/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2006-2008, 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.filter.spatial;
import org.geotools.filter.AttributeExpressionImpl;
import org.geotools.filter.IllegalFilterException;
import org.geotools.filter.LiteralExpressionImpl;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.referencing.CRS;
import org.opengis.filter.FilterVisitor;
import org.opengis.filter.expression.Expression;
import org.opengis.filter.expression.Literal;
import org.opengis.filter.expression.PropertyName;
import org.opengis.filter.spatial.BBOX;
import org.opengis.geometry.BoundingBox;
import org.opengis.geometry.MismatchedDimensionException;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.NoSuchAuthorityCodeException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Polygon;
import com.vividsolutions.jts.geom.TopologyException;
import com.vividsolutions.jts.geom.prep.PreparedGeometry;
/**
*
*
* @source $URL$
*/
public class BBOXImpl extends AbstractPreparedGeometryFilter implements BBOX {
double minx, miny, maxx, maxy;
String srs;
public BBOXImpl(Expression e1, Expression e2) {
super(e1, e2);
if (e1 != null)
setExpression1(e1);
if (e2 != null)
setExpression2(e2);
}
public BBOXImpl(Expression name, double minx, double miny, double maxx, double maxy, String srs) {
this(name,
new LiteralExpressionImpl(boundingPolygon(new Envelope(minx, maxx, miny, maxy)))
);
this.srs = srs;
}
public BBOXImpl(Expression e1, Expression e2, MatchAction matchAction) {
super(e1, e2, matchAction);
if (e1 != null)
setExpression1(e1);
if (e2 != null)
setExpression2(e2);
}
public BBOXImpl(Expression name, double minx, double miny, double maxx, double maxy,
String srs, MatchAction matchAction) {
this(name,
new LiteralExpressionImpl( boundingPolygon(buildEnvelope(minx, maxx, miny, maxy, srs))),
matchAction);
this.srs = srs;
}
public String getPropertyName() {
// BBOX filters can be also created setting the expressions directly, and some
// old code sets the property name the other way around, try to handle this silliness
if (getExpression1() instanceof PropertyName) {
PropertyName propertyName = (PropertyName) getExpression1();
return propertyName.getPropertyName();
} else if (getExpression2() instanceof PropertyName) {
PropertyName propertyName = (PropertyName) getExpression2();
return propertyName.getPropertyName();
} else {
return null;
}
}
public void setPropertyName(String propertyName) {
setExpression1(new AttributeExpressionImpl(propertyName));
}
public String getSRS() {
return srs;
}
/**
* @deprecated use the constructor or setExpression2
*/
public void setSRS(String srs) {
this.srs = srs;
updateExpression2();
}
public double getMinX() {
return minx;
}
/**
* @deprecated use the constructor or setExpression2
*/
public void setMinX(double minx) {
this.minx = minx;
updateExpression2();
}
public double getMinY() {
return miny;
}
/**
* @deprecated use the constructor or setExpression2
*/
public void setMinY(double miny) {
this.miny = miny;
updateExpression2();
}
public double getMaxX() {
return maxx;
}
/**
* @deprecated use the constructor or setExpression2
*/
public void setMaxX(double maxx) {
this.maxx = maxx;
updateExpression2();
}
public double getMaxY() {
return maxy;
}
/**
* @deprecated use the constructor or setExpression2
*/
public void setMaxY(double maxy) {
this.maxy = maxy;
updateExpression2();
}
private void updateExpression2() {
// this is temporary until set...XY are removed
Literal expression =
new LiteralExpressionImpl( boundingPolygon(buildEnvelope(minx, maxx, miny, maxy, srs)));
super.setExpression2(expression);
}
@Override
public boolean evaluateInternal(Geometry left, Geometry right) {
switch (literals) {
case BOTH:
return cacheValue;
case RIGHT: {
return preppedEvaluate(rightPreppedGeom, left);
}
case LEFT: {
return preppedEvaluate(leftPreppedGeom, right);
}
default: {
return basicEvaluate(left, right);
}
}
}
protected boolean basicEvaluate(Geometry left, Geometry right) {
Envelope envLeft = left.getEnvelopeInternal();
Envelope envRight = right.getEnvelopeInternal();
if (envRight.intersects(envLeft)) {
return left.intersects(right);
} else {
return false;
}
// Note that this is a pretty permissive logic
// if the type has somehow been mis-set (can't happen externally)
// then true is returned in all cases
}
private boolean preppedEvaluate(PreparedGeometry prepped, Geometry other) {
Envelope envLeft = prepped.getGeometry().getEnvelopeInternal();
Envelope envRight = other.getEnvelopeInternal();
if(envRight.intersects(envLeft)) {
return prepped.intersects(other);
} else {
return false;
}
// Note that this is a pretty permissive logic
// if the type has somehow been mis-set (can't happen externally)
// then true is returned in all cases
}
public Object accept(FilterVisitor visitor, Object extraData) {
return visitor.visit(this, extraData);
}
public void setExpression1(Expression expression) {
// BBOX filters can be also created setting the expressions directly, and some
// old code sets the property name the other way around, try to handle this silliness
updateMinMaxFields(expression);
super.setExpression1(expression);
}
public void setExpression2(Expression expression) {
// BBOX filters can be also created setting the expressions directly, and some
// old code sets the property name the other way around, try to handle this silliness
updateMinMaxFields(expression);
super.setExpression2(expression);
}
private void updateMinMaxFields(Expression expression) {
if (expression instanceof Literal) {
Literal bbox = (Literal) expression;
Object value = bbox.getValue();
if (value instanceof BoundingBox) {
BoundingBox env = (BoundingBox) value;
minx = env.getMinX();
maxx = env.getMaxX();
miny = env.getMinY();
maxy = env.getMaxY();
srs = CRS.toSRS(env.getCoordinateReferenceSystem());
} else {
Envelope env = null;
if (value instanceof Envelope) {
env = (Envelope) value;
} else if (value instanceof Geometry) {
Geometry geom = (Geometry) value;
env = geom.getEnvelopeInternal();
if (geom.getUserData() != null) {
if (geom.getUserData() instanceof String) {
srs = (String) geom.getUserData();
} else if (geom.getUserData() instanceof CoordinateReferenceSystem) {
srs = CRS.toSRS((CoordinateReferenceSystem) geom.getUserData());
}
}
} else {
env = (Envelope) bbox.evaluate(null, Envelope.class);
}
if (env == null)
return;
minx = env.getMinX();
maxx = env.getMaxX();
miny = env.getMinY();
maxy = env.getMaxY();
}
}
}
/**
* Generate bounding polygon for provided envelope.
*
* For a ReferenedEnvelope the CoordinateReferenceSystem wil be preserved.
*
* @param env The envelope to set as the bounds.
*
* @throws IllegalFilterException If the box can not be created.
*
* @task Currently sets the SRID to null, which can cause problems
* with JTS when it comes to doing spatial tests
*/
public static Polygon boundingPolygon( Envelope env ){
/** Factory for creating geometries */
GeometryFactory gfac = JTSFactoryFinder.getGeometryFactory();
Coordinate[] coords = new Coordinate[5];
coords[0] = new Coordinate(env.getMinX(), env.getMinY());
coords[1] = new Coordinate(env.getMinX(), env.getMaxY());
coords[2] = new Coordinate(env.getMaxX(), env.getMaxY());
coords[3] = new Coordinate(env.getMaxX(), env.getMinY());
coords[4] = new Coordinate(env.getMinX(), env.getMinY());
LinearRing ring = null;
try {
ring = gfac.createLinearRing(coords);
} catch (TopologyException tex) {
throw new IllegalFilterException(tex.toString());
}
Polygon polygon = gfac.createPolygon(ring, null);
if (env instanceof ReferencedEnvelope) {
ReferencedEnvelope refEnv = (ReferencedEnvelope) env;
polygon.setUserData(refEnv.getCoordinateReferenceSystem());
}
return polygon;
}
private static ReferencedEnvelope buildEnvelope(double minx, double maxx, double miny, double maxy, String srs) {
CoordinateReferenceSystem crs = null;
if (srs != null && !("".equals(srs)))
try {
try {
crs = CRS.decode(srs);
} catch (MismatchedDimensionException e) {
throw new RuntimeException (e);
} catch (NoSuchAuthorityCodeException e) {
CRS.parseWKT(srs);
}
} catch (FactoryException e) {
}
return new ReferencedEnvelope(minx, maxx, miny, maxy, crs);
}
@Override
public BoundingBox getBounds() {
Object value = ((Literal) getExpression2()).getValue();
if (value instanceof BoundingBox) {
return (BoundingBox) value;
}
else { //create one
return buildEnvelope(minx, maxx, miny, maxy, srs);
}
}
}