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LookupFilter.java
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LookupFilter.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.impl.api;
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.Property;
import org.neo4j.kernel.impl.api.operations.EntityOperations;
import org.neo4j.kernel.impl.api.operations.EntityReadOperations;
import org.neo4j.storageengine.api.EntityType;
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, int propertyKeyId, Object value )
{
if ( isNumberOrArray( value ) )
{
return PrimitiveLongCollections.filter( indexedNodeIds,
new LookupBasedExactMatchPredicate( accessor, propertyKeyId,
value ) );
}
return indexedNodeIds;
}
/**
* used in "normal" operation
*/
public static PrimitiveLongIterator exactIndexMatches( EntityOperations operations, KernelStatement state,
PrimitiveLongIterator indexedNodeIds, int propertyKeyId, Object value )
{
if ( isNumberOrArray( value ) )
{
return PrimitiveLongCollections.filter( indexedNodeIds, new OperationsBasedExactMatchPredicate( operations,
state, propertyKeyId, value ) );
}
return indexedNodeIds;
}
public static PrimitiveLongIterator exactRangeMatches( EntityOperations operations, KernelStatement state,
PrimitiveLongIterator indexedNodeIds, int propertyKeyId,
Number lower, boolean includeLower, Number upper, boolean includeUpper )
{
return PrimitiveLongCollections.filter( indexedNodeIds, new NumericRangeMatchPredicate( operations, state,
propertyKeyId, lower, includeLower, upper, includeUpper ) );
}
private static boolean isNumberOrArray( Object value )
{
return value instanceof Number || value.getClass().isArray();
}
private static abstract class BaseExactMatchPredicate implements LongPredicate
{
private final int propertyKeyId;
private final Object value;
BaseExactMatchPredicate( int propertyKeyId, Object value )
{
this.propertyKeyId = propertyKeyId;
this.value = value;
}
@Override
public boolean test( long nodeId )
{
try
{
return nodeProperty( nodeId, propertyKeyId ).valueEquals( value );
}
catch ( EntityNotFoundException ignored )
{
return false;
}
}
abstract Property nodeProperty( long nodeId, int propertyKeyId ) throws EntityNotFoundException;
}
/**
* used by "normal" operation
*/
private static class OperationsBasedExactMatchPredicate extends BaseExactMatchPredicate
{
final EntityReadOperations readOperations;
final KernelStatement state;
OperationsBasedExactMatchPredicate( EntityReadOperations readOperations, KernelStatement state,
int propertyKeyId, Object value )
{
super( propertyKeyId, value );
this.readOperations = readOperations;
this.state = state;
}
@Override
Property nodeProperty( long nodeId, int propertyKeyId ) throws EntityNotFoundException
{
try ( Cursor<NodeItem> node = readOperations.nodeCursor( state, nodeId ) )
{
if ( node.next() )
{
Object value = node.get().getProperty( propertyKeyId );
return value == null ? Property.noNodeProperty( nodeId, propertyKeyId ) : Property.property(
propertyKeyId, value );
}
else
{
throw new EntityNotFoundException( EntityType.NODE, nodeId );
}
}
}
}
/**
* used by CC
*/
private static class LookupBasedExactMatchPredicate extends BaseExactMatchPredicate
{
final PropertyAccessor accessor;
LookupBasedExactMatchPredicate( PropertyAccessor accessor, int propertyKeyId, Object value )
{
super( propertyKeyId, value );
this.accessor = accessor;
}
@Override
Property nodeProperty( long nodeId, int propertyKeyId ) throws EntityNotFoundException
{
return accessor.getProperty( nodeId, propertyKeyId );
}
}
static class NumericRangeMatchPredicate implements LongPredicate
{
final EntityOperations readOperations;
final KernelStatement state;
final int propertyKeyId;
final Number lower;
final boolean includeLower;
final Number upper;
final boolean includeUpper;
NumericRangeMatchPredicate( EntityOperations readOperations, KernelStatement state, int propertyKeyId,
Number lower, boolean includeLower, Number upper, boolean includeUpper )
{
this.readOperations = readOperations;
this.state = state;
this.propertyKeyId = propertyKeyId;
this.lower = lower;
this.includeLower = includeLower;
this.upper = upper;
this.includeUpper = includeUpper;
}
@Override
public boolean test( long nodeId )
{
try ( Cursor<NodeItem> node = readOperations.nodeCursor( state, nodeId ) )
{
return node.next() && inRange( node.get().getProperty( propertyKeyId ) );
}
}
boolean inRange( Object value )
{
if ( value == null )
{
return false;
}
if ( !(value instanceof Number) )
{
throw new IllegalStateException( "Unable to verify range for non-numeric property " +
"value: " + value + " for property key: " + propertyKeyId );
}
Number number = (Number) value;
if ( lower != null )
{
int compare = PropertyValueComparison.COMPARE_NUMBERS.compare( number, lower );
if ( compare < 0 || !includeLower && compare == 0 )
{
return false;
}
}
if ( upper != null )
{
int compare = PropertyValueComparison.COMPARE_NUMBERS.compare( number, upper );
if ( compare > 0 || !includeUpper && compare == 0 )
{
return false;
}
}
return true;
}
}
}