| 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.Iterator;

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.XSElementDecl;

import com.sun.xml.xsom.XSSchema;

import com.sun.xml.xsom.XSSchemaSet;

import com.sun.xml.xsom.XSType;

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 11464 2007-05-07 07:08:02Z jorpiell $

 * $Log$

 * Revision 1.7  2007-05-07 07:06:46  jorpiell

 * Add a constructor with the name and the description fields

 *

 * Revision 1.6  2007/04/25 11:08:38  csanchez

 * Parseo correcto con XSOM de esquemas, EntityResolver para los imports

 *

 * Revision 1.5  2007/04/20 12:04:10  csanchez

 * Actualizacion protoripo libGPE, A?adidos test para el parser, parseo con XSOM

 *

 * 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 schemaFile = null;

        private int no_schema = 1;

        /*********************

         * <GPEGmlParser> 

         * Constructor Method

         *********************/

        public GPEGmlParser(String name, String description) {

                super(name, description);

        }

        /**************************************************************

         * <getFormats>

         * Returns the file extensions that are accepted to GML Parser

         * @return String[] Accepted Extensions

         **************************************************************/

        public String[] getFormats() {

                String[] formats = new String[2];

                formats[0] = "GML";

                formats[1] = "XML";

                return formats;

        }

        /************************************************************************

         * <accept>

         * Returns true if the file is a gml file and the parser has to parse it

         * @param File file

         * @return boolean 

         ************************************************************************/

        public boolean accept(File file) {

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

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

                        return true;

                }

                return false;

        }

        /**********************************************

         * <getVersions>

         * Returns the gml versions that are supported

         * @return String[] Accepted Versions

         **********************************************/

        public String[] getVersions() {

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

                return null;

        }

        /*************************************

         * <createInputStream>

         * Creates an InputStream from a file.

         * @param File file

         * @return FileInputStream

         *************************************/

        protected InputStream createInputStream(File file) throws FileNotFoundException {

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

                return new FileInputStream(file);

        }

        /****************************

         * <initParse>

         * Starts to parse the file.

         ****************************/

        protected void initParse() {

                //First, it gets the file parser.

                fileParser = getParser();

                //it has to parse the head 

                parseHead();

        }

        /************************************************************************

         * <parseHead>

         * parses the head of the gml file, it contains the URI of 

         * the remoteschema and namespaces, normally its a FeatureCollection Tag 

         ************************************************************************/

        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());

                }

        }

        /***********************************************

         * <parseSchemaLocation>

         * 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);

                            initSchemaParser();

                                try {

                                        //It parses the schema.

                                        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());

                                }

                                try {

//                                Iterator itr = schemaParser.getResult().iterateSchema();

                                        showSchemaInfo();

                                } catch (SAXException e) {

                                        // TODO Bloque catch generado autom?ticamente

                                        System.out.println("Excepci?n del parser SAX: "+e.getMessage());

                                }

            }

        }

        }

        /*******************************

         * <initSchemaParser>

         * initializes the XSOM parser

         *******************************/

        private void initSchemaParser() {

                //initialize the XSOMParser.

                if (schemaParser==null){

                        schemaParser = new XSOMParser();

                        GMLSchemaEntityResolver schemaResolver = new GMLSchemaEntityResolver();

                         // Crearemos un EntityResolver() para los imports e includes 

                         // que nos convenga almacenar localmente para un parseo r?pido

                         // o configurar una ruta local para la b?squeda por defecto.

                        schemaParser.setEntityResolver(schemaResolver);

                }

        }

        /************************************************

         * <parseNamespace>

         * 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);                

        }

        /****************************************************************************

         * <getSchemaFile>

         * 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 schema location

         * @return File local (if is a remote file then first it has to download it)

         ****************************************************************************/

        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 = getMainFile().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;        

                }

        }

        /**********************************

         * <showSchemaInfo>

         * Shows the XSSchema Information 

         **********************************/

        public void showSchemaInfo() throws SAXException{

                Iterator itr = schemaParser.getResult().iterateSchema();

                while( itr.hasNext() ) {

                          XSSchema s = (XSSchema)itr.next();

                          System.out.println("Target namespace: "+s.getTargetNamespace());

                          Iterator jtr = s.iterateElementDecls();

                          while( jtr.hasNext() ) {

                                  XSElementDecl e = (XSElementDecl)jtr.next();

                                  System.out.print("ELEMENT:" + e.getName() );

                                  if (e.getAnnotation() != null){

                                          System.out.print(" ANOTATION: " + e.getAnnotation().getAnnotation());

                                  }

                                  XSType type = e.getType();

                                  if (type.getAnnotation() != null){

                                          System.out.print(" ANOTATION TYPE: " + type.getAnnotation().getLocator().toString());

                                  }

                                  if( e.isAbstract() ){

                                          System.out.print(" (abstract)");

                                  }

                                  System.out.println();

                          }

                } 

                schemaParser.getResult().iterateSchema();

                while( itr.hasNext() ) {

                        XSSchema s = (XSSchema)itr.next();

                        System.out.println("Target namespace: "+s.getTargetNamespace());

                        Iterator jtr = s.iterateElementDecls();

                        while( jtr.hasNext() ) {

                                XSElementDecl e = (XSElementDecl)jtr.next();

                                System.out.print( e.getName() );

                                if( e.isAbstract() )

                                        System.out.print(" (abstract)");

                                System.out.println();

                        }

                }

        }

}