001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/graphics/FeatureLayer.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.graphics;
037    
038    import java.util.ArrayList;
039    import java.util.List;
040    
041    import org.deegree.model.crs.CoordinateSystem;
042    import org.deegree.model.crs.GeoTransformer;
043    import org.deegree.model.feature.Feature;
044    import org.deegree.model.feature.FeatureCollection;
045    import org.deegree.model.feature.FeatureFactory;
046    import org.deegree.model.feature.FeatureProperty;
047    import org.deegree.model.spatialschema.Envelope;
048    import org.deegree.model.spatialschema.Geometry;
049    import org.deegree.model.spatialschema.GeometryFactory;
050    import org.deegree.model.spatialschema.Point;
051    import org.deegree.model.spatialschema.Position;
052    
053    /**
054     * A Layer is a collection of <tt>Feature</tt>s building a thematic 'unit' waterways or country
055     * borders for example. <tt>Feature</tt>s can be added or removed from the layer. A
056     * <tt>Feature</tt> can e changed by a modul of the application using the layer because only
057     * references to <tt>Feature</tt>s are stored within a layer.
058     *
059     *
060     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth</a>
061     * @version $Revision: 19454 $ $Date: 2009-09-01 14:27:33 +0200 (Di, 01 Sep 2009) $
062     */
063    
064    public class FeatureLayer extends AbstractLayer {
065    
066        protected FeatureCollection fc = null;
067    
068        /**
069         * creates a layer with EPSG:4326 as default coordinate system
070         * @param name of the feature
071         * @throws Exception
072         */
073        protected FeatureLayer( String name ) throws Exception {
074            super( name );
075    
076            fc = FeatureFactory.createFeatureCollection( name, 50 );
077    
078            init( fc );
079        }
080    
081        /**
082         * Creates a new FeatureLayer object.
083         *
084         * @param name
085         * @param crs
086         *
087         * @throws Exception
088         */
089        protected FeatureLayer( String name, CoordinateSystem crs ) throws Exception {
090            super( name, crs );
091    
092            fc = FeatureFactory.createFeatureCollection( name, 50 );
093    
094            init( fc );
095        }
096    
097        /**
098         * Creates a new AbstractLayer object.
099         *
100         * @param name
101         * @param crs
102         * @param fc
103         *
104         * @throws Exception
105         */
106        protected FeatureLayer( String name, CoordinateSystem crs, FeatureCollection fc ) throws Exception {
107            super( name, crs );
108            init( fc );
109        }
110    
111        /**
112         * initializes several parameters of the layer and homogenizes the coordinate reference systems
113         * of the features
114         *
115         * @param feature
116         * @throws Exception
117         */
118        private void init( FeatureCollection feature )
119                                throws Exception {
120    
121            this.fc = FeatureFactory.createFeatureCollection( feature.getId(), feature.size() );
122            // create object for coordinate transformation
123            GeoTransformer gt = new GeoTransformer( cs );
124            double minx = 9E99;
125            double maxx = -9E99;
126            double miny = 9E99;
127            double maxy = -9E99;
128            String s1 = cs.getIdentifier();
129            for ( int i = 0; i < feature.size(); i++ ) {
130                Feature feat = feature.getFeature( i );
131                FeatureProperty[] prop = feat.getProperties();
132                FeatureProperty[] propN = new FeatureProperty[prop.length];
133                boolean changed = false;
134                for ( int k = 0; k < prop.length; k++ ) {
135    
136                    Object value = prop[k].getValue();
137                    propN[k] = prop[k];
138                    if ( value instanceof Geometry ) {
139    
140                        CoordinateSystem _cs_ = ( (Geometry) value ).getCoordinateSystem();
141                        String s2 = null;
142                        if ( _cs_ != null ) {
143                            s2 = _cs_.getIdentifier();
144                        } else {
145                            // default reference system
146                            s2 = "EPSG:4326";
147                        }
148    
149                        if ( !s1.equalsIgnoreCase( s2 ) ) {
150                            Geometry transformedGeometry = gt.transform( (Geometry) value );
151                            propN[k] = FeatureFactory.createFeatureProperty( prop[k].getName(), transformedGeometry );
152                            changed = true;
153                            value = transformedGeometry;
154                        }
155                        if ( value instanceof Point ) {
156                            Position pos = ( (Point) value ).getPosition();
157                            if ( pos.getX() > maxx ) {
158                                maxx = pos.getX();
159                            }
160                            if ( pos.getX() < minx ) {
161                                minx = pos.getX();
162                            }
163                            if ( pos.getY() > maxy ) {
164                                maxy = pos.getY();
165                            }
166                            if ( pos.getY() < miny ) {
167                                miny = pos.getY();
168                            }
169                        } else {
170                            Envelope en = ( (Geometry) value ).getEnvelope();
171                            if ( en.getMax().getX() > maxx ) {
172                                maxx = en.getMax().getX();
173                            }
174                            if ( en.getMin().getX() < minx ) {
175                                minx = en.getMin().getX();
176                            }
177                            if ( en.getMax().getY() > maxy ) {
178                                maxy = en.getMax().getY();
179                            }
180                            if ( en.getMin().getY() < miny ) {
181                                miny = en.getMin().getY();
182                            }
183                        }
184                    }
185                }
186                if ( changed ) {
187                    FeatureProperty[] fp = new FeatureProperty[propN.length];
188                    for ( int j = 0; j < fp.length; j++ ) {
189                        fp[j] = FeatureFactory.createFeatureProperty( propN[j].getName(), propN[j].getValue() );
190                    }
191                    feat = FeatureFactory.createFeature( feat.getId(), feat.getFeatureType(), fp );
192                }
193                fc.add( feat );
194            }
195    
196            boundingbox = GeometryFactory.createEnvelope( minx, miny, maxx, maxy, null );
197    
198        }
199    
200        /**
201         *
202         *
203         */
204        private void recalculateBoundingbox() {
205    
206            double minx = 9E99;
207            double maxx = -9E99;
208            double miny = 9E99;
209            double maxy = -9E99;
210    
211            for ( int i = 0; i < fc.size(); i++ ) {
212                Geometry[] prop = fc.getFeature( i ).getGeometryPropertyValues();
213                for ( int k = 0; k < prop.length; k++ ) {
214                    if ( prop[k] instanceof Point ) {
215                        Position pos = ( (Point) prop[k] ).getPosition();
216                        if ( pos.getX() > maxx ) {
217                            maxx = pos.getX();
218                        }
219                        if ( pos.getX() < minx ) {
220                            minx = pos.getX();
221                        }
222                        if ( pos.getY() > maxy ) {
223                            maxy = pos.getY();
224                        }
225                        if ( pos.getY() < miny ) {
226                            miny = pos.getY();
227                        }
228                    } else {
229                        Envelope en = ( prop[k] ).getEnvelope();
230                        if ( en.getMax().getX() > maxx ) {
231                            maxx = en.getMax().getX();
232                        }
233                        if ( en.getMin().getX() < minx ) {
234                            minx = en.getMin().getX();
235                        }
236                        if ( en.getMax().getY() > maxy ) {
237                            maxy = en.getMax().getY();
238                        }
239                        if ( en.getMin().getY() < miny ) {
240                            miny = en.getMin().getY();
241                        }
242                    }
243                }
244            }
245    
246            boundingbox = GeometryFactory.createEnvelope( minx, miny, maxx, maxy, null );
247    
248        }
249    
250        /**
251         * returns the feature that matches the submitted id
252         *
253         * @param id
254         * @return feature identified by its id
255         */
256        public Feature getFeatureById( String id ) {
257            return fc.getFeature( id );
258        }
259    
260        /**
261         * returns the feature that matches the submitted id
262         *
263         * @param ids
264         * @return features identified by their id
265         */
266        public Feature[] getFeaturesById( String[] ids ) {
267    
268            List<Feature> list = new ArrayList<Feature>();
269    
270            Feature feature = null;
271    
272            for ( int i = 0; i < fc.size(); i++ ) {
273                feature = fc.getFeature( i );
274    
275                for ( int k = 0; k < ids.length; k++ ) {
276                    if ( feature.getId().equals( ids[k] ) ) {
277                        list.add( feature );
278                        break;
279                    }
280                }
281            }
282    
283            return list.toArray( new Feature[list.size()] );
284        }
285    
286        /**
287         * returns the feature that matches the submitted index
288         *
289         * @param index
290         * @return a feature
291         */
292        public Feature getFeature( int index ) {
293            Feature feature = fc.getFeature( index );
294            return feature;
295        }
296    
297        /**
298         * returns all features
299         *
300         * @return all features as array
301         */
302        public Feature[] getAllFeatures() {
303            return fc.toArray();
304        }
305    
306        /**
307         * adds a feature to the layer
308         *
309         * @param feature
310         * @throws Exception
311         */
312        public void addFeature( Feature feature )
313                                throws Exception {
314            fc.add( feature );
315            recalculateBoundingbox();
316        }
317    
318        /**
319         * adds a feature collection to the layer
320         *
321         * @param featureCollection
322         * @throws Exception
323         */
324        public void addFeatureCollection( FeatureCollection featureCollection )
325                                throws Exception {
326            fc.add( featureCollection );
327            recalculateBoundingbox();
328        }
329    
330        /**
331         * removes a display Element from the layer
332         *
333         * @param feature
334         * @throws Exception
335         */
336        public void removeFeature( Feature feature )
337                                throws Exception {
338            fc.remove( feature );
339            recalculateBoundingbox();
340        }
341    
342        /**
343         * removes the display Element from the layer that matches the submitted id
344         *
345         * @param id
346         * @throws Exception
347         */
348        public void removeFeature( int id )
349                                throws Exception {
350            removeFeature( getFeature( id ) );
351        }
352    
353        /**
354         * returns the amount of features within the layer.
355         *
356         * @return number of contained features
357         */
358        public int getSize() {
359            return fc.size();
360        }
361    
362        /**
363         * sets the coordinate reference system of the MapView. If a new crs is set all geometries of
364         * GeometryFeatures will be transformed to the new coordinate reference system.
365         *
366         * @param crs
367         * @throws Exception
368         */
369        public void setCoordinatesSystem( CoordinateSystem crs )
370                                throws Exception {
371            if ( !cs.equals( crs ) ) {
372                this.cs = crs;
373                init( fc );
374            }
375        }
376    }