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UniqueLuceneIndexPopulator.java
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UniqueLuceneIndexPopulator.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.kernel.api.impl.schema.populator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.neo4j.collection.primitive.PrimitiveLongSet;
import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;
import org.neo4j.kernel.api.impl.schema.LuceneDocumentStructure;
import org.neo4j.kernel.api.impl.schema.LuceneSchemaIndex;
import org.neo4j.kernel.api.index.IndexDescriptor;
import org.neo4j.kernel.api.index.IndexUpdater;
import org.neo4j.kernel.api.index.NodePropertyUpdate;
import org.neo4j.kernel.api.index.PropertyAccessor;
import org.neo4j.kernel.impl.api.index.sampling.UniqueIndexSampler;
import org.neo4j.register.Register.DoubleLong;
public class UniqueLuceneIndexPopulator extends LuceneIndexPopulator
{
private final IndexDescriptor descriptor;
private final UniqueIndexSampler sampler;
public UniqueLuceneIndexPopulator(LuceneSchemaIndex index, IndexDescriptor descriptor )
{
super( index );
this.descriptor = descriptor;
this.sampler = new UniqueIndexSampler();
}
@Override
protected void flush() throws IOException
{
// no need to do anything yet.
}
@Override
protected void includeSamples( List<NodePropertyUpdate> updates )
{
sampler.increment( updates.size() );
}
@Override
public void verifyDeferredConstraints( PropertyAccessor accessor ) throws IndexEntryConflictException, IOException
{
luceneIndex.verifyUniqueness( accessor, descriptor.getPropertyKeyId() );
}
@Override
public IndexUpdater newPopulatingUpdater( final PropertyAccessor accessor ) throws IOException
{
return new IndexUpdater()
{
List<Object> updatedPropertyValues = new ArrayList<>();
@Override
public void process( NodePropertyUpdate update ) throws IOException, IndexEntryConflictException
{
long nodeId = update.getNodeId();
switch ( update.getUpdateMode() )
{
case ADDED:
sampler.increment( 1 ); // add new value
// We don't look at the "before" value, so adding and changing idempotently is done the same way.
writer.updateDocument( LuceneDocumentStructure.newTermForChangeOrRemove( nodeId ),
LuceneDocumentStructure.documentRepresentingProperty( nodeId, update.getValueAfter() ) );
updatedPropertyValues.add( update.getValueAfter() );
break;
case CHANGED:
// sampler.increment( -1 ); // remove old vale
// sampler.increment( 1 ); // add new value
// We don't look at the "before" value, so adding and changing idempotently is done the same way.
writer.updateDocument( LuceneDocumentStructure.newTermForChangeOrRemove( nodeId ),
LuceneDocumentStructure.documentRepresentingProperty( nodeId, update.getValueAfter() ) );
updatedPropertyValues.add( update.getValueAfter() );
break;
case REMOVED:
sampler.increment( -1 ); // remove old value
writer.deleteDocuments( LuceneDocumentStructure.newTermForChangeOrRemove( nodeId ) );
break;
default:
throw new IllegalStateException( "Unknown update mode " + update.getUpdateMode() );
}
}
@Override
public void close() throws IOException, IndexEntryConflictException
{
luceneIndex.verifyUniqueness( accessor, descriptor.getPropertyKeyId(), updatedPropertyValues );
}
@Override
public void remove( PrimitiveLongSet nodeIds )
{
throw new UnsupportedOperationException( "should not remove() from populating index" );
}
};
}
@Override
public long sampleResult( DoubleLong.Out result )
{
return sampler.result( result );
}
}