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ConfiguredSpaceFillingCurveSettingsCache.java
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ConfiguredSpaceFillingCurveSettingsCache.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.config;
import java.util.HashMap;
import java.util.Map;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.values.storable.CoordinateReferenceSystem;
/**
* These settings affect the creation of the 2D (or 3D) to 1D mapper.
* Changing these will change the values of the 1D mapping, but this will not invalidate existing indexes. They store the settings used to create
* them, and will not use these settings at all. Changes will only affect future indexes made. In order to change existing indexes, you will need
* to drop and recreate any indexes you wish to affect.
*/
public class ConfiguredSpaceFillingCurveSettingsCache
{
private final int maxBits;
private final HashMap<CoordinateReferenceSystem,SpaceFillingCurveSettings> settings = new HashMap<>();
public ConfiguredSpaceFillingCurveSettingsCache( Config config )
{
this.maxBits = config.get( SpatialIndexSettings.space_filling_curve_max_bits );
HashMap<CoordinateReferenceSystem,EnvelopeSettings> env = EnvelopeSettings.envelopeSettingsFromConfig( config );
for ( Map.Entry<CoordinateReferenceSystem,EnvelopeSettings> entry : env.entrySet() )
{
CoordinateReferenceSystem crs = entry.getKey();
settings.put( crs, SpaceFillingCurveSettingsFactory.fromConfig( this.maxBits, entry.getValue() ) );
}
}
/**
* The space filling curve is configured up front to cover a specific region of 2D (or 3D) space,
* and the mapping tree is configured up front to have a specific maximum depth. These settings
* are stored in an instance of SpaceFillingCurveSettings and are determined by the Coordinate
* Reference System, and any neo4j.conf settings to override the CRS defaults.
*
* @return The default settings for the specified coordinate reference system
*/
public SpaceFillingCurveSettings forCRS( CoordinateReferenceSystem crs )
{
if ( settings.containsKey( crs ) )
{
return settings.get( crs );
}
else
{
return SpaceFillingCurveSettingsFactory.fromConfig( maxBits, new EnvelopeSettings( crs ) );
}
}
}