/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
*
* 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.dialect.resolver;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.dialect.Dialect;
import org.hibernate.exception.JDBCConnectionException;
import org.hibernate.JDBCException;
/**
* A templated resolver impl which delegates to the {@link #resolveDialectInternal} method
* and handles any thrown {@link SQLException}s.
*
* @author Steve Ebersole
*/
public abstract class AbstractDialectResolver implements DialectResolver {
private static final Logger log = LoggerFactory.getLogger( AbstractDialectResolver.class );
/**
* {@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;
}
else {
log.warn( BasicSQLExceptionConverter.MSG + " : " + sqlException.getMessage() );
return null;
}
}
catch ( Throwable t ) {
log.warn( "Error executing resolver [" + 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;
}