HaleSchemaWriter.java

/*
 * Copyright (c) 2014 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.common.schema.persist.hsd;

import java.io.IOException;
import java.io.OutputStream;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Element;

import eu.esdihumboldt.hale.common.core.io.IOProviderConfigurationException;
import eu.esdihumboldt.hale.common.core.io.ProgressIndicator;
import eu.esdihumboldt.hale.common.core.io.report.IOReport;
import eu.esdihumboldt.hale.common.core.io.report.IOReporter;
import eu.esdihumboldt.hale.common.core.io.report.impl.IOMessageImpl;
import eu.esdihumboldt.hale.common.schema.io.impl.AbstractSchemaWriter;
import eu.esdihumboldt.util.groovy.xml.NSDOMBuilder;

/**
 * Writes the HALE schema model to XML.
 * 
 * @author Simon Templer
 */
public class HaleSchemaWriter extends AbstractSchemaWriter {

	@Override
	public boolean isCancelable() {
		return false;
	}

	@Override
	protected IOReport execute(ProgressIndicator progress, IOReporter reporter)
			throws IOProviderConfigurationException, IOException {
		progress.begin("Save schema", ProgressIndicator.UNKNOWN);
		try (OutputStream out = getTarget().getOutput()) {
			// create DOM
			NSDOMBuilder builder = SchemaToXml.createBuilder();
			Element root = new SchemaToXml().schemasToXml(builder, getSchemas().getSchemas());

			// configure transformer for serialization
			Transformer transformer = TransformerFactory.newInstance().newTransformer();
			transformer.setOutputProperty(OutputKeys.METHOD, "xml"); //$NON-NLS-1$
			transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); //$NON-NLS-1$
			// TODO configurable?!
			transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //$NON-NLS-1$

			// serialize DOM
			DOMSource source = new DOMSource(root);
			StreamResult result = new StreamResult(out);
			transformer.transform(source, result);

			reporter.setSuccess(true);
		} catch (Exception e) {
			reporter.error(new IOMessageImpl(e.getMessage(), e));
			reporter.setSuccess(false);
		} finally {
			progress.end();
		}
		return reporter;
	}

	@Override
	protected String getDefaultTypeName() {
		return "HALE Schema Definition";
	}

}