/**
* Copyright (c) 2002-2013 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.index.impl.lucene;
import java.util.Collection;
import java.util.Iterator;
import org.neo4j.graphdb.index.IndexHits;
import org.neo4j.helpers.collection.CombiningIterator;
import org.neo4j.helpers.collection.IteratorUtil;
public class CombinedIndexHits<T> extends CombiningIterator<T> implements IndexHits<T>
{
private final Collection<IndexHits<T>> allIndexHits;
private final int size;
public CombinedIndexHits( Collection<IndexHits<T>> iterators )
{
super( iterators );
this.allIndexHits = iterators;
size = accumulatedSize( iterators );
}
private int accumulatedSize( Collection<IndexHits<T>> iterators )
{
int result = 0;
for ( IndexHits<T> hits : iterators )
{
result += hits.size();
}
return result;
}
public Iterator<T> iterator()
{
return this;
}
@Override
protected IndexHits<T> currentIterator()
{
return (IndexHits<T>) super.currentIterator();
}
public int size()
{
return size;
}
public void close()
{
for ( IndexHits<T> hits : allIndexHits )
{
hits.close();
}
allIndexHits.clear();
}
public T getSingle()
{
try
{
return IteratorUtil.singleOrNull( (Iterator<T>) this );
}
finally
{
close();
}
}
public float currentScore()
{
return currentIterator().currentScore();
}
}