/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
* (c) 2001 - 2013 OpenPlans
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.geoserver.wfs;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.factory.GeoTools;
import org.geotools.filter.spatial.DefaultCRSFilterVisitor;
import org.geotools.filter.spatial.ReprojectingFilterVisitor;
import org.geotools.gml2.bindings.GML2EncodingUtils;
import org.geotools.referencing.CRS;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.FeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.FilterFactory2;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
/**
* Utility class used to handle common WFS reprojection issues
*
* @author Andrea Aime, TOPP
*
*/
class WFSReprojectionUtil {
static FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(GeoTools.getDefaultHints());
/**
* Returns the declared CRS given the native CRS and the request WFS version
*
* @param nativeCRS
* @param wfsVersion
* @return
*/
public static CoordinateReferenceSystem getDeclaredCrs(CoordinateReferenceSystem nativeCRS,
String wfsVersion) {
try {
if(nativeCRS == null)
return null;
if (wfsVersion.equals("1.0.0")) {
return nativeCRS;
} else {
String code = GML2EncodingUtils.epsgCode(nativeCRS);
//it's possible that we can't do the CRS -> code -> CRS conversion...so we'll just return what we have
if (code == null) return nativeCRS;
return CRS.decode("urn:x-ogc:def:crs:EPSG:6.11.2:" + code);
}
} catch (Exception e) {
throw new WFSException("We have had issues trying to flip axis of " + nativeCRS, e);
}
}
/**
* Returns the declared CRS given a feature type and the request WFS version
*
* @param nativeCRS
* @param wfsVersion
* @return
*/
public static CoordinateReferenceSystem getDeclaredCrs(FeatureType schema, String wfsVersion) {
if (schema == null)
return null;
CoordinateReferenceSystem crs = (schema.getGeometryDescriptor() != null) ? schema
.getGeometryDescriptor().getCoordinateReferenceSystem() : null;
return getDeclaredCrs(crs, wfsVersion);
}
/**
* Applies a default CRS to all geometric filter elements that do not
* already have one
*
* @param nativeCRS
* @param wfsVersion
* @return
*/
public static Filter applyDefaultCRS(Filter filter, CoordinateReferenceSystem defaultCRS) {
DefaultCRSFilterVisitor defaultVisitor = new DefaultCRSFilterVisitor(ff, defaultCRS);
return (Filter) filter.accept(defaultVisitor, null);
}
/**
* Reprojects all geometric filter elements to the native CRS of the
* provided schema
*
* @param filter
* @param schema
* @return
*/
public static Filter reprojectFilter(Filter filter, FeatureType schema) {
ReprojectingFilterVisitor visitor = new ReprojectingFilterVisitor(ff, schema);
return (Filter) filter.accept(visitor, null);
}
/**
* Convenience method, same as calling {@link #applyDefaultCRS} and then
* {@link #reprojectFilter(Filter, SimpleFeatureType)} in a row
*
* @param filter
* @param schema
* @param defaultCRS
* @return
*/
public static Filter normalizeFilterCRS(Filter filter, FeatureType schema,
CoordinateReferenceSystem defaultCRS) {
Filter defaulted = applyDefaultCRS(filter, defaultCRS);
return reprojectFilter(defaulted, schema);
}
}