/*
* This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
*
* Copyright 2008-2011 Geosparc nv, http://www.geosparc.com/, Belgium.
*
* The program is available in open source according to the GNU Affero
* General Public License. All contributions in this program are covered
* by the Geomajas Contributors License Agreement. For full licensing
* details, see LICENSE.txt in the project root.
*/
package org.geomajas.internal.layer.vector;
import org.geomajas.geometry.CrsTransform;
import org.geomajas.global.GeomajasException;
import org.geomajas.layer.VectorLayer;
import org.geomajas.layer.pipeline.GetTileContainer;
import org.geomajas.layer.tile.TileMetadata;
import org.geomajas.service.FilterService;
import org.geomajas.service.GeoService;
import org.geomajas.service.pipeline.PipelineCode;
import org.geomajas.service.pipeline.PipelineContext;
import org.geomajas.service.pipeline.PipelineStep;
import org.opengis.filter.Filter;
import org.springframework.beans.factory.annotation.Autowired;
import com.vividsolutions.jts.geom.Envelope;
/**
* Determine the filter which needs to be applied to get the features.
*
* @author Joachim Van der Auwera
*/
public class GetTileFilterStep implements PipelineStep<GetTileContainer> {
private String id;
@Autowired
private FilterService filterService;
@Autowired
private GeoService geoService;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public void execute(PipelineContext context, GetTileContainer response) throws GeomajasException {
VectorLayer layer = context.get(PipelineCode.LAYER_KEY, VectorLayer.class);
TileMetadata metadata = context.get(PipelineCode.TILE_METADATA_KEY, TileMetadata.class);
CrsTransform layerToMap = context.get(PipelineCode.CRS_TRANSFORM_KEY, CrsTransform.class);
CrsTransform maptoLayer = geoService.getCrsTransform(layerToMap.getTarget(), layerToMap.getSource());
String geomName = layer.getLayerInfo().getFeatureInfo().getGeometryType().getName();
String epsg = Integer.toString(geoService.getSridFromCrs(layer.getCrs()));
// transform tile bounds back to layer coordinates
// TODO: for non-affine transforms this is not accurate enough !
Envelope bounds = geoService.transform(response.getTile().getBounds(), maptoLayer);
Filter filter = filterService.createBboxFilter(epsg, bounds, geomName);
if (null != metadata.getFilter()) {
filter = filterService.createAndFilter(filterService.parseFilter(metadata.getFilter()), filter);
}
context.put(PipelineCode.FILTER_KEY, filter);
}
}