| 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 com.iver.cit.gvsig.fmap.drivers.shp;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

import java.nio.channels.FileChannel;

import org.apache.log4j.Logger;

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

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

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

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

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

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

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

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

import com.iver.utiles.bigfile.BigByteBuffer;

/**

 * Driver del formato SHP.

 *

 * @author Francisco Jos? Pe?arrubia

 */

public class IndexedShpDriver implements VectorialFileDriver, BoundedShapes,

        ExternalData {

        private static Logger logger = Logger.getLogger(IndexedShpDriver.class.getName());

        private File file;

        private BigByteBuffer bb;

        private FileChannel channel;

        private FileInputStream fin;

        private int type;

        private long[] m_posShapes;

        private int numReg;

        private Rectangle2D extent;

    private File shxFile;

    private ByteBuffer bbShx;

    private FileChannel channelShx;

    private FileInputStream finShx;

        /**

         * Cierra el fichero.

         *

         * @throws IOException

         *

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

         */

        public void close() throws IOException {

                IOException ret = null;

                try {

                        channel.close();

            channelShx.close();

                } catch (IOException e) {

                        ret = e;

                } finally {

                        try {

                                fin.close();

                        } catch (IOException e1) {

                                ret = e1;

                        }

                }

                if (ret != null) {

                        throw ret;

                }

                else // Si todo ha ido bien, preparamos para liberar memoria.

        {

                    bb = null;

            bbShx = null;

        }

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#open(java.io.File)

         */

        public void open(File f) throws IOException {

                file = f;

                fin = new FileInputStream(f);

                // Open the file and then get a channel from the stream

                channel = fin.getChannel();

                long size = channel.size();

                // Get the file's size and then map it into memory

                // bb = channel.map(FileChannel.MapMode.READ_ONLY, 0, size);

        bb = new BigByteBuffer(channel, FileChannel.MapMode.READ_ONLY);

        finShx = new FileInputStream(getShxFile(f));

        // Open the file and then get a channel from the stream

        channelShx = finShx.getChannel();

        long sizeShx = channelShx.size();

        // Get the file's size and then map it into memory

        // bb = channel.map(FileChannel.MapMode.READ_ONLY, 0, size);

        bbShx = channelShx.map(FileChannel.MapMode.READ_ONLY, 0, sizeShx);

        bbShx.order(ByteOrder.BIG_ENDIAN);

        }

        /**

         * DOCUMENT ME!

         *

         * @param index DOCUMENT ME!

         *

         * @return DOCUMENT ME!

         *

         * @throws IOException

         *

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#getShape(int)

         */

        /* public FShape getShapeByID(int ID) {

           Point2D.Double p = new Point2D.Double();

           Point2D.Double pAnt = null;

           int numParts;

           int numPoints;

           int i;

           int j;

           int numReg;

           int numeroPuntos;

           int hasta;

           int desde;

           Rectangle2D.Double BoundingBox = new Rectangle2D.Double();

                   SHPShape shapeShp=null;

           FShape resulShape = null;

           try {

               bb.position(m_posShapes[ID]);

               bb.order(ByteOrder.LITTLE_ENDIAN);

               int tipoShape = bb.getInt();

               m_shapeType = tipoShape;

               // retrieve that shape.

               // tempRecord.setShape(readShape(tempShapeType, tempContentLength, in));

               if (tipoShape == FConstant.SHAPE_TYPE_POINT) {

                   p = readPoint(bb);

                   resulShape = new FShape(new FPoint(p.getX(),p.getY()),FConstant.SHAPE_TYPE_POINT);

                   //Comprobaci?n punto.

                   //System.err.println("p.x = "+p.x);

                   //System.err.println("p.y = "+p.y);

               } else if ((tipoShape == FConstant.SHAPE_TYPE_POLYLINE) ||

                       (tipoShape == FConstant.SHAPE_TYPE_POLYGON)) {

                   // BoundingBox

                   BoundingBox = readRectangle(bb);

                   numParts = bb.getInt();

                   numPoints = bb.getInt();

                   // part indexes.

                   // Geometry geom = GeometryFactory.toGeometryArray();

                   GeneralPathX elShape = new GeneralPathX(GeneralPathX.WIND_EVEN_ODD,

                           numPoints);

                   int[] tempParts = new int[numParts];

                   for (i = 0; i < numParts; i++) {

                       tempParts[i] = bb.getInt();

                   }

                   j = 0;

                   ///Line2D.Double line2D;

                   FPoint[] points=new FPoint[numPoints];

                   for (i = 0; i < numPoints; i++) {

                           p=readPoint(bb);

                       points[i] = new FPoint(p.x,p.y);

                       // System.out.println("x= " + p.x + " y=" + p.y);

                       // System.out.println("x= " + (float) p.x + " y=" + (float) p.y);

                       if (i == tempParts[j]) {

                           elShape.moveTo(p.x, p.y);

                           if (j < (numParts - 1)) {

                               j++;

                           }

                       } else {

                           elShape.lineTo(p.x, p.y);

                       }

                   }

                   //FGeometry pol=new FPolyLine(points,tempParts,BoundingBox);

                   resulShape = new FShape(tipoShape,elShape);

               } else if (tipoShape == FConstant.SHAPE_TYPE_MULTIPOINT) {

                   // BoundingBox

                   BoundingBox = readRectangle(bb);

                   numPoints = bb.getInt();

                   FPoint[] tempPoints = new FPoint[numPoints];

                   for (i = 0; i < numPoints; i++) {

                           Point2D p2=readPoint(bb);

                       tempPoints[i] = new FPoint(p2.getX(),p2.getY(),0);

                   }

                   FMultiPoint multipoint = new FMultiPoint(tempPoints,BoundingBox);

                   resulShape = new FShape(multipoint,tipoShape);

               } else if (tipoShape == FConstant.SHAPE_TYPE_POINTZ) {

                   FPoint p3d = new FPoint();

                   p3d.read(bb);

                   resulShape = new FShape(p3d,tipoShape);

               } else if ((tipoShape == FConstant.SHAPE_TYPE_POLYLINEZ) ||

                       (tipoShape == FConstant.SHAPE_TYPE_POLYGONZ)) {

                   // BoundingBox

                   BoundingBox = readRectangle(bb);

                   numParts = bb.getInt();

                   numPoints = bb.getInt();

                   // part indexes.

                   // Geometry geom = GeometryFactory.toGeometryArray();

                   GeneralPathX elShape = new GeneralPathX(GeneralPathX.WIND_EVEN_ODD,

                           numPoints);

                   int[] tempParts = new int[numParts];

                   for (i = 0; i < numParts; i++) {

                       tempParts[i] = bb.getInt();

                   }

                   j = 0;

                  //Line2D.Double line2D;

                   FPoint[] points=new FPoint[numPoints];

                   for (i = 0; i < numPoints; i++) {

                       p = readPoint(bb);

                       points[i]=new FPoint(p.x,p.y);

                       if (i == tempParts[j]) {

                           elShape.moveTo(p.x, p.y);

                           if (j < (numParts - 1)) {

                               j++;

                           }

                       } else {

                           elShape.lineTo(p.x, p.y);

                       }

                   }

                   double[] boxZ = new double[2];

                   boxZ[0] = bb.getDouble();

                   boxZ[1] = bb.getDouble();

                   double[] pZ = new double[numPoints];

                   for (i = 0; i < numPoints; i++) {

                       pZ[i] = bb.getDouble();

                   }

                   //FGeometry pol=new FPolyLine(points,tempParts,BoundingBox);

                   resulShape = new FShape(tipoShape, elShape, pZ);

               } else if (tipoShape == FConstant.SHAPE_TYPE_MULTIPOINTZ) {

                   // BoundingBox

                   BoundingBox = readRectangle(bb);

                   numPoints = bb.getInt();

                   FPoint[] tempPoints3D = new FPoint[numPoints];

                   for (i = 0; i < numPoints; i++) {

                       tempPoints3D[i] = new FPoint();

                       tempPoints3D[i].read(bb);

                   }

                   FMultiPoint multipoint3D = new FMultiPoint(tempPoints3D,BoundingBox);

                   resulShape = new FShape(multipoint3D,tipoShape);

               }

           } catch (Exception e) {

               System.err.println("Fallo en getShapeByID. ID=" + ID +

                   " m_posShapes[ID]=" + m_posShapes[ID]);

               System.err.println("getShapeByID: " + e.getMessage());

               e.printStackTrace();

           }

           return resulShape;

           }

         */

        /**

         * Devuelve la geometria a partir de un ?ndice.

         *

         * @param index DOCUMENT ME!

         *

         * @return DOCUMENT ME!

         *

         * @throws IOException DOCUMENT ME!

         */

        public IGeometry getShape(int index) throws IOException {

                Point2D.Double p = new Point2D.Double();

                Point2D.Double pAnt = null;

                int numParts;

                int numPoints;

                int i;

                int j;

                int numReg;

                int numeroPuntos;

                int hasta;

                int desde;

                int shapeType;

                //Rectangle2D.Double BoundingBox;

        // if (m_posShapes[index] == 0)

                // bb.position(m_posShapes[index]);

        bb.position(getPositionForRecord(index));

                bb.order(ByteOrder.LITTLE_ENDIAN);

                ///bb.position(bb.position()+4);

                shapeType = bb.getInt();

                //el shape tal con tema tal y n?mro tal es null

                if (shapeType==SHP.NULL){

                        logger.info("El shape ="+index+ " del tema ="+this.toString()+" es null");

                        return null;

                }

                // retrieve that shape.

                // tempRecord.setShape(readShape(tempShapeType, tempContentLength, in));

                switch (type) {

                        case (SHP.POINT2D):

                                p = readPoint(bb);

                                return ShapeFactory.createPoint2D(p.getX(), p.getY());

                        case (SHP.POLYLINE2D):

                                //BoundingBox = readRectangle(bb);

                                //bb.getDouble();

                                //bb.getDouble();

                                //bb.getDouble();

                                //bb.getDouble();

                                bb.position(bb.position() + 32);

                                numParts = bb.getInt();

                                numPoints = bb.getInt();

                                // part indexes.

                                // Geometry geom = GeometryFactory.toGeometryArray();

                                GeneralPathX elShape = new GeneralPathX(GeneralPathX.WIND_EVEN_ODD,

                                                numPoints);

                                int[] tempParts = new int[numParts];

                                for (i = 0; i < numParts; i++) {

                                        tempParts[i] = bb.getInt();

                                }

                                j = 0;

                                for (i = 0; i < numPoints; i++) {

                                        p = readPoint(bb);

                                        if (i == tempParts[j]) {

                                                elShape.moveTo(p.x, p.y);

                                                if (j < (numParts - 1)) {

                                                        j++;

                                                }

                                        } else {

                                                elShape.lineTo(p.x, p.y);

                                        }

                                }

                                return ShapeFactory.createPolyline2D(elShape);

                        case (SHP.POLYGON2D):

                                //                            BoundingBox = readRectangle(bb);

                                bb.getDouble();

                                bb.getDouble();

                                bb.getDouble();

                                bb.getDouble();

                                numParts = bb.getInt();

                                numPoints = bb.getInt();

                                // part indexes.

                                // Geometry geom = GeometryFactory.toGeometryArray();

                                elShape = new GeneralPathX(GeneralPathX.WIND_EVEN_ODD, numPoints);

                                tempParts = new int[numParts];

                                for (i = 0; i < numParts; i++) {

                                        tempParts[i] = bb.getInt();

                                }

                                j = 0;

                                for (i = 0; i < numPoints; i++) {

                                        p = readPoint(bb);

                                        if (i == tempParts[j]) {

                                                elShape.moveTo(p.x, p.y);

                                                if (j < (numParts - 1)) {

                                                        j++;

                                                }

                                        } else {

                                                elShape.lineTo(p.x, p.y);

                                        }

                                }

                                return ShapeFactory.createPolygon2D(elShape);

                        case (SHP.POINT3D):

                                double x = bb.getDouble();

                                double y = bb.getDouble();

                                double z = bb.getDouble();

                                return ShapeFactory.createPoint3D(x, y, z);

                        case (SHP.POLYLINE3D):

                                bb.position(bb.position() + 32);

                                numParts = bb.getInt();

                                numPoints = bb.getInt();

                                elShape = new GeneralPathX(GeneralPathX.WIND_EVEN_ODD, numPoints);

                                tempParts = new int[numParts];

                                for (i = 0; i < numParts; i++) {

                                        tempParts[i] = bb.getInt();

                                }

                                j = 0;

                                for (i = 0; i < numPoints; i++) {

                                        p = readPoint(bb);

                                        if (i == tempParts[j]) {

                                                elShape.moveTo(p.x, p.y);

                                                if (j < (numParts - 1)) {

                                                        j++;

                                                }

                                        } else {

                                                elShape.lineTo(p.x, p.y);

                                        }

                                }

                                double[] boxZ = new double[2];

                                boxZ[0] = bb.getDouble();

                                boxZ[1] = bb.getDouble();

                                double[] pZ = new double[numPoints];

                                for (i = 0; i < numPoints; i++) {

                                        pZ[i] = bb.getDouble();

                                }

                                return ShapeFactory.createPolyline3D(elShape, pZ);

                        case (SHP.POLYGON3D):

                        bb.position(bb.position() + 32);

                        numParts = bb.getInt();

                        numPoints = bb.getInt();

                        elShape = new GeneralPathX(GeneralPathX.WIND_EVEN_ODD, numPoints);

                        tempParts = new int[numParts];

                        for (i = 0; i < numParts; i++) {

                                tempParts[i] = bb.getInt();

                        }

                        j = 0;

                        for (i = 0; i < numPoints; i++) {

                                p = readPoint(bb);

                                if (i == tempParts[j]) {

                                        elShape.moveTo(p.x, p.y);

                                        if (j < (numParts - 1)) {

                                                j++;

                                        }

                                } else {

                                        elShape.lineTo(p.x, p.y);

                                }

                        }

                        double[] boxpoZ = new double[2];

                        boxpoZ[0] = bb.getDouble();

                        boxpoZ[1] = bb.getDouble();

                        double[] poZ = new double[numPoints];

                        for (i = 0; i < numPoints; i++) {

                                poZ[i] = bb.getDouble();

                        }

                        return ShapeFactory.createPolygon3D(elShape, poZ);

                        case (SHP.MULTIPOINT2D):

                                bb.position(bb.position() + 32);

                                numPoints = bb.getInt();

                                double[] tempX = new double[numPoints];

                                double[] tempY = new double[numPoints];

                                for (i = 0; i < numPoints; i++) {

                                        tempX[i] = bb.getDouble();

                                        tempY[i] = bb.getDouble();

                                }

                                return ShapeFactory.createMultipoint2D(tempX, tempY);

                        case (SHP.MULTIPOINT3D):

                                bb.position(bb.position() + 32);

                                numPoints = bb.getInt();

                                double[] temX = new double[numPoints];

                                double[] temY = new double[numPoints];

                                double[] temZ = new double[numPoints];

                                for (i = 0; i < numPoints; i++) {

                                        temX[i] = bb.getDouble();

                                        temY[i] = bb.getDouble();

                                        //temZ[i] = bb.getDouble();

                                }

                                for (i = 0; i < numPoints; i++) {

                                        temZ[i] = bb.getDouble();

                                }

                                return ShapeFactory.createMultipoint3D(temX, temY, temZ);

                }

                return null;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#getShapeCount()

         */

        public int getShapeCount() {

                return numReg;

        }

        /**

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

         */

        public int getShapeType() {

                int auxType = 0;

                switch (type) {

                        case (SHP.POINT2D):

                        case (SHP.POINT3D):

                                auxType = auxType | FShape.POINT;

                                break;

                        case (SHP.POLYLINE2D):

                        case (SHP.POLYLINE3D):

                                auxType = auxType | FShape.LINE;

                                break;

                        case (SHP.POLYGON2D):

                        case (SHP.POLYGON3D):

                                auxType = auxType | FShape.POLYGON;

                                break;

                        case (SHP.MULTIPOINT2D):

                        case (SHP.MULTIPOINT3D):

                                auxType = auxType | FShape.MULTIPOINT;

                                break;

                }

                return auxType;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#initialize()

         */

        public void initialize() throws IOException {

                // create a new header.

                ShapeFileHeader myHeader = new ShapeFileHeader();

                // read the header

                myHeader.readHeader(bb);

                extent = new Rectangle2D.Double(myHeader.myXmin, myHeader.myYmin,

                                myHeader.myXmax - myHeader.myXmin,

                                myHeader.myYmax - myHeader.myYmin);

                type = myHeader.myShapeType;

                double x = myHeader.myXmin;

                double y = myHeader.myYmin;

                double w = myHeader.myXmax - myHeader.myXmin;

                double h = myHeader.myYmax - myHeader.myYmin;

                if (w == 0) {

                        x -= 0.1;

                        w = 0.2;

                }

                if (h == 0) {

                        y -= 0.1;

                        h = 0.2;

                }

                // String strFichDbf = m_Path.toLowerCase().replaceAll("\\.shp", ".dbf");

                String strFichDbf = file.getAbsolutePath().replaceAll("\\.shp", ".dbf");

                strFichDbf = strFichDbf.replaceAll("\\.SHP", ".DBF");

                DbaseFileNIO m_FichDbf = new DbaseFileNIO();

                m_FichDbf.open(new File(strFichDbf));

                numReg = m_FichDbf.getRecordCount();

                m_posShapes = new long[numReg];

                // read the records.

                /* int tempCurrentLength = myHeader.getHeaderLength();

                int numReg = 0;

                long pos1;

                while (tempCurrentLength < myHeader.myFileLength) {

                        // read the record header

                        // ShapeFileRecord tempRecord = new ShapeFileRecord();

                        // Bytes 0 to 4 represent the record number in the file, these may be out of order.

                        bb.order(ByteOrder.BIG_ENDIAN);

                        // tempRecord.setIndex(in.readInt());

                        bb.getInt();

                        // read the content length of this record in 16 bit words, excluding the index.

                        // in.setLittleEndianMode(false);

                        int tempContentLength = bb.getInt();

                        pos1 = bb.position();

                        m_posShapes[numReg] = bb.position();

                        // Posicionamos

                        bb.position((pos1 + (2 * tempContentLength)));

                        numReg = numReg + 1;

                        // update the current length the 4 is for the index, and content length.

                        tempCurrentLength = tempCurrentLength + 4 + tempContentLength;

                } */

        }

        /**

         * Reads the Point from the shape file.

         *

         * @param in ByteBuffer.

         *

         * @return Point2D.

         */

        private Point2D.Double readPoint(BigByteBuffer in) {

                // create a new point

                Point2D.Double tempPoint = new Point2D.Double();

                // bytes 1 to 4 are the type and have already been read.

                // bytes 4 to 12 are the X coordinate

                in.order(ByteOrder.LITTLE_ENDIAN);

                tempPoint.setLocation(in.getDouble(), in.getDouble());

                return tempPoint;

        }

        /**

         * Lee un rect?ngulo del fichero.

         *

         * @param in ByteBuffer.

         *

         * @return Rect?ngulo.

         *

         * @throws IOException

         */

        private Rectangle2D.Double readRectangle(BigByteBuffer in)

                throws IOException {

                Rectangle2D.Double tempRect = new Rectangle2D.Double();

                in.order(ByteOrder.LITTLE_ENDIAN);

                tempRect.x = in.getDouble();

                tempRect.y = in.getDouble();

                tempRect.width = in.getDouble() - tempRect.x;

                if (tempRect.width == 0) {

                        tempRect.width = 0.2;

                        tempRect.x -= 0.1;

                }

                tempRect.height = in.getDouble() - tempRect.y;

                if (tempRect.height == 0) {

                        tempRect.height = 0.2;

                        tempRect.y -= 0.1;

                }

                return tempRect;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#getFullExtent()

         */

        public Rectangle2D getFullExtent() throws IOException {

                return extent;

        }

        /**

         * Obtiene el extent del shape a partir de un ?ndice.

         *

         * @param index ?ndice.

         *

         * @return Rect?ngulo.

         *

         * @throws IOException

         *

         * @see com.iver.cit.gvsig.fmap.drivers.BoundedShapes#getShapeBounds()

         */

        public Rectangle2D getShapeBounds(int index) throws IOException {

                Point2D p = new Point2D.Double();

                Rectangle2D BoundingBox = new Rectangle2D.Double();

                bb.position(getPositionForRecord(index));

                bb.order(ByteOrder.LITTLE_ENDIAN);

                int tipoShape = bb.getInt();

                if (tipoShape != SHP.NULL) {

                        type = tipoShape;

                }

                // retrieve that shape.

                // tempRecord.setShape(readShape(tempShapeType, tempContentLength, in));

                switch (tipoShape) {

                        case (SHP.POINT2D):

                        case (SHP.POINT3D):

                                p = readPoint(bb);

                                BoundingBox = new Rectangle2D.Double(p.getX() - 0.1,

                                                p.getY() - 0.1, 0.2, 0.2);

                                break;

                        case (SHP.POLYLINE2D):

                        case (SHP.POLYGON2D):

                        case (SHP.MULTIPOINT2D):

                        case (SHP.POLYLINE3D):

                        case (SHP.POLYGON3D):

                        case (SHP.MULTIPOINT3D):

                                // BoundingBox

                                BoundingBox = readRectangle(bb);

                                break;

                }

                return BoundingBox;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#accept(java.io.File)

         */

        public boolean accept(File f) {

                return (f.getName().toUpperCase().endsWith("SHP"));

        }

        /**

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

         */

        public String getName() {

                return "gvSIG indexed shp driver";

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#getDataDriverName()

         */

        public String getDataDriverName() {

                return "gdbms dbf driver";

        }

        /**

         * @see com.iver.cit.gvsig.fmap.drivers.VectorialFileDriver#getDataFile(java.io.File)

         */

        public File getDataFile(File f) {

                String str = f.getAbsolutePath();

                return new File(str.substring(0, str.length() - 3) + "dbf");

        }

    public File getShxFile(File f) {

        String str = f.getAbsolutePath();

        return new File(str.substring(0, str.length() - 3) + "shx");

    }

        /* (non-Javadoc)

         * @see com.iver.cit.gvsig.fmap.drivers.BoundedShapes#getShapeType(int)

         */

        public int getShapeType(int index) {

                // Por ahora todos los fichero .shp contienen

                // entidades del mismo tipo. Si trabajamos con

                // alguno mixto, tendremos que cambiar esta funci?n.

                return getShapeType();

        }

    /* (non-Javadoc)

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

     */

    public DriverAttributes getDriverAttributes() {

        // TODO Auto-generated method stub

        return null;

    }

    private long getPositionForRecord(int numRec)

    {

        // shx file has a 100 bytes header, then, records

        // 8 bytes length, one for each entity.

        // first 4 bytes are the offset

        // next 4 bytes are length

        int posIndex = 100 + (numRec * 8);

        // bbShx.position(posIndex);

        long pos = 8 + 2*bbShx.getInt(posIndex);

        return pos;

    }

}