net.sf.mpxj.common.SlackHelper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of mpxj Show documentation

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).

There is a newer version: 13.4.0

Show newest version

/*
 * file:       SlackHelper.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2022
 * date:       2022-12-06
 */

/*
 * 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;

import net.sf.mpxj.Duration;
import net.sf.mpxj.Task;

/**
 * This class provides functionality to assist calculating slack values.
 */
public final class SlackHelper
{
   /**
    * Given a task with only a total slack value,
    * infer and set the appropriate values for start and finish slack.
    *
    * @param task target task
    */
   public static void inferSlack(Task task)
   {
      if (task.getTotalSlack() != null)
      {
         Duration startSlack;
         Duration finishSlack;
         Duration totalSlack = task.getTotalSlack();
         Duration zeroSlack = Duration.getInstance(0, totalSlack.getUnits());

         if (task.getActualFinish() == null)
         {
            finishSlack = totalSlack;
            if (task.getActualStart() == null)
            {
               startSlack = totalSlack;
            }
            else
            {
               startSlack = zeroSlack;
            }
         }
         else
         {
            startSlack = zeroSlack;
            finishSlack = zeroSlack;
            totalSlack = zeroSlack;
         }

         task.setStartSlack(startSlack);
         task.setFinishSlack(finishSlack);
         task.setTotalSlack(totalSlack);
      }
   }
}