| 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.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

/**

 * Class to read and write data to a dbase III format file. Creation date:

 * (5/15/2001 5:15:13 PM)

 */

public class DbaseFileNIO {

        // Header information for the DBase File

        private DbaseFileHeaderNIO myHeader;

        private FileInputStream fin;

        private FileChannel channel;

        private ByteBuffer buffer;

        /**

         * Retrieve number of records in the DbaseFile

         *

         * @return N?mero de registros.

         */

        public int getRecordCount() {

                return myHeader.getNumRecords();

        }

        /**

         * Devuelve el n?mero de fields.

         *

         * @return N?mero de fields.

         */

        public int getFieldCount() {

                return myHeader.getNumFields();

        }

        /**

         * Devuelve el valor de un boolean a partir de su n?mero de fila y de

         * field.

         *

         * @param rowIndex N?mero de fila.

         * @param fieldId N?mero columna.

         *

         * @return boolean.

         */

        public boolean getBooleanFieldValue(int rowIndex, int fieldId) {

                int recordOffset = (myHeader.getRecordLength() * rowIndex) +

                        myHeader.getHeaderLength() + 1;

                //Se calcula el offset del campo

                int fieldOffset = 0;

                for (int i = 0; i < (fieldId - 1); i++) {

                        fieldOffset += myHeader.getFieldLength(i);

                }

                buffer.position(recordOffset + fieldOffset);

                char bool = (char) buffer.get();

                return ((bool == 't') || (bool == 'T') || (bool == 'Y') ||

                (bool == 'y'));

        }

        /**

         * Devuelve el String a partir del n?mero de fila y columna.

         *

         * @param rowIndex N?mero de fila.

         * @param fieldId N?mero de columna.

         *

         * @return String.

         */

        public String getStringFieldValue(int rowIndex, int fieldId) {

                int recordOffset = (myHeader.getRecordLength() * rowIndex) +

                        myHeader.getHeaderLength() + 1;

                //Se calcula el offset del campo

                int fieldOffset = 0;

                for (int i = 0; i < fieldId; i++) {

                        fieldOffset += myHeader.getFieldLength(i);

                }

                buffer.position(recordOffset + fieldOffset);

                byte[] data = new byte[myHeader.getFieldLength(fieldId)];

                buffer.get(data);

                return new String(data);

        }

        /**

         * Devuelve el Number a partir de una fila y columna.

         *

         * @param rowIndex N?mero fila.

         * @param fieldId N?mero columna.

         *

         * @return Number.

         */

        public Number getNumberFieldValue(int rowIndex, int fieldId) {

                //System.out.println("rowIndex = "+rowIndex+ " , "+"fieldId = "+fieldId);

                int recordOffset = (myHeader.getRecordLength() * rowIndex) +

                        myHeader.getHeaderLength() + 1;

                //Se calcula el offset del campo

                int fieldOffset = 0;

                for (int i = 0; i < fieldId; i++) {

                        fieldOffset += myHeader.getFieldLength(i);

                }

                buffer.position(recordOffset + fieldOffset);

                byte[] data = new byte[myHeader.getFieldLength(fieldId)];

                buffer.get(data);

                String s = new String(data);

                s = s.trim();

                if (getFieldType(fieldId) == 'N') {

                        Object tempObject = Double.valueOf(s);

                        return new Double(tempObject.toString());

                } else {

                        Object tempObject = Integer.valueOf(s);

                        return new Integer(tempObject.toString());

                }

                //return 0;

        }

        // Retrieve the record at the given index

        /*    public Object[] getRecord(long inIndex) throws IOException {

           long nRecordOffset = (myHeader.getRecordLength() * inIndex) +

               myHeader.getHeaderLength();

           // retrieve the record length

           int tempNumFields = myHeader.getNumFields();

           // storage for the actual values

           Object[] tempRow = new Object[tempNumFields];

               buffer.position((int) nRecordOffset);

               // read the deleted flag

               char tempDeleted = (char) buffer.get();

               // read the record length

               int tempRecordLength = 1; // for the deleted character just read.

               // read the Fields

               for (int j = 0; j < tempNumFields; j++) {

                   // find the length of the field.

                   int tempFieldLength = myHeader.getFieldLength(j);

                   tempRecordLength = tempRecordLength + tempFieldLength;

                   // find the field type

                   char tempFieldType = myHeader.getFieldType(j);

                   //System.out.print("Reading Name="+myHeader.getFieldName(j)+" Type="+tempFieldType +" Length="+tempFieldLength);

                   // read the data.

                   Object tempObject = null;

                   switch (tempFieldType) {

                   case 'L': // logical data type, one character (T,t,F,f,Y,y,N,n)

                       char tempChar = (char) buffer.get();

                       if ((tempChar == 'T') || (tempChar == 't') ||

                               (tempChar == 'Y') || (tempChar == 'y')) {

                           tempObject = new Boolean(true);

                       } else {

                           tempObject = new Boolean(false);

                       }

                       break;

                   case 'C': // character record.

                       byte[] sbuffer = new byte[tempFieldLength];

                                           buffer.get(sbuffer);

                       tempObject = new String(sbuffer, "ISO-8859-1").trim();

                       break;

                   case 'D': // date data type.

                       byte[] dbuffer = new byte[8];

                                           buffer.get(dbuffer);

                       String tempString = new String(dbuffer, 0, 4);

                       try {

                           int tempYear = Integer.parseInt(tempString);

                           tempString = new String(dbuffer, 4, 2);

                           int tempMonth = Integer.parseInt(tempString) - 1;

                           tempString = new String(dbuffer, 6, 2);

                           int tempDay = Integer.parseInt(tempString);

                           Calendar c = Calendar.getInstance();

                           c.set(Calendar.YEAR, tempYear);

                           c.set(Calendar.MONTH, tempMonth);

                           c.set(Calendar.DAY_OF_MONTH, tempDay);

                           tempObject = c.getTime();

                       } catch (NumberFormatException e) {

                       }

                       break;

                   case 'M': // memo field.

                       byte[] mbuffer = new byte[10];

                                           buffer.get(mbuffer);

                       break;

                   case 'N': // number

                   case 'F': // floating point number

                       byte[] fbuffer = new byte[tempFieldLength];

                                           buffer.get(fbuffer);

                       try {

                           tempString = new String(fbuffer);

                           tempObject = Double.valueOf(tempString.trim());

                       } catch (NumberFormatException e) {

                       }

                       break;

                   default:

                       byte[] defbuffer = new byte[tempFieldLength];

                                           buffer.get(defbuffer);

                       System.out.println("Do not know how to parse Field type " +

                           tempFieldType);

                   }

                   tempRow[j] = tempObject;

                   //                                System.out.println(" Data="+tempObject);

               }

               // ensure that the full record has been read.

               if (tempRecordLength < myHeader.getRecordLength()) {

                   byte[] tempbuff = new byte[myHeader.getRecordLength() -

                       tempRecordLength];

                   buffer.get(tempbuff);

                   /* if (tempTelling){

                           System.out.println("DBF File has "+(myHeader.getRecordLength()-tempRecordLength)+" extra bytes per record");

                           tempTelling = false;

                   } */

        /*           }

           return tempRow;

           }

         */

        /**

         * Retrieve the name of the given column.

         *

         * @param inIndex ?ndice.

         *

         * @return nombre del campo.

         */

        public String getFieldName(int inIndex) {

                return myHeader.getFieldName(inIndex).trim();

        }

        /**

         * Retrieve the type of the given column.

         *

         * @param inIndex ?ndice.

         *

         * @return tipo de campo.

         */

        public char getFieldType(int inIndex) {

                return myHeader.getFieldType(inIndex);

        }

        /**

         * Retrieve the length of the given column.

         *

         * @param inIndex indice.

         *

         * @return longitud del field.

         */

        public int getFieldLength(int inIndex) {

                return myHeader.getFieldLength(inIndex);

        }

        /*

         * Retrieve the value of the given column as string.

         *

         * @param idField DOCUMENT ME!

         * @param idRecord DOCUMENT ME!

         *

         * @return DOCUMENT ME!

         *

                 public Object getFieldValue(int idField, long idRecord) throws IOException {

                     Object[] tmpReg = getRecord(idRecord);

                     return tmpReg[idField];

                 }

         */

        /*

         * DOCUMENT ME!

         *

         * @param idField DOCUMENT ME!

         * @param idRecord DOCUMENT ME!

         *

         * @return DOCUMENT ME!

         *

                 public double getFieldValueAsDouble(int idField, int idRecord) throws IOException {

                     Object[] tmpReg = getRecord(idRecord);

                     return (double) Double.parseDouble(tmpReg[idField].toString());

                 }

         */

        /**

         * Retrieve the location of the decimal point.

         *

         * @param inIndex ?ndice.

         *

         * @return localizaci?n.

         */

        public int getFieldDecimalLength(int inIndex) {

                return myHeader.getFieldDecimalCount(inIndex);

        }

        /**

         * read the DBF file into memory.

         *

         * @param file Fichero.

         *

         * @throws IOException

         */

        public void open(File file) throws IOException {

                fin = new FileInputStream(file);

                channel = fin.getChannel();

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

                // create the header to contain the header information.

                myHeader = new DbaseFileHeaderNIO();

                myHeader.readHeader(buffer);

        }

        /**

         * Removes all data from the dataset

         *

         * @throws IOException .

         */

        public void close() throws IOException {

                fin.close();

                channel.close();

        }

}