/*
* 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.persister.entity;
import org.hibernate.type.Type;
/**
* Provides the information needed to properly handle type discrimination
* in HQL queries, either by 'something.class' or 'type(something)' references.
*
* @author Steve Ebersole
*/
public interface DiscriminatorMetadata {
/**
* Get the sql fragment that is used to determine the actual discriminator value for a row.
*
* @param sqlQualificationAlias The qualification alias to append to any columns references in
* the generated fragment.
*
* @return The fragment
*/
public String getSqlFragment(String sqlQualificationAlias);
/**
* Get the type used to resolve the actual discriminator value resulting from
* {@link #getSqlFragment} back into a {@link Class} reference.
*
* @return The resolution type.
*/
public Type getResolutionType();
}