idset.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

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package rice.p2p.commonapi;

import java.io.Serializable;
import java.util.*;

/**
 * @(#) IdSet.java Represents a set of ids.
 *
 * @version $Id: IdSet.java 2302 2005-03-11 00:58:26Z jeffh $
 * @author Alan Mislove
 * @author Peter Druschel
 */
public interface IdSet extends Serializable {

  /**
   * return the number of elements
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public int numElements();

  /**
   * add a member
   *
   * @param id the id to add
   */
  public void addId(Id id);

  /**
   * remove a member
   *
   * @param id the id to remove
   */
  public void removeId(Id id);

  /**
   * test membership
   *
   * @param id the id to test
   * @return true of id is a member, false otherwise
   */
  public boolean isMemberId(Id id);

  /**
   * return a subset of this set, consisting of the member ids in a given range
   *
   * @param range DESCRIBE THE PARAMETER
   * @return the subset
   */
  public IdSet subSet(IdRange range);

  /**
   * return an iterator over the elements of this set
   *
   * @return the interator
   */
  public Iterator getIterator();

  /**
   * return this set as an array
   *
   * @return the array
   */
  public Id[] asArray();

  /**
   * return a hash of this set
   *
   * @return the hash of this set
   */
  public byte[] hash();

  /**
   * Override clone() to make it publicly accessible
   *
   * @return A clone of this set
   */
  public Object clone();

  /**
   * Returns a new, empty IdSet of this type
   *
   * @return A new IdSet
   */
  public IdSet build();
}