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ONgDB kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see https://graphfoundation.org.

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/*
 * Copyright (c) 2018-2020 "Graph Foundation,"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * This file is part of ONgDB.
 *
 * ONgDB 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 .
 */
/*
 * 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.unsafe.impl.batchimport;

import org.neo4j.kernel.impl.store.record.RelationshipGroupRecord;
import org.neo4j.unsafe.impl.batchimport.staging.BatchSender;
import org.neo4j.unsafe.impl.batchimport.staging.ProcessorStep;
import org.neo4j.unsafe.impl.batchimport.staging.StageControl;
import org.neo4j.unsafe.impl.batchimport.stats.StatsProvider;

/**
 * After this step is {@link #done()} all BOTH ID fields in the rel group cache will contain,
 * for each node, the absolute number of groups from node 0 up to this point there is.
 */
public class CountGroupsStep extends ProcessorStep
{
    private final RelationshipGroupCache cache;

    public CountGroupsStep( StageControl control, Configuration config, RelationshipGroupCache groupCache,
            StatsProvider... additionalStatsProviders )
    {
        super( control, "COUNT", config, 1, additionalStatsProviders );
        this.cache = groupCache;
    }

    @Override
    protected void process( RelationshipGroupRecord[] batch, BatchSender sender )
    {
        for ( RelationshipGroupRecord record : batch )
        {
            if ( record.inUse() )
            {
                cache.incrementGroupCount( record.getOwningNode() );
            }
        }
    }
}