/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.geotools.filter.spatial;
import org.geotools.filter.visitor.DuplicatingFilterVisitor;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.referencing.CRS;
import org.opengis.filter.FilterFactory2;
import org.opengis.filter.expression.Literal;
import org.opengis.filter.spatial.BBOX;
import org.opengis.geometry.BoundingBox;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
/**
* Returns a clone of the provided filter where all geometries and bboxes that
* do not have a CRS gets the specified default one.
*
* @author Andrea Aime - The Open Planning Project
*
*/
public class DefaultCRSFilterVisitor extends DuplicatingFilterVisitor {
private CoordinateReferenceSystem defaultCrs;
public DefaultCRSFilterVisitor(FilterFactory2 factory, CoordinateReferenceSystem defaultCrs) {
super(factory);
this.defaultCrs = defaultCrs;
}
public Object visit(BBOX filter, Object extraData) {
// if no srs is specified we can't transform anyways
String srs = filter.getSRS();
if (srs != null && !"".equals(srs.trim()))
return super.visit(filter, extraData);
try {
// grab the original envelope data
double minx = filter.getMinX();
double miny = filter.getMinY();
double maxx = filter.getMaxX();
double maxy = filter.getMaxY();
String propertyName = filter.getPropertyName();
String defaultSrs = CRS.toSRS(defaultCrs);
return getFactory(extraData).bbox(propertyName, minx, miny, maxx, maxy, defaultSrs);
} catch (Exception e) {
throw new RuntimeException("Could not decode srs '" + srs + "'", e);
}
}
public Object visit(Literal expression, Object extraData) {
if (!(expression.getValue() instanceof Geometry))
return super.visit(expression, extraData);
// check if reprojection is needed
Geometry geom = (Geometry) expression.getValue();
if(geom.getUserData() != null && geom.getUserData() instanceof CoordinateReferenceSystem)
return super.visit(expression, extraData);
// clone the geometry and assign the new crs
Geometry clone = geom.getFactory().createGeometry(geom);
clone.setUserData(defaultCrs);
// clone
return ff.literal(clone);
}
}