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DocToIdIterator.java
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DocToIdIterator.java
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/*
* Copyright (c) 2002-2015 "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.lucene.legacy;
import org.apache.lucene.document.Document;
import java.util.Collection;
import org.neo4j.collection.primitive.PrimitiveLongSet;
import org.neo4j.graphdb.index.IndexHits;
public class DocToIdIterator extends AbstractLegacyIndexHits
{
private final Collection<EntityId> removedInTransactionState;
private final EntityId.LongCostume idCostume = new EntityId.LongCostume();
private IndexReference searcherOrNull;
private final IndexHits<Document> source;
private final PrimitiveLongSet idsModifiedInTransactionState;
public DocToIdIterator( IndexHits<Document> source, Collection<EntityId> exclude, IndexReference searcherOrNull,
PrimitiveLongSet idsModifiedInTransactionState )
{
this.source = source;
this.removedInTransactionState = exclude;
this.searcherOrNull = searcherOrNull;
this.idsModifiedInTransactionState = idsModifiedInTransactionState;
if ( source.size() == 0 )
{
close();
}
}
@Override
protected boolean fetchNext()
{
while ( source.hasNext() )
{
Document doc = source.next();
long id = idFromDoc( doc );
boolean documentIsFromStore = doc.getField( FullTxData.TX_STATE_KEY ) == null;
boolean idWillBeReturnedByTransactionStateInstead =
documentIsFromStore && idsModifiedInTransactionState.contains( id );
if ( removedInTransactionState.contains( idCostume.setId( id ) ) ||
idWillBeReturnedByTransactionStateInstead )
{
// Skip this one, continue to the next
continue;
}
return next( id );
}
return endReached();
}
static long idFromDoc( Document doc )
{
return Long.parseLong( doc.get( LuceneIndex.KEY_DOC_ID ) );
}
protected boolean endReached()
{
close();
return false;
}
@Override
public void close()
{
if ( !isClosed() )
{
this.searcherOrNull.close();
this.searcherOrNull = null;
}
}
@Override
public int size()
{
/*
* If stuff was removed from the index during this tx and during the same tx a query that matches them is
* issued, then it is possible to get negative size from the IndexHits result, if exclude is larger than source.
* To avoid such weirdness, we return at least 0. Note that the iterator will return no results, as it should.
*/
return Math.max( 0, source.size() - removedInTransactionState.size() );
}
private boolean isClosed()
{
return searcherOrNull==null;
}
@Override
public float currentScore()
{
return source.currentScore();
}
@Override
protected void finalize() throws Throwable
{
close();
super.finalize();
}
}