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NodeValueIterator.java
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NodeValueIterator.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.kernel.impl.index.schema;
import org.eclipse.collections.api.iterator.LongIterator;
import org.neo4j.collection.PrimitiveLongCollections;
import org.neo4j.collection.PrimitiveLongResourceIterator;
import org.neo4j.internal.kernel.api.IndexOrder;
import org.neo4j.internal.kernel.api.IndexQuery;
import org.neo4j.storageengine.api.schema.IndexDescriptor;
import org.neo4j.storageengine.api.schema.IndexProgressor;
import org.neo4j.values.storable.Value;
/**
* A {@link IndexProgressor} + {@link IndexProgressor.NodeValueClient} combo presented as a {@link LongIterator}.
*/
public class NodeValueIterator extends PrimitiveLongCollections.PrimitiveLongBaseIterator
implements IndexProgressor.NodeValueClient, PrimitiveLongResourceIterator
{
private boolean closed;
private IndexProgressor progressor;
@Override
protected boolean fetchNext()
{
// progressor.next() will progress underlying SeekCursor
// and feed result into this with node( long reference, Value... values )
if ( closed || !progressor.next() )
{
close();
return false;
}
return true;
}
@Override
public void initialize( IndexDescriptor descriptor,
IndexProgressor progressor,
IndexQuery[] query,
IndexOrder indexOrder,
boolean needsValues )
{
this.progressor = progressor;
}
@Override
public boolean acceptNode( long reference, Value... values )
{
return next( reference );
}
@Override
public boolean needsValues()
{
return false;
}
@Override
public void close()
{
if ( !closed )
{
closed = true;
progressor.close();
progressor = null;
}
}
}