fragmentkeyfactory.java

pastry的java实现的2.0b版

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

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

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This software is provided by RICE and the contributors on an "as is"
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********************************************************************************/
package rice.p2p.glacier;
import java.util.*;
import java.util.StringTokenizer;

import rice.environment.random.RandomSource;
import rice.p2p.commonapi.*;
import rice.p2p.multiring.MultiringIdFactory;
import rice.p2p.multiring.RingId;
import rice.pastry.Id;
import java.util.SortedMap;

/**
 * DESCRIBE THE CLASS
 *
 * @version $Id: FragmentKeyFactory.java 2693 2005-08-05 14:00:47Z jeffh $
 * @author ahae
 */
public class FragmentKeyFactory implements IdFactory {

  private MultiringIdFactory FACTORY;

  /**
   * Constructor for FragmentKeyFactory.
   *
   * @param factory DESCRIBE THE PARAMETER
   */
  public FragmentKeyFactory(MultiringIdFactory factory) {
    FACTORY = factory;
  }

  /**
   * Gets the IdToStringLength attribute of the FragmentKeyFactory object
   *
   * @return The IdToStringLength value
   */
  public int getIdToStringLength() {
    return FACTORY.getIdToStringLength() + 4;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param material DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public rice.p2p.commonapi.Id buildId(byte[] material) {
    throw new RuntimeException("FragmentKeyFactory.buildId(byte[]) is not supported!");
  }

  /**
   * Builds a protocol-specific Id given the source data.
   *
   * @param material The material to use
   * @return The built Id.
   */
  public rice.p2p.commonapi.Id buildId(int[] material) {
    throw new RuntimeException("FragmentKeyFactory.buildId(byte[]) is not supported!");
  }

  /**
   * Builds a protocol-specific Id by using the hash of the given string as
   * source data.
   *
   * @param string The string to use as source data
   * @return The built Id.
   */
  public rice.p2p.commonapi.Id buildId(String string) {
    throw new RuntimeException("FragmentKeyFactory.buildId(String) is not supported!");
  }

  /**
   * Builds a random protocol-specific Id.
   *
   * @param rng A random number generator
   * @return The built Id.
   */
  public rice.p2p.commonapi.Id buildRandomId(Random rng) {
    return new FragmentKey(new VersionKey(FACTORY.buildRandomId(rng), rng.nextLong()), rng.nextInt());
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param rng DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public rice.p2p.commonapi.Id buildRandomId(RandomSource rng) {
    return new FragmentKey(new VersionKey(FACTORY.buildRandomId(rng), rng.nextLong()), rng.nextInt());
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param string DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public rice.p2p.commonapi.Id buildIdFromToString(String string) {
    StringTokenizer stok = new StringTokenizer(string, "(,) :v#");
    if (stok.countTokens() < 4) {
      return null;
    }

    String keyRingS = stok.nextToken();
    String keyNodeS = stok.nextToken();
    String versionS = stok.nextToken();
    String fragmentIdS = stok.nextToken();
    RingId key = FACTORY.buildRingId(rice.pastry.Id.build(keyRingS), rice.pastry.Id.build(keyNodeS));

    return new FragmentKey(new VersionKey(key, Long.valueOf(versionS).longValue()), Integer.valueOf(fragmentIdS).intValue());
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param chars DESCRIBE THE PARAMETER
   * @param offset DESCRIBE THE PARAMETER
   * @param length DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public rice.p2p.commonapi.Id buildIdFromToString(char[] chars, int offset, int length) {
    return buildIdFromToString(new String(chars, offset, length));
  }

  /**
   * Builds a protocol-specific Id.Distance given the source data.
   *
   * @param material The material to use
   * @return The built Id.Distance.
   */
  public rice.p2p.commonapi.Id.Distance buildIdDistance(byte[] material) {
    throw new RuntimeException("FragmentKeyFactory.buildIdDistance() is not supported!");
  }

  /**
   * Creates an IdRange given the CW and CCW ids.
   *
   * @param cw The clockwise Id
   * @param ccw The counterclockwise Id
   * @return An IdRange with the appropriate delimiters.
   */
  public IdRange buildIdRange(rice.p2p.commonapi.Id cw, rice.p2p.commonapi.Id ccw) {
    throw new RuntimeException("FragmentKeyFactory.buildIdRange() is not supported!");
  }

  /**
   * Builds an IdRange based on a prefix. Any id which has this prefix should be
   * inside this IdRange, and any id which does not share this prefix should be
   * outside it.
   *
   * @param string The toString() representation of an Id
   * @return The built Id.
   */
  public IdRange buildIdRangeFromPrefix(String string) {
    return new FragmentKeyRange(FACTORY.buildIdRangeFromPrefix(string));
  }

  /**
   * Creates an empty IdSet.
   *
   * @return an empty IdSet
   */
  public IdSet buildIdSet() {
    return new FragmentKeySet();
  }

  /**
   * Creates an empty IdSet.
   *
   * @param map DESCRIBE THE PARAMETER
   * @return an empty IdSet
   * @Param map The map which to take the keys from to create the IdSet's
   *      elements
   */
  public IdSet buildIdSet(SortedMap map) {
    return new FragmentKeySet(map);
  }

  /**
   * Creates an empty NodeHandleSet.
   *
   * @return an empty NodeHandleSet
   */
  public NodeHandleSet buildNodeHandleSet() {
    throw new RuntimeException("FragmentKeyFactory.buildNodeHandleSet() is not supported!");
  }
}