public static <T extends FeatureType, F extends org.opengis.feature.Feature> void featuresToJson(
FeatureCollection<T, F> collection, JSONBuilder json, boolean returnGeometry)
throws IOException {
FeatureIterator<F> iterator = collection.features();
T schema = collection.getSchema();
json.object().key("objectIdFieldName").value("objectid").key("globalIdFieldName").value("");
if (returnGeometry) {
GeometryDescriptor geometryDescriptor = schema.getGeometryDescriptor();
if (geometryDescriptor == null)
throw new RuntimeException(
"No geometry descriptor for type " + schema + "; " + schema.getDescriptors());
GeometryType geometryType = geometryDescriptor.getType();
if (geometryType == null) throw new RuntimeException("No geometry type for type " + schema);
Class<?> binding = geometryType.getBinding();
if (binding == null) throw new RuntimeException("No binding for geometry type " + schema);
GeometryTypeEnum geometryTypeEnum = GeometryTypeEnum.forJTSClass(binding);
json.key("geometryType").value(geometryTypeEnum.getGeometryType());
}
if (schema.getCoordinateReferenceSystem() != null) {
try {
SpatialReference sr = SpatialReferences.fromCRS(schema.getCoordinateReferenceSystem());
json.key("spatialReference");
SpatialReferenceEncoder.toJson(sr, json);
} catch (FactoryException e) {
throw new RuntimeException(e);
}
}
json.key("fields").array();
for (PropertyDescriptor desc : schema.getDescriptors()) {
if (schema.getGeometryDescriptor() != null
&& !desc.getName().equals(schema.getGeometryDescriptor().getName())) {
descriptorToJson(desc, json);
}
}
json.endArray();
try {
json.key("features");
json.array();
while (iterator.hasNext()) {
F feature = iterator.next();
featureToJson(feature, json, returnGeometry);
}
json.endArray();
} finally {
iterator.close();
}
json.endObject();
}
public static <T extends FeatureType, F extends Feature> void featureIdSetToJson(
FeatureCollection<T, F> features, JSONBuilder json) {
json.object();
json.key("objectIdFieldName");
json.value("objectid"); // TODO: Advertise "real" identifier property
FeatureIterator<F> iterator = features.features();
try {
json.key("objectIds");
json.array();
while (iterator.hasNext()) {
F feature = iterator.next();
json.value(adaptId(feature.getIdentifier().getID()));
}
json.endArray();
} finally {
iterator.close();
}
json.endObject();
}