/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, 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.data.spatialite;
import java.io.IOException;
import org.geotools.data.jdbc.FilterToSQL;
import org.geotools.filter.FilterCapabilities;
import org.opengis.filter.expression.Literal;
import org.opengis.filter.expression.PropertyName;
import org.opengis.filter.spatial.BBOX;
import org.opengis.filter.spatial.Beyond;
import org.opengis.filter.spatial.BinarySpatialOperator;
import org.opengis.filter.spatial.Contains;
import org.opengis.filter.spatial.Crosses;
import org.opengis.filter.spatial.DWithin;
import org.opengis.filter.spatial.Disjoint;
import org.opengis.filter.spatial.DistanceBufferOperator;
import org.opengis.filter.spatial.Equals;
import org.opengis.filter.spatial.Intersects;
import org.opengis.filter.spatial.Overlaps;
import org.opengis.filter.spatial.Touches;
import org.opengis.filter.spatial.Within;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.LinearRing;
/**
*
*
* @source $URL$
*/
public class SpatiaLiteFilterToSQL extends FilterToSQL {
@Override
protected FilterCapabilities createFilterCapabilities() {
FilterCapabilities caps = super.createFilterCapabilities();
caps.addType(BBOX.class);
caps.addType(Contains.class);
caps.addType(Crosses.class);
caps.addType(Disjoint.class);
caps.addType(Equals.class);
caps.addType(Intersects.class);
caps.addType(Overlaps.class);
caps.addType(Touches.class);
caps.addType(Within.class);
caps.addType(DWithin.class);
caps.addType(Beyond.class);
return caps;
}
@Override
protected void visitLiteralGeometry(Literal expression) throws IOException {
Geometry g = (Geometry) evaluateLiteral(expression, Geometry.class);
if (g instanceof LinearRing) {
//WKT does not support linear rings
g = g.getFactory().createLineString(((LinearRing) g).getCoordinateSequence());
}
out.write( "GeomFromText('"+g.toText()+"', "+currentSRID+")");
}
@Override
protected Object visitBinarySpatialOperator(BinarySpatialOperator filter,
PropertyName property, Literal geometry, boolean swapped, Object extraData) {
try {
if (filter instanceof DistanceBufferOperator) {
out.write("Distance(");
property.accept(this, extraData);
out.write(", ");
geometry.accept(this, extraData);
out.write(")");
if (filter instanceof DWithin) {
out.write("<");
}
else if (filter instanceof Beyond) {
out.write(">");
}
else {
throw new RuntimeException("Unknown distance operator");
}
out.write(Double.toString(((DistanceBufferOperator)filter).getDistance()));
}
else if (filter instanceof BBOX) {
out.write("MbrIntersects(");
property.accept(this, extraData);
out.write(",");
geometry.accept(this, extraData);
out.write(") = 1");
}
else {
if (filter instanceof Contains) {
out.write("Contains(");
}
else if (filter instanceof Crosses) {
out.write("Crosses(");
}
else if (filter instanceof Disjoint) {
out.write("Disjoint(");
}
else if (filter instanceof Equals) {
out.write("Equals(");
}
else if (filter instanceof Intersects) {
out.write("Intersects(");
}
else if (filter instanceof Overlaps) {
out.write("Overlaps(");
}
else if (filter instanceof Touches) {
out.write("Touches(");
}
else if (filter instanceof Within) {
out.write("Within(");
}
else {
throw new RuntimeException("Unknown operator: " + filter);
}
if (swapped) {
geometry.accept(this, extraData);
out.write(", ");
property.accept(this, extraData);
}
else {
property.accept(this, extraData);
out.write(", ");
geometry.accept(this, extraData);
}
out.write(")");
}
if (!(filter instanceof Disjoint)) {
String spatialIndex = (String)
currentGeometry.getUserData().get(SpatiaLiteDialect.SPATIALITE_SPATIAL_INDEX);
if (spatialIndex != null) {
Envelope e = geometry.evaluate(null, Envelope.class);
out.write(" AND ROWID IN (");
out.write("SELECT pkid FROM \""+spatialIndex+"\" WHERE ");
out.write("xmin <= " + e.getMaxX() + " AND ");
out.write("xmax >= " + e.getMinX() + " AND ");
out.write("ymin <= " + e.getMaxY() + " AND ");
out.write("ymax >= " + e.getMinY());
out.write(")");
}
}
}
catch (IOException e) {
throw new RuntimeException(e);
}
return extraData;
}
}