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LookupFilter.java
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LookupFilter.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;
import java.util.Arrays;
import java.util.function.LongPredicate;
import org.neo4j.collection.primitive.PrimitiveLongCollections;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.api.exceptions.EntityNotFoundException;
import org.neo4j.kernel.api.index.PropertyAccessor;
import org.neo4j.kernel.api.properties.DefinedProperty;
import org.neo4j.kernel.api.properties.Property;
import org.neo4j.kernel.api.schema_new.IndexQuery;
import org.neo4j.kernel.impl.api.operations.EntityOperations;
import org.neo4j.storageengine.api.NodeItem;
/**
* When looking up nodes by a property value, we have to do a two-stage check.
* The first stage is to look up the value in lucene, that will find us nodes that may have
* the correct property value.
* Then the second stage is to ensure the values actually match the value we are looking for,
* which requires us to load the actual property value and filter the result we got in the first stage.
* <p>This class defines the methods for the second stage check.<p>
*/
public class LookupFilter
{
/**
* used by the consistency checker
*/
public static PrimitiveLongIterator exactIndexMatches( PropertyAccessor accessor,
PrimitiveLongIterator indexedNodeIds, IndexQuery... predicates )
{
if ( !indexedNodeIds.hasNext() )
{
return indexedNodeIds;
}
IndexQuery[] numericPredicates =
Arrays.stream( predicates )
.filter( LookupFilter::isNumericPredicate )
.toArray( IndexQuery[]::new );
if ( numericPredicates.length > 0 )
{
LongPredicate combinedPredicate = nodeId ->
{
try
{
for ( IndexQuery predicate : numericPredicates )
{
int propertyKeyId = predicate.propertyKeyId();
Property property = accessor.getProperty( nodeId, propertyKeyId );
if ( property.isDefined() && !predicate.test( ((DefinedProperty)property).value() ) )
{
return false;
}
}
return true;
}
catch ( EntityNotFoundException ignored )
{
return false; // The node has been deleted but was still reported from the index. CC will catch
// this through other mechanism (NodeInUseWithCorrectLabelsCheck), so we can
// silently ignore here
}
};
return PrimitiveLongCollections.filter( indexedNodeIds, combinedPredicate );
}
return indexedNodeIds;
}
/**
* used in "normal" operation
*/
public static PrimitiveLongIterator exactIndexMatches( EntityOperations operations, KernelStatement state,
PrimitiveLongIterator indexedNodeIds, IndexQuery... predicates )
{
if ( !indexedNodeIds.hasNext() )
{
return indexedNodeIds;
}
IndexQuery[] numericPredicates =
Arrays.stream( predicates )
.filter( LookupFilter::isNumericPredicate )
.toArray( IndexQuery[]::new );
if ( numericPredicates.length > 0 )
{
LongPredicate combinedPredicate = nodeId ->
{
try ( Cursor<NodeItem> node = operations.nodeCursorById( state, nodeId ) )
{
NodeItem nodeItem = node.get();
for ( IndexQuery predicate : numericPredicates )
{
int propertyKeyId = predicate.propertyKeyId();
Object value = operations.nodeGetProperty( state, nodeItem, propertyKeyId );
if ( !predicate.test( value ) )
{
return false;
}
}
return true;
}
catch ( EntityNotFoundException ignored )
{
return false; // The node has been deleted but was still reported from the index. We hope that this
// is some transient problem and just ignore this index entry.
}
};
return PrimitiveLongCollections.filter( indexedNodeIds, combinedPredicate );
}
return indexedNodeIds;
}
private static boolean isNumericPredicate( IndexQuery predicate )
{
if ( predicate.type() == IndexQuery.IndexQueryType.exact )
{
IndexQuery.ExactPredicate exactPredicate = (IndexQuery.ExactPredicate) predicate;
if ( isNumberOrArray( exactPredicate.value() ) )
{
return true;
}
}
else if ( predicate.type() == IndexQuery.IndexQueryType.rangeNumeric )
{
return true;
}
return false;
}
private static boolean isNumberOrArray( Object value )
{
return value instanceof Number || value.getClass().isArray();
}
}