/*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* 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,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package org.hibernate.search.query.collector.impl;
import java.io.IOException;
import java.util.Map;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Collector;
import org.hibernate.search.query.fieldcache.impl.FieldLoadingStrategy;
import static org.hibernate.search.util.impl.CollectionHelper.newHashMap;
/**
* This Collector uses an internal Map to store collected values from the FieldCache.
* Beware that when this map grows too much the put operation becomes a performance bottleneck,
* so for large resultsets you should use BigArrayFieldCacheCollectorImpl instead.
*
* @author Sanne Grinovero <sanne@hibernate.org> (C) 2011 Red Hat Inc.
* @see org.hibernate.search.query.collector.BigArrayFieldCacheCollectorImpl
*/
final class MapFieldCacheCollectorImpl extends FieldCacheCollector {
private final FieldLoadingStrategy collectorStrategy;
private final Map<Integer, Object> valuePerDocumentId = newHashMap();
private int currentDocBase;
public MapFieldCacheCollectorImpl(Collector delegate, FieldLoadingStrategy collectorStrategy) {
super( delegate );
this.collectorStrategy = collectorStrategy;
}
@Override
public void collect(int doc) throws IOException {
//warning when changing this method: extremely performance sensitive!
this.delegate.collect( doc );
Object collected = collectorStrategy.collect( doc );
this.valuePerDocumentId.put( currentDocBase + doc, collected );
}
@Override
public void setNextReader(IndexReader reader, int docBase) throws IOException {
this.currentDocBase = docBase;
this.collectorStrategy.loadNewCacheValues( reader );
this.delegate.setNextReader( reader, docBase );
}
public Object getValue(int docId) {
return valuePerDocumentId.get( docId );
}
}