001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/branches/2.2_testing/src/org/deegree/graphics/AbstractLayer.java $
002 /*---------------- FILE HEADER ------------------------------------------
003
004 This file is part of deegree.
005 Copyright (C) 2001-2008 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: 9340 $ $Date: 2007-12-27 13:32:12 +0100 (Do, 27 Dez 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 *
079 * @param name
080 * @throws Exception
081 */
082 AbstractLayer( String name ) throws Exception {
083 this.name = name;
084 cs = CRSFactory.create( "EPSG:4326" );
085
086 }
087
088 /**
089 * Creates a new AbstractLayer object.
090 *
091 * @param name
092 * @param crs
093 *
094 * @throws Exception
095 */
096 AbstractLayer( String name, CoordinateSystem crs ) throws Exception {
097 this.name = name;
098
099 cs = crs;
100
101 boundingbox = GeometryFactory.createEnvelope( 9E99, 9E99, -9E99, -9E99, null );
102 }
103
104 /**
105 * returns the name of the layer
106 *
107 * @return the name of the layer
108 */
109 public String getName() {
110 return name;
111 }
112
113 /**
114 * returns the BoundingBox (Envelope) of Layer. This is the BoundingBox of the layers data. The
115 * BoundingBox of the View maybe larger or smaller
116 *
117 * @return the BoundingBox (Envelope) of Layer
118 */
119 public Envelope getBoundingBox() {
120 return boundingbox;
121 }
122
123 /**
124 * returns the coordinate reference system of the MapView
125 *
126 * @return the coordinate reference system of the MapView
127 */
128 public CoordinateSystem getCoordinatesSystem() {
129 return cs;
130 }
131
132 /**
133 * adds an eventcontroller to the MapView that's reponsible for handling events that targets the
134 * map. E.g.: zooming, panning, selecting a feature etc.
135 *
136 * @param obj
137 */
138 public void addEventController( LayerEventController obj ) {
139 eventController.add( obj );
140 obj.addLayer( this );
141 }
142
143 /**
144 * @see org.deegree.graphics.AbstractLayer#addEventController(LayerEventController)
145 * @param obj
146 */
147 public void removeEventController( LayerEventController obj ) {
148 eventController.remove( obj );
149 obj.removeLayer( this );
150 }
151 }