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Neo4j kernel is a lightweight, embedded Java database designed to
store data structured as graphs rather than tables. For more
information, see http://neo4j.org.
/*
* Copyright (c) "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
{
private final IndexSpecificSpaceFillingCurveSettings spaceFillingCurveSettings;
private final SpaceFillingCurveConfiguration configuration;
GenericNativeIndexReader( GBPTree tree, IndexLayout layout,
IndexDescriptor descriptor, IndexSpecificSpaceFillingCurveSettings spaceFillingCurveSettings,
SpaceFillingCurveConfiguration configuration )
{
super( tree, layout, descriptor );
this.spaceFillingCurveSettings = spaceFillingCurveSettings;
this.configuration = configuration;
}
@Override
void validateQuery( IndexQueryConstraints constraints, PropertyIndexQuery[] predicates )
{
QueryValidator.validateOrder( GenericNativeIndexProvider.CAPABILITY, constraints.order(), predicates );
QueryValidator.validateCompositeQuery( predicates );
}
@Override
public void query( QueryContext context, IndexProgressor.EntityValueClient client, IndexQueryConstraints constraints,
PropertyIndexQuery... query )
{
PropertyIndexQuery.GeometryRangePredicate geometryRangePredicate = getGeometryRangePredicateIfAny( query );
if ( geometryRangePredicate != null )
{
validateQuery( constraints, query );
try
{
// If there's a GeometryRangeQuery among the predicates then this query changes from a straight-forward: build from/to and seek...
// into a query that is split into multiple sub-queries. Predicates both before and after will have to be accompanied each sub-query.
BridgingIndexProgressor multiProgressor = new BridgingIndexProgressor( client, descriptor.schema().getPropertyIds() );
client.initialize( descriptor, multiProgressor, query, constraints, false );
double[] from = geometryRangePredicate.from() == null ? null : geometryRangePredicate.from().coordinate();
double[] to = geometryRangePredicate.to() == null ? null : geometryRangePredicate.to().coordinate();
CoordinateReferenceSystem crs = geometryRangePredicate.crs();
SpaceFillingCurve curve = spaceFillingCurveSettings.forCrs( crs );
List ranges = curve.getTilesIntersectingEnvelope( from, to, configuration );
for ( SpaceFillingCurve.LongRange range : ranges )
{
// Here's a sub-query that we'll have to do for this geometry range. Build this query from all predicates
// and when getting to the geometry range predicate that sparked these sub-query chenanigans, swap in this sub-query in its place.
GenericKey treeKeyFrom = layout.newKey();
GenericKey treeKeyTo = layout.newKey();
initializeFromToKeys( treeKeyFrom, treeKeyTo );
boolean needFiltering = initializeRangeForGeometrySubQuery( treeKeyFrom, treeKeyTo, query, crs, range );
startSeekForInitializedRange( multiProgressor, treeKeyFrom, treeKeyTo, query, constraints, needFiltering, context.cursorContext() );
}
}
catch ( IllegalArgumentException e )
{
// Invalid query ranges will cause this state (eg. min>max)
client.initialize( descriptor, IndexProgressor.EMPTY, query, constraints, false );
}
}
else
{
super.query( context, client, constraints, query );
}
}
/**
* Initializes {@code treeKeyFrom} and {@code treeKeyTo} from the {@link PropertyIndexQuery query}.
* Geometry range queries makes an otherwise straight-forward key construction complex in that a geometry range internally is performed
* by executing multiple sub-range queries to the index. Each of those sub-range queries still needs to construct the full composite key -
* in the case of a composite index. Therefore this method can be called either with null or non-null {@code crs} and {@code range} and
* constructing a key when coming across a {@link PropertyIndexQuery.GeometryRangePredicate} will use the provided crs/range instead
* of the predicate, where the specific range is one out of many sub-ranges calculated from the {@link PropertyIndexQuery.GeometryRangePredicate}
* by the caller.
*
* @param treeKeyFrom the "from" key to construct from the query.
* @param treeKeyTo the "to" key to construct from the query.
* @param query the query to construct keys from to later send to {@link GBPTree} when reading.
* @param crs {@link CoordinateReferenceSystem} for the specific {@code range}, if range is specified too.
* @param range sub-range of a larger {@link PropertyIndexQuery.GeometryRangePredicate} to use instead of {@link PropertyIndexQuery.GeometryRangePredicate}
* in the query.
* @return {@code true} if filtering is needed for the results from the reader, otherwise {@code false}.
*/
private static boolean initializeRangeForGeometrySubQuery( GenericKey treeKeyFrom, GenericKey treeKeyTo,
PropertyIndexQuery[] query, CoordinateReferenceSystem crs, SpaceFillingCurve.LongRange range )
{
boolean needsFiltering = false;
for ( int i = 0; i < query.length; i++ )
{
PropertyIndexQuery predicate = query[i];
switch ( predicate.type() )
{
case exists:
treeKeyFrom.initValueAsLowest( i, ValueGroup.UNKNOWN );
treeKeyTo.initValueAsHighest( i, ValueGroup.UNKNOWN );
break;
case exact:
ExactPredicate exactPredicate = (ExactPredicate) predicate;
treeKeyFrom.initFromValue( i, exactPredicate.value(), NEUTRAL );
treeKeyTo.initFromValue( i, exactPredicate.value(), NEUTRAL );
break;
case range:
if ( isGeometryRangeQuery( predicate ) )
{
// Use the supplied SpaceFillingCurve range instead of the GeometryRangePredicate because at the time of calling this method
// the original geometry range have been split up into multiple sub-ranges and this invocation is for one of those sub-ranges.
// We can not take query inclusion / exclusion into consideration here because then we risk missing border values. Always use
// Inclusion.LOW / HIGH respectively and filter out points later on.
treeKeyFrom.stateSlot( i ).writePointDerived( crs, range.min, LOW );
treeKeyTo.stateSlot( i ).writePointDerived( crs, range.max + 1, HIGH );
needsFiltering = true;
}
else
{
RangePredicate rangePredicate = (RangePredicate) predicate;
initFromForRange( i, rangePredicate, treeKeyFrom );
initToForRange( i, rangePredicate, treeKeyTo );
}
break;
case stringPrefix:
StringPrefixPredicate prefixPredicate = (StringPrefixPredicate) predicate;
treeKeyFrom.stateSlot( i ).initAsPrefixLow( prefixPredicate.prefix() );
treeKeyTo.stateSlot( i ).initAsPrefixHigh( prefixPredicate.prefix() );
break;
case stringSuffix:
case stringContains:
treeKeyFrom.initValueAsLowest( i, ValueGroup.TEXT );
treeKeyTo.initValueAsHighest( i, ValueGroup.TEXT );
needsFiltering = true;
break;
default:
throw new IllegalArgumentException( "IndexQuery of type " + predicate.type() + " is not supported." );
}
}
return needsFiltering;
}
@Override
boolean initializeRangeForQuery( GenericKey treeKeyFrom, GenericKey treeKeyTo, PropertyIndexQuery[] query )
{
return initializeRangeForGeometrySubQuery( treeKeyFrom, treeKeyTo, query, null, null );
}
private static void initFromForRange( int stateSlot, RangePredicate rangePredicate, GenericKey treeKeyFrom )
{
Value fromValue = rangePredicate.fromValue();
if ( fromValue == Values.NO_VALUE )
{
treeKeyFrom.initValueAsLowest( stateSlot, rangePredicate.valueGroup() );
}
else
{
treeKeyFrom.initFromValue( stateSlot, fromValue, fromInclusion( rangePredicate ) );
treeKeyFrom.setCompareId( true );
}
}
private static void initToForRange( int stateSlot, RangePredicate rangePredicate, GenericKey treeKeyTo )
{
Value toValue = rangePredicate.toValue();
if ( toValue == Values.NO_VALUE )
{
treeKeyTo.initValueAsHighest( stateSlot, rangePredicate.valueGroup() );
}
else
{
treeKeyTo.initFromValue( stateSlot, toValue, toInclusion( rangePredicate ) );
treeKeyTo.setCompareId( true );
}
}
private static NativeIndexKey.Inclusion fromInclusion( RangePredicate rangePredicate )
{
return rangePredicate.fromInclusive() ? LOW : HIGH;
}
private static NativeIndexKey.Inclusion toInclusion( RangePredicate rangePredicate )
{
return rangePredicate.toInclusive() ? HIGH : LOW;
}
private static PropertyIndexQuery.GeometryRangePredicate getGeometryRangePredicateIfAny( PropertyIndexQuery[] predicates )
{
for ( PropertyIndexQuery predicate : predicates )
{
if ( isGeometryRangeQuery( predicate ) )
{
return (PropertyIndexQuery.GeometryRangePredicate) predicate;
}
}
return null;
}
private static boolean isGeometryRangeQuery( PropertyIndexQuery predicate )
{
return predicate instanceof PropertyIndexQuery.GeometryRangePredicate;
}
}
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