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Tool for checking consistency of a Neo4j data store.

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/*
 * Copyright (c) 2002-2020 "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.consistency.checking.index;

import java.util.Iterator;

import org.neo4j.helpers.collection.BoundedIterable;
import org.neo4j.kernel.api.index.IndexAccessor;

public class IndexIterator implements BoundedIterable
{
    private final IndexAccessor indexAccessor;
    private BoundedIterable indexReader;

    public IndexIterator( IndexAccessor indexAccessor )
    {
        this.indexAccessor = indexAccessor;
    }

    @Override
    public long maxCount()
    {
        try ( BoundedIterable reader = indexAccessor.newAllEntriesReader() )
        {
            return reader.maxCount();
        }
        catch ( Exception e )
        {
            throw new RuntimeException( e );
        }
    }

    @Override
    public void close() throws Exception
    {
        if ( indexReader != null )
        {
            indexReader.close();
        }
    }

    @Override
    public Iterator iterator()
    {
        if ( indexReader == null )
        {
            indexReader = indexAccessor.newAllEntriesReader();
        }

        return indexReader.iterator();
    }
}