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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.query;

import java.util.List;

import org.neo4j.graphdb.Result;
import org.neo4j.values.virtual.MapValue;

enum NoQueryEngine implements QueryExecutionEngine
{
    INSTANCE;

    @Override
    public Result executeQuery( String query, MapValue parameters, TransactionalContext context, boolean prePopulate )
    {
        throw noQueryEngine();
    }

    @Override
    public QueryExecution executeQuery( String query, MapValue parameters, TransactionalContext context,
            boolean prePopulate, QuerySubscriber subscriber )
    {
        throw noQueryEngine();
    }

    @Override
    public boolean isPeriodicCommit( String query )
    {
        throw noQueryEngine();
    }

    @Override
    public long clearQueryCaches()
    {
        throw noQueryEngine();
    }

    @Override
    public List getProvidedLanguageFunctions()
    {
        throw noQueryEngine();
    }

    private static RuntimeException noQueryEngine()
    {
        return new UnsupportedOperationException( "No query engine installed." );
    }
}