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SingleNodeProgression.java
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SingleNodeProgression.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.api.store;
import java.util.Iterator;
import org.neo4j.storageengine.api.txstate.NodeState;
import org.neo4j.storageengine.api.txstate.ReadableTransactionState;
import static org.neo4j.kernel.api.StatementConstants.NO_SUCH_NODE;
public class SingleNodeProgression implements NodeProgression
{
private final ReadableTransactionState state;
private long nodeId;
public SingleNodeProgression( long nodeId, ReadableTransactionState state )
{
this.state = state;
this.nodeId = nodeId;
}
@Override
public boolean nextBatch( Batch batch )
{
if ( nodeId != NO_SUCH_NODE )
{
batch.init( nodeId, nodeId );
nodeId = NO_SUCH_NODE;
return true;
}
else
{
batch.nothing();
return false;
}
}
@Override
public Iterator<Long> addedNodes()
{
return null;
}
@Override
public boolean fetchFromTxState( long id )
{
return state != null && state.nodeIsAddedInThisTx( id );
}
@Override
public boolean fetchFromDisk( long id )
{
return state == null || !state.nodeIsDeletedInThisTx( id );
}
@Override
public NodeState nodeState( long id )
{
return state == null ? NodeState.EMPTY : state.getNodeState( id );
}
}