/*
* 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.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.dialect.Dialect;
import org.hibernate.exception.JDBCConnectionException;
/**
* A {@link DialectResolver} implementation which coordinates resolution by delegating to its
* registered sub-resolvers. Sub-resolvers may be registered by calling either {@link #addResolver} or
* {@link #addResolverAtFirst}.
*
* @author Tomoto Shimizu Washio
*/
public class DialectResolverSet implements DialectResolver {
private static Logger log = LoggerFactory.getLogger( DialectResolverSet.class );
private List resolvers = new ArrayList();
/**
* {@inheritDoc}
*/
public Dialect resolveDialect(DatabaseMetaData metaData) {
Iterator i = resolvers.iterator();
while ( i.hasNext() ) {
final DialectResolver resolver = ( DialectResolver ) i.next();
try {
Dialect dialect = resolver.resolveDialect( metaData );
if ( dialect != null ) {
return dialect;
}
}
catch ( JDBCConnectionException e ) {
throw e;
}
catch ( Throwable t ) {
log.info( "sub-resolver threw unexpected exception, continuing to next : " + t.getMessage() );
}
}
return null;
}
/**
* Add a resolver at the end of the underlying resolver list. The resolver added by this method is at lower
* priority than any other existing resolvers.
*
* @param resolver The resolver to add.
*/
public void addResolver(DialectResolver resolver) {
resolvers.add( resolver );
}
/**
* Add a resolver at the beginning of the underlying resolver list. The resolver added by this method is at higher
* priority than any other existing resolvers.
*
* @param resolver The resolver to add.
*/
public void addResolverAtFirst(DialectResolver resolver) {
resolvers.add( 0, resolver );
}
}