source: josm/trunk/src/org/openstreetmap/josm/io/imagery/WMSImagery.java@ 6650

Last change on this file since 6650 was 6650, checked in by simon04, 10 years ago

see #9414 see #9542 - MapCSS validator: handle BOM in config files
File size: 13.8 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.io.imagery;
3
4import java.awt.HeadlessException;
5import java.io.BufferedReader;
6import java.io.IOException;
7import java.io.InputStream;
8import java.io.StringReader;
9import java.net.MalformedURLException;
10import java.net.URL;
11import java.net.URLConnection;
12import java.util.ArrayList;
13import java.util.Collection;
14import java.util.HashSet;
15import java.util.List;
16import java.util.Set;
17import java.util.regex.Pattern;
18
19import javax.xml.parsers.DocumentBuilder;
20import javax.xml.parsers.DocumentBuilderFactory;
21
22import org.openstreetmap.josm.Main;
23import org.openstreetmap.josm.data.Bounds;
24import org.openstreetmap.josm.data.imagery.ImageryInfo;
25import org.openstreetmap.josm.gui.preferences.projection.ProjectionChoice;
26import org.openstreetmap.josm.gui.preferences.projection.ProjectionPreference;
27import org.openstreetmap.josm.io.UTFInputStreamReader;
28import org.openstreetmap.josm.tools.Utils;
29import org.w3c.dom.Document;
30import org.w3c.dom.Element;
31import org.w3c.dom.Node;
32import org.w3c.dom.NodeList;
33import org.xml.sax.EntityResolver;
34import org.xml.sax.InputSource;
35import org.xml.sax.SAXException;
36
37public class WMSImagery {
38
39 public static class WMSGetCapabilitiesException extends Exception {
40 private final String incomingData;
41
42 public WMSGetCapabilitiesException(Throwable cause, String incomingData) {
43 super(cause);
44 this.incomingData = incomingData;
45 }
46
47 public String getIncomingData() {
48 return incomingData;
49 }
50 }
51
52 private List<LayerDetails> layers;
53 private URL serviceUrl;
54 private List<String> formats;
55
56 public List<LayerDetails> getLayers() {
57 return layers;
58 }
59
60 public URL getServiceUrl() {
61 return serviceUrl;
62 }
63
64 public List<String> getFormats() {
65 return formats;
66 }
67
68 String buildRootUrl() {
69 if (serviceUrl == null) {
70 return null;
71 }
72 StringBuilder a = new StringBuilder(serviceUrl.getProtocol());
73 a.append("://");
74 a.append(serviceUrl.getHost());
75 if (serviceUrl.getPort() != -1) {
76 a.append(":");
77 a.append(serviceUrl.getPort());
78 }
79 a.append(serviceUrl.getPath());
80 a.append("?");
81 if (serviceUrl.getQuery() != null) {
82 a.append(serviceUrl.getQuery());
83 if (!serviceUrl.getQuery().isEmpty() && !serviceUrl.getQuery().endsWith("&")) {
84 a.append("&");
85 }
86 }
87 return a.toString();
88 }
89
90 public String buildGetMapUrl(Collection<LayerDetails> selectedLayers) {
91 return buildGetMapUrl(selectedLayers, "image/jpeg");
92 }
93
94 public String buildGetMapUrl(Collection<LayerDetails> selectedLayers, String format) {
95 return buildRootUrl()
96 + "FORMAT=" + format + "&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&LAYERS="
97 + Utils.join(",", Utils.transform(selectedLayers, new Utils.Function<LayerDetails, String>() {
98 @Override
99 public String apply(LayerDetails x) {
100 return x.ident;
101 }
102 }))
103 + "&STYLES=&SRS={proj}&WIDTH={width}&HEIGHT={height}&BBOX={bbox}";
104 }
105
106 public void attemptGetCapabilities(String serviceUrlStr) throws MalformedURLException, IOException, WMSGetCapabilitiesException {
107 URL getCapabilitiesUrl = null;
108 try {
109 if (!Pattern.compile(".*GetCapabilities.*", Pattern.CASE_INSENSITIVE).matcher(serviceUrlStr).matches()) {
110 // If the url doesn't already have GetCapabilities, add it in
111 getCapabilitiesUrl = new URL(serviceUrlStr);
112 final String getCapabilitiesQuery = "VERSION=1.1.1&SERVICE=WMS&REQUEST=GetCapabilities";
113 if (getCapabilitiesUrl.getQuery() == null) {
114 getCapabilitiesUrl = new URL(serviceUrlStr + "?" + getCapabilitiesQuery);
115 } else if (!getCapabilitiesUrl.getQuery().isEmpty() && !getCapabilitiesUrl.getQuery().endsWith("&")) {
116 getCapabilitiesUrl = new URL(serviceUrlStr + "&" + getCapabilitiesQuery);
117 } else {
118 getCapabilitiesUrl = new URL(serviceUrlStr + getCapabilitiesQuery);
119 }
120 } else {
121 // Otherwise assume it's a good URL and let the subsequent error
122 // handling systems deal with problems
123 getCapabilitiesUrl = new URL(serviceUrlStr);
124 }
125 serviceUrl = new URL(serviceUrlStr);
126 } catch (HeadlessException e) {
127 return;
128 }
129
130 Main.info("GET " + getCapabilitiesUrl.toString());
131 URLConnection openConnection = Utils.openHttpConnection(getCapabilitiesUrl);
132 InputStream inputStream = openConnection.getInputStream();
133 BufferedReader br = new BufferedReader(UTFInputStreamReader.create(inputStream));
134 String line;
135 StringBuilder ba = new StringBuilder();
136 try {
137 while ((line = br.readLine()) != null) {
138 ba.append(line);
139 ba.append("\n");
140 }
141 } finally {
142 br.close();
143 }
144 String incomingData = ba.toString();
145
146 try {
147 DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
148 builderFactory.setValidating(false);
149 builderFactory.setNamespaceAware(true);
150 DocumentBuilder builder = null;
151 builder = builderFactory.newDocumentBuilder();
152 builder.setEntityResolver(new EntityResolver() {
153 @Override
154 public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
155 Main.info("Ignoring DTD " + publicId + ", " + systemId);
156 return new InputSource(new StringReader(""));
157 }
158 });
159 Document document = null;
160 document = builder.parse(new InputSource(new StringReader(incomingData)));
161
162 // Some WMS service URLs specify a different base URL for their GetMap service
163 Element child = getChild(document.getDocumentElement(), "Capability");
164 child = getChild(child, "Request");
165 child = getChild(child, "GetMap");
166
167 formats = new ArrayList<String>(Utils.transform(getChildren(child, "Format"), new Utils.Function<Element, String>() {
168 @Override
169 public String apply(Element x) {
170 return x.getTextContent();
171 }
172 }));
173
174 child = getChild(child, "DCPType");
175 child = getChild(child, "HTTP");
176 child = getChild(child, "Get");
177 child = getChild(child, "OnlineResource");
178 if (child != null) {
179 String baseURL = child.getAttribute("xlink:href");
180 if (baseURL != null && !baseURL.equals(serviceUrlStr)) {
181 Main.info("GetCapabilities specifies a different service URL: " + baseURL);
182 serviceUrl = new URL(baseURL);
183 }
184 }
185
186 Element capabilityElem = getChild(document.getDocumentElement(), "Capability");
187 List<Element> children = getChildren(capabilityElem, "Layer");
188 layers = parseLayers(children, new HashSet<String>());
189 } catch (Exception e) {
190 throw new WMSGetCapabilitiesException(e, incomingData);
191 }
192
193 }
194
195 public ImageryInfo toImageryInfo(String name, Collection<LayerDetails> selectedLayers) {
196 ImageryInfo i = new ImageryInfo(name, buildGetMapUrl(selectedLayers));
197 if (selectedLayers != null) {
198 HashSet<String> proj = new HashSet<String>();
199 for (WMSImagery.LayerDetails l : selectedLayers) {
200 proj.addAll(l.getProjections());
201 }
202 i.setServerProjections(proj);
203 }
204 return i;
205 }
206
207 private List<LayerDetails> parseLayers(List<Element> children, Set<String> parentCrs) {
208 List<LayerDetails> details = new ArrayList<LayerDetails>(children.size());
209 for (Element element : children) {
210 details.add(parseLayer(element, parentCrs));
211 }
212 return details;
213 }
214
215 private LayerDetails parseLayer(Element element, Set<String> parentCrs) {
216 String name = getChildContent(element, "Title", null, null);
217 String ident = getChildContent(element, "Name", null, null);
218
219 // The set of supported CRS/SRS for this layer
220 Set<String> crsList = new HashSet<String>();
221 // ...including this layer's already-parsed parent projections
222 crsList.addAll(parentCrs);
223
224 // Parse the CRS/SRS pulled out of this layer's XML element
225 // I think CRS and SRS are the same at this point
226 List<Element> crsChildren = getChildren(element, "CRS");
227 crsChildren.addAll(getChildren(element, "SRS"));
228 for (Element child : crsChildren) {
229 String crs = (String) getContent(child);
230 if (!crs.isEmpty()) {
231 String upperCase = crs.trim().toUpperCase();
232 crsList.add(upperCase);
233 }
234 }
235
236 // Check to see if any of the specified projections are supported by JOSM
237 boolean josmSupportsThisLayer = false;
238 for (String crs : crsList) {
239 josmSupportsThisLayer |= isProjSupported(crs);
240 }
241
242 Bounds bounds = null;
243 Element bboxElem = getChild(element, "EX_GeographicBoundingBox");
244 if (bboxElem != null) {
245 // Attempt to use EX_GeographicBoundingBox for bounding box
246 double left = Double.parseDouble(getChildContent(bboxElem, "westBoundLongitude", null, null));
247 double top = Double.parseDouble(getChildContent(bboxElem, "northBoundLatitude", null, null));
248 double right = Double.parseDouble(getChildContent(bboxElem, "eastBoundLongitude", null, null));
249 double bot = Double.parseDouble(getChildContent(bboxElem, "southBoundLatitude", null, null));
250 bounds = new Bounds(bot, left, top, right);
251 } else {
252 // If that's not available, try LatLonBoundingBox
253 bboxElem = getChild(element, "LatLonBoundingBox");
254 if (bboxElem != null) {
255 double left = Double.parseDouble(bboxElem.getAttribute("minx"));
256 double top = Double.parseDouble(bboxElem.getAttribute("maxy"));
257 double right = Double.parseDouble(bboxElem.getAttribute("maxx"));
258 double bot = Double.parseDouble(bboxElem.getAttribute("miny"));
259 bounds = new Bounds(bot, left, top, right);
260 }
261 }
262
263 List<Element> layerChildren = getChildren(element, "Layer");
264 List<LayerDetails> childLayers = parseLayers(layerChildren, crsList);
265
266 return new LayerDetails(name, ident, crsList, josmSupportsThisLayer, bounds, childLayers);
267 }
268
269 private boolean isProjSupported(String crs) {
270 for (ProjectionChoice pc : ProjectionPreference.getProjectionChoices()) {
271 if (pc.getPreferencesFromCode(crs) != null) return true;
272 }
273 return false;
274 }
275
276 private static String getChildContent(Element parent, String name, String missing, String empty) {
277 Element child = getChild(parent, name);
278 if (child == null)
279 return missing;
280 else {
281 String content = (String) getContent(child);
282 return (!content.isEmpty()) ? content : empty;
283 }
284 }
285
286 private static Object getContent(Element element) {
287 NodeList nl = element.getChildNodes();
288 StringBuilder content = new StringBuilder();
289 for (int i = 0; i < nl.getLength(); i++) {
290 Node node = nl.item(i);
291 switch (node.getNodeType()) {
292 case Node.ELEMENT_NODE:
293 return node;
294 case Node.CDATA_SECTION_NODE:
295 case Node.TEXT_NODE:
296 content.append(node.getNodeValue());
297 break;
298 }
299 }
300 return content.toString().trim();
301 }
302
303 private static List<Element> getChildren(Element parent, String name) {
304 List<Element> retVal = new ArrayList<Element>();
305 for (Node child = parent.getFirstChild(); child != null; child = child.getNextSibling()) {
306 if (child instanceof Element && name.equals(child.getNodeName())) {
307 retVal.add((Element) child);
308 }
309 }
310 return retVal;
311 }
312
313 private static Element getChild(Element parent, String name) {
314 if (parent == null)
315 return null;
316 for (Node child = parent.getFirstChild(); child != null; child = child.getNextSibling()) {
317 if (child instanceof Element && name.equals(child.getNodeName()))
318 return (Element) child;
319 }
320 return null;
321 }
322
323 public static class LayerDetails {
324
325 public final String name;
326 public final String ident;
327 public final List<LayerDetails> children;
328 public final Bounds bounds;
329 public final Set<String> crsList;
330 public final boolean supported;
331
332 public LayerDetails(String name, String ident, Set<String> crsList,
333 boolean supportedLayer, Bounds bounds,
334 List<LayerDetails> childLayers) {
335 this.name = name;
336 this.ident = ident;
337 this.supported = supportedLayer;
338 this.children = childLayers;
339 this.bounds = bounds;
340 this.crsList = crsList;
341 }
342
343 public boolean isSupported() {
344 return this.supported;
345 }
346
347 public Set<String> getProjections() {
348 return crsList;
349 }
350
351 @Override
352 public String toString() {
353 if (this.name == null || this.name.isEmpty())
354 return this.ident;
355 else
356 return this.name;
357 }
358
359 }
360}
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