001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/graphics/Layer.java $
002    /*----------------------------------------------------------------------------
003     This file is part of deegree, http://deegree.org/
004     Copyright (C) 2001-2009 by:
005       Department of Geography, University of Bonn
006     and
007       lat/lon GmbH
008    
009     This library is free software; you can redistribute it and/or modify it under
010     the terms of the GNU Lesser General Public License as published by the Free
011     Software Foundation; either version 2.1 of the License, or (at your option)
012     any later version.
013     This library is distributed in the hope that it will be useful, but WITHOUT
014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016     details.
017     You should have received a copy of the GNU Lesser General Public License
018     along with this library; if not, write to the Free Software Foundation, Inc.,
019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020    
021     Contact information:
022    
023     lat/lon GmbH
024     Aennchenstr. 19, 53177 Bonn
025     Germany
026     http://lat-lon.de/
027    
028     Department of Geography, University of Bonn
029     Prof. Dr. Klaus Greve
030     Postfach 1147, 53001 Bonn
031     Germany
032     http://www.geographie.uni-bonn.de/deegree/
033    
034     e-mail: info@deegree.org
035    ----------------------------------------------------------------------------*/
036    package org.deegree.graphics;
037    
038    import org.deegree.model.crs.CoordinateSystem;
039    import org.deegree.model.spatialschema.Envelope;
040    
041    /**
042     * A Layer is a collection of <tt>Feature</tt>s or rasters building a thematic 'unit' waterways
043     * or country borders for example. <tt>Feature</tt>s or raster can be added or removed from the
044     * layer. A <tt>Feature</tt> or raster can e changed by a modul of the application using the layer
045     * because only references to <tt>Feature</tt>s or rasters are stored within a layer.
046     *
047     * <p>
048     * ------------------------------------------------------------------------
049     * </p>
050     *
051     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
052     * @version $Revision: 18195 $ $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
053     */
054    
055    public interface Layer {
056        /**
057         * returns the name of the layer
058         * @return the name of the layer
059         */
060        String getName();
061    
062        /**
063         * returns the BoundingBox (Envelope) of Layer. This is the BoundingBox of the layers data. The
064         * BoundingBox of the View maybe larger or smaler
065         * @return the BoundingBox (Envelope) of Layer
066         */
067        Envelope getBoundingBox();
068    
069        /**
070         * returns the coordinate reference system of the MapView
071         * @return the coordinate reference system of the MapView
072         *
073         */
074        CoordinateSystem getCoordinatesSystem();
075    
076        /**
077         * sets the coordinate reference system of the MapView. If a new crs is set all geometries of
078         * GeometryFeatures will be transformed to the new coordinate reference system.
079         * @param crs to set
080         * @throws Exception if something went wrong
081         *
082         */
083        void setCoordinatesSystem( CoordinateSystem crs )
084                                throws Exception;
085    
086        /**
087         * adds an eventcontroller to the MapView that's responsible for handling events that targets the
088         * map. E.g.: zooming, panning, selecting a feature etc.
089         * @param obj an event controller
090         */
091        void addEventController( LayerEventController obj );
092    
093        /**
094         * @param obj the eventcontroller to remove
095         * @see Layer#addEventController(LayerEventController)
096         */
097        void removeEventController( LayerEventController obj );
098    }