svn-gvsig-desktop / trunk / libraries / libjni-gdal-macosx / src / es / gva / cit / jbsb / Bsb.java @ 8219
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/**********************************************************************
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* $Id: Bsb.java 8219 2006-10-23 06:25:39Z nacho $
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*
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* Name: Bsb.java
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* Project: JGDAL. Interface java to gdal (Frank Warmerdam).
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* Purpose: Funcions to Open, Close and read data of bsb files.
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* Author: Nacho Brodin, brodin_ign@gva.es
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*
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**********************************************************************/
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package es.gva.cit.jbsb; |
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import java.io.*; |
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import java.util.Date; |
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/**
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* Ofrece las funcionalidades de la librería BSB de C a las
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* aplicaciones de java.
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*
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* @author Nacho Brodin <brodin_ign@gva.es>
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*/
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public class Bsb { |
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/**
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*Objeto que contiene la cabecera del fichero que ha sido cargada
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*desde la librería de C.
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*/
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public BsbInfo g_psInfo = null; |
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/**
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*Objeto que contiene el buffer para una línea que sea leída
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*desde el fichero bsb.
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*/
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public BsbBuffer g_buffer = null; |
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/**
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*Variable que controla que BSBReadLine llame a BSBReadInfoLineNat (1) o a
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*BSBReadLineNat (0).
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*
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*/
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public long cPtr; |
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/**
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* Nombre del fichero abierto
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*/
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private String id; |
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//Definici?n de m?todos nativos
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//********************************************************
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private native BsbInfo bsbOpenNat(String pszFilename); |
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/**
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* Lee la línea del fichero bsb indicada por nScanline manteniendo la BSBInfo sin retornar
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* al cliente java. Esto hace que la llamada tenga un menor coste computacional pero que
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* no sea posible acceder a los datos modificados en cada llamada por la función de libreria
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* de C BSBReadScanLine.
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*
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* @param buf Buffer que contiene la línea leída en cada llamada
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* @param nScanline Número de línea procesada
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*
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* @return 0 si hay error y 1 si la lectura de línea ha sido correcta
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*/
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private native int bsbReadLineNat( long cPtr, |
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BsbBuffer buf, |
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int nScanline,
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String pszFilename);
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private native void bsbCloseNat( long cPtr); |
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//Recubrimiento de los m?todos nativos e interfaz exterior
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//********************************************************
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/**
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*Abre el fichero de im?gen
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*
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*@param pszFilename Nombre del fichero bsb
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*/
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public void bsbOpen(String fil)throws BsbException,IOException{ |
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//Comprobaciones
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File f = new File( fil ); |
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if(!f.exists())
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throw new IOException("El archivo "+fil+" no existe"); |
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if(!f.canRead())
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throw new IOException("El archivo no puede leerse"); |
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//Abrimos el fichero y obtenemos la cabecera
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g_psInfo = bsbOpenNat(fil); |
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if(g_psInfo.cPtr<=0) |
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throw new BsbException("Error en Open de BSB"); |
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//Creamos el buffer
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g_buffer = new BsbBuffer();
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g_buffer.reserva(g_psInfo.nXSize); |
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} |
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/**
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*Lee una l?nea del fichero de imagen
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*
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*@param sScanline -> N?mero de l?nea a procesar
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*@param flag 0: No devuelve la estructura BSBInfo
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* 1: Devuelve a java la BSBInfo modificado
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*/
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public void bsbReadLine(int nScanline)throws BsbException{ |
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int res = 0; |
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if(g_psInfo.cPtr <= 0) |
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throw new BsbException("Error en BSBReadLine(). La llamada BSBOpen no tuvo exito"); |
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res = bsbReadLineNat(g_psInfo.cPtr,g_buffer,nScanline,id); |
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if(res == 0)throw new BsbException(); |
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} |
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/**
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*Cierra el fichero de im?gen y elimina la cabecera
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*/
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public void bsbClose()throws BsbException{ |
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if(g_psInfo.cPtr <= 0) |
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throw new BsbException("Error en BSBClose(). La llamada BSBOpen no tuvo exito"); |
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bsbCloseNat(g_psInfo.cPtr); |
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} |
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static{
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System.loadLibrary("jgdal"); |
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} |
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} |
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