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NodeInUseWithCorrectLabelsCheck.java
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NodeInUseWithCorrectLabelsCheck.java
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/*
* Copyright (c) 2002-2016 "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.consistency.checking.full;
import org.neo4j.consistency.checking.CheckerEngine;
import org.neo4j.consistency.checking.ComparativeRecordChecker;
import org.neo4j.consistency.checking.LabelChainWalker;
import org.neo4j.consistency.report.ConsistencyReport;
import org.neo4j.consistency.store.RecordAccess;
import org.neo4j.consistency.store.RecordReference;
import org.neo4j.kernel.impl.store.DynamicNodeLabels;
import org.neo4j.kernel.impl.store.NodeLabels;
import org.neo4j.kernel.impl.store.NodeLabelsField;
import org.neo4j.kernel.impl.store.record.AbstractBaseRecord;
import org.neo4j.kernel.impl.store.record.DynamicRecord;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import static java.util.Arrays.binarySearch;
import static java.util.Arrays.sort;
public class NodeInUseWithCorrectLabelsCheck
<RECORD extends AbstractBaseRecord, REPORT extends ConsistencyReport.NodeInUseWithCorrectLabelsReport>
implements ComparativeRecordChecker<RECORD, NodeRecord, REPORT>
{
private final long[] expectedLabels;
public NodeInUseWithCorrectLabelsCheck( long[] expectedLabels )
{
this.expectedLabels = expectedLabels;
}
@Override
public void checkReference( RECORD record, NodeRecord nodeRecord,
CheckerEngine<RECORD, REPORT> engine, RecordAccess records )
{
if ( nodeRecord.inUse() )
{
NodeLabels nodeLabels = NodeLabelsField.parseLabelsField( nodeRecord );
if ( nodeLabels instanceof DynamicNodeLabels )
{
DynamicNodeLabels dynamicNodeLabels = (DynamicNodeLabels) nodeLabels;
long firstRecordId = dynamicNodeLabels.getFirstDynamicRecordId();
RecordReference<DynamicRecord> firstRecordReference = records.nodeLabels( firstRecordId );
ExpectedNodeLabelsChecker expectedNodeLabelsChecker = new ExpectedNodeLabelsChecker( nodeRecord );
LabelChainWalker<RECORD,REPORT> checker = new LabelChainWalker<>( expectedNodeLabelsChecker );
engine.comparativeCheck( firstRecordReference, checker );
nodeRecord.getDynamicLabelRecords(); // I think this is empty in production
}
else
{
long[] actualLabels = nodeLabels.get( null );
REPORT report = engine.report();
validateLabelIds( nodeRecord, actualLabels, report );
}
}
else
{
engine.report().nodeNotInUse( nodeRecord );
}
}
private void validateLabelIds( NodeRecord nodeRecord, long[] actualLabels, REPORT report )
{
sort(actualLabels);
for ( long expectedLabel : expectedLabels )
{
int labelIndex = binarySearch( actualLabels, expectedLabel );
if (labelIndex < 0)
{
report.nodeDoesNotHaveExpectedLabel( nodeRecord, expectedLabel );
}
}
}
private class ExpectedNodeLabelsChecker implements
LabelChainWalker.Validator<RECORD, REPORT>
{
private final NodeRecord nodeRecord;
public ExpectedNodeLabelsChecker( NodeRecord nodeRecord )
{
this.nodeRecord = nodeRecord;
}
@Override
public void onRecordNotInUse( DynamicRecord dynamicRecord, CheckerEngine<RECORD, REPORT> engine )
{
// checked elsewhere
}
@Override
public void onRecordChainCycle( DynamicRecord record, CheckerEngine<RECORD, REPORT> engine )
{
// checked elsewhere
}
@Override
public void onWellFormedChain( long[] labelIds, CheckerEngine<RECORD, REPORT> engine, RecordAccess records )
{
validateLabelIds( nodeRecord, labelIds, engine.report() );
}
}
}