/**

 * 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.xpath;

import java.util.Iterator;

import javax.xml.XMLConstants;

import javax.xml.namespace.NamespaceContext;

import org.w3c.dom.Node;

/**

 *

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

 */

public class DocumentNamespaceContext implements NamespaceContext {

	private final Node document;

	public DocumentNamespaceContext(Node document) {

		this.document = document;

	}

	@Override

	public String getNamespaceURI(String prefix) {

		if (prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) {

			return document.lookupNamespaceURI(null);

		} else {

			return document.lookupNamespaceURI(prefix);

		}

	}

	@Override

	public String getPrefix(String xmlns) {

		return document.lookupPrefix(xmlns);

	}

	/**

	 * TODO: support multiple prefixes

	 */

	@Override

	public Iterator getPrefixes(String xmlns) {

		return new OneItemIterator(getPrefix(xmlns));

	}

}