/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.engine.jdbc.connections.internal;

import java.sql.Connection;
import java.sql.SQLException;

import org.hibernate.engine.jdbc.connections.spi.ConnectionProvider;
import org.hibernate.service.UnknownUnwrapTypeException;

/**
 * An implementation of the {@link ConnectionProvider} interface that simply throws an exception when a connection
 * is requested, the assumption being that the application is responsible for handing the connection to use to
 * the session
 *
 * @author Gavin King
 * @author Steve Ebersole
 */
public class UserSuppliedConnectionProviderImpl implements ConnectionProvider {
	@Override
	public boolean isUnwrappableAs(Class unwrapType) {
		return ConnectionProvider.class.equals( unwrapType ) ||
				UserSuppliedConnectionProviderImpl.class.isAssignableFrom( unwrapType );
	}

	@Override
	@SuppressWarnings( {"unchecked"})
	public <T> T unwrap(Class<T> unwrapType) {
		if ( ConnectionProvider.class.equals( unwrapType ) ||
				UserSuppliedConnectionProviderImpl.class.isAssignableFrom( unwrapType ) ) {
			return (T) this;
		}
		else {
			throw new UnknownUnwrapTypeException( unwrapType );
		}
	}

	@Override
	public Connection getConnection() throws SQLException {
		throw new UnsupportedOperationException( "The application must supply JDBC connections" );
	}

	@Override
	public void closeConnection(Connection conn) throws SQLException {
		throw new UnsupportedOperationException( "The application must supply JDBC connections" );
	}

	@Override
	public boolean supportsAggressiveRelease() {
		return false;
	}
}