001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/portal/standard/wms/control/layertree/LayerTreeListener.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.portal.standard.wms.control.layertree;
037    
038    import java.io.IOException;
039    import java.net.URL;
040    import java.nio.charset.Charset;
041    import java.util.List;
042    
043    import org.deegree.enterprise.control.ajax.AbstractListener;
044    import org.deegree.enterprise.control.ajax.ResponseHandler;
045    import org.deegree.enterprise.control.ajax.WebEvent;
046    import org.deegree.framework.util.MapUtils;
047    import org.deegree.model.spatialschema.Envelope;
048    import org.deegree.model.spatialschema.GeometryFactory;
049    import org.deegree.model.spatialschema.Point;
050    import org.deegree.portal.Constants;
051    import org.deegree.portal.context.LayerGroup;
052    import org.deegree.portal.context.MMLayer;
053    import org.deegree.portal.context.MapModel;
054    import org.deegree.portal.context.MapModelEntry;
055    import org.deegree.portal.context.ViewContext;
056    
057    /**
058     * TODO add class documentation here
059     * 
060     * @author <a href="mailto:name@deegree.org">Andreas Poth</a>
061     * @author last edited by: $Author: jwilden $
062     * 
063     * @version $Revision: 25499 $, $Date: 2010-07-26 15:43:40 +0200 (Mo, 26 Jul 2010) $
064     */
065    public class LayerTreeListener extends AbstractListener {
066    
067        private double scale = 0;
068    
069        public void actionPerformed( WebEvent event, ResponseHandler responseHandler )
070                                throws IOException {
071            ViewContext vc = (ViewContext) event.getSession().getAttribute( Constants.CURRENTMAPCONTEXT );
072            Point[] points = vc.getGeneral().getBoundingBox();
073            Envelope bbox = GeometryFactory.createEnvelope( points[0].getPosition(), points[1].getPosition(),
074                                                            points[0].getCoordinateSystem() );
075            scale = MapUtils.calcScaleWMS111( vc.getGeneral().getWindow().width, vc.getGeneral().getWindow().height, bbox,
076                                              bbox.getCoordinateSystem() );
077    
078            StringBuilder sb = new StringBuilder( 10000 );
079            sb.append( '[' );
080            // return all nodes for root
081            MapModel mapModel = vc.getGeneral().getExtension().getMapModel();
082            List<LayerGroup> layerGroups = mapModel.getLayerGroups();
083            for ( LayerGroup lg : layerGroups ) {
084                sb.append( "{'text' : " );
085                sb.append( "'" ).append( lg.getTitle() ).append( "'," );
086                sb.append( "'id' : '" ).append( lg.getIdentifier() ).append( "'," );
087                sb.append( "'checked': true," );
088                sb.append( "'expanded': " ).append( lg.isExpanded() ).append( "," );
089                sb.append( "'leaf' : false, 'cls' : 'folder' " );
090                appendChildren( sb, lg );
091                sb.append( "}" );
092    
093            }
094            sb.append( ']' );
095            String charEnc = Charset.defaultCharset().displayName();
096            responseHandler.setContentType( "application/json; " + charEnc );
097            responseHandler.writeAndClose( sb.toString() );
098        }
099    
100        /**
101         * @param sb
102         * @param n
103         * @param vc
104         */
105        private void appendChildren( StringBuilder sb, LayerGroup layerGroup ) {
106    
107            List<MapModelEntry> mme = layerGroup.getMapModelEntries();
108    
109            if ( mme.size() > 0 ) {
110    
111                sb.append( ", 'children' : [" );
112                for ( int i = 0; i < mme.size(); i++ ) {
113                    if ( mme.get( i ) instanceof MMLayer ) {
114                        MMLayer layer = (MMLayer) mme.get( i );
115                        URL s = null;
116                        if ( layer.getLayer().getStyleList().getCurrentStyle().getLegendURL() != null ) {
117                            s = layer.getLayer().getStyleList().getCurrentStyle().getLegendURL().getOnlineResource();
118                        }
119                        sb.append( "{'text' : " );
120                        sb.append( "'" ).append( layer.getTitle() ).append( "'," );
121                        sb.append( "'id' : '" ).append( layer.getLayer().getExtension().getIdentifier() ).append( "'," );
122                        if ( s != null ) {
123                            sb.append( "'img' : '" ).append( s.toExternalForm() ).append( "'," );
124                        }
125                        if ( layer.getLayer().getAbstract() != null ) {
126                            sb.append( "'qtip': '" ).append( layer.getLayer().getAbstract() ).append( "'," );
127                        } else {
128                            sb.append( "'qtip': '" ).append( layer.getTitle() ).append( "'," );
129                        }
130                        if ( scale < layer.getLayer().getExtension().getMinScaleHint()
131                             || scale > layer.getLayer().getExtension().getMaxScaleHint() ) {
132                            sb.append( "'disabled': true," );
133                        }
134                        sb.append( "'checked': " ).append( layer.isHidden() ? "false," : "true," );
135                        sb.append( "'leaf' : true, 'cls' : 'file'}" );
136                        if ( i < mme.size() - 1 ) {
137                            sb.append( ',' );
138                        }
139                    } else {
140                        LayerGroup lg = (LayerGroup) mme.get( i );
141                        sb.append( "{'text' : " );
142                        sb.append( "'" ).append( lg.getTitle() ).append( "'," );
143                        sb.append( "'id' : '" ).append( lg.getIdentifier() ).append( "'," );
144                        sb.append( "'checked': " ).append( !lg.isHidden() ).append( "," );
145                        sb.append( "'expanded': " ).append( lg.isExpanded() ).append( "," );
146                        sb.append( "'leaf' : false, 'cls' : 'folder' " );
147                        appendChildren( sb, lg );
148                        sb.append( "}" );
149                        if ( i < mme.size() - 1 ) {
150                            sb.append( ',' );
151                        }
152                    }
153                }
154                sb.append( "]" );
155            }
156    
157        }
158    
159    }