/*
 * 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.lucene.works;

import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;

import org.hibernate.search.ProjectionConstants;
import org.hibernate.search.store.Workspace;
import org.hibernate.search.util.logging.impl.Log;

import org.hibernate.search.SearchException;
import org.hibernate.search.backend.IndexingMonitor;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.util.logging.impl.LoggerFactory;

/**
* Stateless implementation that performs a PurgeAllLuceneWork.
* @see LuceneWorkVisitor
* @see LuceneWorkDelegate
* @author Emmanuel Bernard
* @author Hardy Ferentschik
* @author John Griffin
* @author Sanne Grinovero
*/
class PurgeAllWorkDelegate implements LuceneWorkDelegate {

	private static final Log log = LoggerFactory.make();
	protected final Workspace workspace;

	PurgeAllWorkDelegate(Workspace workspace) {
		this.workspace = workspace;
	}

	public void performWork(LuceneWork work, IndexWriter writer, IndexingMonitor monitor) {
		final Class<?> entityType = work.getEntityClass();
		log.tracef( "purgeAll Lucene index using IndexWriter for type: %s", entityType );
		try {
			Term term = new Term( ProjectionConstants.OBJECT_CLASS, entityType.getName() );
			writer.deleteDocuments( term );
		}
		catch (Exception e) {
			throw new SearchException( "Unable to purge all from Lucene index: " + entityType, e );
		}
		workspace.notifyWorkApplied( work );
	}

}