/** Read the configuration information from individual layers from the config file. */
private void readLayerConfig() {
for (Layer layer : this.getLayers()) // all the layers, scalars and vectors
{
// Load the Variable object from the config file or create a new
// one if it doesn't exist.
Variable var = this.getVariables().get(layer.getId());
if (var == null) {
var = new Variable();
var.setId(layer.getId());
this.addVariable(var);
}
// If there is no title set for this layer in the config file, we
// use the title that was read by the DataReader.
if (var.getTitle() == null) var.setTitle(layer.getTitle());
// Set the colour scale range. If this isn't specified in the
// config information, load an "educated guess" at the scale range
// from the source data.
if (var.getColorScaleRange() == null) {
this.appendLoadingProgress("Reading min-max data for layer " + layer.getName());
Range<Float> valueRange;
try {
valueRange = WmsUtils.estimateValueRange(layer);
if (valueRange.isEmpty()) {
// We failed to get a valid range. Just guess at a scale
valueRange = Ranges.newRange(-50.0f, 50.0f);
} else if (valueRange.getMinimum().equals(valueRange.getMaximum())) {
// This happens occasionally if the above algorithm happens
// to hit an area of uniform data. We make sure that
// the max is greater than the min.
valueRange = Ranges.newRange(valueRange.getMinimum(), valueRange.getMaximum() + 1.0f);
} else {
// Set the scale range of the layer, factoring in a 10% expansion
// to deal with the fact that the sample data we read might
// not be representative
float diff = valueRange.getMaximum() - valueRange.getMinimum();
valueRange =
Ranges.newRange(
valueRange.getMinimum() - 0.05f * diff, valueRange.getMaximum() + 0.05f * diff);
}
} catch (Exception e) {
logger.error(
"Error reading min-max from layer " + layer.getId() + " in dataset " + this.id, e);
valueRange = Ranges.newRange(-50.0f, 50.0f);
}
var.setColorScaleRange(valueRange);
}
}
}
private static Range<Float> getRange(Element parentElement, String childName)
throws WmsConfigException {
String str = parentElement.getChildTextTrim(childName);
if (str == null) return null;
String[] els = str.split(" ");
if (els.length != 2) {
throw new WmsConfigException("Invalid range format");
}
try {
float min = Float.parseFloat(els[0]);
float max = Float.parseFloat(els[1]);
return Ranges.newRange(min, max);
} catch (NumberFormatException nfe) {
throw new WmsConfigException("Invalid floating-point value in range");
}
}
LayerSettings(Element parentElement) throws WmsConfigException {
if (parentElement == null) return; // Create a set of layer settings with all-null fields
this.allowFeatureInfo = getBoolean(parentElement, "allowFeatureInfo");
this.defaultColorScaleRange = getRange(parentElement, "defaultColorScaleRange");
this.defaultPaletteName = parentElement.getChildTextTrim("defaultPaletteName");
// If the default palette name tag is used, it must be populated
// TODO: can we check this against the installed palettes?
if (this.defaultPaletteName != null && this.defaultPaletteName.isEmpty()) {
throw new WmsConfigException("defaultPaletteName must contain a value");
}
this.defaultNumColorBands =
getInteger(
parentElement,
"defaultNumColorBands",
Ranges.newRange(5, ColorPalette.MAX_NUM_COLOURS));
this.logScaling = getBoolean(parentElement, "logScaling");
}