/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat, Inc. and/or its affiliates 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.search.backend.impl;
import org.hibernate.search.backend.AddLuceneWork;
import org.hibernate.search.backend.DeleteLuceneWork;
import org.hibernate.search.backend.FlushLuceneWork;
import org.hibernate.search.backend.OptimizeLuceneWork;
import org.hibernate.search.backend.PurgeAllLuceneWork;
import org.hibernate.search.backend.UpdateLuceneWork;
/**
* A visitor delegate to manipulate a LuceneWork
* needs to implement this interface.
* This pattern enables any implementation to virtually add delegate
* methods to the base LuceneWork without having to change them.
* This contract however breaks if more subclasses of LuceneWork
* are created, as a visitor must support all existing types.
*
* @author Sanne Grinovero
* @param <T> used to force a return type of choice.
*/
public interface WorkVisitor<T> {
T getDelegate(AddLuceneWork addLuceneWork);
T getDelegate(DeleteLuceneWork deleteLuceneWork);
T getDelegate(OptimizeLuceneWork optimizeLuceneWork);
T getDelegate(PurgeAllLuceneWork purgeAllLuceneWork);
T getDelegate(UpdateLuceneWork updateLuceneWork);
T getDelegate(FlushLuceneWork flushLuceneWork);
}