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ELKI - Core DBIDs API – Open-Source Data-Mining Framework with Index Acceleration

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/*
 * This file is part of ELKI:
 * Environment for Developing KDD-Applications Supported by Index-Structures
 *
 * Copyright (C) 2022
 * ELKI Development Team
 *
 * This program 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 .
 */
package elki.database.datastore;

import elki.database.ids.DBIDRef;

/**
 * Interface to map DBIDs to integer record ids for use in storage.
 * 
 * @author Erich Schubert
 * @since 0.4.0
 */
public interface DataStoreIDMap {
  /**
   * Map a DBID to an array offset.
   * 
   * @param dbid DBID
   * @return record id {@code id >= 0}
   */
  int mapDBIDToOffset(DBIDRef dbid);
}