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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:       ClashMap.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2021
 * date:       02/05/2021
 */

/*
 * 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.primavera;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * Maintains a mapping of clashes and resulting renumbering
 * where we are bringing together unique ID values from two
 * different sources.
 */
class ClashMap
{
   /**
    * Adds an ID. Returns the renumbered ID is there is a clash.
    *
    * @param id original ID
    * @return renumbered ID
    */
   public Integer addID(Integer id)
   {
      if (m_set.contains(id))
      {
         while (m_set.contains(Integer.valueOf(m_next)))
         {
            ++m_next;
         }
         Integer newID = Integer.valueOf(m_next);
         m_set.add(newID);
         m_map.put(id, newID);
         id = newID;
      }
      else
      {
         m_set.add(id);
      }

      return id;
   }

   /**
    * If there has been a clash this method retrieves the renumbered version of the ID.
    * If there has been no clash, the original ID value is returned.
    *
    * @param id ID to test
    * @return renumbered ID value
    */
   public Integer getID(Integer id)
   {
      Integer result = m_map.get(id);
      return result == null ? id : result;
   }

   private int m_next = 1;
   private final Set m_set = new HashSet<>();
   private final Map m_map = new HashMap<>();
}