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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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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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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92 | XmlUtils.parseSafeSAX(inputSource, parser);
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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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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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109 |
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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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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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211 | } else if (depth == 2 && "named".equals(qName)) {
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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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222 | } else if (depth == 3 && "description".equals(qName)) {
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223 | description = new StringBuilder();
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224 | } else if (depth == 4 && "named".equals(qName)) {
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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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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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250 | data.add(currentResult);
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251 | }
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252 | } catch (NumberFormatException ex) {
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253 | Logging.error(ex); // SAXException does not chain correctly
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254 | throw new SAXException(ex.getMessage(), ex);
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255 | } catch (NullPointerException ex) { // NOPMD
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256 | Logging.error(ex); // SAXException does not chain correctly
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257 | throw new SAXException(tr("Null pointer exception, possibly some missing tags."), ex);
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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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266 | if (description != null && "description".equals(qName)) {
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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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284 | return Collections.unmodifiableList(data);
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285 | }
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286 | }
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287 | }
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