/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 

package org.springframework.orm.hibernate;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

import javax.sql.DataSource;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.connection.ConnectionProvider;
import net.sf.hibernate.util.JDBCExceptionReporter;

/**
 * Hibernate connection provider for local DataSource instances
 * in an application context. This provider will be used if
 * LocalSessionFactoryBean's "dataSource" property is set.
 * @author Juergen Hoeller
 * @since 11.07.2003
 * @see LocalSessionFactoryBean#setDataSource
 */
public class LocalDataSourceConnectionProvider implements ConnectionProvider {

	/**
	 * This will hold the DataSource to use for the currently configured
	 * Hibernate SessionFactory. It will be set just before initialization
	 * of the respective SessionFactory, and reset immediately afterwards.
	 */
	protected static ThreadLocal configTimeDataSourceHolder = new ThreadLocal();

	private DataSource dataSource;

	public void configure(Properties props) throws HibernateException {
		this.dataSource = (DataSource) configTimeDataSourceHolder.get();
		// absolutely needs thread-bound DataSource to initialize
		if (this.dataSource == null) {
			throw new HibernateException("No local DataSource found for configuration - dataSource property must be set on LocalSessionFactoryBean");
		}
	}

	/**
	 * Return the DataSource that this ConnectionProvider wraps.
	 */ 
	public DataSource getDataSource() {
		return dataSource;
	}

	public Connection getConnection() throws SQLException {
		try {
			return this.dataSource.getConnection();
		}
		catch (SQLException sqle) {
			JDBCExceptionReporter.logExceptions(sqle);
			throw sqle;
		}
	}

	public void closeConnection(Connection conn) throws SQLException {
		try {
			conn.close();
		}
		catch (SQLException sqle) {
			JDBCExceptionReporter.logExceptions(sqle);
			throw sqle;
		}
	}

	/**
	 * Only used in Hibernate 2.0's ConnectionProvider.
	 */
	public boolean isStatementCache() {
		return true;
	}

	public void close() {
	}

}