/*---------------- FILE HEADER ------------------------------------------
This file is part of deegree.
Copyright (C) 2001-2006 by:
EXSE, Department of Geography, University of Bonn
http://www.giub.uni-bonn.de/deegree/
lat/lon GmbH
http://www.lat-lon.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Andreas Poth
lat/lon GmbH
Aennchenstr. 19
53115 Bonn
Germany
E-Mail: poth@lat-lon.de
Prof. Dr. Klaus Greve
Department of Geography
University of Bonn
Meckenheimer Allee 166
53115 Bonn
Germany
E-Mail: greve@giub.uni-bonn.de
---------------------------------------------------------------------------*/
package org.deegree.graphics;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.deegree.model.crs.CRSFactory;
import org.deegree.model.crs.CoordinateSystem;
import org.deegree.model.spatialschema.Envelope;
import org.deegree.model.spatialschema.GeometryFactory;
/**
* A Layer is a collection of <tt>Feature</tt>s or rasters building a thematic
* 'unit' waterways or country borders for example. <tt>Feature</tt>s or raster
* can be added or removed from the layer. A <tt>Feature</tt> or raster can e
* changed by a modul of the application using the layer because only references
* to <tt>Feature</tt>s or rasters are stored within a layer.
*
* <p>------------------------------------------------------------------------</p>
*
* @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
* @version $Revision: 1.8 $ $Date: 2006/07/12 14:46:18 $
*/
abstract class AbstractLayer implements Layer {
protected CoordinateSystem cs = null;
protected Envelope boundingbox = null;
protected List eventController = Collections.synchronizedList( new ArrayList() );
private String name = null;
/**
* creates a layer with EPSG:4326 as default coordinate system
*/
AbstractLayer( String name ) throws Exception {
this.name = name;
cs = CRSFactory.create( "EPSG:4326" );
}
/**
* Creates a new AbstractLayer object.
*
* @param name
* @param crs
*
* @throws Exception
*/
AbstractLayer( String name, CoordinateSystem crs ) throws Exception {
this.name = name;
cs = crs;
boundingbox = GeometryFactory.createEnvelope( 9E99, 9E99, -9E99, -9E99, null );
}
/**
* returns the name of the layer
*
*/
public String getName() {
return name;
}
/**
* returns the BoundingBox (Envelope) of Layer. This is the BoundingBox of
* the layers data. The BoundingBox of the View maybe larger or smaler
*/
public Envelope getBoundingBox() {
return boundingbox;
}
/**
* returns the coordinate reference system of the MapView
*/
public CoordinateSystem getCoordinatesSystem() {
return cs;
}
/**
* adds an eventcontroller to the MapView that's reponsible for handling
* events that targets the map. E.g.: zooming, panning, selecting a feature etc.
*/
public void addEventController( LayerEventController obj ) {
eventController.add( obj );
obj.addLayer( this );
}
/**
* @see org.deegree.graphics.AbstractLayer#addEventController(LayerEventController)
*/
public void removeEventController( LayerEventController obj ) {
eventController.remove( obj );
obj.removeLayer( this );
}
}/* ********************************************************************
Changes to this class. What the people have been up to:
$Log: AbstractLayer.java,v $
Revision 1.8 2006/07/12 14:46:18 poth
comment footer added
********************************************************************** */