| gvSIG desktop 1

package org.gvsig.gpe.gml;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.net.ConnectException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.UnknownHostException;

import java.util.StringTokenizer;

import org.gvsig.exceptions.BaseException;

import org.gvsig.gpe.gml.factories.XMLSchemasFactory;

import org.gvsig.gpe.gml.utils.Utilities;

import org.gvsig.gpe.gml.writer.GPEGmlWriterHandler;

import org.gvsig.gpe.writers.GPEWriterHandler;

import org.gvsig.gpe.xml.GPEXmlParser;

import org.xml.sax.SAXException;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

import com.sun.xml.xsom.parser.XSOMParser;

/* 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: GPEGmlParser.java 11265 2007-04-19 11:56:03Z csanchez $

 * $Log$

 * Revision 1.4  2007-04-19 11:51:43  csanchez

 * Actualizacion protoripo libGPE

 *

 * Revision 1.1  2007/04/18 12:54:45  csanchez

 * Actualizacion protoripo libGPE

 *

 *

 */

/**

 * @author Carlos S?nchez Peri??n (sanchez_carper@gva.es)

 */

public class GPEGmlParser extends GPEXmlParser{

        private XSOMParser schemaParser = null;

        private XmlPullParser fileParser = null;

        private String mainTag = null;

        private File mainFile = null;

        private File schemaFile = null;

        private int no_schema = 1;

        public GPEGmlParser() {

                //First, it gets the file parser.

                fileParser = getParser();

                // TODO Ap?ndice de constructor generado autom?ticamente

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.gpe.GPEParser#getFormats()

         */

        public String[] getFormats() {

                String[] formats = new String[2];

                formats[0] = "GML";

                formats[1] = "XML";

                return formats;

        }

        public boolean accept(File file) {

                this.mainFile = file;

                if ((file.getName().toUpperCase().endsWith("GML"))

                                || (file.getName().toUpperCase().endsWith("XML"))) {

                        return true;

                }

                return false;

        }

        protected InputStream createInputStream(File file) throws FileNotFoundException {

                // TODO Ap?ndice de m?todo generado autom?ticamente

                return new FileInputStream(file);

        }

        /** 

         * 

         * AQUI SE IMPLEMENTA LA BASE PARA PODER PARSEAR CUALQUIER FICHERO GML:

         * -PARTIMOS DE QUE TENEMOS EL FICHERO ABIERTO EN MODO LECTURA Y UN FILE PARSER

         * -

         * -ABRIR EN MODO LECTURA CON LA CODIFICACI?N CORRECTA

         * -CREAR EL PARSER DE XML ?"XSOM"?

         * -DETECTAR FORMATO FICHERO Y VERSI?N ?"EST? REGISTRADO"?

         * -SI EXISTE, LLAMADA AL PARSER DEL FORMATO CONCRETO

         *

         **/

        protected void initParse() {

                //First of all it has to parse the head 

                parseHead();

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.gpe.GPEParser#getWriter(java.lang.String)

         */

        public GPEWriterHandler getWriter(String format) {

                return new GPEGmlWriterHandler();

        }

        public String[] getVersions() {

                // TODO Ap?ndice de m?todo generado autom?ticamente

                return null;

        }

        private void parseHead(){

                //nextTag() --> Method from KXML library to get next full tag

                try {

                        fileParser.nextTag();

                } catch (XmlPullParserException e) {

                        // TODO Bloque catch generado autom?ticamente

                        System.out.println("Error en XmlPullParser al intentar obtener la siguiente etiqueta: "+e.getMessage());

                } catch (IOException e) {

                        // TODO Bloque catch generado autom?ticamente

                        System.out.println("Error al leer la siguiente etiqueta en XmlPullParser: "+e.getMessage());

                }

                //It keeps the name of the start tag to compare with the close tag later

                mainTag = fileParser.getName();

                //If it has namespace before the ":" we keep the maintag without namespace 

                int pos = mainTag.indexOf(":");

                if (pos > 0){

                        mainTag = mainTag.substring(mainTag.indexOf(":") + 1,mainTag.length());

                }

                //It start to get all the attributes and values from the header tag

                for (int i = 0 ; i < fileParser.getAttributeCount() ; i++){

                        String attName = fileParser.getAttributeName(i);

                        String attValue = fileParser.getAttributeValue(i);

                        //it splits the attributes names at the both sides from ":"

                        String[] ns = attName.split(":");

                        //If it founds the 'xmlns' is a new namespace declaration and it has to parse it

                        if ((ns.length>1) && (ns[0].compareTo(GMLTags.XML_NAMESPACE)==0)){

                                parseNameSpace(ns[1],attValue);

                        }

                        //If its the "SCHEMA LOCATION" attribute, it means that there are schema and it tries to parse it

                        if ((ns.length>1) && (ns[1].compareTo(GMLTags.XML_SCHEMA_LOCATION)==0)){

                                no_schema=0;

                                parseSchemaLocation(ns[0],attValue);

                        }

                }

                if (no_schema==1){

                        //Alert that th GML File hasn't schema but it tries to parse

                        //warnings.setElement(new GMLWarningNoSchema());

                }

        }

        /**

         * It downloads the schema's file and parse it

         * @param xmlnsName : Alias

         * @param xmlnsValue: URI 

         */

        private void parseSchemaLocation(String schemaAlias, String schemaURI){

                //It take the name of the schemas file to open or downlad 

                StringTokenizer tokenizer = new StringTokenizer(schemaURI, " \t");

        while (tokenizer.hasMoreTokens()){

            String URI = tokenizer.nextToken();

            if (!tokenizer.hasMoreTokens()){

                            //If it hasn't the name of the schemas file or dont find it,

                            //it exits, and tries to parse without schema

                            //warnings.setElement(new GMLWarningNotFound(null,null));

                            System.out.println("Error, esquema no encontrado.PARSEO SIN ESQUEMA ");

            }

            else

            {

                            String schemaLocation = tokenizer.nextToken();

                            //It add the schemaLocation to the hashtable

                            try {

                                        XMLSchemasFactory.addSchemaLocation(schemaAlias,URI,schemaLocation);

                                } 

                                catch (BaseException e) {

                                        // TODO Auto-generated catch block

                                        //warnings.setElement(new GMLWarningMalformed());

                                        System.out.println("Error al a?adir el esquema o esquema mal formado: "+e.getMessage());

                                }

                                //It downloads the schema if it's a remote schema

                                schemaFile = getSchemaFile(schemaLocation);

                            //It parses the schema.

                                schemaParser = new XSOMParser();

                                try {

                                        schemaParser.parse(schemaFile);

                                } catch (SAXException e) {

                                        // TODO Bloque catch generado autom?ticamente

                                        System.out.println("Error al parsear el Schema: "+e.getMessage());

                                } catch (IOException e) {

                                        // TODO Bloque catch generado autom?ticamente

                                        System.out.println("Error de lectura/escritura del esquema: "+e.getMessage());

                                }

            }

        }

        }

        /**

         * It adds an XML namespace tag to the hashtable

         * @param xmlnsName : Namespace

         * @param xmlnsValue: URI 

         */

        private void parseNameSpace(String xmlnsName,String xmlnsValue){

                XMLSchemasFactory.addType(xmlnsName,xmlnsValue);                

        }

        /**

         * It downloads the schema if it's a remote schema

         * else it tries to open a local file and return if it's succesfull

         * @param String : schemaLocation

         */

        private File getSchemaFile(String schemaLocation){

                File f = null;

                //If it is a local file, it has to construct the absolute route

                if (schemaLocation.indexOf("http://") != 0){

                        f = new File(schemaLocation);

                        if (!(f.isAbsolute())){

                                schemaLocation = mainFile.getParentFile().getAbsolutePath() + File.separator +  schemaLocation;

                                f = new File(schemaLocation);

                        }

                        return f;

                }

                //Else it is an URL direction and it has to download it.

                else {

                        URL url;

                        try {

                                url = new URL(schemaLocation);

                                //Download the schema without cancel option.

                                f = Utilities.downloadFile(url,"gml_schmema.xsd");                                

                        } catch (MalformedURLException e) {

                                // TODO Bloque catch generado autom?ticamente

                                System.out.println("Error, URL del esquema mal formada: "+e.getMessage());

                        } catch (ConnectException e) {

                                // TODO Bloque catch generado autom?ticamente

                                System.out.println("Error al descargar esquema, Imposible conectar: "+e.getMessage());

                        } catch (UnknownHostException e) {

                                // TODO Bloque catch generado autom?ticamente

                                System.out.println("Error al descargar esquema, Host desconocido: "+e.getMessage());

                        } catch (IOException e) {

                                // TODO Bloque catch generado autom?ticamente

                                System.out.println("Erroral descargar esquema, Fallo de lectura/escritura: "+e.getMessage());

                        }

                        return f;        

                }

        }

}