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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) 2002-2015 "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 .
 */
package org.neo4j.kernel.extension;

import org.neo4j.helpers.Service;
import org.neo4j.kernel.lifecycle.Lifecycle;

public abstract class KernelExtensionFactory extends Service
{
    protected KernelExtensionFactory( String key )
    {
        super( key );
    }

    /**
     * Return the class that contains GraphDatabaseSetting fields that define
     * the properties needed by this extension.
     *
     * @return a class or null if no settings are needed
     */
    public Class getSettingsClass()
    {
        return null;
    }
    
    /**
     * Create a new instance of this kernel extension.
     *
     * @param dependencies
     */
    public abstract Lifecycle newKernelExtension( DEPENDENCIES dependencies )
            throws Throwable;
    
    @Override
    public String toString()
    {
        return "KernelExtension:" + getClass().getSimpleName() + getKeys();
    }
}