| gvSIG desktop 1

package com.iver.cit.gvsig.fmap.layers.order;

import java.util.Map;

import org.apache.log4j.Logger;

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

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

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

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

import com.iver.utiles.XMLEntity;

import com.iver.utiles.extensionPoints.ExtensionPoint;

import com.iver.utiles.extensionPoints.ExtensionPointsSingleton;

/**

 * Implements the default gvSIG behaviour when adding a new layer

 * to a collection.

 * 

 * @author Cesar Martinez Izquierdo <cesar.martinez@iver.es>

 *

 */

public class DefaultOrderManager implements OrderManager {

        protected static final String extensionPointName = "layer.order.manager";

        protected static final String configuredManagerKey = "default.manager";

        protected static final String name = "DefaultOrderManager";

        protected static final String description = "New_layers_are_always_placed_on_top.";

        public int getPosition(FLayers target, FLayer newLayer) {

                return target.getLayersCount();

        }

        public static String getExtensionPointName() {

                return extensionPointName;

        }

        public static String getDefaultManagerKey() {

                return configuredManagerKey;

        }

        public String getClassName() {

                return this.getClass().getName();

        }

        public XMLEntity getXMLEntity() {

                return null;

        }

        public void setXMLEntity(XMLEntity xml) {

        }

        public String getDescription() {

                return Messages.getString(description);

        }

        public String getName() {

                return name;

        }

        public String toString() {

                return getName();

        }

        public String getCode() {

                return getClassName();

        }

        public Object clone() {

                try {

                        return super.clone();

                } catch (CloneNotSupportedException e) {}

                return null;

        }

        public Object create() {

                return this;

        }

        public Object create(Object[] args) {

                return this;

        }

        public Object create(Map args) {

                return this;

        }

        /**

         * Gets the default OrderManager, as configured in the extension point.

         * 

         * @return The default OrderManager, as configured in the extension point,

         * or null if no manager was configured. 

         */

        public static OrderManager getDefaultOrderManager(){

                try {

                        ExtensionPoint ep = 

                                (ExtensionPoint) ExtensionPointsSingleton.getInstance().

                                get(DefaultOrderManager.getExtensionPointName());

                        if (ep!=null) {

                                Object obj = ep.create(DefaultOrderManager.getDefaultManagerKey());

                                if (obj!=null) {

                                        return (OrderManager) obj;                                

                                }

                        }

                }

                catch (Exception ex) {

                        Logger.getLogger(MapContext.class).warn("Error getting default layer order manager", ex);

                }

                // if something goes wrong, just return the fallback default order manager

                return null;

        }

        /**

         * Gets the OrderManager registered as <code>managerCode</code> in the

         * extension point.

         * 

         * @return the OrderManager registered as <code>managerCode</code> in the

         * extension point, or an instance of DefaultOrderManager if not found.

         */

        public static OrderManager getOrderManager(String managerCode){

                try {

                        ExtensionPoint ep = 

                                (ExtensionPoint) ExtensionPointsSingleton.getInstance().

                                get(DefaultOrderManager.getExtensionPointName());

                        if (ep!=null) {

                                Object obj = ep.create(managerCode);

                                if (obj!=null && obj instanceof OrderManager) {

                                        return (OrderManager) obj;                                

                                }

                        }

                }

                catch (InstantiationException e) { // it may happen if the OrderManager is not installed in the system, that's OK

                } catch (IllegalAccessException e) {

                }

                // if something goes wrong, just return the fallback default order manager

                return  new DefaultOrderManager();

        }

}