public Double[] getLayerExtremeElevations(WMSCapabilities caps, String[] layerNames) {
if (caps == null) {
String message = Logging.getMessage("nullValue.WMSCapabilities");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (layerNames == null) {
String message = Logging.getMessage("nullValue.WMSLayerNames");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Double extremeMin = null;
Double extremeMax = null;
for (String name : layerNames) {
WMSLayerCapabilities layer = caps.getLayerByName(name);
if (layer == null) continue;
Double min = layer.getExtremeElevationMin();
if (min != null && (extremeMin == null || min.compareTo(min) > 0)) extremeMin = min;
Double max = layer.getExtremeElevationMax();
if (max != null && (extremeMax == null || max.compareTo(max) > 0)) extremeMax = max;
}
if (extremeMin != null || extremeMax != null) {
Double[] extremes = new Double[] {null, null};
if (extremeMin != null) extremes[0] = extremeMin;
if (extremeMax != null) extremes[1] = extremeMax;
return extremes;
}
return null;
}
