/**
* Handles a {@link GetFeature} request by delegating the contained {@link Query} objects to
* different Threads.
*
* <p>If at least one query fails an exception will be thrown and all running threads will be
* stopped.
*
* @param getFeature
* @return result of the request
* @throws OGCWebServiceException
*/
FeatureResult handleRequest(GetFeature getFeature) throws OGCWebServiceException {
LOG.entering();
if (getFeature.getMaxFeatures() > maxFeatures) {
getFeature.setMaxFeatures(maxFeatures);
}
LOG.logDebug("maxFeatures " + getFeature.getMaxFeatures());
Query[] queries = getFeature.getQuery();
List<Callable<FeatureCollection>> queryTasks =
new ArrayList<Callable<FeatureCollection>>(queries.length);
for (Query query : queries) {
QualifiedName[] ftNames = query.getTypeNames();
// TODO joins between feature types
if (ftNames.length > 1) {
String msg =
"Multiple feature types in a Query (joins over feature types) "
+ "are not the supported by this WFS implementation.";
throw new OGCWebServiceException(this.getClass().getName(), msg);
}
QualifiedName ftName = ftNames[0];
MappedFeatureType ft = this.service.getMappedFeatureType(ftName);
if (ft == null) {
String msg = Messages.getMessage("WFS_FEATURE_TYPE_UNKNOWN", ftName);
throw new OGCWebServiceException(this.getClass().getName(), msg);
}
if (!ft.isVisible()) {
String msg = Messages.getMessage("WFS_FEATURE_TYPE_INVISIBLE", ftName);
throw new OGCWebServiceException(this.getClass().getName(), msg);
}
// check and normalized requested SRS
String srsName = query.getSrsName();
if (srsName != null) {
WFSFeatureType wfsFT =
this.service.getCapabilities().getFeatureTypeList().getFeatureType(ftName);
String normalizedSrsName = normalizeSrsName(srsName);
query.setSrsName(normalizedSrsName);
if (!(wfsFT.supportsSrs(normalizedSrsName))) {
String msg = Messages.getMessage("WFS_FEATURE_TYPE_SRS_UNSUPPORTED", ftName, srsName);
throw new OGCWebServiceException(this.getClass().getName(), msg);
}
}
QueryTask task = new QueryTask(query, ft);
queryTasks.add(task);
}
WFSConfiguration conf = (WFSConfiguration) service.getCapabilities();
long timeout = conf.getDeegreeParams().getRequestTimeLimit() * 1000;
if (timeout > MAX_TIMEOUT_MILLIS) {
// limit max timeout
timeout = MAX_TIMEOUT_MILLIS;
}
List<ExecutionFinishedEvent<FeatureCollection>> finishedEvents = null;
try {
finishedEvents = Executor.getInstance().performSynchronously(queryTasks, timeout);
} catch (InterruptedException e) {
String msg = "Exception occured while waiting for the GetFeature results: " + e.getMessage();
throw new OGCWebServiceException(this.getClass().getName(), msg);
}
// use id of the request as id of the result feature collection
// to allow identification of the original request that produced
// the feature collection
FeatureCollection fc = null;
if (getFeature.getResultType() == RESULT_TYPE.RESULTS) {
fc = mergeResults(getFeature.getId(), finishedEvents);
} else {
fc = mergeHits(getFeature.getId(), finishedEvents);
}
FeatureResult fr = new FeatureResult(getFeature, fc);
LOG.exiting();
return fr;
}
/**
* Appends the XML representation of the given <code>Query</code> to an element.
*
* @param query
*/
private static void appendQuery(Element root, Query query)
throws IOException, XMLParsingException {
Element queryElem = XMLTools.appendElement(root, WFS, "wfs:Query");
if (query.getHandle() != null) {
queryElem.setAttribute("handle", query.getHandle());
}
if (query.getFeatureVersion() != null) {
queryElem.setAttribute("featureVersion", query.getFeatureVersion());
}
QualifiedName[] qn = query.getTypeNames();
String[] na = new String[qn.length];
for (int i = 0; i < na.length; i++) {
na[i] = qn[i].getAsString();
queryElem.setAttribute("xmlns:" + qn[i].getPrefix(), qn[i].getNamespace().toASCIIString());
}
String tn = StringTools.arrayToString(na, ',');
queryElem.setAttribute("typeName", tn);
PropertyPath[] propertyNames = query.getPropertyNames();
for (int i = 0; i < propertyNames.length; i++) {
Element propertyNameElement = XMLTools.appendElement(queryElem, WFS, "wfs:PropertyName");
appendPropertyPath(propertyNameElement, propertyNames[i]);
}
Function[] fn = query.getFunctions();
// copy function definitions into query node
if (fn != null) {
for (int i = 0; i < fn.length; i++) {
StringReader sr = new StringReader(fn[i].toXML().toString());
Document doc;
try {
doc = XMLTools.parse(sr);
} catch (SAXException e) {
throw new XMLParsingException("could not parse filter function", e);
}
XMLTools.copyNode(doc.getDocumentElement(), queryElem);
}
}
// copy filter into query node
if (query.getFilter() != null) {
StringReader sr = new StringReader(query.getFilter().toXML().toString());
Document doc;
try {
doc = XMLTools.parse(sr);
} catch (SAXException e) {
throw new XMLParsingException("could not parse filter", e);
}
Element elem = XMLTools.appendElement(queryElem, OGCNS, "ogc:Filter");
XMLTools.copyNode(doc.getDocumentElement(), elem);
}
SortProperty[] sp = query.getSortProperties();
if (sp != null) {
Element sortBy = XMLTools.appendElement(queryElem, OGCNS, "ogc:SortBy");
for (int i = 0; i < sp.length; i++) {
Element sortProp = XMLTools.appendElement(sortBy, OGCNS, "ogc:SortProperty");
XMLTools.appendElement(
sortProp, OGCNS, "ogc:PropertyName", sp[i].getSortProperty().getAsString());
if (!sp[i].getSortOrder()) {
XMLTools.appendElement(sortBy, OGCNS, "ogc:SortOrder", "DESC");
}
}
}
}