Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 */

package org.gvsig.geometrymeasurement.app.extension;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.gvsig.andami.PluginServices;

import org.gvsig.andami.messages.NotificationManager;

import org.gvsig.andami.plugins.Extension;

import org.gvsig.andami.ui.mdiManager.IWindow;

import org.gvsig.app.project.documents.table.TableDocument;

import org.gvsig.app.project.documents.table.gui.FeatureTableDocumentPanel;

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

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

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

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

/**

 * Abstract class for Geometry measurement operations extensions.

 * 

 * @author gvSIG Team

 * @version $Id$

 */

public abstract class AbstractGeometryMeasurementExtension extends Extension {

    private static final Logger LOG = LoggerFactory

        .getLogger(AbstractGeometryMeasurementExtension.class);

    public boolean isEnabled() {

        TableDocument tableDocument;

        try {

            tableDocument = getActiveTableDocument();

            return (tableDocument != null && tableDocument.getStore().allowWrite());

        } catch (DataException e) {

            LOG.error("Error getting the table document", e);

        }

        return false;

    }

    public final boolean isVisible() {

        TableDocument tableDocument;

        try {

            tableDocument = getActiveTableDocument();

            if (tableDocument != null) {

                return isVisibleForTable(tableDocument);

            }

        } catch (DataException e) {

            LOG.error("Error getting the table document", e);

        }       

        return false;

    }

    /**

     * Returns if the current extension is visible for the provided 

     * table.

     * 

     * The provided table will be always non null.

     * 

     * @param layer

     *            the active table

     * @return if the extension is visible

     */

    protected abstract boolean isVisibleForTable(TableDocument tableDocument);

    /**

     * Returns the active table document. If the active document is not a table,

     * or if the table has not a geometry, return null.

     * 

     * @return the active table document

     * @throws DataException 

     */

    protected TableDocument getActiveTableDocument() throws DataException {

        IWindow window = PluginServices.getMDIManager().getActiveWindow();

        if (window instanceof FeatureTableDocumentPanel) {

            FeatureTableDocumentPanel table = (FeatureTableDocumentPanel) window;

            TableDocument tableDocument = (TableDocument)table.getDocument();

            if (tableDocument.getStore().getDefaultFeatureType().getDefaultGeometryAttribute() != null){

                return tableDocument;

            }

        }

        return null;

    }

    protected boolean isStoreOfAnyType(TableDocument tableDocument, int[] geomTypes) {

        try {

            FeatureType featureType = tableDocument.getStore().getDefaultFeatureType();

            GeometryType geometryType = featureType.getDefaultGeometryAttribute().getGeomType();

            for (int i = 0; i < geomTypes.length; i++) {

                if (geometryType.isTypeOf(geomTypes[i])) {

                    return true;

                }

            }

        } catch (ReadException e) {

            LOG.error("Error reading the geometry type", e);

        } catch (DataException e) {

            LOG.error("Error reading the geometry type", e);

        }

        return false;

    }

    public void execute(String actionCommand) {

        try {

            TableDocument tableDocument = getActiveTableDocument();

            if (tableDocument == null) {

                return;

            }

            FeatureStore featureStore = tableDocument.getStore();

            execute(actionCommand, featureStore);

        } catch (Exception e) {

            LOG.error("Not possible to create the area field", e);

            NotificationManager.addError(e);

        }

    }

    /**

     * Executes a command for the given {@link FeatureStore}.

     * 

     * @param actionCommand

     *            to execute

     * @param featureStore

     *            to use

     * @throws Exception

     *             if there is an error while executing

     */

    protected abstract void execute(String actionCommand,

        FeatureStore featureStore) throws Exception;

}