Application: gvSIG desktop

/* 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 com.iver.cit.gvsig.fmap.layers;

import java.io.File;

import com.hardcode.driverManager.DriverLoadException;

import com.hardcode.gdbms.driver.exceptions.CloseDriverException;

import com.hardcode.gdbms.driver.exceptions.InitializeDriverException;

import com.hardcode.gdbms.driver.exceptions.ReadDriverException;

import com.hardcode.gdbms.engine.data.DataSource;

import com.hardcode.gdbms.engine.data.DataSourceFactory;

import com.hardcode.gdbms.engine.data.NoSuchTableException;

import com.hardcode.gdbms.engine.data.driver.ObjectDriver;

import com.hardcode.gdbms.engine.values.Value;

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

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

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

import com.iver.cit.gvsig.fmap.drivers.ExternalData;

import com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver;

/**

 * Adapta un driver de fichero vectorial a la interfaz vectorial, manteniendo

 * adem?s el estado necesario por una capa vectorial de fichero (el nombre del

 * fichero)

 */

public class VectorialFileAdapter extends VectorialAdapter {

        private boolean driverInitialized = false;

        private File file;

        private SelectableDataSource ds;

        private String dataSourceName;

        /**

         * <code>reference_count</code> lleva un contador de referencias a este

         * adaptador, de forma que si la cuenta de referencias no es cero, no

         * abrimos otra vez el adaptador porque se supone que est? abierto.

         */

        private int reference_count = 0;

        /**

         * Crea un nuevo VectorialFileAdapter.

         *

         * @param file Fichero.

         */

        public VectorialFileAdapter(File file) {

                this.file = file;

        }

        /**

         * Devuelve driver.

         *

         * @return VectorialFileDriver.

         */

        VectorialFileDriver getFileDriver() {

                return (VectorialFileDriver) getDriver();

        }

        /**

         * incrementa el contador de las veces que se ha abierto el fichero.

         * Solamente cuando el contador est? a cero pide al driver que abra el

         * fichero

         * @throws InitializeDriverException

         */

        public synchronized void start() throws ReadDriverException, InitializeDriverException {

                    if (reference_count == 0)

                    {

                                getFileDriver().open(file);

                                if (!driverInitialized) {

                                        getFileDriver().initialize();

                                        driverInitialized = true;

                                }

                                getRecordset().start();

                    }

                        reference_count++;

        }

        /**

         * decrementa el contador de n?mero de aperturas y cuando llega a cero pide

         * al driver que cierre el fichero

         */

        public synchronized void stop() throws ReadDriverException {

                try {

                    if (reference_count == 0)

                    {

                        getFileDriver().close();

                    }

                    else

                        if (reference_count < 0)

                            throw new RuntimeException("Contador de referencias de driver ="

                                    + reference_count + ". Demasiados stop().");

                    reference_count--;

                } catch (CloseDriverException e) {

                        throw new ReadDriverException(getDriver().getName(),e);

                }

        }

        /**

         * Is synchronized to allow thread safe access to features stored

         * in files.

         *

         * @see com.iver.cit.gvsig.fmap.layers.ReadableVectorial#getShape(int)

         */

        public synchronized IGeometry getShape(int index) throws ReadDriverException {

                return getFileDriver().getShape(index);

        }

        /**

         * @see com.iver.cit.gvsig.fmap.layers.ReadableVectorial#getShapeType()

         */

        public int getShapeType() throws ReadDriverException {

                return getFileDriver().getShapeType();

        }

        /**

         * @throws ReadDriverException

         * @see com.iver.cit.gvsig.fmap.layers.VectorialAdapter#getRecordset()

         */

        public SelectableDataSource getRecordset() throws ReadDriverException {

                String name =null;

                try {

                        if (ds == null) {

                                VectorialFileDriver driver = (VectorialFileDriver) getDriver();

                                if (driver instanceof ExternalData) {

                                        ExternalData ed = (ExternalData) driver;

                                        File dataFile = ed.getDataFile(file);

                                        String driverName = ed.getDataDriverName();

                                        name = LayerFactory.getDataSourceFactory().addFileDataSource(driverName,

                                                dataFile.getAbsolutePath());

                                        ds = new SelectableDataSource(LayerFactory.getDataSourceFactory().createRandomDataSource(name, DataSourceFactory.AUTOMATIC_OPENING));

                                } else if (driver instanceof ObjectDriver) {

                                        name = LayerFactory.getDataSourceFactory().addDataSource((ObjectDriver)driver);

                                        ds = new SelectableDataSource(LayerFactory.getDataSourceFactory().createRandomDataSource(name, DataSourceFactory.AUTOMATIC_OPENING));

                                } else {

                                        return null;

                                }

                        }

                } catch (NoSuchTableException e) {

                        throw new RuntimeException(

                                "Error de implementaci?n, se ha a?adido una tabla y luego esa tabla no ha podido ser cargada");

                } catch (DriverLoadException e) {

                        throw new ReadDriverException(name,e);

                }

                return ds;

        }

        /**

         * Devuelve el fichero.

         *

         * @return Fichero.

         */

        public File getFile() {

                return file;

        }

        /**

         * Returns the feature whose index is numReg

         * <br>

         * Is synchronized to do thread safe accessing to features

         * stored in files.

         * @param numReg index of feature

         * @return feature

         *

         */

    public synchronized IFeature getFeature(int numReg) throws ReadDriverException

    {

        IGeometry geom;

        IFeature feat = null;

        geom = getShape(numReg);

        DataSource rs = getRecordset();

        Value[] regAtt = new Value[rs.getFieldCount()];

        for (int fieldId=0; fieldId < rs.getFieldCount(); fieldId++ )

        {

            regAtt[fieldId] =  rs.getFieldValue(numReg, fieldId);

        }

        feat = new DefaultFeature(geom, regAtt, "" + numReg);

        return feat;

    }

}