001 //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_testing/src/org/deegree/portal/portlet/modules/map/actions/portlets/CRSChooserPortletPerform.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
037 package org.deegree.portal.portlet.modules.map.actions.portlets;
038
039 import java.awt.Rectangle;
040 import java.util.HashMap;
041 import java.util.Map;
042
043 import javax.servlet.ServletContext;
044 import javax.servlet.http.HttpServletRequest;
045 import javax.servlet.http.HttpSession;
046
047 import org.apache.jetspeed.portal.Portlet;
048 import org.deegree.framework.log.ILogger;
049 import org.deegree.framework.log.LoggerFactory;
050 import org.deegree.model.crs.CRSFactory;
051 import org.deegree.model.crs.CoordinateSystem;
052 import org.deegree.model.crs.GeoTransformer;
053 import org.deegree.model.spatialschema.Envelope;
054 import org.deegree.model.spatialschema.GeometryFactory;
055 import org.deegree.model.spatialschema.Point;
056 import org.deegree.portal.PortalException;
057 import org.deegree.portal.context.ViewContext;
058 import org.deegree.portal.portlet.modules.actions.AbstractPortletPerform;
059 import org.deegree.portal.portlet.modules.actions.IGeoPortalPortletPerform;
060
061 /**
062 * This Perform class takes care of changing the WMC's bounding box based on a scale paramter. The parameter is passed
063 * in the request. The paramter name is defined by the static member NEW_SCALE_VALUE
064 *
065 * @author <a href="mailto:taddei@lat-lon.de">Ugo Taddei</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
071 public class CRSChooserPortletPerform extends IGeoPortalPortletPerform {
072
073 private static final ILogger LOG = LoggerFactory.getLogger( CRSChooserPortletPerform.class );
074
075 public static final String REQUESTED_CRS = "REQUESTED_CRS";
076
077 public static final String AVAILABLE_CRS = "AVAILABLE_CRS";
078
079 public static final String AVAILABLE_CRS_NAMES = "AVAILABLE_CRS_NAMES";
080
081 private static Map<String, Envelope> homeBBox;
082 static {
083 if ( homeBBox == null ) {
084 homeBBox = new HashMap<String, Envelope>();
085 }
086 }
087
088 /**
089 * private constructor
090 *
091 * @param request
092 * @param portlet
093 * @param sc
094 */
095 CRSChooserPortletPerform( HttpServletRequest request, Portlet portlet, ServletContext sc ) {
096 super( request, portlet, sc );
097 }
098
099 /**
100 * TODO reads the init parameters of the portlet and build the scale list
101 *
102 * @throws PortalException
103 *
104 */
105 void readInitParameter()
106 throws PortalException {
107
108 HttpSession ses = request.getSession();
109 if ( ses.getAttribute( AVAILABLE_CRS ) == null ) {
110 String list = getInitParam( AVAILABLE_CRS );
111 if ( list == null ) {
112 list = "EPSG:31467|GK 3;EPSG:4326|WGS 84";
113 }
114 String[] tmp = list.split( ";" );
115 String[] crs = new String[tmp.length];
116 Map<String, String> crsToNames = new HashMap<String, String>( crs.length );
117
118 for ( int i = 0; i < tmp.length; i++ ) {
119 String[] tmpEntry = tmp[i].split( "\\|" );
120 if ( tmpEntry.length != 2 ) {
121 throw new PortalException( "Parameter is not properly define. An entry must contain a CRS and a "
122 + "name, and they must be separeted by a '|'" );
123 }
124 crs[i] = tmpEntry[0];
125 crsToNames.put( crs[i], tmpEntry[1] );
126 }
127
128 ses.setAttribute( AVAILABLE_CRS, crs );
129 ses.setAttribute( AVAILABLE_CRS_NAMES, crsToNames );
130 }
131
132 }
133
134 /**
135 * Changes the CRS of the current ViewContext. The CRS value is in the parameter under the 'REQUESTED_CRS' key.
136 *
137 * @throws PortalException
138 *
139 */
140 void doCRSChange()
141 throws PortalException {
142
143 String newCRS = parameter.get( REQUESTED_CRS );
144
145 if ( newCRS == null ) {
146 // throw new PortalException( "No crs available in the request. Missing " +
147 // REQUESTED_CRS + " parameter" );
148 return;
149 }
150
151 ViewContext vc = getCurrentViewContext( getInitParam( INIT_MAPPORTLETID ) );
152 if ( vc == null ) {
153 throw new PortalException( "no valid view context available through users session" );
154 }
155
156 // read points/bbox from ViewCOntext
157 Point p0 = vc.getGeneral().getBoundingBox()[0];
158 Point p1 = vc.getGeneral().getBoundingBox()[1];
159
160 CoordinateSystem oldCs = p0.getCoordinateSystem();
161
162 if ( oldCs.getPrefixedName().equals( newCRS ) ) {
163 return;
164 }
165
166
167 // transform home bbox to new CRS
168 Envelope homeEnv = (Envelope) request.getSession().getAttribute( AbstractPortletPerform.SESSION_HOME );
169 if ( homeBBox.get( oldCs.getPrefixedName() ) == null ) {
170 homeBBox.put( oldCs.getPrefixedName(), homeEnv );
171 }
172 try {
173 GeoTransformer trans = new GeoTransformer( newCRS );
174
175 if ( homeBBox.get( newCRS ) == null ) {
176 homeEnv = trans.transform( homeEnv, oldCs );
177 homeEnv = ensureAspectRatio( homeEnv, vc );
178 homeBBox.put( newCRS, homeEnv );
179 } else {
180 homeEnv = homeBBox.get( newCRS );
181 }
182 } catch ( Exception e ) {
183 LOG.logError( e.getMessage(), e );
184 throw new PortalException( e.getMessage(), e );
185 }
186 request.getSession().setAttribute( AbstractPortletPerform.SESSION_HOME, homeEnv );
187
188 try {
189 CoordinateSystem newCs = CRSFactory.create( newCRS );
190
191 Envelope env = GeometryFactory.createEnvelope( p0.getX(), p0.getY(), p1.getX(), p1.getY(), oldCs );
192
193 GeoTransformer gt = new GeoTransformer( newCs );
194 env = gt.transform( env, oldCs );
195 env = ensureAspectRatio( env, vc );
196
197 // set new bbox
198 p0 = GeometryFactory.createPoint( env.getMin().getX(), env.getMin().getY(), newCs );
199 p1 = GeometryFactory.createPoint( env.getMax().getX(), env.getMax().getY(), newCs );
200
201 vc.getGeneral().setBoundingBox( new Point[] { p0, p1 } );
202
203 setCurrentMapContext( vc, getInitParam( INIT_MAPPORTLETID ) );
204
205 } catch ( Exception e ) {
206 LOG.logError( e.getMessage(), e );
207 throw new PortalException( e.getMessage(), e );
208 }
209 }
210
211 private Envelope ensureAspectRatio( Envelope env, ViewContext vc ) {
212 Rectangle rect = vc.getGeneral().getWindow();
213 double ar = ( (double) rect.width ) / ( (double) rect.height );
214 double envAr = env.getWidth() / env.getHeight();
215 if ( ar < envAr ) {
216 double tmp = env.getWidth() / ar;
217 double miny = env.getCentroid().getY() - tmp / 2d;
218 double maxy = env.getCentroid().getY() + tmp / 2d;
219 env = GeometryFactory.createEnvelope( env.getMin().getX(), miny, env.getMax().getX(), maxy,
220 env.getCoordinateSystem() );
221 } else if ( ar > envAr ) {
222 double tmp = env.getHeight() * ar;
223 double minx = env.getCentroid().getX() - tmp / 2d;
224 double maxx = env.getCentroid().getX() + tmp / 2d;
225 env = GeometryFactory.createEnvelope( minx, env.getMin().getY(), maxx, env.getMax().getY(),
226 env.getCoordinateSystem() );
227 }
228 return env;
229 }
230
231 }