LocalTermIdReference.java from Texai at Krugle

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/*
 * TermIdReference.java
 *
 * Created on April 23, 2007, 12:13 PM
 *
 * Description: Provides a means by which KB objects in remote partitions can reference KB objects
 * in the local partition via UUID lookup.  Primitive int's are used as local term ids in order
 * to save space and increase performance.
 *
 * Copyright (C) April 23, 2007 Stephen L. Reed.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.texai.kb.entity;

import com.sleepycat.persist.model.Entity;
import com.sleepycat.persist.model.PrimaryKey;
import com.sleepycat.persist.model.Relationship;
import com.sleepycat.persist.model.SecondaryKey;
import java.util.UUID;
import org.texai.util.ByteUtils;

/**
 *
 * @author reed
 */
@Entity
public class LocalTermIdReference {
  
  /** the local partition term ID */
  @PrimaryKey
  private int termId;                                      // NOPMD
  
  @SecondaryKey(relate=Relationship.ONE_TO_ONE)
  /** the UUID bytes which identify the term within the local KB partition */
  private byte[] uuidBytes;                                // NOPMD
  
  /** Creates a new instance of TermIdReference */
  public LocalTermIdReference() {
    super();
  }
  
  /** Creates a new instance of TermIdReference */
  public LocalTermIdReference(final int termId, final UUID uuid) {
    super();
    //Preconditions
    assert termId != 0 : "termId must not be zero";
    assert uuid != null : "uuid must not be null";
    
    this.termId = termId;
    this.uuidBytes = ByteUtils.toBytes(uuid);
  }
  
  /** Gets the local partition term ID.
   *
   * @return the local partition term ID
   */
  public int getTermId() {
    return termId;
  }
  
  /** Gets the UUID bytes which identify the term within the local KB partition.
   *
   * @return the UUID bytes which identify the term within the local KB partition
   */
  public UUID getUUID() {
    return UUID.nameUUIDFromBytes(uuidBytes);
  }
  

}
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