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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 UnitFormat.
 * 
 * @author Steven R. Emmerson
 */
public final class UnitFormatManager implements Serializable {
  private static final long serialVersionUID = 1L;
  /**
   * The singleton instance of the default unit format.
   * 
   * @serial
   */
  private static UnitFormat instance;

  /**
   * Returns an instance of the default unit format.
   * 
   * @return An instance of the default unit format.
   */
  public static synchronized UnitFormat instance() {
    if (instance == null) {
      instance = StandardUnitFormat.instance();
    }
    return instance;
  }

  /**
   * Sets the instance of the default unit format. You'd better know what
   * you're doing if you call this method.
   * 
   * @param instance An instance of the new, default unit format.
   */
  public static synchronized void setInstance(final UnitFormat instance) {
    UnitFormatManager.instance = instance;
  }
}