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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:       FieldContainerDependencies.java
 * author:     Jon Iles
 * date:       2022-09-11
 */

/*
 * 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;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 * Trivial class used to construct a list of dependencies for a calculated field.
 * This enabled the cached value for this field to be cleared when one of the
 * dependencies changes, forcing recalculation
 * when the calculated field is next referenced.
 *
 * @param 
 */
class FieldContainerDependencies
{
   /**
    * Constructor.
    *
    * @param map map to populate with the dependencies
    */
   public FieldContainerDependencies(Map> map)
   {
      m_map = map;
   }

   /**
    * Identify the target calculated field.
    *
    * @param type calculated field
    * @return this to allow method chaining
    */
   public FieldContainerDependencies calculatedField(T type)
   {
      m_currentField = type;
      return this;
   }

   /**
    * Identify one or more fields on which the calculated field depends.
    *
    * @param fields array of dependency fields
    */
   @SafeVarargs public final void dependsOn(T... fields)
   {
      Arrays.stream(fields).forEach(field -> m_map.computeIfAbsent(field, f -> new ArrayList<>()).add(m_currentField));
   }

   private T m_currentField;
   private final Map> m_map;
}