/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2005-2008, 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.feature.visitor;
import org.geotools.feature.FeatureCollection;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
/**
* Calculates the extents (envelope) of the features it visits.
*
* @author Cory Horner, Refractions
*
* @since 2.2.M2
* @source $URL$
*/
public class BoundsVisitor implements FeatureCalc {
ReferencedEnvelope bounds = new ReferencedEnvelope();
public void visit(SimpleFeature feature) {
visit((org.opengis.feature.Feature)feature);
}
public void visit(org.opengis.feature.Feature feature) {
bounds.include( feature.getBounds() );
}
public ReferencedEnvelope getBounds() {
return bounds;
}
public void reset(Envelope bounds) {
this.bounds = new ReferencedEnvelope();
}
public CalcResult getResult() {
return new BoundsResult(bounds);
}
public static class BoundsResult extends AbstractCalcResult {
private ReferencedEnvelope bbox;
public BoundsResult(ReferencedEnvelope bbox) {
this.bbox = bbox;
}
public ReferencedEnvelope getValue() {
return new ReferencedEnvelope(bbox);
}
public boolean isCompatible(CalcResult targetResults) {
//list each calculation result which can merge with this type of result
if (targetResults instanceof BoundsResult) {
return true;
}
return false;
}
public CalcResult merge(CalcResult resultsToAdd) {
if (!isCompatible(resultsToAdd)) {
throw new IllegalArgumentException(
"Parameter is not a compatible type");
}
if (resultsToAdd instanceof BoundsResult) {
BoundsResult boundsToAdd = (BoundsResult) resultsToAdd;
//add one set to the other (to create one big unique list)
ReferencedEnvelope newBounds = new ReferencedEnvelope(bbox);
newBounds.include( boundsToAdd.getValue());
return new BoundsResult(newBounds);
} else {
throw new IllegalArgumentException(
"The CalcResults claim to be compatible, but the appropriate merge method has not been implemented.");
}
}
}
}