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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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package net.sf.mpxj.mpp;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.poifs.filesystem.DocumentEntry;
import org.apache.poi.poifs.filesystem.DocumentInputStream;

import net.sf.mpxj.EventManager;
import net.sf.mpxj.ProjectFile;
import net.sf.mpxj.ProjectProperties;
import net.sf.mpxj.Relation;
import net.sf.mpxj.RelationType;
import net.sf.mpxj.Task;
import net.sf.mpxj.common.NumberHelper;

/**
 * Common implementation detail to extract task constraint data from
 * MPP9, MPP12, and MPP14 files.
 */
public class ConstraintFactory
{
   /**
    * Main entry point when called to process constraint data.
    *
    * @param projectDir project directory
    * @param file parent project file
    * @param inputStreamFactory factory to create input stream
    */
   public void process(DirectoryEntry projectDir, ProjectFile file, DocumentInputStreamFactory inputStreamFactory) throws IOException
   {
      DirectoryEntry consDir;
      try
      {
         consDir = (DirectoryEntry) projectDir.getEntry("TBkndCons");
      }

      catch (FileNotFoundException ex)
      {
         file.addIgnoredError(ex);
         consDir = null;
      }

      if (consDir != null)
      {
         FixedMeta consFixedMeta = new FixedMeta(new DocumentInputStream(((DocumentEntry) consDir.getEntry("FixedMeta"))), 10);
         FixedData consFixedData = new FixedData(consFixedMeta, 20, inputStreamFactory.getInstance(consDir, "FixedData"));
         //         FixedMeta consFixed2Meta = new FixedMeta(new DocumentInputStream(((DocumentEntry) consDir.getEntry("Fixed2Meta"))), 9);
         //         FixedData consFixed2Data = new FixedData(consFixed2Meta, 48, getEncryptableInputStream(consDir, "Fixed2Data"));

         int count = consFixedMeta.getAdjustedItemCount();
         int lastConstraintID = -1;

         ProjectProperties properties = file.getProjectProperties();
         EventManager eventManager = file.getEventManager();

         boolean project15 = NumberHelper.getInt(properties.getMppFileType()) == 14 && NumberHelper.getInt(properties.getApplicationVersion()) > ApplicationVersion.PROJECT_2010;
         int durationUnitsOffset = project15 ? 18 : 14;
         int durationOffset = project15 ? 14 : 16;

         for (int loop = 0; loop < count; loop++)
         {
            byte[] metaData = consFixedMeta.getByteArrayValue(loop);

            //
            // SourceForge bug 2209477: we were reading an int here, but
            // it looks like the deleted flag is just a short.
            //
            if (MPPUtility.getShort(metaData, 0) != 0)
            {
               continue;
            }

            int index = consFixedData.getIndexFromOffset(MPPUtility.getInt(metaData, 4));
            if (index == -1)
            {
               continue;
            }

            //
            // Do we have enough data?
            //
            byte[] data = consFixedData.getByteArrayValue(index);
            if (data.length < 14)
            {
               continue;
            }

            int constraintID = MPPUtility.getInt(data, 0);
            if (constraintID <= lastConstraintID)
            {
               continue;
            }

            lastConstraintID = constraintID;
            int taskID1 = MPPUtility.getInt(data, 4);
            int taskID2 = MPPUtility.getInt(data, 8);

            if (taskID1 == taskID2)
            {
               continue;
            }

            // byte[] metaData2 = consFixed2Meta.getByteArrayValue(loop);
            // int index2 = consFixed2Data.getIndexFromOffset(MPPUtility.getInt(metaData2, 4));
            // byte[] data2 = consFixed2Data.getByteArrayValue(index2);

            Task task1 = file.getTaskByUniqueID(Integer.valueOf(taskID1));
            Task task2 = file.getTaskByUniqueID(Integer.valueOf(taskID2));
            if (task1 != null && task2 != null)
            {
               Relation relation = task2.addPredecessor(new Relation.Builder()
                  .targetTask(task1)
                  .type(RelationType.getInstance(MPPUtility.getShort(data, 12)))
                  .lag(MPPUtility.getAdjustedDuration(properties, MPPUtility.getInt(data, durationOffset), MPPUtility.getDurationTimeUnits(MPPUtility.getShort(data, durationUnitsOffset))))
                  .uniqueID(Integer.valueOf(constraintID)));
               eventManager.fireRelationReadEvent(relation);
            }
         }
      }
   }
}