/**
* Returns the list of elevation values for the specified typeInfo based on the dimension
* representation: all values for {@link DimensionPresentation#LIST}, otherwise min and max
*
* @param typeInfo
* @return
* @throws IOException
*/
public TreeSet<Double> getFeatureTypeElevations(FeatureTypeInfo typeInfo) throws IOException {
// grab the time metadata
DimensionInfo elevation =
typeInfo.getMetadata().get(ResourceInfo.ELEVATION, DimensionInfo.class);
if (elevation == null || !elevation.isEnabled()) {
throw new ServiceException(
"Layer " + typeInfo.getPrefixedName() + " does not have elevation support enabled");
}
FeatureCollection collection = getDimensionCollection(typeInfo, elevation);
TreeSet<Double> result = new TreeSet<Double>();
if (elevation.getPresentation() == DimensionPresentation.LIST
|| (elevation.getPresentation() == DimensionPresentation.DISCRETE_INTERVAL
&& elevation.getResolution() == null)) {
final UniqueVisitor visitor = new UniqueVisitor(elevation.getAttribute());
collection.accepts(visitor, null);
@SuppressWarnings("unchecked")
Set<Object> values = visitor.getUnique();
if (values.size() <= 0) {
result = null;
} else {
for (Object value : values) {
result.add(((Number) value).doubleValue());
}
}
} else {
final MinVisitor min = new MinVisitor(elevation.getAttribute());
collection.accepts(min, null);
// check calcresult first to avoid potential IllegalStateException if no features are in
// collection
CalcResult calcResult = min.getResult();
if (calcResult != CalcResult.NULL_RESULT) {
result.add(((Number) min.getMin()).doubleValue());
final MaxVisitor max = new MaxVisitor(elevation.getAttribute());
collection.accepts(max, null);
result.add(((Number) max.getMax()).doubleValue());
}
}
return result;
}
