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NumberHitIterator.java
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NumberHitIterator.java
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/*
* Copyright (c) 2002-2017 "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.kernel.impl.index.schema;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Collection;
import org.neo4j.collection.primitive.PrimitiveLongCollections;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.cursor.RawCursor;
import org.neo4j.index.internal.gbptree.Hit;
/**
* Wraps number key/value results in a {@link PrimitiveLongIterator}.
* The {@link RawCursor seeker} which gets passed in will have to be closed somewhere else because
* the {@link PrimitiveLongIterator} is just a plain iterator, no resource.
*
* @param <KEY> type of {@link SchemaNumberKey}.
* @param <VALUE> type of {@link SchemaNumberValue}.
*/
public class NumberHitIterator<KEY extends SchemaNumberKey, VALUE extends SchemaNumberValue>
extends PrimitiveLongCollections.PrimitiveLongBaseIterator
{
private final RawCursor<Hit<KEY,VALUE>,IOException> seeker;
private final Collection<RawCursor<Hit<KEY,VALUE>,IOException>> toRemoveFromWhenExhausted;
private boolean closed;
NumberHitIterator( RawCursor<Hit<KEY,VALUE>,IOException> seeker,
Collection<RawCursor<Hit<KEY,VALUE>,IOException>> toRemoveFromWhenExhausted )
{
this.seeker = seeker;
this.toRemoveFromWhenExhausted = toRemoveFromWhenExhausted;
}
@Override
protected boolean fetchNext()
{
try
{
if ( !closed && seeker.next() )
{
return next( seeker.get().key().entityId );
}
else
{
ensureCursorClosed();
return false;
}
}
catch ( IOException e )
{
throw new UncheckedIOException( e );
}
}
private void ensureCursorClosed() throws IOException
{
if ( !closed )
{
seeker.close();
toRemoveFromWhenExhausted.remove( seeker );
closed = true;
}
}
}