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Hibernate example source code file (AbstractDialectResolver.java)

This example Hibernate source code file (AbstractDialectResolver.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

abstractdialectresolver, coremessagelogger, dialect, dialect, dialectresolver, jdbc, jdbcconnectionexception, jdbcconnectionexception, jdbcexception, jdbcexception, log, sql, sqlexception, sqlexception, throwable

The Hibernate AbstractDialectResolver.java source code

/*
 * 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.jboss.logging.Logger;

import org.hibernate.JDBCException;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.resolver.BasicSQLExceptionConverter;
import org.hibernate.exception.JDBCConnectionException;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.service.jdbc.dialect.spi.DialectResolver;

/**
 * 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 CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.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;
}

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