root/tools/routingservice/branches/wrs-2.0/src/handler/ResourceHandler.java

/*  WRS 2.0
 *  Copyright (C) 2009 Anton Patrushev
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package handler;

import java.util.ArrayList;
import java.util.HashMap;

import org.geotools.geometry.jts.JTS;
import org.geotools.referencing.CRS;

import org.opengis.geometry.MismatchedDimensionException;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.NoSuchAuthorityCodeException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;

import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;

import exception.InvalidServiceException;
import geometry.Point;

import model.Resource;
import model.Service;
import util.IOHelper;
import util.Log;
import util.Parameter;
import util.ServiceRequest;

public abstract class ResourceHandler
{
        protected enum DataTypes
        {
                STRING, INTEGER, DOUBLE, GEOMETRY, BOOLEAN;
        }       
        
        protected enum AggregateTypes
        {
                MAX, MIN, AVG, SUM, COUNT;
        }       
        
        public abstract void setResource(Resource resource);

        public abstract boolean checkService(Service service);

        public ArrayList<HashMap<String, Parameter>> handle(ServiceRequest request,
                        Log log) throws InvalidServiceException
        {
                if (checkService(request.getService()))
                {
                        return handleRequest(request, log);
                }
                else
                {
                        throw new InvalidServiceException(request.getService().getName());
                }
        }

        protected abstract ArrayList<HashMap<String, Parameter>> handleRequest(
                        ServiceRequest request, Log log);

        public abstract String fillQueryTemplate(String template, Service service,
                        HashMap<String, Parameter> parameters);
        
        public abstract ArrayList<Point> parseGeometry(String geometry);
        
        public String[] transformPoint(String x, String y, String srid_in, String srid_out) throws NoSuchAuthorityCodeException, FactoryException, ParseException, MismatchedDimensionException, TransformException
        {
                CoordinateReferenceSystem sourceCRS = CRS.decode(srid_in);
                CoordinateReferenceSystem targetCRS = CRS.decode(srid_out);
                MathTransform transform = CRS.findMathTransform(sourceCRS, targetCRS, true);
                
                Geometry point = new WKTReader().read("POINT ("+x+" "+y+")");
                Geometry targetPoint = JTS.transform(point, transform);
                
                String[] result = {IOHelper.FORMATTER.format(targetPoint.getCoordinate().x), IOHelper.FORMATTER.format(targetPoint.getCoordinate().y)};

                return result;
        }

}