protected ContentFeatureCollection(ContentFeatureSource featureSource, Query query) {
this.featureSource = featureSource;
this.query = query;
// retype feature type if necessary
if (query.getPropertyNames() != Query.ALL_NAMES) {
this.featureType =
SimpleFeatureTypeBuilder.retype(featureSource.getSchema(), query.getPropertyNames());
} else {
this.featureType = featureSource.getSchema();
}
}
public ReferencedEnvelope getBounds() {
FeatureReader<SimpleFeatureType, SimpleFeature> reader = null;
try {
ReferencedEnvelope result = featureSource.getBounds(query);
if (result != null) {
return result;
}
// ops, we have to compute the results by hand. Let's load just the
// geometry attributes though
Query q = new Query(query);
List<String> geometries = new ArrayList<String>();
for (AttributeDescriptor ad : getSchema().getAttributeDescriptors()) {
if (ad instanceof GeometryDescriptor) {
geometries.add(ad.getLocalName());
}
}
// no geometries, no bounds
if (geometries.size() == 0) {
return new ReferencedEnvelope();
} else {
q.setPropertyNames(geometries);
}
// grab the features and scan through them
reader = featureSource.getReader(q);
while (reader.hasNext()) {
SimpleFeature f = reader.next();
ReferencedEnvelope featureBounds = ReferencedEnvelope.reference(f.getBounds());
if (result == null) {
result = featureBounds;
} else if (featureBounds != null) {
result.expandToInclude(featureBounds);
}
}
// return the results if we got any, or return an empty one otherwise
if (result != null) {
return result;
} else {
return new ReferencedEnvelope(getSchema().getCoordinateReferenceSystem());
}
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException ex) {
// we tried...
}
}
}
}
public Iterator iterator() {
try {
return new WrappingIterator(featureSource.getReader(query));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
/**
* Removes a listener for collection events.
*
* @param listener The listener to remove
*/
public void removeListener(CollectionListener listener) {
// as soon as the listeners are out we clean up
synchronized (listeners) {
listeners.remove(listener);
if (listeners.size() == 0) featureSource.removeFeatureListener(this.listener);
}
}
/**
* Adds a listener for collection events.
*
* @param listener The listener to add
*/
public void addListener(CollectionListener listener) {
// create the bridge only if we have collection listeners around
synchronized (listeners) {
if (listeners.size() == 0) {
featureSource.addFeatureListener(this.listener);
}
listeners.add(listener);
}
}
public int size() {
FeatureReader fr = null;
try {
int size = featureSource.getCount(query);
if (size >= 0) {
return size;
} else {
// we have to iterate, probably best if we do a minimal query that
// only loads a short attribute
AttributeDescriptor chosen = null;
for (AttributeDescriptor ad : getSchema().getAttributeDescriptors()) {
if (chosen == null || size(ad) < size(chosen)) {
chosen = ad;
}
}
// build the minimal query
Query q = new Query(query);
if (chosen != null) {
q.setPropertyNames(Collections.singletonList(chosen.getLocalName()));
}
// bean counting...
fr = featureSource.getReader(q);
int count = 0;
while (fr.hasNext()) {
fr.next();
count++;
}
return count;
}
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (fr != null) {
try {
fr.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
// Visitors
public void accepts(
org.opengis.feature.FeatureVisitor visitor, org.opengis.util.ProgressListener progress)
throws IOException {
featureSource.accepts(query, visitor, progress);
}
