/*
 * 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.test.configuration;

import java.io.IOException;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.search.CachingWrapperFilter;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.OpenBitSet;
import org.hibernate.search.annotations.Factory;
import org.hibernate.search.annotations.Key;
import org.hibernate.search.filter.FilterKey;
import org.hibernate.search.filter.StandardFilterKey;

public class SecurityFilterFactory {

	private static final long serialVersionUID = -19238668272676998L;

	private String ownerName;
	
	public void setOwnerName(String ownerName) {
		this.ownerName = ownerName;
	}
	
	@Factory
	public Filter buildSecurityFilter() {
		SecurityFilter securityFilter = new SecurityFilter(ownerName);
		return new CachingWrapperFilter(securityFilter);
	}
	
	@Key
	public FilterKey getKey() {
		StandardFilterKey key = new StandardFilterKey();
		key.addParameter(ownerName);
		return key;
	}
	
	private static final class SecurityFilter extends Filter {
		private static final long serialVersionUID = -5105989141875576599L;
		private final String ownerName;
		
		private SecurityFilter(final String ownerName) {
			this.ownerName = ownerName;
		}
		
		public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
			OpenBitSet bitSet = new OpenBitSet( reader.maxDoc() );
			TermDocs termDocs = reader.termDocs( new Term( "owner", ownerName ) );
			while ( termDocs.next() ) {
				bitSet.set( termDocs.doc() );
			}
			return bitSet;
		}
		
	}

}