private List<ZGroupLayerPainter> buildLayerPainters(
Graphics2D graphics,
StreamingRenderer renderer,
String layerId,
ProgressListener cancellationListener)
throws IOException, FactoryException, NoninvertibleTransformException, SchemaException,
TransformException {
List<ZGroupLayerPainter> painters = new ArrayList<>();
boolean closePainters = true;
try {
for (Layer layer : layers) {
// get the LiteFeatureTypeStyle for this layer
final FeatureSource featureSource = layer.getFeatureSource();
if (featureSource == null) {
throw new IllegalArgumentException("The layer does not contain a feature source");
}
final FeatureType schema = featureSource.getSchema();
final ArrayList<LiteFeatureTypeStyle> lfts =
renderer.createLiteFeatureTypeStyles(layer, graphics, false);
if (lfts.isEmpty()) {
continue;
} else {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("Processing " + lfts.size() + " stylers for " + schema.getName());
}
}
// get the feature iterator we need
FeatureCollection features = renderer.getFeatures(layer, schema, lfts);
// While we could use a non mark feature iterator for single fts layers,
// that would cause multiple connections to be open at the same time,
// which in turn could cause deadlocks against connection pools, so we
// are going to build a MarkFeatureIterator regardless
// TODO: we could optimize down to simple streaming painting if we end up
// with a single painter with a single fts (due to scale dependencies)
// but we'd have to delay opening the MarkFeatureIterator to recognize the
// situation
int maxFeatures = SortedFeatureReader.getMaxFeaturesInMemory(layer.getQuery());
MarkFeatureIterator fi =
MarkFeatureIterator.create(features, maxFeatures, cancellationListener);
if (fi.hasNext()) {
ZGroupLayerPainter painter = new ZGroupLayerPainter(fi, lfts, renderer, layerId);
painters.add(painter);
} else {
fi.close();
}
}
// got to the end cleanly, no need to close the painters accumulated so far
closePainters = false;
} finally {
if (closePainters) {
for (ZGroupLayerPainter painter : painters) {
try {
painter.close();
} catch (Exception e) {
LOGGER.log(Level.FINE, "Failed to close cleanly layer painter " + painter, e);
}
}
}
}
validateSortBy(painters);
return painters;
}
