source: josm/trunk/src/org/openstreetmap/josm/io/MultiFetchServerObjectReader.java@ 15735

Last change on this file since 15735 was 15717, checked in by simon04, 6 years ago

Java 8: use Collectors.joining
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1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.io;
3
4import static org.openstreetmap.josm.tools.I18n.tr;
5import static org.openstreetmap.josm.tools.I18n.trn;
6
7import java.io.IOException;
8import java.io.InputStream;
9import java.net.HttpURLConnection;
10import java.util.ArrayList;
11import java.util.Collection;
12import java.util.Collections;
13import java.util.HashSet;
14import java.util.Iterator;
15import java.util.LinkedHashSet;
16import java.util.List;
17import java.util.Set;
18import java.util.concurrent.Callable;
19import java.util.concurrent.CompletionService;
20import java.util.concurrent.ExecutionException;
21import java.util.concurrent.ExecutorCompletionService;
22import java.util.concurrent.ExecutorService;
23import java.util.concurrent.Executors;
24import java.util.concurrent.Future;
25import java.util.stream.Collectors;
26
27import org.openstreetmap.josm.data.osm.DataSet;
28import org.openstreetmap.josm.data.osm.DataSetMerger;
29import org.openstreetmap.josm.data.osm.Node;
30import org.openstreetmap.josm.data.osm.OsmPrimitive;
31import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
32import org.openstreetmap.josm.data.osm.PrimitiveId;
33import org.openstreetmap.josm.data.osm.Relation;
34import org.openstreetmap.josm.data.osm.RelationMember;
35import org.openstreetmap.josm.data.osm.SimplePrimitiveId;
36import org.openstreetmap.josm.data.osm.Way;
37import org.openstreetmap.josm.gui.progress.NullProgressMonitor;
38import org.openstreetmap.josm.gui.progress.ProgressMonitor;
39import org.openstreetmap.josm.spi.preferences.Config;
40import org.openstreetmap.josm.tools.Logging;
41import org.openstreetmap.josm.tools.Utils;
42
43/**
44 * Retrieves a set of {@link OsmPrimitive}s from an OSM server using the so called
45 * Multi Fetch API.
46 *
47 * Usage:
48 * <pre>
49 * MultiFetchServerObjectReader reader = MultiFetchServerObjectReader()
50 * .append(2345,2334,4444)
51 * .append(new Node(72343));
52 * reader.parseOsm();
53 * if (!reader.getMissingPrimitives().isEmpty()) {
54 * Logging.info("There are missing primitives: " + reader.getMissingPrimitives());
55 * }
56 * if (!reader.getSkippedWays().isEmpty()) {
57 * Logging.info("There are skipped ways: " + reader.getMissingPrimitives());
58 * }
59 * </pre>
60 */
61public class MultiFetchServerObjectReader extends OsmServerReader {
62 /**
63 * the max. number of primitives retrieved in one step. Assuming IDs with 10 digits,
64 * this leads to a max. request URL of ~ 1900 Bytes ((10 digits + 1 Separator) * 170),
65 * which should be safe according to the
66 * <a href="http://www.boutell.com/newfaq/misc/urllength.html">WWW FAQ</a>.
67 */
68 private static final int MAX_IDS_PER_REQUEST = 170;
69
70 private final Set<Long> nodes;
71 private final Set<Long> ways;
72 private final Set<Long> relations;
73 private Set<PrimitiveId> missingPrimitives;
74 private final DataSet outputDataSet;
75
76 /**
77 * Constructs a {@code MultiFetchServerObjectReader}.
78 */
79 protected MultiFetchServerObjectReader() {
80 nodes = new LinkedHashSet<>();
81 ways = new LinkedHashSet<>();
82 relations = new LinkedHashSet<>();
83 this.outputDataSet = new DataSet();
84 this.missingPrimitives = new LinkedHashSet<>();
85 }
86
87 /**
88 * Creates a new instance of {@link MultiFetchServerObjectReader} or {@link MultiFetchOverpassObjectReader}
89 * depending on the {@link OverpassDownloadReader#FOR_MULTI_FETCH preference}.
90 *
91 * @return a new instance
92 * @since 9241
93 */
94 public static MultiFetchServerObjectReader create() {
95 return create(OverpassDownloadReader.FOR_MULTI_FETCH.get());
96 }
97
98 /**
99 * Creates a new instance of {@link MultiFetchServerObjectReader} or {@link MultiFetchOverpassObjectReader}
100 * depending on the {@code fromMirror} parameter.
101 *
102 * @param fromMirror {@code false} for {@link MultiFetchServerObjectReader}, {@code true} for {@link MultiFetchOverpassObjectReader}
103 * @return a new instance
104 * @since 15520 (changed visibility)
105 */
106 public static MultiFetchServerObjectReader create(final boolean fromMirror) {
107 if (fromMirror) {
108 return new MultiFetchOverpassObjectReader();
109 } else {
110 return new MultiFetchServerObjectReader();
111 }
112 }
113
114 /**
115 * Remembers an {@link OsmPrimitive}'s id. The id will
116 * later be fetched as part of a Multi Get request.
117 *
118 * Ignore the id if it represents a new primitives.
119 *
120 * @param id the id
121 */
122 protected void remember(PrimitiveId id) {
123 if (id.isNew()) return;
124 switch(id.getType()) {
125 case NODE: nodes.add(id.getUniqueId()); break;
126 case WAY: ways.add(id.getUniqueId()); break;
127 case RELATION: relations.add(id.getUniqueId()); break;
128 default: throw new AssertionError();
129 }
130 }
131
132 /**
133 * appends a {@link OsmPrimitive} id to the list of ids which will be fetched from the server.
134 *
135 * @param ds the {@link DataSet} to which the primitive belongs
136 * @param id the primitive id
137 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
138 * {@link OsmPrimitiveType#RELATION RELATION}
139 * @return this
140 */
141 public MultiFetchServerObjectReader append(DataSet ds, long id, OsmPrimitiveType type) {
142 OsmPrimitive p = ds.getPrimitiveById(id, type);
143 switch(type) {
144 case NODE:
145 return appendNode((Node) p);
146 case WAY:
147 return appendWay((Way) p);
148 case RELATION:
149 return appendRelation((Relation) p);
150 default:
151 return this;
152 }
153 }
154
155 /**
156 * appends a {@link Node} id to the list of ids which will be fetched from the server.
157 *
158 * @param node the node (ignored, if null)
159 * @return this
160 */
161 public MultiFetchServerObjectReader appendNode(Node node) {
162 if (node == null) return this;
163 remember(node.getPrimitiveId());
164 return this;
165 }
166
167 /**
168 * appends a {@link Way} id and the list of ids of nodes the way refers to the list of ids which will be fetched from the server.
169 *
170 * @param way the way (ignored, if null)
171 * @return this
172 */
173 public MultiFetchServerObjectReader appendWay(Way way) {
174 if (way == null) return this;
175 if (way.isNew()) return this;
176 for (Node node: !recursesDown() ? way.getNodes() : Collections.<Node>emptyList()) {
177 if (!node.isNew()) {
178 remember(node.getPrimitiveId());
179 }
180 }
181 remember(way.getPrimitiveId());
182 return this;
183 }
184
185 /**
186 * appends a {@link Relation} id to the list of ids which will be fetched from the server.
187 *
188 * @param relation the relation (ignored, if null)
189 * @return this
190 */
191 protected MultiFetchServerObjectReader appendRelation(Relation relation) {
192 if (relation == null) return this;
193 if (relation.isNew()) return this;
194 remember(relation.getPrimitiveId());
195 for (RelationMember member : !recursesDown() ? relation.getMembers() : Collections.<RelationMember>emptyList()) {
196 // avoid infinite recursion in case of cyclic dependencies in relations
197 if (OsmPrimitiveType.from(member.getMember()) == OsmPrimitiveType.RELATION
198 && relations.contains(member.getMember().getId())) {
199 continue;
200 }
201 if (!member.getMember().isIncomplete()) {
202 append(member.getMember());
203 }
204 }
205 return this;
206 }
207
208 /**
209 * appends an {@link OsmPrimitive} to the list of ids which will be fetched from the server.
210 * @param primitive the primitive
211 * @return this
212 */
213 public MultiFetchServerObjectReader append(OsmPrimitive primitive) {
214 if (primitive instanceof Node) {
215 return appendNode((Node) primitive);
216 } else if (primitive instanceof Way) {
217 return appendWay((Way) primitive);
218 } else if (primitive instanceof Relation) {
219 return appendRelation((Relation) primitive);
220 }
221 return this;
222 }
223
224 /**
225 * appends a list of {@link OsmPrimitive} to the list of ids which will be fetched from the server.
226 *
227 * @param primitives the list of primitives (ignored, if null)
228 * @return this
229 *
230 * @see #append(OsmPrimitive)
231 */
232 public MultiFetchServerObjectReader append(Collection<? extends OsmPrimitive> primitives) {
233 if (primitives == null) return this;
234 for (OsmPrimitive primitive : primitives) {
235 append(primitive);
236 }
237 return this;
238 }
239
240 /**
241 * extracts a subset of max {@link #MAX_IDS_PER_REQUEST} ids from <code>ids</code> and
242 * replies the subset. The extracted subset is removed from <code>ids</code>.
243 *
244 * @param ids a set of ids
245 * @return the subset of ids
246 */
247 protected Set<Long> extractIdPackage(Set<Long> ids) {
248 Set<Long> pkg = new HashSet<>();
249 if (ids.isEmpty())
250 return pkg;
251 if (ids.size() > MAX_IDS_PER_REQUEST) {
252 Iterator<Long> it = ids.iterator();
253 for (int i = 0; i < MAX_IDS_PER_REQUEST; i++) {
254 pkg.add(it.next());
255 }
256 ids.removeAll(pkg);
257 } else {
258 pkg.addAll(ids);
259 ids.clear();
260 }
261 return pkg;
262 }
263
264 /**
265 * builds the Multi Get request string for a set of ids and a given {@link OsmPrimitiveType}.
266 *
267 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
268 * {@link OsmPrimitiveType#RELATION RELATION}
269 * @param idPackage the package of ids
270 * @return the request string
271 */
272 protected String buildRequestString(final OsmPrimitiveType type, Set<Long> idPackage) {
273 return type.getAPIName() + "s?" + type.getAPIName() + "s=" + idPackage.stream().map(String::valueOf).collect(Collectors.joining(","));
274 }
275
276 protected void rememberNodesOfIncompleteWaysToLoad(DataSet from) {
277 for (Way w: from.getWays()) {
278 if (w.hasIncompleteNodes()) {
279 for (Node n: w.getNodes()) {
280 if (n.isIncomplete()) {
281 nodes.add(n.getId());
282 }
283 }
284 }
285 }
286 }
287
288 /**
289 * merges the dataset <code>from</code> to {@link #outputDataSet}.
290 *
291 * @param from the other dataset
292 */
293 protected void merge(DataSet from) {
294 final DataSetMerger visitor = new DataSetMerger(outputDataSet, from);
295 visitor.merge();
296 }
297
298 /**
299 * fetches a set of ids of a given {@link OsmPrimitiveType} from the server
300 *
301 * @param ids the set of ids
302 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
303 * {@link OsmPrimitiveType#RELATION RELATION}
304 * @param progressMonitor progress monitor
305 * @throws OsmTransferException if an error occurs while communicating with the API server
306 */
307 protected void fetchPrimitives(Set<Long> ids, OsmPrimitiveType type, ProgressMonitor progressMonitor) throws OsmTransferException {
308 String msg;
309 final String baseUrl = getBaseUrl();
310 switch (type) {
311 // CHECKSTYLE.OFF: SingleSpaceSeparator
312 case NODE: msg = tr("Fetching a package of nodes from ''{0}''", baseUrl); break;
313 case WAY: msg = tr("Fetching a package of ways from ''{0}''", baseUrl); break;
314 case RELATION: msg = tr("Fetching a package of relations from ''{0}''", baseUrl); break;
315 // CHECKSTYLE.ON: SingleSpaceSeparator
316 default: throw new AssertionError();
317 }
318 progressMonitor.setTicksCount(ids.size());
319 progressMonitor.setTicks(0);
320 // The complete set containing all primitives to fetch
321 Set<Long> toFetch = new HashSet<>(ids);
322 // Build a list of fetchers that will download smaller sets containing only MAX_IDS_PER_REQUEST (200) primitives each.
323 // we will run up to MAX_DOWNLOAD_THREADS concurrent fetchers.
324 int threadsNumber = Config.getPref().getInt("osm.download.threads", OsmApi.MAX_DOWNLOAD_THREADS);
325 threadsNumber = Utils.clamp(threadsNumber, 1, OsmApi.MAX_DOWNLOAD_THREADS);
326 final ExecutorService exec = Executors.newFixedThreadPool(
327 threadsNumber, Utils.newThreadFactory(getClass() + "-%d", Thread.NORM_PRIORITY));
328 CompletionService<FetchResult> ecs = new ExecutorCompletionService<>(exec);
329 List<Future<FetchResult>> jobs = new ArrayList<>();
330 while (!toFetch.isEmpty()) {
331 jobs.add(ecs.submit(new Fetcher(type, extractIdPackage(toFetch), progressMonitor)));
332 }
333 // Run the fetchers
334 for (int i = 0; i < jobs.size() && !isCanceled(); i++) {
335 progressMonitor.subTask(msg + "... " + progressMonitor.getTicks() + '/' + progressMonitor.getTicksCount());
336 try {
337 FetchResult result = ecs.take().get();
338 if (result.rc404 != null) {
339 List<Long> toSplit = new ArrayList<>(result.rc404);
340 int n = toSplit.size() / 2;
341 jobs.add(ecs.submit(new Fetcher(type, new HashSet<>(toSplit.subList(0, n)), progressMonitor)));
342 jobs.add(ecs.submit(new Fetcher(type, new HashSet<>(toSplit.subList(n, toSplit.size())), progressMonitor)));
343 }
344 if (result.missingPrimitives != null) {
345 missingPrimitives.addAll(result.missingPrimitives);
346 }
347 if (result.dataSet != null && !isCanceled()) {
348 rememberNodesOfIncompleteWaysToLoad(result.dataSet);
349 merge(result.dataSet);
350 }
351 } catch (InterruptedException | ExecutionException e) {
352 Logging.error(e);
353 }
354 }
355 exec.shutdown();
356 // Cancel requests if the user chose to
357 if (isCanceled()) {
358 for (Future<FetchResult> job : jobs) {
359 job.cancel(true);
360 }
361 }
362 }
363
364 /**
365 * invokes one or more Multi Gets to fetch the {@link OsmPrimitive}s and replies
366 * the dataset of retrieved primitives. Note that the dataset includes non visible primitives too!
367 * In contrast to a simple Get for a node, a way, or a relation, a Multi Get always replies
368 * the latest version of the primitive (if any), even if the primitive is not visible (i.e. if
369 * visible==false).
370 *
371 * Invoke {@link #getMissingPrimitives()} to get a list of primitives which have not been
372 * found on the server (the server response code was 404)
373 *
374 * @return the parsed data
375 * @throws OsmTransferException if an error occurs while communicating with the API server
376 * @see #getMissingPrimitives()
377 *
378 */
379 @Override
380 public DataSet parseOsm(ProgressMonitor progressMonitor) throws OsmTransferException {
381 int n = nodes.size() + ways.size() + relations.size();
382 progressMonitor.beginTask(trn("Downloading {0} object from ''{1}''",
383 "Downloading {0} objects from ''{1}''", n, n, OsmApi.getOsmApi().getBaseUrl()));
384 try {
385 missingPrimitives = new HashSet<>();
386 if (isCanceled()) return null;
387 fetchPrimitives(ways, OsmPrimitiveType.WAY, progressMonitor);
388 if (isCanceled()) return null;
389 fetchPrimitives(nodes, OsmPrimitiveType.NODE, progressMonitor);
390 if (isCanceled()) return null;
391 fetchPrimitives(relations, OsmPrimitiveType.RELATION, progressMonitor);
392 if (outputDataSet != null) {
393 outputDataSet.deleteInvisible();
394 }
395 return outputDataSet;
396 } finally {
397 progressMonitor.finishTask();
398 }
399 }
400
401 /**
402 * replies the set of ids of all primitives for which a fetch request to the
403 * server was submitted but which are not available from the server (the server
404 * replied a return code of 404)
405 *
406 * @return the set of ids of missing primitives
407 */
408 public Set<PrimitiveId> getMissingPrimitives() {
409 return missingPrimitives;
410 }
411
412 /**
413 * Whether this reader fetches nodes when loading ways, or members when loading relations.
414 *
415 * @return {@code true} if the reader recurses down
416 */
417 protected boolean recursesDown() {
418 return false;
419 }
420
421 /**
422 * The class holding the results given by {@link Fetcher}.
423 * It is only a wrapper of the resulting {@link DataSet} and the collection of {@link PrimitiveId} that could not have been loaded.
424 */
425 protected static class FetchResult {
426
427 /**
428 * The resulting data set
429 */
430 public final DataSet dataSet;
431
432 /**
433 * The collection of primitive ids that could not have been loaded
434 */
435 public final Set<PrimitiveId> missingPrimitives;
436
437 private Set<Long> rc404;
438
439 /**
440 * Constructs a {@code FetchResult}
441 * @param dataSet The resulting data set
442 * @param missingPrimitives The collection of primitive ids that could not have been loaded
443 */
444 public FetchResult(DataSet dataSet, Set<PrimitiveId> missingPrimitives) {
445 this.dataSet = dataSet;
446 this.missingPrimitives = missingPrimitives;
447 }
448 }
449
450 /**
451 * The class that actually download data from OSM API.
452 * Several instances of this class are used by {@link MultiFetchServerObjectReader} (one per set of primitives to fetch).
453 * The inheritance of {@link OsmServerReader} is only explained by the need to have a distinct OSM connection by {@code Fetcher} instance.
454 * @see FetchResult
455 */
456 protected class Fetcher extends OsmServerReader implements Callable<FetchResult> {
457
458 private final Set<Long> pkg;
459 private final OsmPrimitiveType type;
460 private final ProgressMonitor progressMonitor;
461
462 /**
463 * Constructs a {@code Fetcher}
464 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
465 * {@link OsmPrimitiveType#RELATION RELATION}
466 * @param idsPackage The set of primitives ids to fetch
467 * @param progressMonitor The progress monitor
468 */
469 public Fetcher(OsmPrimitiveType type, Set<Long> idsPackage, ProgressMonitor progressMonitor) {
470 this.pkg = idsPackage;
471 this.type = type;
472 this.progressMonitor = progressMonitor;
473 }
474
475 @Override
476 public DataSet parseOsm(ProgressMonitor progressMonitor) throws OsmTransferException {
477 // This method is implemented because of the OsmServerReader inheritance, but not used,
478 // as the main target of this class is the call() method.
479 return fetch(progressMonitor).dataSet;
480 }
481
482 @Override
483 public FetchResult call() throws Exception {
484 return fetch(progressMonitor);
485 }
486
487 /**
488 * fetches the requested primitives and updates the specified progress monitor.
489 * @param progressMonitor the progress monitor
490 * @return the {@link FetchResult} of this operation
491 * @throws OsmTransferException if an error occurs while communicating with the API server
492 */
493 protected FetchResult fetch(ProgressMonitor progressMonitor) throws OsmTransferException {
494 try {
495 return multiGetIdPackage(type, pkg, progressMonitor);
496 } catch (OsmApiException e) {
497 if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
498 if (pkg.size() > 4) {
499 FetchResult res = new FetchResult(null, null);
500 res.rc404 = pkg;
501 return res;
502 }
503 Logging.info(tr("Server replied with response code 404, retrying with an individual request for each object."));
504 return singleGetIdPackage(type, pkg, progressMonitor);
505 } else {
506 throw e;
507 }
508 }
509 }
510
511 @Override
512 protected String getBaseUrl() {
513 return MultiFetchServerObjectReader.this.getBaseUrl();
514 }
515
516 /**
517 * invokes a Multi Get for a set of ids and a given {@link OsmPrimitiveType}.
518 * The retrieved primitives are merged to {@link #outputDataSet}.
519 *
520 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
521 * {@link OsmPrimitiveType#RELATION RELATION}
522 * @param pkg the package of ids
523 * @param progressMonitor progress monitor
524 * @return the {@link FetchResult} of this operation
525 * @throws OsmTransferException if an error occurs while communicating with the API server
526 */
527 protected FetchResult multiGetIdPackage(OsmPrimitiveType type, Set<Long> pkg, ProgressMonitor progressMonitor)
528 throws OsmTransferException {
529 String request = buildRequestString(type, pkg);
530 FetchResult result = null;
531 try (InputStream in = getInputStream(request, NullProgressMonitor.INSTANCE)) {
532 if (in == null) return null;
533 progressMonitor.subTask(tr("Downloading OSM data..."));
534 try {
535 result = new FetchResult(OsmReader.parseDataSet(in, progressMonitor.createSubTaskMonitor(pkg.size(), false)), null);
536 } catch (IllegalDataException e) {
537 throw new OsmTransferException(e);
538 }
539 } catch (IOException ex) {
540 Logging.warn(ex);
541 }
542 return result;
543 }
544
545 /**
546 * invokes a Multi Get for a single id and a given {@link OsmPrimitiveType}.
547 * The retrieved primitive is merged to {@link #outputDataSet}.
548 *
549 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
550 * {@link OsmPrimitiveType#RELATION RELATION}
551 * @param id the id
552 * @param progressMonitor progress monitor
553 * @return the {@link DataSet} resulting of this operation
554 * @throws OsmTransferException if an error occurs while communicating with the API server
555 */
556 protected DataSet singleGetId(OsmPrimitiveType type, long id, ProgressMonitor progressMonitor) throws OsmTransferException {
557 String request = buildRequestString(type, Collections.singleton(id));
558 DataSet result = null;
559 try (InputStream in = getInputStream(request, NullProgressMonitor.INSTANCE)) {
560 if (in == null) return null;
561 progressMonitor.subTask(tr("Downloading OSM data..."));
562 try {
563 result = OsmReader.parseDataSet(in, progressMonitor.createSubTaskMonitor(1, false));
564 } catch (IllegalDataException e) {
565 throw new OsmTransferException(e);
566 }
567 } catch (IOException ex) {
568 Logging.warn(ex);
569 }
570 return result;
571 }
572
573 /**
574 * invokes a sequence of Multi Gets for individual ids in a set of ids and a given {@link OsmPrimitiveType}.
575 * The retrieved primitives are merged to {@link #outputDataSet}.
576 *
577 * This method is used if one of the ids in pkg doesn't exist (the server replies with return code 404).
578 * If the set is fetched with this method it is possible to find out which of the ids doesn't exist.
579 * Unfortunately, the server does not provide an error header or an error body for a 404 reply.
580 *
581 * @param type The primitive type. Must be one of {@link OsmPrimitiveType#NODE NODE}, {@link OsmPrimitiveType#WAY WAY},
582 * {@link OsmPrimitiveType#RELATION RELATION}
583 * @param pkg the set of ids
584 * @param progressMonitor progress monitor
585 * @return the {@link FetchResult} of this operation
586 * @throws OsmTransferException if an error occurs while communicating with the API server
587 */
588 protected FetchResult singleGetIdPackage(OsmPrimitiveType type, Set<Long> pkg, ProgressMonitor progressMonitor)
589 throws OsmTransferException {
590 FetchResult result = new FetchResult(new DataSet(), new HashSet<PrimitiveId>());
591 String baseUrl = OsmApi.getOsmApi().getBaseUrl();
592 for (long id : pkg) {
593 try {
594 String msg;
595 switch (type) {
596 // CHECKSTYLE.OFF: SingleSpaceSeparator
597 case NODE: msg = tr("Fetching node with id {0} from ''{1}''", id, baseUrl); break;
598 case WAY: msg = tr("Fetching way with id {0} from ''{1}''", id, baseUrl); break;
599 case RELATION: msg = tr("Fetching relation with id {0} from ''{1}''", id, baseUrl); break;
600 // CHECKSTYLE.ON: SingleSpaceSeparator
601 default: throw new AssertionError();
602 }
603 progressMonitor.setCustomText(msg);
604 result.dataSet.mergeFrom(singleGetId(type, id, progressMonitor));
605 } catch (OsmApiException e) {
606 if (e.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND) {
607 Logging.info(tr("Server replied with response code 404 for id {0}. Skipping.", Long.toString(id)));
608 result.missingPrimitives.add(new SimplePrimitiveId(id, type));
609 } else {
610 throw e;
611 }
612 }
613 }
614 return result;
615 }
616 }
617}
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