Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package org.gvsig.labeling.placements;

import java.util.ArrayList;

import java.util.Iterator;

import org.apache.log4j.Logger;

import org.gvsig.symbology.fmap.labeling.placements.CannotPlaceLabel;

import org.gvsig.symbology.fmap.labeling.placements.CompoundLabelPlacement;

import org.gvsig.symbology.fmap.labeling.placements.ILabelPlacement;

import org.gvsig.symbology.fmap.labeling.placements.LinePlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.MultiShapePlacement;

import org.gvsig.symbology.fmap.labeling.placements.MultiShapePlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.PointPlacementConstraints;

import org.gvsig.symbology.fmap.labeling.placements.PolygonPlacementConstraints;

import com.hardcode.gdbms.engine.data.driver.DriverException;

import com.iver.cit.gvsig.fmap.core.FShape;

import com.iver.cit.gvsig.fmap.rendering.styling.labeling.IPlacementConstraints;

import com.iver.utiles.IPersistence;

import com.iver.utiles.NotExistInXMLEntity;

import com.iver.utiles.XMLEntity;

/**

 *

 * PlacementManager.java

 *

 *

 * @author jaume dominguez faus - jaume.dominguez@iver.es Jan 3, 2008

 *

 */

public class PlacementManager {

        private static Logger logger = Logger.getLogger(PlacementManager.class.getName());

        private static ArrayList<Class<?>> installedLabelPlacements = new ArrayList<Class<?>>();

        private static ArrayList<ILabelPlacement> availableLabelPlacements;

        private static final CannotPlaceLabel cantPlaceLabel = new CannotPlaceLabel();

        private PlacementManager() {}

        public static ILabelPlacement getPlacement(IPlacementConstraints placementConstraints, int shapeType) {

                ArrayList<ILabelPlacement> suitablePlacements = new ArrayList<ILabelPlacement>();

                if (placementConstraints.getClass().equals(MultiShapePlacementConstraints.class)) {

                        MultiShapePlacementConstraints msp = (MultiShapePlacementConstraints) placementConstraints;

                        return new MultiShapePlacement(

                                        getPlacement(msp.getPointConstraints(),   FShape.POINT),

                                        getPlacement(msp.getLineConstraints(),    FShape.LINE),

                                        getPlacement(msp.getPolygonConstraints(), FShape.POLYGON)

                                        );

                } else {

                        for (Iterator<ILabelPlacement> iterator = getAvailablePlacements().iterator(); iterator.hasNext();) {

                                ILabelPlacement placement = iterator.next();

                                if (placement.isSuitableFor(placementConstraints, shapeType)) {

                                        suitablePlacements.add(placement);

                                }

                        }

                        if (suitablePlacements.size() == 0)

                                return cantPlaceLabel;

                        else if (suitablePlacements.size() == 1)

                                return suitablePlacements.get(0);

                        else

                                return new CompoundLabelPlacement(

                                                (ILabelPlacement[]) suitablePlacements.

                                                toArray(new ILabelPlacement[suitablePlacements.size()]));

                }

        }

        public static void addLabelPlacement(Class<?> labelPlacementClass) {

//                if (!labelPlacementClass.isInstance(ILabelPlacement.class))

//                throw new IllegalArgumentException(

//                        labelPlacementClass.getName()+" is not an valid label placement algorithm.");

                installedLabelPlacements.add(labelPlacementClass);

                // invalidate current list of available placements

                if (availableLabelPlacements != null)

                        availableLabelPlacements.clear();

                availableLabelPlacements = null;

        }

        private static ArrayList<ILabelPlacement> getAvailablePlacements() {

                if (availableLabelPlacements == null) {

                        availableLabelPlacements = new ArrayList<ILabelPlacement>(installedLabelPlacements.size());

                        for (Iterator<Class<?>> iterator = installedLabelPlacements.iterator(); iterator.hasNext();) {

                                Class<?> clazz = null;

                                try {

                                        clazz = iterator.next();

                                        availableLabelPlacements.add((ILabelPlacement) clazz.newInstance());

                                } catch (Exception e) {

                                        Logger.getLogger(PlacementManager.class).error("couldn't install label placement '"+clazz.getName(), e);

                                }

                        }

                }

                return availableLabelPlacements;

        }

        /**

         * Creates a new instance of placement constraints from a vector layer. The

         * placement constraints are created according the layer shape type.

         * @param layerDest

         * @return

         * @throws DriverException

         */

        public static IPlacementConstraints createPlacementConstraints(int shapeType) {

                switch (shapeType % FShape.Z) {

                case FShape.LINE:

                        return new LinePlacementConstraints();

                case FShape.POLYGON:

                        return new PolygonPlacementConstraints();

                case FShape.POINT:

                case FShape.MULTIPOINT: // TODO (09/01/08) is this correct??? if not fix it also in PlacementProperties (twice), , MarkerPlacementAroundPoint

                        return new PointPlacementConstraints();

                case FShape.MULTI:

                        return new MultiShapePlacementConstraints(

                                        createPlacementConstraints(FShape.POINT),

                                        createPlacementConstraints(FShape.LINE),

                                        createPlacementConstraints(FShape.POLYGON));

                }

                throw new Error("Shape type not yet supported");

//                return null;

        }

        public static IPlacementConstraints createPlacementConstraints(XMLEntity entity) {

                String className = null;

                try {

                        className = entity.getStringProperty("className");

                } catch (NotExistInXMLEntity e) {

                        logger.error("Symbol class name not set.\n" +

                                        " Maybe you forgot to add the" +

                                        " putProperty(\"className\", yourClassName)" +

                                        " call in the getXMLEntity method of your symbol", e);

                }

                Class clazz = null;

                Object obj = null;

                try {

                        clazz = Class.forName(className);

                        obj = clazz.newInstance();

                        ((IPersistence) obj).setXMLEntity(entity);

                } catch (InstantiationException e) {

                        logger.error("Trying to instantiate an interface" +

                                        " or abstract class + "+className+"\n"+e.getMessage(), e);

                } catch (IllegalAccessException e) {

                        logger.error(null, e);

                } catch (ClassNotFoundException e) {

                        logger.error("No class called " + className +

                                        " was found.\nCheck the following.\n<br>" +

                                        "\t- The fullname of the class you're looking " +

                                        "for matches the value in the className " +

                                        "property of the XMLEntity ("+className+").\n<br>" +

                                        "\t- The jar file containing your symbol class is in" +

                                        "the application classpath<br>", e);

                }

                return (IPlacementConstraints) obj;

        }

}