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GenericLayout.java
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GenericLayout.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;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.kernel.impl.index.schema.config.IndexSpecificSpaceFillingCurveSettingsCache;
import static java.lang.String.format;
import static org.neo4j.kernel.impl.index.schema.NativeIndexKey.ENTITY_ID_SIZE;
class GenericLayout extends IndexLayout<GenericKey,NativeIndexValue>
{
private final int numberOfSlots;
private final IndexSpecificSpaceFillingCurveSettingsCache spatialSettings;
GenericLayout( int numberOfSlots, IndexSpecificSpaceFillingCurveSettingsCache spatialSettings )
{
super( "NSIL", 0, 4 );
this.numberOfSlots = numberOfSlots;
this.spatialSettings = spatialSettings;
}
@Override
public GenericKey newKey()
{
return numberOfSlots == 1
// An optimized version which has the GenericKeyState built-in w/o indirection
? new SingleGenericKey( spatialSettings )
// A version which has an indirection to GenericKeyState[]
: new CompositeGenericKey( numberOfSlots, spatialSettings );
}
@Override
public GenericKey copyKey( GenericKey key, GenericKey into )
{
into.setEntityId( key.getEntityId() );
into.setCompareId( key.getCompareId() );
into.copyValuesFrom( key );
return into;
}
@Override
public int keySize( GenericKey key )
{
return key.size();
}
@Override
public void writeKey( PageCursor cursor, GenericKey key )
{
cursor.putLong( key.getEntityId() );
key.write( cursor );
}
@Override
public void readKey( PageCursor cursor, GenericKey into, int keySize )
{
if ( keySize < ENTITY_ID_SIZE )
{
into.initializeToDummyValue();
cursor.setCursorException( format( "Failed to read CompositeGenericKey due to keySize < ENTITY_ID_SIZE, more precisely %d", keySize ) );
}
into.initialize( cursor.getLong() );
into.read( cursor, keySize );
}
@Override
public boolean fixedSize()
{
return false;
}
@Override
public void minimalSplitter( GenericKey left, GenericKey right, GenericKey into )
{
left.minimalSplitter( left, right, into );
}
IndexSpecificSpaceFillingCurveSettingsCache getSpaceFillingCurveSettings()
{
return spatialSettings;
}
}