/**

 * 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.cli;

import javax.xml.stream.XMLStreamException;

import javax.xml.stream.XMLStreamWriter;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

/**

 * Slouží k převodu právě parsovaného XML zpět na XML.

 * Určen pro testování a ladění a pro použití s neobvyklými „XML“ parsery,

 * které nečtou XML ale jiný jazyk (např. JSON, INI atd.), ale používají stejné rozhraní (SAX).

 *

 * TODO: další typy uzlů a jmenné prostory.

 *

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

 */

public class EchoContentHandler extends DefaultHandler {

	private XMLStreamWriter w;

	/**

	 * @param writer kam se bude vypisovat XML.

	 */

	public EchoContentHandler(XMLStreamWriter writer) {

		w = writer;

	}

	@Override

	public void startDocument() throws SAXException {

		try {

			w.writeStartDocument();

		} catch (XMLStreamException e) {

			throw new SAXException(e);

		}

	}

	@Override

	public void endDocument() throws SAXException {

		try {

			w.writeEndDocument();

			w.close();

		} catch (XMLStreamException e) {

			throw new SAXException(e);

		}

	}

	@Override

	public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

		try {

			w.writeStartElement(qName);

			if (attributes != null) {

				for (int i = 0; i < attributes.getLength(); i++) {

					w.writeAttribute(attributes.getQName(i), attributes.getValue(i));

				}

			}

			w.flush();

		} catch (XMLStreamException e) {

			throw new SAXException(e);

		}

	}

	@Override

	public void endElement(String uri, String localName, String qName) throws SAXException {

		try {

			w.writeEndElement();

			w.flush();

		} catch (XMLStreamException e) {

			throw new SAXException(e);

		}

	}

	@Override

	public void characters(char[] ch, int start, int length) throws SAXException {

		try {

			w.writeCharacters(ch, start, length);

			w.flush();

		} catch (XMLStreamException e) {

			throw new SAXException(e);

		}

	}

}