/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE
 * or https://OpenDS.dev.java.net/OpenDS.LICENSE.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE.  If applicable,
 * add the following below this CDDL HEADER, with the fields enclosed
 * by brackets "[]" replaced with your own identifying * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Portions Copyright 2006 Sun Microsystems, Inc.
 */
package org.opends.server.changelog;

import com.sleepycat.je.DatabaseEntry;
import org.opends.server.synchronization.AddMsg;
import org.opends.server.synchronization.DeleteMsg;
import org.opends.server.synchronization.ModifyDNMsg;
import org.opends.server.synchronization.ModifyMsg;
import org.opends.server.synchronization.UpdateMessage;

import static org.opends.server.protocols.ldap.LDAPConstants.*;

/**
 * SuperClass of DatabaseEntry used for data stored in the Changelog Databases.
 */
public class ChangelogData extends DatabaseEntry
{
  /**
   * Creates a new ChangelogData object from an UpdateMessage.
   * @param change the UpdateMessage used to create the ChangelogData.
   */
  public ChangelogData(UpdateMessage change)
  {
    this.setData(change.getByte());
  }

  /**
   * Generate an UpdateMessage from its byte[] form.
   * @param data The DatabaseEntry used to generate the UpdateMessage.
   * @return The generated change.
   * @throws Exception When the data was not a valid Update Message.
   */
  public static UpdateMessage generateChange(byte[] data)
                                             throws Exception
  {
    UpdateMessage msg = null;
    switch (data[0])
    {
      case OP_TYPE_MODIFY_REQUEST:
          msg = (UpdateMessage) new ModifyMsg(data);
      break;
      case OP_TYPE_ADD_REQUEST:
          msg = (UpdateMessage) new AddMsg(data);
      break;
      case OP_TYPE_DELETE_REQUEST:
          msg = (UpdateMessage) new DeleteMsg(data);
      break;
      case OP_TYPE_MODIFY_DN_REQUEST:
          msg = (UpdateMessage) new ModifyDNMsg(data);
      break;
    }
    return msg;
  }
}