/*

  *   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);

 		}

 	}

 }