/** * 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; }