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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.impl.api;

import org.neo4j.function.Function;
import org.neo4j.graphdb.index.IndexImplementation;
import org.neo4j.kernel.impl.transaction.command.CommandHandler;

/**
 * Looks up a {@link LegacyIndexApplier} given a provider name.
 */
public interface LegacyIndexApplierLookup
{
    CommandHandler newApplier( String providerName, boolean recovery );

    /**
     * Looks up an {@link IndexImplementation} and calls {@link IndexImplementation#newApplier(boolean)} on it.
     */
    class Direct implements LegacyIndexApplierLookup
    {
        private final Function providerLookup;

        public Direct( Function providerLookup )
        {
            this.providerLookup = providerLookup;
        }

        @Override
        public CommandHandler newApplier( String providerName, boolean recovery )
        {
            return providerLookup.apply( providerName ).newApplier( recovery );
        }
    }
}