    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_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    }