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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.

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/*
 * 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 .
 */
package org.neo4j.kernel.impl.index.schema;

import org.neo4j.index.internal.gbptree.Layout;
import org.neo4j.io.pagecache.PageCursor;

abstract class IndexLayout> extends Layout.Adapter
{
    // allows more control of the identifier, needed for legacy reasons for the two number layouts
    IndexLayout( boolean fixedSize, long identifier, int majorVersion, int minorVersion )
    {
        super( fixedSize, identifier, majorVersion, minorVersion );
    }

    IndexLayout( boolean fixedSize, String layoutName, int majorVersion, int minorVersion )
    {
        this( fixedSize, Layout.namedIdentifier( layoutName, NullValue.SIZE ), majorVersion, minorVersion );
    }

    @Override
    public NullValue newValue()
    {
        return NullValue.INSTANCE;
    }

    @Override
    public int valueSize( NullValue nullValue )
    {
        return NullValue.SIZE;
    }

    @Override
    public void writeValue( PageCursor cursor, NullValue nullValue )
    {
        // nothing to write
    }

    @Override
    public void readValue( PageCursor cursor, NullValue into, int valueSize )
    {
        // nothing to read
    }

    @Override
    public final int compare( KEY o1, KEY o2 )
    {
        int valueComparison = compareValue( o1, o2 );
        if ( valueComparison == 0 )
        {
            // This is a special case where we need also compare entityId to support inclusive/exclusive
            if ( o1.getCompareId() && o2.getCompareId() )
            {
                return Long.compare( o1.getEntityId(), o2.getEntityId() );
            }
        }
        return valueComparison;
    }

    int compareValue( KEY o1, KEY o2 )
    {
        return o1.compareValueTo( o2 );
    }
}