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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:       PropsBlock.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2007
 * date:       07/12/2007
 */

/*
 * 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.mpp;

import java.util.Map;
import java.util.TreeMap;

/**
 * This class represents a block of property data.
 */
final class PropsBlock extends Props
{
   /**
    * Constructor.
    *
    * @param data block of property data
    */
   PropsBlock(byte[] data)
   {
      int dataSize = MPPUtility.getInt(data, 0);
      int itemCount = MPPUtility.getInt(data, 4);

      int offset = 8;
      Map offsetMap = new TreeMap<>();
      for (int loop = 0; loop < itemCount; loop++)
      {
         int itemKey = MPPUtility.getInt(data, offset);
         offset += 4;

         int itemOffset = MPPUtility.getInt(data, offset);
         offset += 4;

         offsetMap.put(Integer.valueOf(itemOffset), Integer.valueOf(itemKey));
      }

      Integer previousItemOffset = null;
      Integer previousItemKey = null;

      for (Integer itemOffset : offsetMap.keySet())
      {
         populateMap(data, previousItemOffset, previousItemKey, itemOffset);
         previousItemOffset = itemOffset;
         previousItemKey = offsetMap.get(previousItemOffset);
      }

      if (previousItemOffset != null)
      {
         Integer itemOffset = Integer.valueOf(dataSize);
         populateMap(data, previousItemOffset, previousItemKey, itemOffset);
      }
   }

   /**
    * Method used to extract data from the block of properties and
    * insert the key value pair into a map.
    *
    * @param data block of property data
    * @param previousItemOffset previous offset
    * @param previousItemKey item key
    * @param itemOffset current item offset
    */
   private void populateMap(byte[] data, Integer previousItemOffset, Integer previousItemKey, Integer itemOffset)
   {
      if (previousItemOffset != null)
      {
         int itemSize = itemOffset.intValue() - previousItemOffset.intValue();
         byte[] itemData = new byte[itemSize];
         System.arraycopy(data, previousItemOffset.intValue(), itemData, 0, itemSize);
         m_map.put(previousItemKey, itemData);
      }
   }

}