/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.service.jdbc.dialect.internal;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import org.hibernate.HibernateLogger;
import org.hibernate.JDBCException;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.resolver.BasicSQLExceptionConverter;
import org.hibernate.exception.JDBCConnectionException;
import org.hibernate.service.jdbc.dialect.spi.DialectResolver;
import org.jboss.logging.Logger;
/**
* A templated resolver impl which delegates to the {@link #resolveDialectInternal} method
* and handles any thrown {@link SQLException SQL errors}.
*
* @author Steve Ebersole
*/
public abstract class AbstractDialectResolver implements DialectResolver {
private static final HibernateLogger LOG = Logger.getMessageLogger(HibernateLogger.class,
AbstractDialectResolver.class.getName());
/**
* {@inheritDoc}
* <p/>
* Here we template the resolution, delegating to {@link #resolveDialectInternal} and handling
* {@link java.sql.SQLException}s properly.
*/
public final Dialect resolveDialect(DatabaseMetaData metaData) {
try {
return resolveDialectInternal( metaData );
}
catch ( SQLException sqlException ) {
JDBCException jdbcException = BasicSQLExceptionConverter.INSTANCE.convert( sqlException );
if (jdbcException instanceof JDBCConnectionException) throw jdbcException;
LOG.warnf("%s : %s", BasicSQLExceptionConverter.MSG, sqlException.getMessage());
return null;
}
catch ( Throwable t ) {
LOG.unableToExecuteResolver(this, t.getMessage());
return null;
}
}
/**
* Perform the actual resolution without caring about handling {@link SQLException}s.
*
* @param metaData The database metadata
* @return The resolved dialect, or null if we could not resolve.
* @throws SQLException Indicates problems accessing the metadata.
*/
protected abstract Dialect resolveDialectInternal(DatabaseMetaData metaData) throws SQLException;
}