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SecondaryUnitPrepareIdSequence.java
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SecondaryUnitPrepareIdSequence.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.unsafe.impl.batchimport.store;
import java.util.function.LongFunction;
import org.neo4j.kernel.impl.store.id.IdRange;
import org.neo4j.kernel.impl.store.id.IdSequence;
/**
* Assumes that records have been allocated such that there will be a free record, right after a given record,
* to place the secondary unit of that record.
*/
public class SecondaryUnitPrepareIdSequence implements PrepareIdSequence
{
@Override
public LongFunction<IdSequence> apply( IdSequence idSequence )
{
return new NeighbourIdSequence();
}
private static class NeighbourIdSequence implements LongFunction<IdSequence>, IdSequence
{
private long id;
private boolean returned;
@Override
public IdSequence apply( long firstUnitId )
{
this.id = firstUnitId;
returned = false;
return this;
}
@Override
public long nextId()
{
try
{
if ( returned )
{
throw new IllegalStateException( "Already returned" );
}
return id + 1;
}
finally
{
returned = true;
}
}
@Override
public IdRange nextIdBatch( int size )
{
throw new UnsupportedOperationException();
}
}
}