/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.vfny.geoserver.wms.responses.map.kml;
import java.sql.Connection;
import org.geoserver.catalog.FeatureTypeInfo;
import org.geoserver.config.GeoServer;
import org.geotools.data.DefaultQuery;
import org.geotools.data.FeatureSource;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.feature.FeatureIterator;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.type.GeometryDescriptor;
import org.opengis.filter.FilterFactory;
import org.opengis.filter.spatial.BBOX;
/**
* This strategy just return the features as they come from the db
* and leave the pyramid structure do the rest. Of course is the data is
* inserted in the db in a way that makes it return features in some linear
* way the distribution won't look good. But the same might happen to
* attribute sorting as well, for example, when the high values of the
* sorting attribute do concentrate in a specific area instead of being
* evenly spread out.
* @author Andrea Aime
*/
public class RandomRegionatingStrategy extends
CachedHierarchyRegionatingStrategy {
public RandomRegionatingStrategy(GeoServer gs) {
super(gs);
}
@Override
public FeatureIterator getSortedFeatures(GeometryDescriptor geom,
ReferencedEnvelope latLongEnv, ReferencedEnvelope nativeEnv,
Connection cacheConn) throws Exception {
FeatureSource fs = featureType.getFeatureSource(null, null);
// build the bbox filter
FilterFactory ff = CommonFactoryFinder.getFilterFactory(null);
BBOX filter = ff.bbox(geom.getLocalName(), nativeEnv.getMinX(),
nativeEnv.getMinY(), nativeEnv.getMaxX(), nativeEnv.getMaxY(), null);
// build an optimized query (only the necessary attributes
DefaultQuery q = new DefaultQuery();
q.setFilter(filter);
// TODO: enable this when JTS learns how to compute centroids
// without triggering the
// generation of Coordinate[] out of the sequences...
// q.setHints(new Hints(Hints.JTS_COORDINATE_SEQUENCE_FACTORY,
// PackedCoordinateSequenceFactory.class));
q.setPropertyNames(new String[] { geom.getLocalName() });
// return the reader
return fs.getFeatures(q).features();
}
}