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.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.Geometry.TYPES;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.type.GeometryType;

import org.gvsig.fmap.geom.type.GeometryTypeNotSupportedException;

import org.gvsig.fmap.geom.type.GeometryTypeNotValidException;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.IPlacementConstraints;

import org.gvsig.tools.exception.DriverException;

import org.gvsig.tools.locator.LocatorException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 *

 * PlacementManager.java

 *

 *

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

 *

 */

public class PlacementManager {

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

        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(),   Geometry.TYPES.POINT),

                                        getPlacement(msp.getLineConstraints(),    Geometry.TYPES.CURVE),

                                        getPlacement(msp.getPolygonConstraints(), Geometry.TYPES.SURFACE)

                                        );

                } 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.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 LocatorException 

         * @throws GeometryTypeNotValidException 

         * @throws GeometryTypeNotSupportedException 

         * @throws DriverException

         */

        public static IPlacementConstraints createPlacementConstraints(int geotype)

                        throws Exception {

                GeometryType geom_gt = GeometryLocator.getGeometryManager().getGeometryType(

                                geotype, Geometry.SUBTYPES.GEOM2D);

                if (geom_gt.getType() == TYPES.POINT ||

                                geom_gt.getType() == TYPES.MULTIPOINT) {

                        return new PointPlacementConstraints();

                } else {

                        if (geom_gt.isTypeOf(TYPES.CURVE) ||

                                        geom_gt.getType() == TYPES.MULTICURVE) {

                                return new LinePlacementConstraints();

                        } else {

                                if (geom_gt.isTypeOf(TYPES.SURFACE) ||

                                                geom_gt.getType() == TYPES.MULTISURFACE) {

                                        return new PolygonPlacementConstraints();

                                } else {

                                        if (geom_gt.getType() == TYPES.GEOMETRY ||

                                        geom_gt.getType() == TYPES.AGGREGATE) {

                                                return new MultiShapePlacementConstraints(

                                                                (PointPlacementConstraints)

                                                                createPlacementConstraints(TYPES.POINT),

                                                                (LinePlacementConstraints)

                                                                createPlacementConstraints(TYPES.CURVE),

                                                                (PolygonPlacementConstraints)

                                                                createPlacementConstraints(TYPES.SURFACE));

                                        }

                                }

                        }

                }                

                logger.error("Unknown geo type in createPlacementConstraints: " + geotype);

                return null;

        }

}