| gvSIG desktop 1

package org.gvsig.xmlschema.utils;

import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import org.gvsig.xmlschema.exceptions.SchemaCreationException;

import org.gvsig.xmlschema.exceptions.TypeNotFoundException;

import org.gvsig.xmlschema.som.IXSSchema;

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

import org.w3c.dom.Document;

import org.w3c.dom.Element;

/* 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: SchemaDocumentBuilder.java 12175 2007-06-14 16:15:05Z jorpiell $

 * $Log$

 * Revision 1.1  2007-06-14 16:15:03  jorpiell

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

 *

 * Revision 1.1  2007/06/14 13:50:07  jorpiell

 * The schema jar name has been changed

 *

 * Revision 1.2  2007/06/07 14:54:13  jorpiell

 * Add the schema support

 *

 * Revision 1.1  2007/05/30 12:25:48  jorpiell

 * Add the element collection

 *

 * Revision 1.1  2007/05/28 12:38:03  jorpiell

 * Some bugs fixed

 *

 *

 */

/**

 * Singleton to create schemas

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

 */

public class SchemaDocumentBuilder {

        private static SchemaDocumentBuilder instance = null;

        private DocumentBuilder builder = null;

        /**

         * This method cretaes the singleton instance

         *

         */

        private synchronized static void createInstance() {

                if (instance == null) { 

                        instance = new SchemaDocumentBuilder();

                }

        }

        /**

         * @return the schema builder instance

         */

        public static SchemaDocumentBuilder getInstance() {

                if (instance == null){

                        createInstance();

                }

                return instance;

        }

        /**

         * Creates a new schema from a namespace

         * @param namespaceURI

         * Schema namspace

         * @return

         * A new schema

         * @throws SchemaCreationException

         */        

        public IXSSchema createXSSchema(String namespaceURI) throws SchemaCreationException {

                IXSSchema schema;

                try {

                        Document document = getBuilder().newDocument();

                        Element element = document.createElement(SchemaTags.SCHEMA_ROOT);

                        element.setAttributeNS(SchemaTags.XSD_NS_URI, 

                                        SchemaTags.XMLNS_NS + ":" + SchemaTags.XS_NS,

                                        SchemaTags.XSD_NS_URI);

                        element.setAttributeNS(SchemaTags.GML_NS_URI, 

                                        SchemaTags.XMLNS_NS + ":" + SchemaTags.GML_NS,

                                        SchemaTags.GML_NS_URI);

                        element.setAttribute(SchemaTags.TARGET_NAMESPACE,

                                        namespaceURI);

                        document.appendChild(element);

                        schema = new XSSchemaImpl(document);

                } catch (ParserConfigurationException e) {

                        throw new SchemaCreationException(e);

                } catch (TypeNotFoundException e) {

                        throw new SchemaCreationException(e);

                }

                return schema;

        }

        /**

         * Parse a schema file

         * @param is

         * XSD schema file

         * @return

         * A schema

         * @throws SchemaCreationException 

         */

        public IXSSchema parse(InputStream is) throws SchemaCreationException {

                try {

                        Document document = getBuilder().parse(is);

                        return new XSSchemaImpl(document);

                } catch (Exception e) {

                        throw new SchemaCreationException(e);

                }                

        }

        /**

         * @return the builder

         * @throws ParserConfigurationException 

         */

        private DocumentBuilder getBuilder() throws ParserConfigurationException {

                if (builder == null){

                        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); 

                        builder = factory.newDocumentBuilder();

                }

                return builder;

        }        

}