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SpatialSchemaKey.java
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SpatialSchemaKey.java
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/*
* Copyright (c) 2002-2018 "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.index.schema;
import java.util.Arrays;
import org.neo4j.gis.spatial.index.curves.SpaceFillingCurve;
import org.neo4j.values.storable.CoordinateReferenceSystem;
import org.neo4j.values.storable.NumberValue;
import org.neo4j.values.storable.PointValue;
import org.neo4j.values.storable.Value;
import org.neo4j.values.storable.Values;
import static java.lang.String.format;
/**
* Includes value and entity id (to be able to handle non-unique values).
* A value can be any {@link PointValue} and is represented as a {@code long} to store the 1D mapped version
*/
class SpatialSchemaKey extends NativeSchemaKey
{
static final int SIZE =
Long.BYTES + /* raw value bits */
Long.BYTES; /* entityId */
long rawValueBits;
CoordinateReferenceSystem crs;
SpaceFillingCurve curve;
SpatialSchemaKey( CoordinateReferenceSystem crs, SpaceFillingCurve curve )
{
this.crs = crs;
this.curve = curve;
}
@Override
void from( Value... values )
{
extractRawBits( assertValidValue( values ) );
}
@Override
public NumberValue asValue()
{
// This is used in the index sampler to estimate value diversity. Since the spatial index does not store values
// the uniqueness of the space filling curve number is the best estimate. This can become a bad estimate for
// indexes with badly defined Envelopes for the space filling curves, such that many points exist within the
// same tile.
return (NumberValue) Values.of( rawValueBits );
}
@Override
void initValueAsLowest()
{
double[] limit = new double[crs.getDimension()];
Arrays.fill(limit, Double.NEGATIVE_INFINITY);
writePoint( limit );
}
@Override
void initValueAsHighest()
{
// These coords will generate the largest value on the spacial curve
double[] limit = new double[crs.getDimension()];
Arrays.fill(limit, Double.NEGATIVE_INFINITY);
limit[0] = Double.POSITIVE_INFINITY;
writePoint( limit );
}
public void fromDerivedValue( long entityId, long derivedValue )
{
rawValueBits = derivedValue;
setEntityId( entityId );
setCompareId( DEFAULT_COMPARE_ID );
}
/**
* This method will compare along the curve, which is not a spatial comparison, but is correct
* for comparison within the space filling index as long as the original spatial range has already
* been decomposed into a collection of 1D curve ranges before calling down into the GPTree.
*/
int compareValueTo( SpatialSchemaKey other )
{
return Long.compare( rawValueBits, other.rawValueBits );
}
private PointValue assertValidValue( Value... values )
{
// TODO: support multiple values, right?
if ( values.length > 1 )
{
throw new IllegalArgumentException( "Tried to create composite key with non-composite schema key layout" );
}
if ( values.length < 1 )
{
throw new IllegalArgumentException( "Tried to create key without value" );
}
if ( !Values.isGeometryValue( values[0] ) )
{
throw new IllegalArgumentException(
"Key layout does only support geometries, tried to create key from " + values[0] );
}
return (PointValue) values[0];
}
private void extractRawBits( PointValue value )
{
writePoint( value.coordinate() );
}
/**
* Extracts raw bits from a {@link PointValue} and store as state of this {@link SpatialSchemaKey} instance.
*/
private void writePoint( double[] coordinate )
{
rawValueBits = curve.derivedValueFor( coordinate );
}
@Override
public String toString()
{
return format( "rawValue=%d,value=%s,entityId=%d", rawValueBits, "unknown", getEntityId() );
}
}