/**
 * Copyright (c) 2002-2011 "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 Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.test;

import java.util.Random;

import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.NotFoundException;
import org.neo4j.kernel.AbstractGraphDatabase;
import org.neo4j.kernel.impl.core.NodeManager;

public class RandomNode
{
    private static final Random random = new Random();
    private final AbstractGraphDatabase graphdb;
    private final NodeManager nm;

    public RandomNode( AbstractGraphDatabase graphdb )
    {
        this.graphdb = graphdb;
        this.nm = graphdb.getConfig().getGraphDbModule().getNodeManager();
    }

    public Node get()
    {
        Node node = null;
        do
        {
            try
            {
                node = graphdb.getNodeById( id() );
            }
            catch ( NotFoundException loop )
            {
                continue;
            }
        }
        while ( node == null );
        return node;
    }

    private long id()
    {
        return random.nextLong() % nm.getHighestPossibleIdInUse( Node.class );
    }
}