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/*******************************************************************************
* Copyright (c) 2013 University of Stuttgart.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and the Apache License 2.0 which both accompany this distribution,
* and are available at http://www.eclipse.org/legal/epl-v10.html
* and http://www.apache.org/licenses/LICENSE-2.0
*
* Contributors:
* Oliver Kopp - initial API and implementation
*******************************************************************************/
package org.eclipse.winery.common;
import java.net.URL;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;
/**
* Class to produce DocumentBuilders with a pre-loaded TOSCA XSD.
*
* In a separate class as TOSCA XSD loading takes a few seconds
*/
public class TOSCADocumentBuilderFactory {
private static final Logger logger = LoggerFactory.getLogger(TOSCADocumentBuilderFactory.class);
public static final TOSCADocumentBuilderFactory INSTANCE = new TOSCADocumentBuilderFactory();
private final DocumentBuilderFactory factory;
public TOSCADocumentBuilderFactory() {
this.factory = DocumentBuilderFactory.newInstance();
this.factory.setNamespaceAware(true);
// we do not need DTD validation
this.factory.setValidating(false);
// we do XSD validation
SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema;
URL resource = this.getClass().getResource("/TOSCA-v1.0.xsd");
try {
// takes a few seconds to load
schema = schemaFactory.newSchema(resource);
this.factory.setSchema(schema);
} catch (SAXException e) {
// TODO: load xml.xsd in offline mode
TOSCADocumentBuilderFactory.logger.error("Schema could not be initalized", e);
TOSCADocumentBuilderFactory.logger.debug("We continue nevertheless to enable offline usage");
}
}
public DocumentBuilder getTOSCADocumentBuilder() {
DocumentBuilder db;
try {
db = this.factory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
throw new IllegalStateException("document builder could not be initalized", e);
}
return db;
}
}
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