001 // $HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_testing/src/org/deegree/portal/standard/wms/control/HighlightingInfoListener.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;
037
038 import java.io.InputStreamReader;
039 import java.net.URL;
040
041 import javax.servlet.http.HttpServletRequest;
042 import javax.servlet.http.HttpSession;
043
044 import org.deegree.enterprise.control.FormEvent;
045 import org.deegree.enterprise.control.RPCMember;
046 import org.deegree.enterprise.control.RPCMethodCall;
047 import org.deegree.enterprise.control.RPCParameter;
048 import org.deegree.enterprise.control.RPCStruct;
049 import org.deegree.enterprise.control.RPCWebEvent;
050 import org.deegree.framework.util.CharsetUtils;
051 import org.deegree.framework.util.NetWorker;
052 import org.deegree.framework.util.StringTools;
053 import org.deegree.model.feature.FeatureCollection;
054 import org.deegree.model.feature.GMLFeatureCollectionDocument;
055 import org.deegree.model.spatialschema.GeometryFactory;
056 import org.deegree.model.spatialschema.Position;
057 import org.deegree.portal.PortalException;
058 import org.deegree.portal.context.LayerExtension;
059 import org.deegree.portal.context.ViewContext;
060
061 /**
062 * This class is for accessing informations about the highlighted polygons A new WFS GetFeature request will be created
063 * and performed
064 *
065 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
066 * @author last edited by: $Author: mschneider $
067 *
068 * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
069 */
070 public class HighlightingInfoListener extends AbstractMapListener {
071
072 /**
073 *
074 * @param event
075 */
076 @Override
077 public void actionPerformed( FormEvent event ) {
078
079 // default actions
080 super.actionPerformed( event );
081 RPCWebEvent rpc = (RPCWebEvent) event;
082 RPCMethodCall mc = rpc.getRPCMethodCall();
083 RPCParameter[] para = mc.getParameters();
084 RPCStruct struct = (RPCStruct) para[0].getValue();
085
086 FeatureCollection fc = null;
087 try {
088 // get boundingbox of the request
089 RPCMember member = struct.getMember( "boundingBox" );
090 String tmp = (String) member.getValue();
091 double[] box = StringTools.toArrayDouble( tmp, "," );
092 // get coordinates for filtering from the request
093 Position[] coords = getCoordinates( struct );
094 // get layers/featuretypes to query
095 String[] queryLayers = getQueryLayers( struct );
096 // create WFS GetFeature request
097 String request = createRequest( queryLayers, coords, box );
098 // get responsible WFS URL
099 URL url = getResponsibleWFS( queryLayers[0] );
100 // get FeatureCollection from WFS
101 fc = performGetFeature( request, url );
102 } catch ( Exception ex ) {
103 gotoErrorPage( "Invalid WCSCapabilityOperations: " + ex.toString() );
104 ex.printStackTrace();
105
106 return;
107 }
108
109 this.getRequest().setAttribute( "HIGHLIGHTINFO", fc );
110
111 }
112
113 /**
114 * gets the layer to be highlighted.
115 */
116 private String[] getQueryLayers( RPCStruct struct ) {
117 RPCMember mem = struct.getMember( "queryLayers" );
118 String tmp = (String) mem.getValue();
119 String[] queryLayers = StringTools.toArray( tmp, ",", false );
120 for ( int i = 0; i < queryLayers.length; i++ ) {
121 int index = queryLayers[i].indexOf( "|" );
122 queryLayers[i] = queryLayers[i].substring( 0, index );
123 }
124 return queryLayers;
125 }
126
127 /**
128 * returns the URL of the WFS that is responsible for accessing the data of the passed layer/featuretype
129 *
130 * @param queryLayer
131 * layer to determine the responsible WFS for data access
132 */
133 private URL getResponsibleWFS( String queryLayer )
134 throws PortalException {
135
136 HttpSession session = ( (HttpServletRequest) this.getRequest() ).getSession( true );
137 ViewContext vc = (ViewContext) session.getAttribute( "DefaultMapContext" );
138 if ( vc.getLayerList().getLayer( queryLayer, null ) == null ) {
139 throw new PortalException( "'" + queryLayer + "' is not known by the client!" );
140 }
141 LayerExtension le = vc.getLayerList().getLayer( queryLayer, null ).getExtension();
142 URL wfsurl = null;
143 if ( le.getDataService() == null ) {
144 throw new PortalException( "no WFS registered in MapContext for requested layer. "
145 + "Please contact your responsible administrator." );
146 }
147 if ( !le.getDataService().getServer().getService().equals( "ogc:WFS" ) ) {
148 throw new PortalException( "The responsible services isn't a ogc:WFS; no "
149 + "detail informations are available! " );
150 }
151 wfsurl = le.getDataService().getServer().getOnlineResource();
152
153 return wfsurl;
154 }
155
156 /**
157 * calculates the coordinates of the click event.
158 */
159 private Position[] getCoordinates( RPCStruct struct ) {
160
161 String xs = (String) struct.getMember( "x" ).getValue();
162 String ys = (String) struct.getMember( "y" ).getValue();
163 double[] x = StringTools.toArrayDouble( xs, "," );
164 double[] y = StringTools.toArrayDouble( ys, "," );
165
166 Position[] pos = new Position[x.length];
167
168 for ( int i = 0; i < pos.length; i++ ) {
169 pos[i] = GeometryFactory.createPosition( x[i], y[i] );
170 }
171
172 return pos;
173 }
174
175 /**
176 * creates a WFS GetFeature request from the passed layers (feature types) and the coordinates. The least are used
177 * to create the filter conditions.
178 *
179 * @param queryLayers
180 * names of the layers/featuretypes that will be targeted by the request
181 * @param coords
182 * coordinates to be used as filter conditions (intersect)
183 * @param box
184 * relevant bounding box
185 */
186 private String createRequest( String[] queryLayers, Position[] coords, double[] box ) {
187
188 StringBuffer sb = new StringBuffer( 5000 );
189 sb.append( "<?xml version='1.0' encoding='UTF-8'?>" );
190 sb.append( "<GetFeature xmlns='http://www.opengis.net/wfs' " );
191 sb.append( "xmlns:ogc='http://www.opengis.net/ogc' " );
192 sb.append( "xmlns:gml='http://www.opengis.net/gml' " );
193 sb.append( "service='WFS' version='1.0.0' outputFormat='GML2'>" );
194 sb.append( "<Query typeName='" + queryLayers[0] + "'>" );
195
196 sb.append( "<ogc:Filter><ogc:And>" );
197 if ( coords.length > 1 )
198 sb.append( "<ogc:Or>" );
199
200 for ( int k = 0; k < coords.length; k++ ) {
201 sb.append( "<ogc:Intersects><ogc:PropertyName>GEOM</ogc:PropertyName>" );
202 sb.append( "<gml:Point><gml:coordinates>" ).append( coords[k].getX() ).append( ',' );
203 sb.append( coords[k].getY() ).append( "</gml:coordinates>" );
204 sb.append( "</gml:Point></ogc:Intersects>" );
205 }
206
207 if ( coords.length > 1 )
208 sb.append( "</ogc:Or>" );
209
210 sb.append( "<ogc:BBOX><ogc:PropertyName>GEOM</ogc:PropertyName>" );
211 sb.append( "<gml:Box><gml:coordinates>" ).append( box[0] ).append( ',' ).append( box[1] );
212 sb.append( ' ' ).append( box[2] ).append( ',' ).append( box[3] );
213 sb.append( "</gml:coordinates>" ).append( "</gml:Box></ogc:BBOX>" );
214 sb.append( "</ogc:And></ogc:Filter></Query></GetFeature>" );
215
216 return sb.toString();
217 }
218
219 /**
220 * performs a GetFeature request against the responsible WFS
221 */
222 private FeatureCollection performGetFeature( String request, URL wfsURL )
223 throws PortalException {
224
225 FeatureCollection fc = null;
226 try {
227 NetWorker nw = new NetWorker( CharsetUtils.getSystemCharset(), wfsURL, request );
228 InputStreamReader isr = new InputStreamReader( nw.getInputStream(), CharsetUtils.getSystemCharset() );
229 GMLFeatureCollectionDocument doc = new GMLFeatureCollectionDocument();
230 doc.load( isr, wfsURL.toString() );
231 fc = doc.parse();
232 } catch ( Exception e ) {
233 throw new PortalException( "couldn't perform GetFeature request", e );
234 }
235
236 return fc;
237 }
238
239 }