| gvSIG desktop 1

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

 *

 * Copyright (C) 2004 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.catalog.loaders;

import java.util.Map;

import org.gvsig.andami.PluginServices;

import org.gvsig.app.project.documents.view.gui.AbstractViewPanel;

import org.gvsig.catalog.schemas.Resource;

import org.gvsig.fmap.dal.DALLocator;

import org.gvsig.fmap.dal.DataManager;

import org.gvsig.fmap.dal.DataStoreParameters;

import org.gvsig.fmap.dal.exception.InitializeException;

import org.gvsig.fmap.dal.exception.ProviderNotRegisteredException;

import org.gvsig.fmap.mapcontext.MapContextLocator;

import org.gvsig.fmap.mapcontext.MapContextManager;

import org.gvsig.fmap.mapcontext.exceptions.LoadLayerException;

import org.gvsig.fmap.mapcontext.layers.FLayer;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.extensionpoint.ExtensionPoint;

import org.gvsig.tools.extensionpoint.ExtensionPointManager;

/**

 * This class has to be inherited by all the classes

 * that have to load a layer in the current view

 * @author Jorge Piera Llodra (piera_jor@gva.es)

 */

public abstract class GvSigLayerLoader extends LayerLoader{

    private static final MapContextManager MAP_CONTEXT_MANAGER = 

        MapContextLocator.getMapContextManager();

    protected static final DataManager DATA_MANAGER =

        DALLocator.getDataManager();

    private static final ExtensionPointManager EXTENSION_POINT_MANAGER =

        ToolsLocator.getExtensionPointManager();

    /**

     * @param resource

     */

    public GvSigLayerLoader(Resource resource) {

        super(resource);                

    }

    public void loadLayer() throws LayerLoaderException {

        FLayer layer;

        try{

            if (hasSpecificLayer()){

                layer = createLayerFromExtensionPoint();       

            }else{

                layer = createLayerFromParameters();                 

            }

        } catch (Exception e) {

            throw new LayerLoaderException(e.getMessage(), e, getWindowMessage());

        } 

        if (layer != null){

            addLayerToView(layer);

        }

    }        

    private FLayer createLayerFromParameters() throws InitializeException, ProviderNotRegisteredException, LoadLayerException{

        DataStoreParameters dataStoreParameters = createDataStoreParameters();    

        return MAP_CONTEXT_MANAGER.createLayer(getLayerName(), dataStoreParameters);    

    }

    private FLayer createLayerFromExtensionPoint() throws Exception{

        DataStoreParameters dataStoreParameters = createDataStoreParameters();            

        ExtensionPoint extensionPoint = EXTENSION_POINT_MANAGER.get("CatalogLayers");

        return (FLayer)extensionPoint.create(extensionPointName(), new Object[]{dataStoreParameters});

    }

    /**

     * It adds a new layer to the current view

     * @param lyr

     * Layer lo load

     */

    private void addLayerToView(FLayer lyr) {

        AbstractViewPanel theView = 

            (AbstractViewPanel) PluginServices.getMDIManager().getActiveWindow();

        theView.getMapControl().getMapContext().getLayers().addLayer(lyr);                        

    }        

    protected abstract boolean hasSpecificLayer();

    protected String extensionPointName(){

        return null;

    }

    protected abstract DataStoreParameters createDataStoreParameters() throws InitializeException, ProviderNotRegisteredException;

    protected abstract String getLayerName();

}