/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2001-2007, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
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.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.crs.SingleCRS;
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
*
*
* @source $URL$
*/
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);
if (defaultCrs == null
|| filter.getBounds() == null
|| defaultCrs.getCoordinateSystem().getDimension() == filter.getBounds()
.getDimension()) {
return getFactory(extraData).bbox(filter.getExpression1(),
ReferencedEnvelope.create(filter.getBounds(), defaultCrs));
} else {
try {
SingleCRS horizontalCRS = CRS.getHorizontalCRS(defaultCrs);
ReferencedEnvelope bounds = ReferencedEnvelope.create(filter.getBounds(),
horizontalCRS);
return getFactory(extraData).bbox(filter.getExpression1(), bounds);
} 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);
}
}