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    1   package baseCode.common;
    2
    3   import java.util.Collection;
    4
    5   /***
    6    * An object whose distance to other objects can be measured. It is up to the implementer to determine that the two
    7    * objects being compared are of the same type.
    8    * <hr>
    9    * <p>
    10   * Copyright (c) 2004 Columbia University
    11   *
    12   * @author pavlidis
    13   * @version $Id: Distanceable.java,v 1.2 2004/08/02 15:03:43 pavlidis Exp $
    14   */
    15  public abstract class Distanceable extends Visitable {
    16
    17     /***
    18      * @param a
    19      * @return
    20      */
    21     public abstract double distanceTo( Distanceable a );
    22
    23     /***
    24      * Return a collections view of the object. The implementer has to make sure the Collection is of Distanceables.
    25      *
    26      * @return @todo not very elegant...
    27      */
    28     public abstract Collection toCollection();
    29
    30  }