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Library that provides facilities to allow project information to be manipulated in Java and .Net. Supports a range of data formats: Microsoft Project Exchange (MPX), Microsoft Project (MPP,MPT), Microsoft Project Data Interchange (MSPDI XML), Microsoft Project Database (MPD), Planner (XML), Primavera (PM XML, XER, and database), Asta Powerproject (PP, MDB), Asta Easyplan (PP), Phoenix Project Manager (PPX), FastTrack Schedule (FTS), and the Standard Data Exchange Format (SDEF).

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/*
 * file:       ObjectSequence.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2021
 * date:       2021-02-23
 */

/*
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package net.sf.mpxj.common;

/**
 * Simple sequence generation class.
 */
public final class ObjectSequence
{
   /**
    * Constructor.
    *
    * @param id initial value
    */
   public ObjectSequence(int id)
   {
      m_id = id;
   }

   /**
    * Sync the sequence with a value known to be in use.
    * If necessary, update the sequence to follow on from this value.
    *
    * @param id value in use
    */
   public void sync(Integer id)
   {
      if (id != null && id.intValue() >= m_id)
      {
         m_id = id.intValue() + 1;
      }
   }

   /**
    * Retrieve the next value from the sequence.
    *
    * @return next value
    */
   public Integer getNext()
   {
      return Integer.valueOf(m_id++);
   }

   /**
    * If the id is not null, sync the sequence with it.
    * If the id is null, generate a new id.
    *
    * @param id id value
    * @return id value
    */
   public Integer syncOrGetNext(Integer id)
   {
      if (id == null)
      {
         return getNext();
      }
      sync(id);
      return id;
   }

   private int m_id;
}