001 //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_testing/src/org/deegree/portal/portlet/modules/map/actions/portlets/ScaleChooserPortletPerform.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.List;
041
042 import javax.servlet.ServletContext;
043 import javax.servlet.http.HttpServletRequest;
044 import javax.servlet.http.HttpSession;
045
046 import org.apache.jetspeed.portal.Portlet;
047 import org.deegree.framework.log.ILogger;
048 import org.deegree.framework.log.LoggerFactory;
049 import org.deegree.framework.util.MapUtils;
050 import org.deegree.model.crs.CoordinateSystem;
051 import org.deegree.model.spatialschema.Envelope;
052 import org.deegree.model.spatialschema.GeometryFactory;
053 import org.deegree.model.spatialschema.Point;
054 import org.deegree.portal.PortalException;
055 import org.deegree.portal.context.ViewContext;
056 import org.deegree.portal.portlet.modules.actions.IGeoPortalPortletPerform;
057
058 /**
059 * This Perform class takes care of changing the WMC's bounding box based on a scale paramter. The
060 * parameter is passed in the request. The paramter name is defined by the static member
061 * NEW_SCALE_VALUE
062 *
063 * @author <a href="mailto:taddei@lat-lon.de">Ugo Taddei</a>
064 * @author last edited by: $Author: mschneider $
065 *
066 * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
067 */
068
069 public class ScaleChooserPortletPerform extends IGeoPortalPortletPerform {
070
071 private static final ILogger LOG = LoggerFactory.getLogger( ScaleChooserPortletPerform.class );
072
073 public static final String REQUESTED_SCALE_VALUE = "REQUESTED_SCALE_VALUE";
074
075 public static final String AVAILABLE_SCALES = "AVAILABLE_SCALES";
076
077 // TODO make pixel size a property
078 public static final double DEFAULT_PIXEL_SIZE = 0.00028;
079
080 /**
081 * private constructor
082 *
083 * @param request
084 * @param portlet
085 * @param sc
086 */
087 ScaleChooserPortletPerform( HttpServletRequest request, Portlet portlet, ServletContext sc ) {
088 super( request, portlet, sc );
089 }
090
091 public void buildNormalContext()
092 throws PortalException {
093 super.buildNormalContext();
094 readInitParameter();
095 }
096
097 /**
098 * TODO reads the init parameters of the portlet and build the scale list
099 *
100 */
101 private void readInitParameter() {
102
103 HttpSession ses = request.getSession();
104 if ( ses.getAttribute( AVAILABLE_SCALES ) == null ) {
105 String list = getInitParam( AVAILABLE_SCALES );
106 if ( list == null ) {
107 list = "10000;25000;50000;100000;500000;1000000";
108 }
109 String[] tmp = list.split( ";" );
110
111 ses.setAttribute( AVAILABLE_SCALES, tmp );
112 }
113
114 }
115
116 /**
117 * This method changes the scale of the current bounding box
118 *
119 * @throws PortalException
120 *
121 */
122 void doChangeScale()
123 throws PortalException {
124
125 String newScale = parameter.get( REQUESTED_SCALE_VALUE );
126
127 if ( newScale == null ) {
128 // throw new PortalException( "No scale available. Missing " + REQUESTED_SCALE_VALUE
129 // + " parameter" );
130 return;
131 }
132
133 request.setAttribute( REQUESTED_SCALE_VALUE, newScale );
134
135 ViewContext vc = getCurrentViewContext( getInitParam( INIT_MAPPORTLETID ) );
136 if ( vc == null ) {
137 LOG.logDebug( "No VC with PID '" + getInitParam( INIT_MAPPORTLETID ) + "'" );
138 throw new PortalException( "no valid view context available through users session" );
139 }
140
141 // rad need pars from ViewCOntext
142 Point p0 = vc.getGeneral().getBoundingBox()[0];
143 Point p1 = vc.getGeneral().getBoundingBox()[1];
144 CoordinateSystem cs = p0.getCoordinateSystem();
145
146 Rectangle window = vc.getGeneral().getWindow();
147
148 Envelope env = GeometryFactory.createEnvelope( p0.getX(), p0.getY(), p1.getX(), p1.getY(), cs );
149
150 try {
151 double reqScale = Double.parseDouble( newScale );
152
153 double currentScale = MapUtils.calcScale( window.width, window.height, env, cs, DEFAULT_PIXEL_SIZE );
154
155 // calc new envelope
156 env = MapUtils.scaleEnvelope( env, currentScale, reqScale );
157
158 vc.getGeneral().setBoundingBox( env );
159 if ( parameter.get( "MODE" ) != null ) {
160 vc.getGeneral().getExtension().setMode( parameter.get( "MODE" ) );
161 }
162
163 List<Envelope> history = (List<Envelope>) request.getSession().getAttribute( SESSION_HISTORY );
164 int p = (Integer) request.getSession().getAttribute( SESSION_HISTORYPOSITION );
165 Envelope current = history.get( p );
166 if ( current == null || !current.equals( env ) ) {
167 p++;
168 history.add( p, env );
169 request.getSession().setAttribute( IGeoPortalPortletPerform.SESSION_HISTORYPOSITION, p );
170 }
171
172 } catch ( Exception e ) {
173 LOG.logError( e.getMessage(), e );
174 throw new PortalException( e.getMessage() );
175 }
176 }
177
178 }