/*  Package GeoTools/WFS Implementation
 *  Copyright (C) 2001 Cameron Shorter (camerons@users.sourceforge.net)
 *                     Artur Hefczyc (kobit@users.sourceforge.net)
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * $Id: WFSLayer.java,v 1.2 2002/02/17 04:10:21 camerons Exp $
 * $Author: camerons $
 * $Date: 2002/02/17 04:10:21 $
 */

package uk.ac.leeds.ccg.ogc;

import uk.ac.leeds.ccg.geotools.*;
import uk.ac.leeds.ccg.gml.*;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.io.InputStream;

/**
 * WFSLayer provides an interface to view map layers from Web Feature Services
 * (as defined by the Open GIS Consortium).
 *
 * @author <a href="mailto:camerons@users.sourceforge.net">Cameron Shorter</a>
 * @author <a href="mailto:kobit@users.sourceforge.net">Artur Hefczyc</a>
 * @version $Revision: 1.2 $
 */
public class WFSLayer extends WebServiceLayer
{
    /** Provides base URL and utils for WFS */
    private WFSDataSource wfsDataSource;
    /** Extent of the layer */
    private GeoRectangle bbox;

    private final static boolean DEBUG=true;

    /**
     * Construct a WFS Layer.
     * @param wfsDataSource all info except extent required to draw a WFS layer.
     */
    public WFSLayer(
            WFSDataSource wfsDataSource)
    {
        if(DEBUG)System.out.println("WFSLayer created");
        this.wfsDataSource=wfsDataSource;
    }


    /** Build a new layer based on the extent passed in.  It gets called by
     * WebServices.PaintScaled().
     * @param gg Graphical information required to build the layer.  (In
     * particular, extent).
     */
    public Layer buildLayer(GeoGraphics gg)
    {
        URL url;
        GeoRectangle extent = gg.getScale().getMapExtent();
        Layer layer;

        wfsDataSource.setExtent(extent);
        url=wfsDataSource.getURL();
        if (url!=null) {
            GML2Reader gml=new GML2Reader(url,wfsDataSource.getProxy());
            layer=gml.getLayer();
        }
        else {
            layer=null;
        }
        return layer;
    }

    public void paintScaled(GeoGraphics gg)
    {
        GeoRectangle extent;

        extent = gg.getScale().getMapExtent();
        if (extent==null||extent.isEmpty()&&this.bbox!=null){
            gg.getScale().setMapExtent(this.bbox,true);
            if(DEBUG)System.out.println("WFSLayer: setExent="+extent);
        }
        super.paintScaled(gg);
    }
}