private static void forceSRS(GetMapRequest getMap, String srs) {
getMap.setSRS(srs);
try {
getMap.setCrs(CRS.decode(srs));
} catch (NoSuchAuthorityCodeException e) {
e.printStackTrace();
} catch (FactoryException e) {
e.printStackTrace();
}
}
public static GetMapRequest autoSetMissingProperties(GetMapRequest getMap) {
// set the defaults
if (getMap.getFormat() == null) {
getMap.setFormat(FORMAT);
}
if ((getMap.getStyles() == null) || getMap.getStyles().isEmpty()) {
// set styles to be the defaults for the specified layers
// TODO: should this be part of core WMS logic? is so lets throw
// this
// into the GetMapKvpRequestReader
if ((getMap.getLayers() != null) && (getMap.getLayers().size() > 0)) {
ArrayList<Style> styles = new ArrayList<Style>(getMap.getLayers().size());
for (int i = 0; i < getMap.getLayers().size(); i++) {
styles.add(getMap.getLayers().get(i).getDefaultStyle());
}
getMap.setStyles(styles);
} else {
getMap.setStyles(STYLES);
}
}
// auto-magic missing info configuration
autoSetBoundsAndSize(getMap);
return getMap;
}
/**
* This method tries to automatically determine SRS, bounding box and output size based on the
* layers provided by the user and any other parameters.
*
* <p>If bounds are not specified by the user, they are automatically se to the union of the
* bounds of all layers.
*
* <p>The size of the output image defaults to 512 pixels, the height is automatically determined
* based on the width to height ratio of the requested layers. This is also true if either height
* or width are specified by the user. If both height and width are specified by the user, the
* automatically determined bounding box will be adjusted to fit inside these bounds.
*
* <p>General idea 1) Figure out whether SRS has been specified, fall back to EPSG:4326 2)
* Determine whether all requested layers use the same SRS, - if so, try to do bounding box
* calculations in native coordinates 3) Aggregate the bounding boxes (in EPSG:4326 or native) 4a)
* If bounding box has been specified, adjust height of image to match 4b) If bounding box has not
* been specified, but height has, adjust bounding box
*/
public static void autoSetBoundsAndSize(GetMapRequest getMap) {
// Get the layers
List<MapLayerInfo> layers = getMap.getLayers();
/** 1) Check what SRS has been requested */
String reqSRS = getMap.getSRS();
// if none, try to determine which SRS to use
// and keep track of whether we can use native all the way
boolean useNativeBounds = true;
if (reqSRS == null) {
reqSRS = guessCommonSRS(layers);
forceSRS(getMap, reqSRS);
}
/** 2) Compare requested SRS */
for (int i = 0; useNativeBounds && i < layers.size(); i++) {
if (layers.get(i) != null) {
String layerSRS = layers.get(i).getSRS();
useNativeBounds =
reqSRS.equalsIgnoreCase(layerSRS)
&& layers.get(i).getResource().getNativeBoundingBox() != null;
} else {
useNativeBounds = false;
}
}
CoordinateReferenceSystem reqCRS;
try {
reqCRS = CRS.decode(reqSRS);
} catch (Exception e) {
throw new ServiceException(e);
}
// Ready to determine the bounds based on the layers, if not specified
Envelope aggregateBbox = getMap.getBbox();
boolean specifiedBbox = true;
// If bbox is not specified by request
if (aggregateBbox == null) {
specifiedBbox = false;
// Get the bounding box from the layers
for (int i = 0; i < layers.size(); i++) {
MapLayerInfo layerInfo = layers.get(i);
ReferencedEnvelope curbbox;
try {
curbbox = layerInfo.getLatLongBoundingBox();
if (useNativeBounds) {
ReferencedEnvelope nativeBbox = layerInfo.getBoundingBox();
if (nativeBbox == null) {
try {
CoordinateReferenceSystem nativeCrs = layerInfo.getCoordinateReferenceSystem();
nativeBbox = curbbox.transform(nativeCrs, true);
} catch (Exception e) {
throw new ServiceException("Best effort native bbox computation failed", e);
}
}
curbbox = nativeBbox;
}
} catch (Exception e) {
throw new RuntimeException(e);
}
if (aggregateBbox != null) {
aggregateBbox.expandToInclude(curbbox);
} else {
aggregateBbox = curbbox;
}
}
ReferencedEnvelope ref = null;
// Reproject back to requested SRS if we have to
if (!useNativeBounds && !reqSRS.equalsIgnoreCase(SRS)) {
try {
ref = new ReferencedEnvelope(aggregateBbox, CRS.decode("EPSG:4326"));
aggregateBbox = ref.transform(reqCRS, true);
} catch (ProjectionException pe) {
ref.expandBy(-1 * ref.getWidth() / 50, -1 * ref.getHeight() / 50);
try {
aggregateBbox = ref.transform(reqCRS, true);
} catch (FactoryException e) {
e.printStackTrace();
} catch (TransformException e) {
e.printStackTrace();
}
// And again...
} catch (NoSuchAuthorityCodeException e) {
e.printStackTrace();
} catch (TransformException e) {
e.printStackTrace();
} catch (FactoryException e) {
e.printStackTrace();
}
}
}
// Just in case
if (aggregateBbox == null) {
forceSRS(getMap, DefaultWebMapService.SRS);
aggregateBbox = DefaultWebMapService.BBOX;
}
// Start the processing of adjust either the bounding box
// or the pixel height / width
double bbheight = aggregateBbox.getHeight();
double bbwidth = aggregateBbox.getWidth();
double bbratio = bbwidth / bbheight;
double mheight = getMap.getHeight();
double mwidth = getMap.getWidth();
if (mheight > 0.5 && mwidth > 0.5 && specifiedBbox) {
// This person really doesnt want our help,
// we'll warp it any way they like it...
} else {
if (mheight > 0.5 && mwidth > 0.5) {
// Fully specified, need to adjust bbox
double mratio = mwidth / mheight;
// Adjust bounds to be less than ideal to meet spec
if (bbratio > mratio) {
// Too wide, need to increase height of bb
double diff = ((bbwidth / mratio) - bbheight) / 2;
aggregateBbox.expandBy(0, diff);
} else {
// Too tall, need to increase width of bb
double diff = ((bbheight * mratio) - bbwidth) / 2;
aggregateBbox.expandBy(diff, 0);
}
adjustBounds(reqSRS, aggregateBbox);
} else if (mheight > 0.5) {
mwidth = bbratio * mheight;
} else {
if (mwidth > 0.5) {
mheight = (mwidth / bbratio >= 1) ? mwidth / bbratio : 1;
} else {
if (bbratio > 1) {
mwidth = MAX_SIDE;
mheight = (mwidth / bbratio >= 1) ? mwidth / bbratio : 1;
} else {
mheight = MAX_SIDE;
mwidth = (mheight * bbratio >= 1) ? mheight * bbratio : 1;
}
// make sure OL output height is sufficient to show the OL scale bar fully
if (mheight < MIN_OL_HEIGHT
&& ("application/openlayers".equalsIgnoreCase(getMap.getFormat())
|| "openlayers".equalsIgnoreCase(getMap.getFormat()))) {
mheight = MIN_OL_HEIGHT;
mwidth = (mheight * bbratio >= 1) ? mheight * bbratio : 1;
}
}
}
// Actually set the bounding box and size of image
getMap.setBbox(aggregateBbox);
getMap.setWidth((int) mwidth);
getMap.setHeight((int) mheight);
}
}
/**
* Returns the read parameters for the specified layer, merging some well known request parameters
* into the read parameters if possible
*
* @param request
* @param mapLayerInfo
* @param layerFilter
* @param reader
* @return
*/
public GeneralParameterValue[] getWMSReadParameters(
final GetMapRequest request,
final MapLayerInfo mapLayerInfo,
final Filter layerFilter,
final List<Object> times,
final List<Object> elevations,
final GridCoverage2DReader reader,
boolean readGeom)
throws IOException {
// setup the scene
final ParameterValueGroup readParametersDescriptor = reader.getFormat().getReadParameters();
CoverageInfo coverage = mapLayerInfo.getCoverage();
MetadataMap metadata = coverage.getMetadata();
GeneralParameterValue[] readParameters =
CoverageUtils.getParameters(readParametersDescriptor, coverage.getParameters(), readGeom);
ReaderDimensionsAccessor dimensions = new ReaderDimensionsAccessor(reader);
// pass down time
final DimensionInfo timeInfo = metadata.get(ResourceInfo.TIME, DimensionInfo.class);
// add the descriptors for custom dimensions
final List<GeneralParameterDescriptor> parameterDescriptors =
new ArrayList<GeneralParameterDescriptor>(
readParametersDescriptor.getDescriptor().descriptors());
Set<ParameterDescriptor<List>> dynamicParameters = reader.getDynamicParameters();
parameterDescriptors.addAll(dynamicParameters);
if (timeInfo != null && timeInfo.isEnabled()) {
// handle "default"
List<Object> fixedTimes = new ArrayList<Object>(times);
for (int i = 0; i < fixedTimes.size(); i++) {
if (fixedTimes.get(i) == null) {
fixedTimes.set(i, getDefaultTime(coverage));
}
}
// pass down the parameters
readParameters =
CoverageUtils.mergeParameter(
parameterDescriptors, readParameters, fixedTimes, "TIME", "Time");
}
// pass down elevation
final DimensionInfo elevationInfo = metadata.get(ResourceInfo.ELEVATION, DimensionInfo.class);
if (elevationInfo != null && elevationInfo.isEnabled()) {
// handle "default"
List<Object> fixedElevations = new ArrayList<Object>(elevations);
for (int i = 0; i < fixedElevations.size(); i++) {
if (fixedElevations.get(i) == null) {
fixedElevations.set(i, getDefaultElevation(coverage));
}
}
readParameters =
CoverageUtils.mergeParameter(
parameterDescriptors, readParameters, fixedElevations, "ELEVATION", "Elevation");
}
if (layerFilter != null && readParameters != null) {
// test for default [empty is replaced with INCLUDE filter] ]filter
for (int i = 0; i < readParameters.length; i++) {
GeneralParameterValue param = readParameters[i];
GeneralParameterDescriptor pd = param.getDescriptor();
if (pd.getName().getCode().equalsIgnoreCase("FILTER")) {
final ParameterValue pv = (ParameterValue) pd.createValue();
// if something different from the default INCLUDE filter is specified
if (layerFilter != Filter.INCLUDE) {
// override the default filter
pv.setValue(layerFilter);
readParameters[i] = pv;
}
break;
}
}
}
// custom dimensions
List<String> customDomains = new ArrayList(dimensions.getCustomDomains());
for (String domain : new ArrayList<String>(customDomains)) {
List<String> values = request.getCustomDimension(domain);
if (values != null) {
readParameters =
CoverageUtils.mergeParameter(parameterDescriptors, readParameters, values, domain);
customDomains.remove(domain);
}
}
// see if we have any custom domain for which we have to set the default value
if (!customDomains.isEmpty()) {
for (String name : customDomains) {
final DimensionInfo customInfo =
metadata.get(ResourceInfo.CUSTOM_DIMENSION_PREFIX + name, DimensionInfo.class);
if (customInfo != null && customInfo.isEnabled()) {
final ArrayList<String> val = new ArrayList<String>(1);
val.add(getDefaultCustomDimensionValue(name, coverage, String.class));
readParameters =
CoverageUtils.mergeParameter(parameterDescriptors, readParameters, val, name);
}
}
}
return readParameters;
}
