root / trunk / libraries / libjni-mrsid / src / es / gva / cit / jmrsid / MrSIDImageReader.java @ 8460
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/**********************************************************************
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* $Id: MrSIDImageReader.java 8460 2006-10-31 16:26:34Z nacho $
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*
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* Name: MrSIDImageReader.java
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* Project: JMRSID. Interfaz java to MrSID (Lizardtech).
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* Purpose:
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* Author: Nacho Brodin, brodin_ign@gva.es
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*
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**********************************************************************/
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/*Copyright (C) 2004 Nacho Brodin <brodin_ign@gva.es>
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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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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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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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[01] 01-Oct-2005 nbt New call to JNI function MrSIDImageReaderArrayNat to convert name string to char array.
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*/
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package es.gva.cit.jmrsid; |
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import java.io.File; |
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import java.io.IOException; |
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/**
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*
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* @author Nacho Brodin <brodin_ign@gva.es>.<BR> Equipo de desarrollo gvSIG.<BR> http://www.gvsig.gva.es
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* @version 0.0
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* @link http://www.gvsig.gva.es
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*/
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public class MrSIDImageReader extends MrSIDImageReaderBase{ |
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private native long MrSIDImageReaderNat(String pszFilename); |
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private native long MrSIDImageReaderArrayNat(byte[] b); |
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private native void FreeMrSIDImageReaderNat(long cPtr); |
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public MrSIDImageReader(){}
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/**
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* Constructor
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* @param cPtr direcci?n de memoria al objeto MrSIDImageReader de C.
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*/
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public MrSIDImageReader(long cPtr){ |
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this.cPtr=cPtr;
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} |
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/**
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* Destructor
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*/
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protected void finalize(){ |
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this.close();
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} |
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/**
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* Cierra el MrSIDImageReader
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*
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*/
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public void close(){ |
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if(cPtr > 0){ |
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FreeMrSIDImageReaderNat(cPtr); |
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cPtr = -1;
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} |
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} |
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/**
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* Constructor
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*
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* @param pszFilename Nombre del fichero
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* @throws MrSIDException, IOException
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*/
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public MrSIDImageReader(String pszFilename)throws MrSIDException, IOException{ |
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File f = new File( pszFilename ); |
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if(!f.exists())
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throw new IOException("The file "+pszFilename+" don't exists"); |
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if(!f.canRead())
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throw new IOException("I can't read the file"); |
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cPtr=MrSIDImageReaderArrayNat(pszFilename.getBytes()); |
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if(cPtr<0) |
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throw new MrSIDException("Error in MrDID Open"); |
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} |
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/**
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* Obtiene el n?mero de niveles
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*/
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public int getNumLevels()throws MrSIDException{ |
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String os = System.getProperty("os.name").toLowerCase(); |
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if(os.startsWith("mac os x")){ |
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return getNumLevelsFromMinMagnification();
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}else{
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String msg1="Error en getNumLevels. No se ha obtenido un puntero valido a LTIImage"; |
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String msg2="La llamada nativa a getNumLevels ha devuelto un c?digo de error"; |
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return baseSimpleFunction(2,msg1,msg2); |
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} |
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} |
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/**
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* Obtiene el n?mero de niveles s partir de getMinMagnification.
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* (Funcion creada para Mac sobre Power PC por los problemas con getNumLevels)
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*/
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public int getNumLevelsFromMinMagnification()throws MrSIDException{ |
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double mag = getMinMagnification();
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double aux = getWidth() * mag;
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int cont = 0; |
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while(aux < getWidth()){
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aux *= 2;
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cont ++; |
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} |
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return cont;
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} |
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} |