Application: gvSIG desktop

/*

 * Created on 04-mar-2005

 *

 * 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.drivers.jdbc.postgis;

import java.awt.geom.Rectangle2D;

import java.math.BigDecimal;

import java.nio.ByteBuffer;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.sql.Types;

import java.util.Hashtable;

import java.util.Properties;

import org.apache.log4j.Logger;

import org.postgis.PGbox2d;

import org.postgis.PGbox3d;

import com.hardcode.gdbms.engine.data.edition.DataWare;

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

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

import com.iver.andami.messages.NotificationManager;

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

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

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

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

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

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

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

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

import com.iver.cit.gvsig.fmap.drivers.jdbc.WKBParser2;

import com.iver.cit.gvsig.fmap.edition.EditionException;

import com.iver.cit.gvsig.fmap.edition.IRowEdited;

import com.iver.cit.gvsig.fmap.edition.ISpatialWriter;

import com.iver.cit.gvsig.fmap.edition.IWriteable;

import com.iver.cit.gvsig.fmap.edition.IWriter;

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

/**

 * @author FJP

 *

 * TODO To change the template for this generated type comment go to Window -

 * Preferences - Java - Code Generation - Code and Comments

 */

public class PostGisDriver extends DefaultDBDriver implements ICanReproject, IWriteable {

        private static Logger logger = Logger.getLogger(PostGisDriver.class

                        .getName());

        private static int FETCH_SIZE = 5000;

        private PostGISWriter writer = new PostGISWriter();

        private WKBParser2 parser = new WKBParser2();

        private int fetch_min = -1;

        private int fetch_max = -1;

        private String sqlOrig;

        /**

         * Used by setAbsolutePosition

         */

        private String sqlTotal;

        private String strEPSG = null;

        private String originalEPSG = null;

        private Rectangle2D fullExtent = null;

        private String strAux;

        private String completeWhere;

        private String provCursorName = null;

        int numProvCursors = 0;

        static {

                try {

                        Class.forName("org.postgresql.Driver");

                } catch (ClassNotFoundException e) {

                        throw new RuntimeException(e);

                }

        }

        /**

         *

         */

        public PostGisDriver() {

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialDriver#getDriverAttributes()

         */

        public DriverAttributes getDriverAttributes() {

                return null;

        }

        /*

         * (non-Javadoc)

         *

         * @see com.hardcode.driverManager.Driver#getName()

         */

        public String getName() {

                return "PostGIS JDBC Driver";

        }

        /**

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

         */

        public IGeometry getShape(int index) {

                IGeometry geom = null;

                boolean resul;

                try {

                        setAbsolutePosition(index);

                        // strAux = rs.getString(1);

                        // geom = parser.read(strAux);

                        if (rs != null) {

                                byte[] data = rs.getBytes(1);

                                geom = parser.parse(data);

                        }

                } catch (SQLException e) {

                        e.printStackTrace();

                }

                return geom;

        }

        /**

         * First, the geometry field. After, the rest of fields

         *

         * @return

         */

        /*

         * public String getTotalFields() { String strAux = "AsBinary(" +

         * getLyrDef().getFieldGeometry() + ")"; String[] fieldNames =

         * getLyrDef().getFieldNames(); for (int i=0; i< fieldNames.length; i++) {

         * strAux = strAux + ", " + fieldNames[i]; } return strAux; }

         */

        /**

         * Antes de llamar a esta funci?n hay que haber fijado el workingArea si se

         * quiere usar.

         *

         * @param conn

         */

        public void setData(Connection conn, DBLayerDefinition lyrDef) {

                this.conn = conn;

                // TODO: Deber?amos poder quitar Conneciton de la llamada y meterlo

                // en lyrDef desde el principio.

                lyrDef.setConnection(conn);

                setLyrDef(lyrDef);

                getTableEPSG();

                try {

                        conn.setAutoCommit(false);

                        sqlOrig = "SELECT " + getTotalFields() + " FROM "

                                        + getLyrDef().getTableName() + " "

                                        + getLyrDef().getWhereClause();

                        if (canReproject(strEPSG)) {

                                completeWhere = getCompoundWhere(sqlOrig, workingArea, strEPSG);

                        } else {

                                completeWhere = getCompoundWhere(sqlOrig, workingArea,

                                                originalEPSG);

                        }

                        String sqlAux = sqlOrig + completeWhere + " ORDER BY "

                                        + getLyrDef().getFieldID();

                        completeWhere = getLyrDef().getWhereClause() + completeWhere;

                        sqlTotal = sqlAux;

                        logger.info("Cadena SQL:" + sqlAux);

                        st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,

                                        ResultSet.CONCUR_READ_ONLY);

                        // st.setFetchSize(FETCH_SIZE);

                        st.execute("declare wkb_cursor binary cursor for " + sqlAux);

                        rs = st.executeQuery("fetch forward " + FETCH_SIZE

                                        + " in wkb_cursor");

                        // st.execute("begin");

                        // bCursorActivo = true;

                        // rs = st.executeQuery(sqlOrig);

                        fetch_min = 0;

                        fetch_max = FETCH_SIZE - 1;

                        metaData = rs.getMetaData();

                        doRelateID_FID();

                        writer.setCreateTable(false);

                        writer.setWriteAll(false);

                        writer.initialize(lyrDef);

                } catch (SQLException e) {

                        NotificationManager.addError(

                                        "Error al conectar a la base de datos.", e);

                } catch (EditionException e) {

                        e.printStackTrace();

                        NotificationManager.addError(

                                        "Error inicializando PosGIS Writer.", e);

                }

        }

        /**

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

         */

        public Rectangle2D getFullExtent() {

                if (fullExtent == null) {

                        try {

                                Statement s = conn.createStatement();

                                ResultSet r = s.executeQuery("SELECT extent("

                                                + getLyrDef().getFieldGeometry()

                                                + ") AS FullExtent FROM " + getLyrDef().getTableName()

                                                + " " + getCompleteWhere());

                                r.next();

                                String strAux = r.getString(1);

                                System.out.println("fullExtent = " + strAux);

                                if (strAux.startsWith("BOX3D")) {

                                        PGbox3d regeom = new PGbox3d(strAux);

                                        double x = regeom.getLLB().x;

                                        double y = regeom.getLLB().y;

                                        double w = regeom.getURT().x - x;

                                        double h = regeom.getURT().y - y;

                                        fullExtent = new Rectangle2D.Double(x, y, w, h);

                                } else {

                                        PGbox2d regeom = new PGbox2d(strAux);

                                        double x = regeom.getLLB().x;

                                        double y = regeom.getLLB().y;

                                        double w = regeom.getURT().x - x;

                                        double h = regeom.getURT().y - y;

                                        fullExtent = new Rectangle2D.Double(x, y, w, h);

                                }

                        } catch (SQLException e) {

                                System.err.println(e.getMessage());

                        }

                }

                return fullExtent;

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialDatabaseDriver#getGeometryIterator(java.lang.String)

         */

        public IFeatureIterator getFeatureIterator(String sql)

                        throws com.iver.cit.gvsig.fmap.DriverException {

                PostGisFeatureIterator geomIterator = null;

                try {

                        // st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,

                        // ResultSet.CONCUR_READ_ONLY);

                        if (provCursorName != null) {

                                /* st.execute("BEGIN");

                                st.execute("CLOSE " + provCursorName);

                                bCursorActivo = false;

                                st.execute("COMMIT"); */

                                numProvCursors++;

                        }

                        // st.execute("BEGIN");

                        provCursorName = "wkb_cursor_prov_" + System.currentTimeMillis() + "" + numProvCursors;

                        // st.execute("BEGIN");

                        bCursorActivo = true;

                        // ResultSet rs = st.executeQuery(sql);

                        geomIterator = new PostGisFeatureIterator(conn, provCursorName, sql);

                        geomIterator.setLyrDef(getLyrDef());

                } catch (SQLException e) {

                        e.printStackTrace();

                        throw new DriverException(e);

                        // return null;

                }

                return geomIterator;

        }

        public IFeatureIterator getFeatureIterator(Rectangle2D r, String strEPSG)

                        throws DriverException {

                if (workingArea != null)

                        r = r.createIntersection(workingArea);

                String sqlAux;

                if (canReproject(strEPSG)) {

                        sqlAux = sqlOrig + getCompoundWhere(sqlOrig, r, strEPSG);

                } else {

                        sqlAux = sqlOrig + getCompoundWhere(sqlOrig, r, originalEPSG);

                }

                System.out.println("SqlAux getFeatureIterator = " + sqlAux);

                return getFeatureIterator(sqlAux);

        }

        /**

         * Le pasas el rect?ngulo que quieres pedir. La primera vez es el

         * workingArea, y las siguientes una interseccion de este rectangulo con el

         * workingArea

         *

         * @param r

         * @param strEPSG

         * @return

         */

        private String getCompoundWhere(String sql, Rectangle2D r, String strEPSG) {

                if (r == null)

                        return "";

                double xMin = r.getMinX();

                double yMin = r.getMinY();

                double xMax = r.getMaxX();

                double yMax = r.getMaxY();

                String wktBox = "GeometryFromText('LINESTRING(" + xMin + " " + yMin

                                + ", " + xMax + " " + yMin + ", " + xMax + " " + yMax + ", "

                                + xMin + " " + yMax + ")', " + strEPSG + ")";

                String sqlAux;

                if (getWhereClause().indexOf("WHERE") != -1)

                        sqlAux = getLyrDef().getFieldGeometry() + " && " + wktBox;

                else

                        sqlAux = "WHERE " + getLyrDef().getFieldGeometry() + " && "

                                        + wktBox;

                return sqlAux;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialDatabaseDriver#getConnectionStringBeginning()

         */

        public String getConnectionStringBeginning() {

                return "jdbc:postgresql:";

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.drivers.DefaultDBDriver#getFieldValue(long,

         *      int)

         */

        public Value getFieldValue(long rowIndex, int idField)

                        throws com.hardcode.gdbms.engine.data.driver.DriverException {

                boolean resul;

                // EL ABSOLUTE NO HACE QUE SE VUELVAN A LEER LAS

                // FILAS, ASI QUE MONTAMOS ESTA HISTORIA PARA QUE

                // LO HAGA

                // System.out.println("getShape " + index);

                int index = (int) (rowIndex);

                try {

                        setAbsolutePosition(index);

                        int fieldId = idField + 2;

                        byte[] byteBuf = rs.getBytes(fieldId);

                        if (byteBuf == null)

                                return ValueFactory.createNullValue();

                        else {

                                ByteBuffer buf = ByteBuffer.wrap(byteBuf);

                                if (metaData.getColumnType(fieldId) == Types.VARCHAR)

                                        return ValueFactory.createValue(rs.getString(fieldId));

                                if (metaData.getColumnType(fieldId) == Types.FLOAT)

                                        return ValueFactory.createValue(buf.getFloat());

                                if (metaData.getColumnType(fieldId) == Types.DOUBLE)

                                        return ValueFactory.createValue(buf.getDouble());

                                if (metaData.getColumnType(fieldId) == Types.INTEGER)

                                        return ValueFactory.createValue(buf.getInt());

                                if (metaData.getColumnType(fieldId) == Types.BIGINT)

                                        return ValueFactory.createValue(buf.getLong());

                                if (metaData.getColumnType(fieldId) == Types.BIT)

                                        // TODO

                                        return ValueFactory.createValue(rs.getBoolean(fieldId));

                                if (metaData.getColumnType(fieldId) == Types.DATE)

                                        // TODO

                                        return ValueFactory.createValue(rs.getDate(fieldId));

                                if (metaData.getColumnType(fieldId) == Types.NUMERIC) {

                                        // System.out.println(metaData.getColumnName(fieldId) + " "

                                        // + metaData.getColumnClassName(fieldId));

                                        short ndigits = buf.getShort();

                                        short weight = buf.getShort();

                                        short sign = buf.getShort();

                                        short dscale = buf.getShort();

                                        String strAux;

                                        if (sign == 0)

                                                strAux = "+";

                                        else

                                                strAux = "-";

                                        for (int iDigit = 0; iDigit < ndigits; iDigit++) {

                                                short digit = buf.getShort();

                                                strAux = strAux + digit;

                                                if (iDigit == weight)

                                                        strAux = strAux + ".";

                                        }

                                        strAux = strAux + "0";

                                        String str2;

                                        BigDecimal dec;

                                        dec = new BigDecimal(strAux);

                                        // System.out.println(ndigits + "_" + weight + "_" + dscale

                                        // + "_" + strAux);

                                        // System.out.println(strAux + " Big= " + dec);

                                        return ValueFactory.createValue(dec.doubleValue());

                                }

                        }

                } catch (SQLException e) {

                        throw new com.hardcode.gdbms.engine.data.driver.DriverException(e

                                        .getMessage());

                }

                return ValueFactory.createNullValue();

        }

        public void open() throws com.iver.cit.gvsig.fmap.DriverException {

                /*

                 * try { st = conn.createStatement(); st.setFetchSize(2000); if

                 * (bCursorActivo) close(); st.execute("declare wkb_cursor binary cursor

                 * for " + sqlOrig); rs = st.executeQuery("fetch forward all in

                 * wkb_cursor"); // st.execute("BEGIN"); bCursorActivo = true; } catch

                 * (SQLException e) { e.printStackTrace(); throw new

                 * com.iver.cit.gvsig.fmap.DriverException(e); }

                 */

        }

        private void setAbsolutePosition(int index) throws SQLException {

                // TODO: USAR LIMIT Y ORDER BY, Y HACERLO TAMBI?N PARA

                // MYSQL

                // EL ABSOLUTE NO HACE QUE SE VUELVAN A LEER LAS

                // FILAS, ASI QUE MONTAMOS ESTA HISTORIA PARA QUE

                // LO HAGA

                // System.out.println("getShape " + index + " fetchMin=" + fetch_min + "

                // fetchMax=" + fetch_max);

                if (index < fetch_min) {

                        // rs.close();

                        st.execute("CLOSE wkb_cursor");

                        st.execute("declare wkb_cursor binary cursor for " + sqlTotal);

                        rs = st.executeQuery("fetch forward " + FETCH_SIZE

                                        + " in wkb_cursor");

                        // rs.beforeFirst();

                        // rs = st.executeQuery(sqlOrig);

                        fetch_min = 0;

                        fetch_max = FETCH_SIZE - 1;

                }

                while (index > fetch_max && index != 0) {

                        rs = st.executeQuery("fetch forward " + FETCH_SIZE

                                        + " in wkb_cursor");

                        // rs.next();

                        /*

                         * rs.afterLast(); // forzamos una carga rs.next();

                         */

                        fetch_min = fetch_max + 1;

                        fetch_max = fetch_min + FETCH_SIZE - 1;

                        // System.out.println("fetchSize = " + rs.getFetchSize() + " " +

                        // fetch_min + "-" + fetch_max);

                }

                if (rs != null)

                        rs.absolute(index - fetch_min + 1);

                // rs.absolute(index+1);

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialDatabaseDriver#getGeometryField(java.lang.String)

         */

        public String getGeometryField(String fieldName) {

                return "ASBINARY(" + fieldName + ", 'XDR')";

        }

        /**

         * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#getPrimaryKeys()

         */

        public int[] getPrimaryKeys()

                        throws com.hardcode.gdbms.engine.data.driver.DriverException {

                // TODO Auto-generated method stub

                return null;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialJDBCDriver#getDefaultPort()

         */

        public int getDefaultPort() {

                return 5432;

        }

        /**

         * @see com.hardcode.gdbms.engine.data.driver.ObjectDriver#write(com.hardcode.gdbms.engine.data.edition.DataWare)

         */

        public void write(DataWare arg0)

                        throws com.hardcode.gdbms.engine.data.driver.DriverException {

                // TODO Auto-generated method stub

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.core.ICanReproject#getSourceProjection()

         */

        public String getSourceProjection() {

                if (originalEPSG == null)

                        getTableEPSG();

                return originalEPSG;

        }

        /**

         * Las tablas con geometr?as est?n en la tabla GEOMETRY_COLUMNS y de

         * ah? sacamos en qu? proyecci?n est?n.

         * El problema es que si el usuario hace una vista de esa

         * tabla, no estar? dada de alta aqu? y entonces gvSIG

         * no se entera en qu? proyecci?n est? trabajando (y le

         * ponemos un -1 como mal menor). El -1 implica que luego

         * no podremos reproyectar al vuelo desde la base de datos.

         */

        private void getTableEPSG() {

                try {

                        Statement stAux = conn.createStatement();

                        String sql = "SELECT * FROM GEOMETRY_COLUMNS WHERE F_TABLE_NAME = '"

                                        + getTableName() + "';";

                        ResultSet rs = stAux.executeQuery(sql);

                        rs.next();

                        originalEPSG = "" + rs.getInt("SRID");

                        rs.close();

                } catch (SQLException e) {

                        // TODO Auto-generated catch block

                        originalEPSG = "-1";

                        logger.error(e);

                        e.printStackTrace();

                }

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.core.ICanReproject#getDestProjection()

         */

        public String getDestProjection() {

                return strEPSG;

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.core.ICanReproject#setDestProjection(java.lang.String)

         */

        public void setDestProjection(String toEPSG) {

                this.strEPSG = toEPSG;

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.core.ICanReproject#canReproject(java.lang.String)

         */

        public boolean canReproject(String toEPSGdestinyProjection) {

                // TODO POR AHORA, REPROYECTA SIEMPRE gvSIG.

                return false;

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.drivers.DefaultDBDriver#doRelateID_FID()

         */

        protected void doRelateID_FID() {

                hashRelate = new Hashtable();

                try {

                        String strSQL = "SELECT " + getLyrDef().getFieldID() + " FROM "

                                        + getLyrDef().getTableName() + " "

                                        + getLyrDef().getWhereClause();

                        if (canReproject(strEPSG)) {

                                strSQL = strSQL

                                                + getCompoundWhere(strSQL, workingArea, strEPSG);

                        } else {

                                strSQL = strSQL

                                                + getCompoundWhere(strSQL, workingArea, originalEPSG);

                        }

                        strSQL = strSQL + " ORDER BY " + getLyrDef().getFieldID();

                        Statement s = getConnection().createStatement(

                                        ResultSet.TYPE_SCROLL_INSENSITIVE,

                                        ResultSet.CONCUR_READ_ONLY);

                        int fetchSize = 5000;

                        ResultSet r = s.executeQuery(strSQL);

                        int id = 0;

                        String gid;

                        while (r.next()) {

                                gid = r.getString(1);

                                Value aux = ValueFactory.createValue(gid);

                                hashRelate.put(aux, new Integer(id));

                                // System.out.println("ASOCIANDO CLAVE " + aux + " CON VALOR " + id);

                                id++;

                                // System.out.println("Row " + id + ":" + strAux);

                        }

                        s.close();

                        numReg = id;

                        /*

                         * for (int index = 0; index < getShapeCount(); index++) { Value aux =

                         * getFieldValue(index, idFID_FieldName-2); hashRelate.put(aux, new

                         * Integer(index)); // System.out.println("Row " + index + " clave=" +

                         * aux); }

                         */

                        /*

                         * int index = 0;

                         *

                         * while (rs.next()) { Value aux = getFieldValue(index,

                         * idFID_FieldName-2); hashRelate.put(aux, new Integer(index));

                         * index++; System.out.println("Row " + index + " clave=" + aux); }

                         * numReg = index;

                         */

                        // rs.beforeFirst();

                        /*

                         * } catch (com.hardcode.gdbms.engine.data.driver.DriverException e) { //

                         * TODO Auto-generated catch block e.printStackTrace();

                         */

                } catch (SQLException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                }

        }

        public String getSqlTotal() {

                return sqlTotal;

        }

        /**

         * @return Returns the completeWhere.

         */

        public String getCompleteWhere() {

                return completeWhere;

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.drivers.DefaultDBDriver#close()

         */

        public void close() {

                super.close();

                /*

                 * if (bCursorActivo) { try { // st =

                 * conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,

                 * ResultSet.CONCUR_READ_ONLY); st.execute("CLOSE wkb_cursor_prov"); //

                 * st.close(); } catch (SQLException e) { // TODO Auto-generated catch

                 * block e.printStackTrace(); } bCursorActivo = false; }

                 */

        }

        /*

         * (non-Javadoc)

         *

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialDatabaseDriver#getFeatureIterator(java.awt.geom.Rectangle2D,

         *      java.lang.String, java.lang.String[])

         */

        public IFeatureIterator getFeatureIterator(Rectangle2D r, String strEPSG,

                        String[] alphaNumericFieldsNeeded) throws DriverException {

                try {

                        if (workingArea != null)

                                r = r.createIntersection(workingArea);

                        // if (getLyrDef()==null){

                        // load();

                        // throw new DriverException("Fallo de la conexi?n");

                        // }

                        String strAux = getGeometryField(getLyrDef().getFieldGeometry());

                        boolean found = false;

                        if (alphaNumericFieldsNeeded != null) {

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

                                        strAux = strAux + ", " + alphaNumericFieldsNeeded[i];

                                        if (alphaNumericFieldsNeeded[i].equals(getLyrDef()

                                                        .getFieldID()))

                                                found = true;

                                }

                        }

                        // Nos aseguramos de pedir siempre el campo ID

                        if (found == false)

                                strAux = strAux + ", " + getLyrDef().getFieldID();

                        String sqlProv = "SELECT " + strAux + " FROM "

                                        + getLyrDef().getTableName() + " "

                                        + getLyrDef().getWhereClause();

                        String sqlAux;

                        if (canReproject(strEPSG)) {

                                sqlAux = sqlProv + getCompoundWhere(sqlProv, r, strEPSG);

                        } else {

                                sqlAux = sqlProv + getCompoundWhere(sqlProv, r, originalEPSG);

                        }

                        System.out.println("SqlAux getFeatureIterator = " + sqlAux);

                        return getFeatureIterator(sqlAux);

                } catch (Exception e) {

                        throw new DriverException(e);

                }

        }

        /* public void preProcess() throws EditionException {

                writer.preProcess();

        }

        public void process(IRowEdited row) throws EditionException {

                writer.process(row);

        }

        public void postProcess() throws EditionException {

                writer.postProcess();

        }

        public String getCapability(String capability) {

                return writer.getCapability(capability);

        }

        public void setCapabilities(Properties capabilities) {

                writer.setCapabilities(capabilities);

        }

        public boolean canWriteAttribute(int sqlType) {

                return writer.canWriteAttribute(sqlType);

        }

        public boolean canWriteGeometry(int gvSIGgeometryType) {

                return writer.canWriteGeometry(gvSIGgeometryType);

        }

        public void initialize(ITableDefinition layerDef) throws EditionException {

                writer.setCreateTable(false);

                writer.setWriteAll(false);

                // Obtenemos el DBLayerDefinition a partir del driver

                DBLayerDefinition dbLyrDef = getLyrDef();

                writer.initialize(dbLyrDef);

        }

*/

        public boolean isWritable() {

                return true;

        } 

        public IWriter getWriter() {

                return writer;

        }

}