/**

 * Alt2XML

 * Copyright © 2014 František Kučera (frantovo.cz)

 *

 * 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 3 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, see <http://www.gnu.org/licenses/>.

 */

package cz.frantovo.alt2xml.out;

import javax.xml.parsers.SAXParser;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.TransformerFactoryConfigurationError;

import javax.xml.transform.dom.DOMResult;

import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

/**

 * Recommended base class for Actions based on DOM processing.

 * This actiond does not support streaming – whole document must be parsed/converted to DOM and

 * after that the action is executed.

 *

 * @author Ing. František Kučera (frantovo.cz)

 */

public abstract class AbstractDOMAction extends AbstractAction {

	public AbstractDOMAction(ActionContext actionContext) {

		super(actionContext);

	}

	@Override

	public void run(SAXParser parser, InputSource source) throws OutputActionException {

		try {

			TransformerFactory tf = TransformerFactory.newInstance();

			Transformer t = tf.newTransformer();

			DOMResult domResult = new DOMResult();

			t.transform(new SAXSource(parser.getXMLReader(), source), domResult);

			run(domResult);

		} catch (SAXException e) {

			throw new OutputActionException("Unable to get SAX reader during SAX→DOM conversion.", e);

		} catch (TransformerException | TransformerFactoryConfigurationError e) {

			throw new OutputActionException("Unable to convert SAX events to DOM using XSLT.", e);

		}

	}

	protected abstract void run(DOMResult domResult) throws OutputActionException;

}