code: ///////////////////////////////////////////////////////////////////////////////
  // For information as to what this class does, see the Javadoc, below.       //
  // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
  // 2007, 2008, 2009, 2010, 2014, 2015 by Peter Spirtes, Richard Scheines, Joseph   //
  // Ramsey, and Clark Glymour.                                                //
  //                                                                           //
  // This program is free software; you can redistribute it and/or modify      //
  // it under the terms of the GNU General Public License as published by      //
  // the Free Software Foundation; either version 2 of the License, or         //
  // (at your option) any later version.                                       //
  //                                                                           //
  // This program 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 General Public License for more details.                              //
  //                                                                           //
  // You should have received a copy of the GNU General Public License         //
  // along with this program; if not, write to the Free Software               //
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA //
  ///////////////////////////////////////////////////////////////////////////////
  
  package edu.cmu.tetrad.data;
  
  import edu.cmu.tetrad.util.TetradSerializable;
  
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Specifies how a column (continuous or discrete) should be discretized. For a
   * discrete column the mapping is int[] remap; for a continuous column the
   * mapping is double[] cutoffs. The categories are the string labels for the
   * categories. This is just a small immutable class that columns can map to in
   * order to remember how discretizations were done so that the user doesn't have
   * to keep typing in information over and over again.
   *
   * @author Joseph Ramsey
   */
  public final class DiscreteDiscretizationSpec implements TetradSerializable, DiscretizationSpec {
      static final long serialVersionUID = 23L;
  
      /**
       * Discrete remapping of categories, for discrete data.
       *
       * @serial
       */
      private final int[] remap;
  
      /**
       * @serial
       */
      private final List<String> categories;
  
      //============================CONSTRUCTORS==========================//
  
      public DiscreteDiscretizationSpec(int[] remap, List<String> categories) {
          if (remap == null) {
              throw new NullPointerException();
          }
  
          if (categories == null) {
              throw new NullPointerException();
          }
  
  //        if (remap.length != categories.size()) {
  //            System.out.println("Remap length " + remap.length + " Categories = " + categories);
  //            throw new IllegalArgumentException();
  //        }
  
          this.remap = remap;
          this.categories = categories;
      }
  
      /**
       * Generates a simple exemplar of this class to test serialization.
       */
      public static DiscreteDiscretizationSpec serializableInstance() {
          return new DiscreteDiscretizationSpec(new int[0],
                  new ArrayList<String>());
      }
  
      //============================PUBLIC METHODS========================//
  
      public List<String> getCategories() {
          return categories;
      }
  
      public int[] getRemap() {
          return remap;
      }
  
      /**
       * Adds semantic checks to the default deserialization method. This method
       * must have the standard signature for a readObject method, and the body of
       * the method must begin with "s.defaultReadObject();". Other than that, any
       * semantic checks can be specified and do not need to stay the same from
       * version to version. A readObject method of this form may be added to any
       * class, even if Tetrad sessions were previously saved out using a version
       * of the class that didn't include it. (That's what the
       * "s.defaultReadObject();" is for. See J. Bloch, Effective Java, for help.
       *
       * @throws java.io.IOException
       * @throws ClassNotFoundException
       */
      private void readObject(ObjectInputStream s)
              throws IOException, ClassNotFoundException {
          s.defaultReadObject();
      }
  }
  
  
  
  
  
  