| gvSIG desktop 1

package org.gvsig.gpe.xml.writer;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

import org.gvsig.gpe.xml.writer.Writer;

import org.apache.xml.utils.NameSpace;

import org.gvsig.gpe.GPEDefaults;

import org.gvsig.gpe.GPEErrorHandler;

import org.gvsig.gpe.writers.GPEWriterHandler;

/* 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

 */

/* CVS MESSAGES:

 *

 * $Id: GPEXmlWriterHandler.java 11380 2007-04-26 14:42:42Z jorpiell $

 * $Log$

 * Revision 1.7  2007-04-26 14:40:03  jorpiell

 * Some writer handler methods updated

 *

 * Revision 1.6  2007/04/19 07:25:49  jorpiell

 * Add the add methods to teh contenhandler and change the register mode

 *

 * Revision 1.5  2007/04/17 10:30:11  jorpiell

 * Add a method to compress a file

 *

 * Revision 1.4  2007/04/14 16:07:30  jorpiell

 * The writer has been created

 *

 * Revision 1.3  2007/04/13 07:17:57  jorpiell

 * Add the writting tests for the simple geometries

 *

 * Revision 1.2  2007/04/12 17:06:44  jorpiell

 * First GML writing tests

 *

 * Revision 1.1  2007/04/12 10:23:41  jorpiell

 * Add some writers and the GPEXml parser

 *

 *

 */

/**

 * @author Jorge Piera LLodr? (jorge.piera@iver.es)

 */

public abstract class GPEXmlWriterHandler extends GPEWriterHandler {

        protected Writer writer = null;

        private String targetNamespace = null;

        public GPEXmlWriterHandler() {

        }        

        /**

         * Writes the XML header

         * @throws IOException

         */

        protected void initXmlHeader() throws IOException{

                writer = createWriter();

                writer.write("<?xml version=\"");

                writer.write(GPEDefaults.getStringProperty(GPEDefaults.XML_VERSION).toString());

                writer.write("\" encoding=\"");

                writer.write(GPEDefaults.getStringProperty(GPEDefaults.XML_ENCODING).toString());

                writer.write("\"?>");

        }

        /**

         * Creates an input stream from a file. 

         * @param file

         * @return

         * @throws FileNotFoundException 

         * @throws FileNotFoundException 

         */

        protected abstract Writer createWriter() throws IOException;

        /**

         * Returns the selected target namespace. If

         * the namespace doesn't exists it returns the 

         * default Namespace (cit); 

         * @return the namespace

         */

        public String getNamespacePrefix() {

                if (targetNamespace == null){

                        String prefix = GPEDefaults.getStringProperty(GPEDefaults.NAMESPACE_PREFIX);

                        if (prefix != null){

                                targetNamespace = prefix + ":";

                        }else{

                                targetNamespace = "";

                        }

                }

                return targetNamespace;

        }

        /**

         * This method compress a file using the ZIP

         * compression

         */

        protected void compressFile(){

                int BUFFER_SIZE = 1024;

                int i = 0;

                boolean fileExists = true;

                File zipFile = null;

                String fileNameAux = null;

                while (fileExists){

                        fileNameAux = getOutputFile().getAbsolutePath() + i;

                        zipFile = new File(fileNameAux);

                        if (!zipFile.exists()){

                                fileExists = false;

                        }

                        i++;

                }

                try {

                        ZipOutputStream out = new ZipOutputStream(

                                        new BufferedOutputStream(

                                                        new FileOutputStream(zipFile)));

                        byte[] data = new byte[BUFFER_SIZE];

                        FileInputStream fi = new FileInputStream(getOutputFile());

                        InputStream origin = new BufferedInputStream( fi, BUFFER_SIZE );

                        ZipEntry entry = new ZipEntry(getOutputFile().getName());

                        out.putNextEntry( entry );

                        int count;

                        while(( count = origin.read(data, 0, BUFFER_SIZE ) ) != -1 ){

                                out.write(data, 0, count);

                        }

                        //Close the file

                        origin.close();

                        //Close the zip file

                        out.close();        

                        //Change the file name and delete the first

                        zipFile.renameTo(getOutputFile());

                        new File(fileNameAux).delete();

                } catch (FileNotFoundException e) {

                        //Never throwed;

                } catch (IOException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                } 

        }

}