| gvSIG desktop 1

package org.gvsig.remoteClient.gml.schemas;

import java.io.File;

import java.io.IOException;

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.remoteClient.gml.GMLTags;

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

import org.gvsig.remoteClient.gml.warnings.GMLWarningInfo;

import org.gvsig.remoteClient.gml.warnings.GMLWarningMalformed;

import org.gvsig.remoteClient.gml.warnings.GMLWarningNoSchema;

import org.gvsig.remoteClient.gml.warnings.GMLWarningNotFound;

import org.gvsig.remoteClient.utils.Utilities;

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: XMLSchemaManager.java 9729 2007-01-15 13:11:17Z csanchez $

 * $Log$

 * Revision 1.2  2007-01-15 13:11:00  csanchez

 * Sistema de Warnings y Excepciones adaptado a BasicException

 *

 * Revision 1.1  2006/12/22 11:25:04  csanchez

 * Nuevo parser GML 2.x para gml's sin esquema

 *

 * 

 * 

 * Revision 1.2  2006/08/30 10:47:36  jorpiell

 * A?adido un File.separator en lugar de unas barras que impedia que funcioanra en linux

 *

 * Revision 1.1  2006/08/10 12:00:49  jorpiell

 * Primer commit del driver de Gml

 *

 * 

 */

/**

 * This class represents a GML file header. It has 

 * methods to parses the GML file header and retrieve

 * the namespaces and the attributes. If there is an schema

 * on the GML file, it has to manage it. It has to retrieve

 * the GML file version

 * 

 * @author Jorge Piera Llodr? (piera_jor@gva.es)

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

 * 

 */

public class XMLSchemaManager {

        private File file = null;

        private String schema = null;

        private XMLSchemaParser nameSpaceParser = new XMLSchemaParser();

        private String mainTag;

        private int no_schema = 1;

        public GMLWarningInfo warnings = null;

        public XMLSchemaManager(File file) {

                super();

                this.file = file;

                this.warnings= new GMLWarningInfo();

        }

        /**

         * Reader for the GML file

         * It parses the GML header and returns the attributes

         * 

         * @param parser

         *  

         * @throws IOException 

         * @throws XmlPullParserException  

         */

        public void parse(XMLSchemaParser parser) throws XmlPullParserException, IOException{

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

                parser.nextTag();

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

                mainTag = parser.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<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(":");

                        //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 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);                

        }

        /**

         * Parses the schema location attribute

         * XML attribute that contains the schema location info

         * 

         * @param namespace

         * @param schemas

         **/

        private void parseSchemaLocation(String namespace,String schemas){

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

                StringTokenizer tokenizer = new StringTokenizer(schemas, " \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));

            }

            else

            {

                    schema = tokenizer.nextToken();

                    //It add the schemaLocation to the hashtable

                    String name = null;

                                try {

                                        name = XMLSchemasFactory.addSchemaLocation(namespace,URI,schema);

                                } 

                                catch (BaseException e) {

                                        // TODO Auto-generated catch block

                                        warnings.setElement(new GMLWarningMalformed());

                                }

                    //It parses the schema.

                    parseSchema(schema,name);

            }

        }

        }        

        /**

         * Schema to parse 

         * It Downloads the schemas and parses them

         * @param urlString

         * @param nameSpace

         */

        private void parseSchema(String urlString,String nameSpace){

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

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

                        File f = new File(urlString);

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

                                urlString = file.getParentFile().getAbsolutePath() + File.separator +  urlString;

                                f = new File(urlString);

                        }

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

                         * CALL TO THE SCHEMA PARSER   .XSD         *

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

                        try {

                                nameSpaceParser.parse(f,nameSpace);

                        } catch (IOException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(f.getName(),e));

                        } catch (XmlPullParserException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(f.getName(),e));

                        }

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

                }else{

                        URL url;

                        try {

                                        url = new URL(urlString);

                                        //Download the schema without cancel option.

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

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

                                         * CALL TO THE SCHEMA PARSER   .XSD         *

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

                                           nameSpaceParser.parse(f,nameSpace);

                        }

                        catch (MalformedURLException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(urlString,e));

                        }

                        catch (ConnectException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(urlString,e));

                        } 

                        catch (UnknownHostException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(urlString,e));

                        } 

                        catch (IOException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(urlString,e));

                        } 

                        catch (XmlPullParserException e) {

                                //We can't open the file of the schema

                                warnings.setElement(new GMLWarningNotFound(urlString,e));

                        }

                }                

        }

        /**

         * @return Returns if there are schema.

         */

        public boolean Schema() {

                if (schema==null)

                        return false;

                else

                        return true;

        }

        /**

         * @return Returns the targetNameSpace.

         */

        public String getTargetNamespace() {

                return nameSpaceParser.getTargetNamespace();

        }

        /**

         * @return Returns the version.

         * TODO: Manage the different versions

         */

        public String getVersion() {

                return nameSpaceParser.getversion();

        }

}