/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2003-2008, 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.crs;
import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureTypes;
import org.geotools.feature.SchemaException;
import org.geotools.feature.collection.AbstractFeatureCollection;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.referencing.CRS;
import org.opengis.feature.Feature;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.OperationNotFoundException;
import org.opengis.referencing.operation.TransformException;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
/**
* ReprojectFeatureReader provides a reprojection for FeatureTypes.
*
* <p>
* ReprojectFeatureResults is a wrapper used to reproject GeometryAttributes
* to a user supplied CoordinateReferenceSystem from the original
* CoordinateReferenceSystem supplied by the original FeatureResults.
* </p>
*
* <p>
* Example Use:
* <pre><code>
* ReprojectFeatureResults results =
* new ReprojectFeatureResults( originalResults, reprojectCS );
*
* CoordinateReferenceSystem originalCS =
* originalResults.getFeatureType().getDefaultGeometry().getCoordinateSystem();
*
* CoordinateReferenceSystem newCS =
* results.getFeatureType().getDefaultGeometry().getCoordinateSystem();
*
* assertEquals( reprojectCS, newCS );
* </code></pre>
* </p>
*
* @author aaime
* @author $Author: jive $ (last modification)
*
* @source $URL$
* @version $Id$ TODO: handle the case where there is more than one geometry and the other geometries have a different CS than the default geometry
*/
public class ReprojectFeatureResults extends AbstractFeatureCollection {
FeatureCollection<SimpleFeatureType, SimpleFeature> results;
MathTransform transform;
/**
* Creates a new reprojecting feature results
*
* @param results
* @param destinationCS
*
* @throws IOException
* @throws SchemaException
* @throws TransformException
* @throws FactoryException
* @throws NoSuchElementException
* @throws OperationNotFoundException
* @throws CannotCreateTransformException
* @throws NullPointerException DOCUMENT ME!
* @throws IllegalArgumentException
*/
public ReprojectFeatureResults(FeatureCollection<SimpleFeatureType, SimpleFeature> results,
CoordinateReferenceSystem destinationCS)
throws IOException, SchemaException, TransformException, OperationNotFoundException, NoSuchElementException, FactoryException {
super( forceType( origionalType( results ), destinationCS ) );
this.results = origionalCollection( results );
CoordinateReferenceSystem originalCs = null;
if(results instanceof ForceCoordinateSystemFeatureResults)
originalCs = results.getSchema().getGeometryDescriptor().getCoordinateReferenceSystem();
else
originalCs = this.results.getSchema().getGeometryDescriptor().getCoordinateReferenceSystem();
this.transform = CRS.findMathTransform(originalCs,destinationCS, true);
}
public Iterator openIterator() {
return new ReprojectFeatureIterator( results.features(), getSchema(), transform );
}
public void closeIterator( Iterator close ) {
if( close == null ) return;
if( close instanceof ReprojectFeatureIterator){
ReprojectFeatureIterator iterator = (ReprojectFeatureIterator) close;
iterator.close();
}
}
public int size() {
return results.size();
}
private static FeatureCollection<SimpleFeatureType, SimpleFeature> origionalCollection( FeatureCollection<SimpleFeatureType, SimpleFeature> results ){
while( true ){
if ( results instanceof ReprojectFeatureResults ) {
results = ((ReprojectFeatureResults) results).getOrigin();
}
if ( results instanceof ForceCoordinateSystemFeatureResults ) {
results = ((ForceCoordinateSystemFeatureResults) results).getOrigin();
}
break;
}
return results;
}
private static SimpleFeatureType origionalType( FeatureCollection<SimpleFeatureType,SimpleFeature> results ){
while( true ){
if ( results instanceof ReprojectFeatureResults ) {
results = ((ReprojectFeatureResults) results).getOrigin();
}
if ( results instanceof ForceCoordinateSystemFeatureResults ) {
results = ((ForceCoordinateSystemFeatureResults) results).getOrigin();
}
break;
}
return results.getSchema();
}
private static SimpleFeatureType forceType( SimpleFeatureType startingType, CoordinateReferenceSystem forcedCS ) throws SchemaException{
if (forcedCS == null) {
throw new NullPointerException("CoordinateSystem required");
}
CoordinateReferenceSystem originalCs = startingType.getGeometryDescriptor().getCoordinateReferenceSystem();
if (forcedCS.equals(originalCs)) {
return startingType;
}
else {
return FeatureTypes.transform(startingType, forcedCS);
}
}
/**
* This method computes reprojected bounds the hard way, but computing them
* feature by feature. This method could be faster if computed the
* reprojected bounds by reprojecting the original feature bounds a Shape
* object, thus getting the true shape of the reprojected envelope, and
* then computing the minumum and maximum coordinates of that new shape.
* The result would not a true representation of the new bounds, but it
* would be guaranteed to be larger that the true representation.
*
* @see org.geotools.data.FeatureResults#getBounds()
*/
public ReferencedEnvelope getBounds() {
SimpleFeatureIterator r = features();
try {
Envelope newBBox = new Envelope();
Envelope internal;
SimpleFeature feature;
while ( r.hasNext()) {
feature = r.next();
final Geometry geometry = ((Geometry)feature.getDefaultGeometry());
if(geometry != null) {
internal = geometry.getEnvelopeInternal();
newBBox.expandToInclude(internal);
}
}
return ReferencedEnvelope.reference(newBBox);
} catch (Exception e) {
throw new RuntimeException("Exception occurred while computing reprojected bounds",
e);
}
finally {
r.close();
}
}
/**
* Returns the feature results wrapped by this reprojecting feature results
*
*/
public FeatureCollection<SimpleFeatureType, SimpleFeature> getOrigin() {
return results;
}
}