001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/tags/2.1/src/org/deegree/graphics/AbstractLayer.java $
002 /*---------------- FILE HEADER ------------------------------------------
003
004 This file is part of deegree.
005 Copyright (C) 2001-2007 by:
006 EXSE, Department of Geography, University of Bonn
007 http://www.giub.uni-bonn.de/deegree/
008 lat/lon GmbH
009 http://www.lat-lon.de
010
011 This library is free software; you can redistribute it and/or
012 modify it under the terms of the GNU Lesser General Public
013 License as published by the Free Software Foundation; either
014 version 2.1 of the License, or (at your option) any later version.
015
016 This library is distributed in the hope that it will be useful,
017 but WITHOUT ANY WARRANTY; without even the implied warranty of
018 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
019 Lesser General Public License for more details.
020
021 You should have received a copy of the GNU Lesser General Public
022 License along with this library; if not, write to the Free Software
023 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
024
025 Contact:
026
027 Andreas Poth
028 lat/lon GmbH
029 Aennchenstr. 19
030 53115 Bonn
031 Germany
032 E-Mail: poth@lat-lon.de
033
034 Prof. Dr. Klaus Greve
035 Department of Geography
036 University of Bonn
037 Meckenheimer Allee 166
038 53115 Bonn
039 Germany
040 E-Mail: greve@giub.uni-bonn.de
041
042
043 ---------------------------------------------------------------------------*/
044 package org.deegree.graphics;
045
046 import java.util.ArrayList;
047 import java.util.Collections;
048 import java.util.List;
049
050 import org.deegree.model.crs.CRSFactory;
051 import org.deegree.model.crs.CoordinateSystem;
052 import org.deegree.model.spatialschema.Envelope;
053 import org.deegree.model.spatialschema.GeometryFactory;
054
055 /**
056 * A Layer is a collection of <tt>Feature</tt>s or rasters building a thematic 'unit' waterways
057 * or country borders for example. <tt>Feature</tt>s or raster can be added or removed from the
058 * layer. A <tt>Feature</tt> or raster can e changed by a modul of the application using the layer
059 * because only references to <tt>Feature</tt>s or rasters are stored within a layer.
060 *
061 *
062 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
063 * @version $Revision: 7822 $ $Date: 2007-07-24 09:58:48 +0200 (Di, 24 Jul 2007) $
064 */
065
066 abstract class AbstractLayer implements Layer {
067
068 protected CoordinateSystem cs = null;
069
070 protected Envelope boundingbox = null;
071
072 protected List<EventController> eventController = Collections.synchronizedList( new ArrayList<EventController>() );
073
074 private String name = null;
075
076 /**
077 * creates a layer with EPSG:4326 as default coordinate system
078 * @param name
079 * @throws Exception
080 */
081 AbstractLayer( String name ) throws Exception {
082 this.name = name;
083 cs = CRSFactory.create( "EPSG:4326" );
084
085 }
086
087 /**
088 * Creates a new AbstractLayer object.
089 *
090 * @param name
091 * @param crs
092 *
093 * @throws Exception
094 */
095 AbstractLayer( String name, CoordinateSystem crs ) throws Exception {
096 this.name = name;
097
098 cs = crs;
099
100 boundingbox = GeometryFactory.createEnvelope( 9E99, 9E99, -9E99, -9E99, null );
101 }
102
103 /**
104 * returns the name of the layer
105 * @return the name of the layer
106 */
107 public String getName() {
108 return name;
109 }
110
111 /**
112 * returns the BoundingBox (Envelope) of Layer. This is the BoundingBox of the layers data. The
113 * BoundingBox of the View maybe larger or smaller
114 * @return the BoundingBox (Envelope) of Layer
115 */
116 public Envelope getBoundingBox() {
117 return boundingbox;
118 }
119
120 /**
121 * returns the coordinate reference system of the MapView
122 * @return the coordinate reference system of the MapView
123 */
124 public CoordinateSystem getCoordinatesSystem() {
125 return cs;
126 }
127
128 /**
129 * adds an eventcontroller to the MapView that's reponsible for handling events that targets the
130 * map. E.g.: zooming, panning, selecting a feature etc.
131 * @param obj
132 */
133 public void addEventController( LayerEventController obj ) {
134 eventController.add( obj );
135 obj.addLayer( this );
136 }
137
138 /**
139 * @see org.deegree.graphics.AbstractLayer#addEventController(LayerEventController)
140 * @param obj
141 */
142 public void removeEventController( LayerEventController obj ) {
143 eventController.remove( obj );
144 obj.removeLayer( this );
145 }
146 }