| gvSIG desktop 1

package org.gvsig.gpe.xml.parser;

import java.io.File;

import java.io.IOException;

import java.net.URI;

import java.net.URISyntaxException;

import java.net.URL;

import java.util.StringTokenizer;

import org.gvsig.gpe.GPEDefaults;

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

import org.gvsig.gpe.parser.GPEErrorHandler;

import org.gvsig.xmlschema.exceptions.SchemaCreationException;

import org.gvsig.xmlschema.som.impl.XSSchemaDocumentImpl;

import org.gvsig.xmlschema.utils.DownloadUtilities;

import org.gvsig.xmlschema.warnings.SchemaLocationWarning;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

/* 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: GPEXmlSchemaDocument.java 157 2007-06-22 12:22:53Z jorpiell $

 * $Log$

 * Revision 1.1  2007/06/22 12:22:40  jorpiell

 * The typeNotFoundException has been deleted. It never was thrown

 *

 * Revision 1.4  2007/06/14 16:15:05  jorpiell

 * builds to create the jars generated and add the schema code to the libGPEProject

 *

 * Revision 1.3  2007/06/14 13:50:05  jorpiell

 * The schema jar name has been changed

 *

 * Revision 1.2  2007/06/08 13:01:12  jorpiell

 * Add the targetNamespace to the file

 *

 * Revision 1.1  2007/06/07 14:53:30  jorpiell

 * Add the schema support

 *

 *

 */

/**

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

 */

public class GPEXmlSchemaDocument extends XSSchemaDocumentImpl{

        private XmlPullParser parser = null;

        private URI xmlURI = null;

        private GPEErrorHandler errorHandler = null;

        public GPEXmlSchemaDocument(XmlPullParser parser, URI xmlURI, GPEErrorHandler errorHandler){

                this.parser = parser;

                this.xmlURI = xmlURI;

                this.errorHandler = errorHandler;                

        }

        /**

         * Parser the xml header

         * @throws XmlPullParserException

         * @throws IOException

         */

        public void parse() throws XmlPullParserException, IOException{

                while ((parser.getName() == null) && 

                                !(parser.getEventType() == XmlPullParser.END_DOCUMENT)){

                        parser.next();

                }

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

                        String attName = parser.getAttributeName(i);

                        String attValue = parser.getAttributeValue(i);

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

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

                        String[] ns = org.gvsig.gpe.gml.utils.StringUtils.splitString(attName,":");

                        //if is the targetNamespace declaration

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

                                setTargetNamespace(attValue);

                        }

                        //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)){

                                parseSchemaLocation(ns[0],attValue);

                        } 

                }                

        }

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

         * <parseSchemaLocation>

         * It downloads the schema's file and parse it

         * @param xmlnsName : Alias

         * @param xmlnsValue: URI 

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

        private void parseSchemaLocation(String schemaAlias, String schemaURI){

                //If the XML Schema validation is not selected 

                if (!GPEDefaults.getBooleanProperty(GPEDefaults.XML_SCHEMA_VALIDATED)){

                        return;

                }                

                //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

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

            }else{

                    String schemaLocation = tokenizer.nextToken();

                    //TODO This line must be replaced by the new downloader

                    try {

                                        URI uri = getSchemaURI(schemaLocation);                                        

                                        addSchema(uri);

                                } catch (SchemaCreationException e) {

                                        errorHandler.addError(e);

                                } catch (SchemaLocationWarning e) {

                                        errorHandler.addWarning(e);

                                }

                        }

        }

        }

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

         * <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 Uri

         * @throws SchemaLocationWarning 

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

        private URI getSchemaURI(String schemaLocation) throws SchemaLocationWarning{

                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 = new File(xmlURI).getParentFile().getAbsolutePath() + File.separator +  schemaLocation;

                                f = new File(schemaLocation);

                        }

                        try {

                                return new URI(f.getAbsolutePath());

                        } catch (URISyntaxException e) {

                                throw new SchemaLocationWarning(schemaLocation,e);

                        }                        

                }

                //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 = DownloadUtilities.downloadFile(url,"gml_schmema.xsd");        

                                return new URI(f.getAbsolutePath());

                        } catch (Exception e) {

                                throw new SchemaLocationWarning(schemaLocation,e);

                        }

                }

        }

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

         * <parseNamespace>

         * It adds an XML namespace tag to the hashtable

         * @param xmlnsName : Namespace

         * @param xmlnsValue: URI 

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

        private void parseNameSpace(String xmlnsName,String xmlnsValue){

                addNamespacePrefix(xmlnsName, xmlnsValue);        

        }

}