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/*
 * Copyright (c) 1998-2018 University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
package ucar.units;

import java.io.Serializable;

/**
 * Provides support for managing a default unit database.
 * 
 * @author Steven R. Emmerson
 */
public final class UnitDBManager implements Serializable {
  private static final long serialVersionUID = 1L;
  /**
   * The singleton instance of the default unit database.
   * 
   * @serial
   */
  private static UnitDB instance;

  /**
   * Gets the default unit database.
   * 
   * @return The default unit database.
   * @throws UnitDBException
   *         The default unit database couldn't be created.
   */
  public static synchronized UnitDB instance() throws UnitDBException {
    if (instance == null) {
      instance = StandardUnitDB.instance();
    }
    return instance;
  }

  /**
   * Sets the default unit database. You'd better know what you're doing if
   * you call this method!
   * 
   * @param instance
   *        The unit database to be made the default one.
   */
  public static synchronized void setInstance(final UnitDB instance) {
    UnitDBManager.instance = instance;
  }
}