/*

 *   SONEWS News Server

 *   see AUTHORS for the list of contributors

 *

 *   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 org.sonews.storage.impl;

import java.sql.SQLException;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import org.sonews.storage.Storage;

import org.sonews.storage.StorageBackendException;

import org.sonews.storage.StorageProvider;

/**

 *

 * @author Christian Lins

 * @since sonews/1.1

 */

public class HSQLDBProvider implements StorageProvider {

	protected static final Map<Thread, HSQLDB> instances =

			new ConcurrentHashMap<Thread, HSQLDB>();

	@Override

	public boolean isSupported(String uri) {

		return uri.startsWith("jdbc:hsqldb");

	}

	@Override

	public Storage storage(Thread thread) throws StorageBackendException {

		try {

			if (!instances.containsKey(Thread.currentThread())) {

				HSQLDB db = new HSQLDB();

				db.arise();

				instances.put(Thread.currentThread(), db);

				return db;

			} else {

				return instances.get(Thread.currentThread());

			}

		} catch (SQLException ex) {

			throw new StorageBackendException(ex);

		}

	}

}