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