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

 */

/* CVS MESSAGES:

*

* $Id: LabelingFactory.java 10436 2007-02-21 07:34:09Z jaume $

* $Log$

* Revision 1.1.2.4  2007-02-21 07:34:08  jaume

* labeling starts working

*

* Revision 1.1.2.3  2007/02/12 15:15:20  jaume

* refactored interval legend and added graduated symbol legend

*

* Revision 1.1.2.2  2007/02/09 07:47:05  jaume

* Isymbol moved

*

* Revision 1.1.2.1  2007/02/02 16:21:24  jaume

* start commiting labeling stuff

*

* Revision 1.1.2.1  2007/01/30 18:10:45  jaume

* start commiting labeling stuff

*

*

*/

package com.iver.cit.gvsig.fmap.rendering.styling;

import org.apache.log4j.Logger;

import com.iver.cit.gvsig.fmap.DriverException;

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

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

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.FLyrVect;

import com.iver.utiles.IPersistance;

import com.iver.utiles.NotExistInXMLEntity;

import com.iver.utiles.XMLEntity;

public class LabelingFactory {

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

        /**

         * Instantiates an object from an instance of XMLEntity. The XMLEntity

         * must follow the XMLEntity contract in IPersistence. It at least must

         * contain a className that allow create objects via instrospection. It

         * also should have the set of attributes that the instantiated object's

         * setXMLEntity(XMLEntity) method expects.

         * @param xml

         * @return

         */

        private static Object createFromXML(XMLEntity xml) {

                String className = null;

                try {

                        className = xml.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);

                        // TODO remove the patch the day we deprecate FSymbol

                        obj = clazz.newInstance();

                        ((IPersistance) obj).setXMLEntity(xml);

                } catch (InstantiationException e) {

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

                                        " or abstract class + "+className, 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 obj;

        }

        /**

         * Creates a new instance of a ILabelingStrategy from an XMLEntity.

         * @param xml

         * @return ILabelingStrategy

         */

        public static ILabelingStrategy createStrategyFromXML(XMLEntity xml) {

                return (ILabelingStrategy) createFromXML(xml);

        }

        /**

         * Creates a new instance of ILabelingMethod from an XMLEntity.

         * @param xml

         * @return ILabelingMethod

         */

        public static ILabelingMethod createMethodFromXML(XMLEntity xml) {

                return (ILabelingMethod) createFromXML(xml);

        }

        /**

         * Creates a default labeling strategy from an XMLEntity.

         * @param layer

         * @return an instance of DefaultStrategy

         * @throws DriverException

         */

        public static ILabelingStrategy createDefaultStrategy(FLayer layer) throws DriverException {

                return new DefaultLabelingStrategy(layer);

        }

        /**

         * Given a layer, a labeling method, a label placements constraints, and a label

         * zoom constraints it will figure out the best ILabelingStrategy that meets all

         * the needs.

         * @param layer, the target layer

         * @param method, the desired methods

         * @param placement, the desired placement constraints

         * @param zoom, the desired zoom constraints

         * @return ILabelingStrategy

         * @throws DriverException

         */

        public static ILabelingStrategy createStrategy(FLayer layer, ILabelingMethod method, IPlacementConstraints placement, IZoomConstraints zoom) throws DriverException {

                if (method == null && placement == null && zoom == null)

                        return createDefaultStrategy(layer);

                return createDefaultStrategy(layer);

                /* solament per a proves, ac? falta muntar el sistema expert que

                 * decidisca quina estrat?gia ?s la millor a partir dels par?metres.

                 */

        }

        /**

         * 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(FLyrVect layerDest) throws DriverException {

                int shapeType = layerDest.getShapeType();

                switch (shapeType) {

                case FShape.LINE:

                        return new LinePlacementConstraints();

                case FShape.POLYGON:

                        return new PolygonPlacementConstraints();

                case FShape.POINT:

                        return new PointPlacementConstraints();

                }

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

        }

}