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FusionIndexReader.java
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FusionIndexReader.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.fusion;
import java.util.Arrays;
import org.neo4j.collection.PrimitiveLongResourceIterator;
import org.neo4j.graphdb.Resource;
import org.neo4j.internal.kernel.api.IndexOrder;
import org.neo4j.internal.kernel.api.IndexQuery;
import org.neo4j.internal.kernel.api.IndexQuery.ExistsPredicate;
import org.neo4j.internal.kernel.api.exceptions.schema.IndexNotApplicableKernelException;
import org.neo4j.kernel.api.schema.index.IndexDescriptor;
import org.neo4j.kernel.impl.api.schema.BridgingIndexProgressor;
import org.neo4j.storageengine.api.schema.IndexProgressor;
import org.neo4j.storageengine.api.schema.IndexReader;
import org.neo4j.storageengine.api.schema.IndexSampler;
import org.neo4j.values.storable.Value;
import static java.lang.String.format;
import static org.neo4j.collection.PrimitiveLongResourceCollections.concat;
class FusionIndexReader extends FusionIndexBase<IndexReader> implements IndexReader
{
private final IndexDescriptor descriptor;
FusionIndexReader( SlotSelector slotSelector, LazyInstanceSelector<IndexReader> instanceSelector, IndexDescriptor descriptor )
{
super( slotSelector, instanceSelector );
this.descriptor = descriptor;
}
@Override
public void close()
{
instanceSelector.close( Resource::close );
}
@Override
public long countIndexedNodes( long nodeId, Value... propertyValues )
{
return instanceSelector.select( slotSelector.selectSlot( propertyValues, GROUP_OF ) ).countIndexedNodes( nodeId, propertyValues );
}
@Override
public IndexSampler createSampler()
{
return new FusionIndexSampler( instanceSelector.transform( IndexReader::createSampler ) );
}
@Override
public PrimitiveLongResourceIterator query( IndexQuery... predicates ) throws IndexNotApplicableKernelException
{
IndexSlot slot = slotSelector.selectSlot( predicates, IndexQuery::valueGroup );
return slot != null
? instanceSelector.select( slot ).query( predicates )
: concat( instanceSelector.transform( reader -> reader.query( predicates ) ) );
}
@Override
public void query( IndexProgressor.NodeValueClient cursor, IndexOrder indexOrder, IndexQuery... predicates )
throws IndexNotApplicableKernelException
{
IndexSlot slot = slotSelector.selectSlot( predicates, IndexQuery::valueGroup );
if ( slot != null )
{
instanceSelector.select( slot ).query( cursor, indexOrder, predicates );
}
else
{
if ( indexOrder != IndexOrder.NONE )
{
throw new UnsupportedOperationException(
format( "Tried to query index with unsupported order %s. Supported orders for query %s are %s.",
indexOrder, Arrays.toString( predicates ), IndexOrder.NONE ) );
}
BridgingIndexProgressor multiProgressor = new BridgingIndexProgressor( cursor,
descriptor.schema().getPropertyIds() );
cursor.initialize( descriptor, multiProgressor, predicates );
try
{
instanceSelector.forAll( reader ->
{
try
{
reader.query( multiProgressor, indexOrder, predicates );
}
catch ( IndexNotApplicableKernelException e )
{
throw new InnerException( e );
}
} );
}
catch ( InnerException e )
{
throw e.getCause();
}
}
}
private static final class InnerException extends RuntimeException
{
private InnerException( IndexNotApplicableKernelException e )
{
super( e );
}
@Override
public synchronized IndexNotApplicableKernelException getCause()
{
return (IndexNotApplicableKernelException) super.getCause();
}
}
@Override
public boolean hasFullValuePrecision( IndexQuery... predicates )
{
IndexSlot slot = slotSelector.selectSlot( predicates, IndexQuery::valueGroup );
if ( slot != null )
{
return instanceSelector.select( slot ).hasFullValuePrecision( predicates );
}
else
{
// UNKNOWN slot which basically means the EXISTS predicate
if ( !(predicates.length == 1 && predicates[0] instanceof ExistsPredicate) )
{
throw new IllegalStateException( "Selected IndexReader null for predicates " + Arrays.toString( predicates ) );
}
return true;
}
}
}